CN110501273B

CN110501273B - Device and method for researching penetration rule of drilling and completion fluid along well periphery stratum

Info

Publication number: CN110501273B
Application number: CN201910750979.7A
Authority: CN
Inventors: 刘天乐; 全奇; 蒋国盛; 郑少军; 李丽霞; 余尹飞
Original assignee: China University of Geosciences
Current assignee: China University of Geosciences
Priority date: 2019-08-14
Filing date: 2019-08-14
Publication date: 2024-04-16
Anticipated expiration: 2039-08-14
Also published as: CN110501273A

Abstract

The utility model provides a research well completion fluid is along device of well week stratum infiltration law, includes displacement reaction system, first intermediate container jar, second intermediate container jar, gas/liquid pressure boost injection system and waste liquid collecting system, displacement reaction system is equipped with first feed liquor end, first play liquid end and first inlet end, and it is used for placing experimental rock core, first intermediate container jar with second intermediate container jar is inside hollow cylinder structure, be equipped with first air inlet and first liquid outlet on the first intermediate container jar, be equipped with second air inlet and second liquid outlet on the second intermediate container jar, first liquid outlet with the second liquid outlet all with displacement reaction system's first feed liquor end is connected, it is used for to carry working fluid in the displacement reaction system, first intermediate container jar is used for splendid attire drilling fluid, the second intermediate container jar is used for splendid attire well completion fluid.

Description

Device and method for researching penetration rule of drilling and completion fluid along well periphery stratum

Technical Field

The invention relates to the field of oil and gas reservoir development, in particular to a device and a method for researching the permeation rule of drilling and completion fluid along a well periphery stratum.

Background

Petroleum and natural gas are clean new energy sources with huge resource potential, are widely distributed in porous media of land and continental edge submarine strata, and are favored by more and more countries in the world. However, in the process of petroleum and natural gas exploration and development, underground external working fluid often infiltrates into the surrounding stratum of the well, and reservoir damage is inevitably caused, and how to determine the rule and the damage degree of drilling and completion fluid around the well is always a difficult problem. Penetration of drilling and completion fluids in formations surrounding a well is a very complex physical process, and is also always an important point and difficulty in estimating and evaluating the damage scale of an oil and gas reservoir. Drilling and completion fluids typically occur during the entire hydrocarbon reservoir development process through the penetration of the well formations, including drilling, flushing, cementing, hydraulic fracturing, workover operations, and the like. When external fluid, especially external working fluid represented by drilling fluid, well washing fluid and well cementation cement slurry filtrate, enters the well surrounding stratum, solid phase particles easily fill part of oil gas seepage channels, so that reservoir injuries such as stratum water saturation change, permeability reduction and the like are caused. The penetration distance of the completion fluid in the formation is typically dependent upon factors such as the forward drive differential pressure between the fluid column pressure of the downhole fluid and the original formation pressure, formation parameters, fluid rheology, completion conditions, and soak time. Therefore, the penetration rule of the well drilling and completion fluid in the well surrounding stratum is researched, so that the damage range of the underground working fluid to the reservoir is predicted, the damage degree of the reservoir is further evaluated, and the method has important significance for the management and development of the oil-gas reservoir.

Penetration of downhole working fluids into natural hydrocarbon reservoirs can cause immeasurable losses to hydrocarbon production, and prior to hydrocarbon production, hydrocarbon water in the reservoir, skeletal stress of the rock and pore water pressure each maintain their own multidirectional equilibrium; when each oil and gas reservoir is drilled, the original natural stratum is destroyed along with the disturbance of the outside to the stratum and the change of the natural reservoir environment, the stress state of each point is changed along with the disturbance, and meanwhile, the liquid column pressure of drilling and completion fluid can replace the pore water pressure in the reservoir, so that the underground fluid presents the driving pressure in an over-balanced state, the liquid column pressure of the drilling and completion fluid overcomes the pore water pressure and capillary pressure, and the along-path loss occurs in the infiltration process. In the well flushing and well cementation processes, the same principle can be adopted to invade well flushing liquid and well cementation cement slurry filtrate into a well surrounding reservoir, the penetration of drilling and completion liquid can cause great damage to a well Zhou Chuceng, tiny particles in fluid can block micropores and microcracks in the reservoir, the porosity and the permeability of the reservoir are reduced, meanwhile, the fluid invaded into the well Zhou Chu can cause damage to stratum such as emulsification, water blockage, clay expansion and migration, and the like, part of oil gas overflow seepage channels are blocked, the oil gas recovery ratio is greatly reduced, and the later perforation and completion operation and oil gas exploitation are greatly influenced. Thus, there is a need to investigate in depth the penetration patterns of downhole completion fluids along the reservoir near the circumference of the well and the extent of damage to the reservoir pores and micro-cracks, as well as the effects of liquids on later hydrocarbon seepage after invasion into the reservoir, to determine the extent of invasion of the foreign fluids. So as to reasonably select the drilling process, optimize the well washing scheme, determine the dosage of the well cementation cement paste and the like before construction, thereby realizing safe and efficient development of oil and gas resources.

Disclosure of Invention

In view of this, the present invention provides an apparatus and method for studying the penetration law of drilling and completion fluids along a well periphery.

The invention provides a device for researching the penetration rule of well completion fluid along a well stratum, which comprises a displacement reaction system, a first intermediate container tank, a second intermediate container tank, a gas/liquid pressurizing injection system and a waste liquid collecting system, wherein the displacement reaction system is provided with a first liquid inlet end, a first liquid outlet end and a first air inlet end which are used for placing a test rock core, the first intermediate container tank and the second intermediate container tank are of hollow cylindrical structures, a first air inlet and a first liquid outlet are arranged on the first intermediate container tank, a second air inlet and a second liquid outlet are arranged on the second intermediate container tank, the first liquid outlet and the second liquid outlet are connected with the first liquid inlet end of the displacement reaction system, the first intermediate container tank is used for containing drilling fluid, the gas/liquid pressurizing injection system is respectively connected with the first air inlet end of the displacement reaction system, the first intermediate container and the first air inlet end of the first intermediate container tank, the second air inlet of the second intermediate container tank is used for producing waste liquid to the displacement reaction system, and the waste liquid collecting system is arranged in the first intermediate container system, and the waste liquid collecting system is arranged in the displacement reaction system.

Further, the gas/liquid booster injection system comprises a gas storage bottle, a gas booster pump, an air compressor, a first gas storage tank and a second gas storage tank, wherein the gas storage bottle is respectively connected with the air compressor and the gas booster pump through a first conveying pipeline, a first pressure regulating valve and a first barometer are arranged on the first conveying pipeline, a third air inlet and a third air outlet are arranged on the first gas storage tank, a fourth air inlet and a fifth air outlet are arranged on the second gas storage tank, the third air inlet and the fourth air inlet are respectively connected with the gas booster pump, the third air outlet is respectively connected with the first air inlet and the second air inlet through a second main pipeline, a second pressure regulating valve and a second barometer are arranged on the second main pipeline, a first liquid outlet end of the displacement reaction system is connected with the second main pipeline through a third main pipeline, and a second safety valve and a third barometer are arranged on the third main pipeline.

Further, the displacement reaction system comprises a core holder and a visual pressurizing cabin, wherein the core holder and the visual pressurizing cabin are all used for loading a test core, the core holder is provided with a second liquid inlet end, a second liquid outlet end and a second air inlet end, the visual pressurizing cabin is provided with a third liquid inlet end, a third liquid outlet end and a third air inlet end, the second liquid inlet end and the third liquid inlet end are respectively communicated with the first air inlet and the second air inlet through a first main pipeline, the first main pipeline is provided with a hydraulic gauge and a flowmeter, the second liquid outlet end and the third liquid outlet end are communicated with the third main pipeline and the waste liquid collecting system through a fifth main pipeline, the second air inlet end and the third air inlet end are respectively communicated with a fourth main pipeline, and the second air inlet end and the third air inlet end are respectively provided with a third pressure regulating valve and a fourth barometer.

Further, the core holder includes shell, ring pressure section of thick bamboo and first electric heating jacket, the shell is inside hollow rectangle structure, ring pressure section of thick bamboo level sets up in the shell, be equipped with on the shell with the second through-hole that the axle core hole of ring pressure section of thick bamboo matches, the second through-hole with the axle core hole of ring pressure section of thick bamboo all coaxial setting and intercommunication, second through-hole department detachable installs the end cap device, end cap device with close and open corresponding second through-hole, every all be equipped with on the end cap device with the inside connecting channel of intercommunication of ring pressure section of thick bamboo, first trunk line with one of them connecting channel intercommunication of end cap device, the fifth trunk line with another connecting channel intercommunication of end cap device, be equipped with the ring pressure entry on the periphery of ring pressure section of thick bamboo, the ring pressure entry with the fourth trunk line is connected, first electric heating jacket parcel is in the periphery of ring pressure section of thick bamboo, the shell is filled with first heat preservation piece.

Further, the plug device comprises a plug and a plug bolt, a plug nut matched with the plug bolt is coaxially arranged at the second through hole, the plug bolt is installed in the corresponding plug nut in a threaded mode, third through holes are coaxially formed in the plug bolt, the third through holes, the second through holes and the shaft core holes of the annular pressing cylinder are coaxially arranged and communicated, the plug is coaxially arranged between the annular pressing cylinder and the plug bolt, one end of the plug is abutted to the annular pressing cylinder, the other end of the plug is abutted to the threaded end of the plug bolt, a cylindrical first groove communicated with the third through holes is coaxially formed in one end of the plug close to the plug bolt, and a fourth through hole communicated with the inner portion of the annular pressing cylinder and the corresponding third through hole are formed in the bottom wall of the first groove.

Further, the ring presses section of thick bamboo to constitute by urceolus and gum sleeve, the urceolus level sets up, the gum sleeve coaxial arrangement is in the urceolus, its both ends respectively with the corresponding both ends parallel and level of urceolus is connected, the urceolus with form the ring between the gum sleeve and press the chamber, first electric heating cover parcel is in on the urceolus, the upper end of shell is equipped with the second breach, and be equipped with transparent glass in the second breach, the second breach with first breach is located same straight line, be equipped with first breach on the first electric heating cover, be equipped with respectively on the periphery of urceolus the ring presses the entry with the export is pressed to the ring, the ring presses the entry all with the ring presses the chamber intercommunication.

Further, the outer cylinder and the rubber sleeve are both made of transparent materials.

Further, the visual pressurizing cabin comprises a cabin body, a reaction seat, a glass chip, a cover body and a second electric heating sleeve, wherein the cabin body is of a vertically arranged cylinder structure, the inside of the cabin body is hollow, a base is arranged at the lower end of the cabin body, a cylindrical third groove is coaxially formed at the upper end of the cabin body, the second electric heating sleeve is arranged in the third groove, the reaction seat is positioned in the cylinder structure matched with the third groove, the reaction seat is vertically arranged in the third groove, the lower end of the reaction seat extends into the second electric heating sleeve, the upper end of the reaction seat extends out of the third groove, a cylindrical fourth groove is coaxially formed at the upper end of the reaction seat, the glass chip is arranged in the fourth groove, the cover body is arranged at the upper end of the reaction seat and is detachably connected with the reaction seat, a third notch is formed at the upper end of the cover body, transparent glass is arranged in the third notch, the lower end of the cabin body is respectively provided with the third groove, the first working liquid inlet, the second working liquid inlet, the working liquid inlet and the working liquid outlet are respectively communicated with the first working liquid inlet, the working liquid outlet are communicated with the first working liquid inlet, the working liquid outlet and the working liquid inlet are communicated with the working liquid inlet and the working liquid outlet, the working liquid inlet is communicated with the working liquid inlet, the fourth main pipeline is communicated with the confining pressure inlet channel, and a second heat preservation piece is filled in the cabin body.

Further, the glass chip fixing device further comprises a chip pressing plate, a seventh groove is formed in the bottom wall of the fourth groove, the second working solution inlet, the second working solution outlet and the second confining pressure inlet are communicated with the seventh groove, O-shaped rings are arranged at positions of the seventh groove corresponding to the second working solution inlet and the second working solution outlet, the glass chip is horizontally arranged on the O-shaped rings, the chip pressing plate is arranged in the fourth groove and is detachably connected with the bottom wall of the fourth groove, two threaded through holes are formed in the chip pressing plate, second bolts are installed in each threaded through hole in a threaded mode, and the threaded ends of the second bolts extend to the upper ends of the glass chip and are fixed through screwing the two second bolts.

The method for researching the penetration rule of the drilling and completion fluid along the well periphery stratum by using the device mainly comprises the following steps:

(1) Filling the first intermediate container tank and the second intermediate container tank with drilling completion fluid and completion fluid respectively, and dyeing the drilling fluid in the first intermediate container tank and the completion fluid in the second intermediate container tank respectively;

(2) Loading the prepared standard core into a core holder and fixing, or placing a glass chip into a reaction seat and fixing;

(3) Opening a gas storage bottle, a gas booster pump and an air compressor, respectively conveying high-pressure gas into a first gas storage tank and a second gas storage tank, adjusting a first pressure regulating valve, and observing a first pressure gauge until the gas pressure in the first gas storage tank and the second gas storage tank reaches a preset value;

(4) Setting an outlet pressure value of a back pressure valve through a hand pump;

(5) The first air storage tank is started to convey high-pressure air into the fourth main pipeline, the second air inlet end of the core holder or the third air inlet end of the visual pressurizing cabin is communicated, the third pressure regulating valve positioned on the connecting loop of the second air inlet end or the third air inlet end is regulated, and the fourth air pressure gauge on the corresponding connecting loop is observed until the confining pressure in the visual pressurizing cabin of the core holder reaches a preset value; starting the first electric heating sleeve or the second electric heating sleeve to heat the inside of the core holder or the visual pressurizing cabin until the temperature in the core holder or the visual pressurizing cabin reaches a preset value; simultaneously, a second regulating valve is regulated, a third main pipeline and a fifth main pipeline are communicated, a second air storage tank is started to convey high-pressure air into the third main pipeline and the fifth main pipeline, and a third barometer is observed until the outlet pressure of a back pressure valve is regulated to a preset value;

(6) The first air inlet of the first middle container tank is communicated with the second air inlet of the second middle container tank, the second liquid inlet end of the core holder or the visual pressurizing cabin is communicated with the second air inlet end of the core holder or the visual pressurizing cabin, the second air storage tank is continuously started to convey high-pressure gas into the first main pipeline, timing is started, a hydraulic gauge and a flowmeter are observed, and meanwhile the permeation quantity and the permeation distance of working liquid in the first middle container tank or the second middle container tank in a standard core or glass chip are recorded.

The technical scheme provided by the invention has the beneficial effects that: (1) The invention provides a visual experimental device for drilling and completing fluid along the penetration rule of a well surrounding stratum, which is designed to fully consider the practical characteristics of drilling and well flushing processes and well cementation operation, provides a new experimental means for researching the invasion rule of external working fluid in a well Zhou Youqi stratum under the conditions of driving pressure and different temperatures, and has the advantages of convenient operation, modularization, high integration degree and the like;

(2) The displacement reaction system completes the research of the penetration reaction of the drilling and completion fluid under two technical means, one is that when the penetration reaction research is carried out on a natural or artificial standard rock core, a rock core holder can be used for carrying out the penetration reaction research experiment, the other is that a glass chip simulates the penetration research of the natural or artificial rock core, the glass chip penetration experiment can microscopically research the pore characteristics and the penetration rule of the drilling and completion fluid, and simultaneously microscopically explain the experimental rule of a visual rock core holder, thereby improving the accuracy of the research result of the penetration rule of the drilling and completion fluid in the well surrounding stratum.

(3) The method for researching the penetration rule of the drilling and completion fluid in the well surrounding stratum is used for pre-evaluating the damage of the reservoir, guiding the drilling and completion technology and optimizing the well cementation process, and avoiding the loss of oil gas exploitation caused by penetration of the external drilling and completion fluid in the well surrounding stratum.

Drawings

FIG. 1 is a schematic diagram of an apparatus for studying the penetration law of a drilling and completion fluid along a well periphery according to the present invention;

FIG. 2 is a schematic view of the core holder according to the present invention;

FIG. 3 is an enlarged schematic view of FIG. 2A;

FIG. 4 is a schematic view of the structure of the visual pressurizing cabin according to the present invention;

FIG. 5 is an enlarged schematic view of B in FIG. 4;

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.

Referring to fig. 1, an embodiment of the present invention provides a device for researching penetration law of drilling and completion fluid along a well periphery stratum, which includes a displacement reaction system, a first intermediate container tank 10, a second intermediate container tank 11, a gas/liquid pressurizing injection system and a waste liquid collecting system 80, wherein the displacement reaction system is provided with a first liquid inlet end, a first liquid outlet end and a first gas inlet end for holding a test core, the first intermediate container tank 10 and the second intermediate container tank 11 are of hollow cylinder structures in the interior, the first intermediate container tank 10 is provided with a first gas inlet and a first liquid outlet, the second intermediate container tank 11 is provided with a second gas inlet and a second liquid outlet, the first liquid outlet and the second liquid outlet are both connected with the first liquid inlet end of the displacement reaction system, the first intermediate container tank 10 is used for holding drilling fluid, the second intermediate container tank 11 is used for holding drilling fluid, and the first gas inlet end of the displacement reaction system is respectively connected with the first gas inlet end of the displacement reaction system, the second gas inlet end of the displacement reaction system is used for holding the waste liquid collecting system, and the waste liquid collecting system 80 is provided with the first gas inlet end of the displacement reaction system.

In the above embodiment, the gas/liquid pressurizing injection system includes the gas bomb 20, the gas booster pump 21, the air compressor 22, the first gas storage tank 23 and the second gas storage tank 24, the gas bomb 20 with the air compressor 22 all with the gas booster pump 21 is connected, specifically through the delivery line connection, just be equipped with first air-vent valve 30 and first barometer 40 on the delivery line of gas bomb 20 with the gas booster pump 21, be equipped with third air inlet and third gas outlet on the first gas storage tank 23, be equipped with fourth air inlet and fifth gas outlet on the second gas storage tank 24, third air inlet and fourth air inlet all with the gas booster pump 21 is connected, the third gas outlet through fourth trunk line 50 with the first inlet end of displacement reaction system, be equipped with eighth relief valve 70 on the fourth trunk line 50, the fifth gas outlet through the second trunk line 51 respectively with first air inlet and second air inlet, specifically be equipped with sixth sub-pipeline is all equipped with on first air inlet and second air inlet, be equipped with fourth sub-pipeline 24 through second trunk line 51 and second main line 51 and third main line 52 and third sub-vent valve 52 are equipped with on the fourth trunk line 51 through the second trunk line 51 and third main line 52. The nitrogen is stored in the gas storage bottle 20, and is conveyed into the first gas storage tank 23 and the second gas storage tank 24 through the air compressor 22 and the gas booster pump 21, and meanwhile, the first gas storage tank 23 and the second gas storage tank 24 can be pressurized, so that the pressure in the first gas storage tank 23 and the second gas storage tank 24 is higher than the pressure required by an experiment; and then the high-pressure nitrogen gas is conveyed into the first intermediate container tank 10, the second intermediate container tank 11 and the displacement reaction system, on one hand, the conveyed high-pressure nitrogen gas is used as a power source to drive working fluid in the first intermediate container tank 10 and the second intermediate container tank 11 into the displacement reaction system, and power is provided for the outlet pressure of the liquid outlet end of the displacement reaction system, and on the other hand, the high-pressure nitrogen gas is conveyed to the displacement reaction system so as to simulate the high-pressure environment of a stratum in the displacement reaction system. The first pressure regulating valve 30 and the second pressure regulating valve 31 are used for regulating the output pressure of the nitrogen in the gas cylinder 20 and the second gas storage tank 24 respectively, the first barometer 40, the second barometer 41 and the third barometer 42 are used for monitoring the pressure of the gas flowing through the corresponding pipeline on the corresponding branch, and the first safety valve 71 and the second safety valve 72 are used for switching off and switching on the corresponding pipeline.

In the above embodiment, the waste liquid collecting system 80 is used for reasonably collecting the waste liquid generated in the reaction, so as to improve the environmental protection performance of the device. The structure of the waste liquid collecting system 80 is not limited in the present invention, and any container that can collect waste liquid in a concentrated manner may be used as an example of the waste liquid collecting system 80 in the present invention.

In the above embodiment, the displacement reaction system includes a core holder 150 and a visual pressurizing chamber 160, which are both used for loading a test core, where the core holder has a second liquid inlet end, a second liquid outlet end and a second air inlet end, the visual pressurizing chamber has a third liquid inlet end, a third liquid outlet end and a third air inlet end, the second liquid inlet end and the third liquid inlet end are both provided with first sub-pipelines, each first sub-pipeline is provided with a fourth safety valve 75, each first liquid outlet and each second liquid outlet is provided with a second sub-pipeline, each second sub-pipeline is provided with a third safety valve 73, both first sub-pipelines are respectively communicated with the second sub-pipelines through the first main pipeline 54, the first main pipeline 54 is provided with a hydraulic meter 82 and a flow meter 83, the second liquid outlet end and the third liquid outlet end are respectively provided with a third sub-pipeline, each third sub-pipeline is provided with a fifth safety valve 74, the two third sub-pipelines are respectively communicated with the third main pipeline 52 and the waste liquid collecting system 80 through a fifth main pipeline 53, the fifth main pipeline 53 is provided with a back pressure valve 81, and the back pressure valve 81 is provided with a hand pump, wherein the hand pump is used for setting the back pressure of the back pressure valve 81, the back pressure valve 81 is used for controlling the outlet pressure of the first liquid outlet end of the displacement reaction system, the outlet pressure of the first liquid outlet end of the displacement reaction system is ensured to be always kept at a preset value, displacement pressure difference between an inlet and an outlet is realized, and the principle of controlling the outlet pressure of the first liquid outlet end through the hand pump, the back pressure valve 81 and the second air storage tank 24 is as follows: the back pressure of the back pressure valve 81 is set through the hand pump, high-pressure gas is input into the third main pipeline 52 through the second gas storage tank 24, the outlet pressure of the first liquid outlet end is set after the pressure value of the gas in the third main pipeline 52 and the fifth main pipeline reach a preset value, and the liquid in the displacement reaction system can pass through the back pressure valve 81 only after the outlet pressure of the first liquid outlet end reaches the preset value. The second air inlet end and the third air inlet end are respectively provided with a fourth sub-pipeline, the two fourth sub-pipelines are respectively communicated with the fourth main pipeline 50, and each fourth sub-pipeline is provided with a third pressure regulating valve 32 and a fourth barometer 43. The hydraulic gauge 82 is used for recording hydraulic pressure in the first sub-pipe on the core holder through the first main pipe 54 at different moments, the flowmeter 83 is used for monitoring fluid speeds of drilling fluid or finishing fluid in the first sub-pipe on the core holder through the first main pipe 54 at different moments so as to record reaction conditions, and it is to be noted that the test core in the invention comprises two types of natural or artificial cores, one type of natural or artificial cores is standard cores with the specification of 25×100mm, the other type of artificial glass chips manufactured according to experimental requirements, a natural core casting sheet is adopted, a rock skeleton and a pore structure are obtained through image processing, the natural or artificial core skeleton and the pore structure are copied onto glass by using a photochemical etching technology, and a microscopic simulation transparent glass chip is manufactured, which has a simulation experiment glass chip with the same pore structure as that of the natural or artificial cores, and based on this, the simulation glass chip can replace the experiment of researching the penetration rule of the well completion fluid along the well circumference stratum by using the simulation glass chip. The displacement reaction system of the embodiment completes the penetration reaction research of the drilling and completion fluid under two technical means, one is that when the penetration reaction research is carried out on a natural or artificial standard rock core, a rock core holder can be utilized to carry out the penetration reaction research experiment, the other is that a glass chip simulates the penetration research of the natural or artificial rock core, the glass chip penetration experiment can microscopically research the pore characteristics and the penetration rule of the drilling and completion fluid, and simultaneously microscopically explain the experimental rule of the visual rock core holder, so that the accuracy of the research result of the penetration rule of the drilling and completion fluid in the stratum around the well is improved.

In the above embodiment, the core holder includes a casing 90, a ring pressing cylinder and two fixing gaskets 91, the casing 90 is of a rectangular structure with hollow inside, the ring pressing cylinder is horizontally disposed in the casing 90, the axial direction of the ring pressing cylinder is consistent with the length direction of the casing 90, the fixing gaskets 91 are of a disc structure, the two fixing gaskets 91 are coaxially disposed at two ends of the ring pressing cylinder respectively, one side of the fixing gaskets is fixedly connected with the corresponding end of the ring pressing cylinder, the other side of the fixing gaskets extends to the inner wall corresponding to the casing 90, the fixing gaskets 91 are provided with first through holes matched with the axial core holes of the ring pressing cylinder, the casing 90 is provided with second through holes matched with the axial core holes of the ring pressing cylinder, the second through holes, the first through holes and the axial core holes of the ring pressing cylinder are all coaxially disposed and communicated, the second through holes are detachably disposed at the second through holes, one side of the plug devices is fixedly connected with the corresponding ends of the ring pressing cylinder, the other side of the fixing gaskets extends to the corresponding end caps, the first through holes are fixedly connected with the inner wall of the ring pressing cylinder, the second through holes are respectively, the third through holes are respectively arranged on the outer side of the ring pressing cylinder 998, the second through holes are respectively connected with the fourth through holes, the ring pressing cylinder 998 is provided with the outer through holes, the third through holes 997 are respectively, the fourth through holes are respectively communicated with the outer through holes 997, and the outer through the outer ring pressing cylinder is respectively, and the fourth through holes 997 are respectively, and the outer through valve is respectively.

In the above embodiment, the device further includes a first electric heating sleeve 92, a first temperature sensor 93 and a first temperature controller 94, where the first electric heating sleeve 92 wraps the outer periphery of the ring pressing cylinder, a first notch is provided on the first electric heating sleeve 92, the first temperature sensor 93 is disposed at any one of the plug devices and is used for detecting the temperature of the ring pressing cylinder, and the first temperature controller 94 is respectively connected with the first electric heating sleeve 92 and the first temperature sensor 93, and the first heat insulation member 95 is filled in the housing 90. The first notch is used for observing the penetration process of the core in the annular pressure cylinder, so that the invasion state of the standard core in the annular pressure cylinder can be known and recorded in time. For convenient observation, the first notch is a rectangular notch, and the length direction of the first notch is arranged along the axial direction of the ring pressing cylinder and is slightly smaller than the axial length of the ring pressing cylinder. The first insulating member 95 is insulating cotton for maintaining the heating temperature in the housing 90 and preventing heat dissipation. The first electric heating sleeve 92 is provided with a pipeline channel for the fifth sub-pipeline and the fourth sub-pipeline to pass through. The first temperature sensor 93 is model PT100 and the first temperature controller 94 is C100.

In the above embodiment, the plug device includes a plug 96 and a plug bolt 97, the second through hole is coaxially provided with a plug nut 98 matching with the plug bolt 97, the plug bolt 97 is screwed in the corresponding plug nut 98, the plug bolts 97 are coaxially provided with a third through hole 99, the second through hole, the first through hole and the axial core hole of the ring pressure cylinder are coaxially arranged and communicated, the plug 96 is arranged between the ring pressure cylinder and the plug bolt 97, one end of the plug 96 is abutted with the ring pressure cylinder, the other end of the plug 96 is abutted with the threaded end of the plug bolt 97, one end of the plug 96, which is close to the plug bolt 97, is provided with a first groove 991 arranged along the axial direction of the plug bolt, the first groove 991 is cylindrical, the aperture of the plug bolt is consistent with that of the third through hole 99, the bottom wall of the first groove 991 is provided with a fourth through hole 992 matching with the first sub-pipe, one end of the plug 96 is provided with a second groove 993 on the bottom wall of the first groove 991, the plug 96 is correspondingly provided with a second groove 993, the first through hole 993 is correspondingly pressed with the third through hole 993, and the second through hole 993 is correspondingly pressed in the first through hole 992. The plug 96 is made of a metal material with good heat conduction performance, such as copper. The purpose of the first groove 991 and the second groove 993 is to make the installation position of the first temperature sensor 93 maximally close to the ring pressure cylinder, so as to improve the accuracy of the measurement result of the first temperature sensor 93.

In the above embodiment, the ring pressing cylinder is composed of an outer cylinder 994 and an adhesive sleeve 995, the outer cylinder 994 is horizontally disposed, the adhesive sleeve 995 is coaxially disposed in the outer cylinder 994, two ends of the adhesive sleeve are respectively aligned with and connected with two corresponding ends of the outer cylinder 994, a ring pressing cavity 996 is formed between the outer cylinder 994 and the adhesive sleeve 995, two ends of the outer cylinder 994 are both connected with the outer cylinder 90 through corresponding fixing gaskets 91, the outer periphery of the outer cylinder 994 is made of transparent glass, the adhesive sleeve 995 is also made of transparent material, such as PVC material, the motor is wrapped on the outer cylinder 994, the upper end of the outer cylinder 90 is provided with a second notch, transparent glass is disposed in the second notch, the second notch and the first notch are located on the same straight line to form a visual window, a ring pressing inlet 997 and a ring pressing outlet 998 are respectively disposed on the outer periphery of the outer cylinder 994, the ring pressing inlet 997 and the ring pressing outlet 998 are both of the ring pressing structure and the ring pressing inlet 998 are respectively communicated with the ring pressing cavity 998.

In the invention, the first sub-pipeline of the core holder forms a second liquid inlet end of the core holder, and the third sub-pipeline is a second liquid outlet end of the core holder. The outer barrel 994 of the ring pressing barrel is fixed in the outer shell 90 through the two fixed gaskets 91, a lofting channel is formed after the second through hole is communicated with the first through hole, after a standard rock core is placed in the ring pressing barrel through the lofting channel, two plugs 96 are respectively placed at two ends of the ring pressing barrel, plug bolts 97 are installed in corresponding plug nuts 98, and the standard rock core is limited in the rubber sleeve 995 of the ring pressing barrel by screwing the two plug bolts 97. The third pressure regulating valve 32 on the fourth pipeline of the annular pressure inlet 997 is regulated, the confining pressure is set, the first air storage tank 23 is started at the same time, high-pressure air is conveyed into the annular pressure cavity 996, the high-pressure environment of the stratum is simulated, and the pressure value on the fourth air pressure gauge 43 on the fourth sub-pipeline of the annular pressure inlet 997 is observed and recorded. Meanwhile, the heating temperature of the first electric heating sleeve 92 is controlled through the first temperature controller 94, so that the temperature in the annular pressure cylinder is increased, the temperature of the annular pressure cylinder is monitored in real time through the first temperature sensor 93, a temperature signal is sent to the first temperature controller 94, and when the temperature in the annular pressure cylinder reaches a preset value, the first temperature controller 94 controls the first electric heating sleeve 92 to be disconnected, and heating and temperature rising are stopped so as to simulate the high-temperature environment of the stratum. The third safety valve 73 of the second sub-pipeline on the first liquid outlet or the third safety valve 73 of the second sub-pipeline on the second liquid outlet and the fourth safety valve 76 of the first sub-pipeline on the second liquid inlet end are opened, so that the working liquid in the first intermediate container tank 10 or the second intermediate container tank 11 is input into the first sub-pipeline on the core holder through the corresponding second sub-pipeline and the first main pipeline 54 to enter the standard core for an intrusion reaction, after the intrusion reaction is finished, the fifth safety valve 74 of the third sub-pipeline on the second liquid outlet end is opened, and the generated waste liquid is discharged into the waste liquid collecting system 80 through the third sub-pipeline on the second liquid outlet end and the fifth main pipeline 53 for collection. The outer barrel 994 and the rubber sleeve 995 are transparent structures, and the first electric heating sleeve 92 and the outer shell 90 are provided with notches, so that the core invasion degree can be conveniently observed and recorded at any time, and in addition, in order to conveniently record the penetration distance, the rubber sleeve 995 is provided with scale marks. In order to truly simulate the process of researching the invasion of the working fluid into the stratum in the actual stratum environment, in the embodiment, a ring pressure cavity 996, a first electric heating sleeve 92, a first temperature sensor 93 and a first temperature controller 94 are arranged in the core holder, wherein the ring pressure cavity 996 can bear ring pressure of 20MPa, the high-pressure environment of the stratum is truly simulated, the first electric heating sleeve 92, the first temperature sensor 93 and the first temperature controller 94 simulate stratum temperature conditions of 0-200 ℃, and the temperature in the ring pressure cylinder can be sensitively and automatically adjusted and monitored. The core holder is suitable for high temperature and high pressure conditions, can well meet the test experiment requirements, is more beneficial to completing the core penetration experiment, can observe the drilling and completion fluid penetration distances at different times in real time through the visual window, is different from the traditional core holder, and has the advantages that the glue sleeve 995 and the outer barrel 994 are of transparent structures, the drilling and completion fluid penetration process and penetration distance can be monitored and recorded at any time, and the experimental process is conveniently known.

The visual pressurizing cabin comprises a cabin body 100, a reaction seat 101, a glass chip and a cover body 103, wherein the cabin body 100 is of a vertically arranged cylinder structure, the interior of the cabin body is hollow, a base 104 is arranged at the lower end of the cabin body 100, a cylindrical third groove is coaxially arranged at the upper end of the cabin body 100, a second electric heating sleeve 106 is arranged in the third groove, the reaction seat 101 is positioned in the cylinder structure matched with the third groove, the reaction seat is vertically arranged in the third groove, the lower end of the reaction seat extends into the second electric heating sleeve 106, the second electric heating sleeve 106 is wrapped on the periphery of the lower end of the reaction seat 101, the upper end of the second electric heating sleeve extends out of the third groove, a cylindrical fourth groove 107 is coaxially arranged at the upper end of the reaction seat 101, the glass chip is arranged in the fourth groove 107, the cover body 103 is arranged at the upper end of the reaction seat 101, the upper end of the reaction seat 101 is detachably mounted through bolts so as to cover or open the upper end of the reaction seat 101, a convex ring 108 matched with the fourth groove 107 is coaxially arranged at the lower end of the cover body 103, when the cover body 103 covers the reaction seat 101, the convex ring 108 stretches into the fourth groove 107, a sealing ring is arranged at the periphery of the convex ring 108, a third notch 110 communicated with the convex ring 108 is arranged at the upper end of the cover body 103, transparent glass is arranged in the third notch 110 and the convex ring 108, a first working fluid inlet 111, a first working fluid outlet 112 and a first confining pressure inlet 113 communicated with the third groove are respectively arranged at the lower end of the cabin body 100, a second working fluid inlet 114, a second working fluid outlet 115 and a second confining pressure inlet 116 communicated with the fourth groove 107 are arranged at the lower end of the reaction seat 101, the second working solution inlet 114 is communicated with the first working solution inlet 111 to form a working solution inlet channel, the second working solution outlet 115 is communicated with the first working solution outlet 112 to form a working solution outlet channel, the second confining pressure inlet 116 is communicated with the first confining pressure inlet 113 to form a confining pressure inlet channel, the first sub-pipeline is arranged in the working solution inlet channel, the third sub-pipeline is arranged in the working solution outlet channel, the fourth sub-pipeline is arranged in the confining pressure inlet channel, the second thermal insulation member 117 is filled in the cabin 100, and the second thermal insulation member 117 is thermal insulation cotton.

In the above embodiment, the glass chip fixing device further comprises a chip pressing plate 118 and two rubber gaskets 119, the chip pressing plate 118 is arranged above the glass chip, the chip pressing plate 118 is detachably connected with the bottom wall of the fourth groove 107 through a plurality of third bolts 120, two threaded through holes are formed in the chip pressing plate 118, second bolts 121 are arranged in each threaded through hole in a threaded mode, the two rubber gaskets 119 are arranged above the glass chip and are respectively and correspondingly arranged at the lower ends of the threaded ends of the two second bolts 121, the glass chip is fixed by screwing the two second bolts 121, and the rubber gaskets 119 can prevent the second bolts 121 from scratching the glass chip.

In the above embodiment, the third groove is formed by a fifth groove 105 and a sixth groove 122 coaxially disposed in sequence from bottom to top, the fifth groove 105 and the sixth groove 122 are both in a cylindrical structure, the diameter of the fifth groove 105 is larger than that of the sixth groove 122, the upper end of the sixth groove 122 extends to be flush with the upper end of the cabin 100, the second electric heating jacket 106 is disposed in the fifth groove 105, the reaction seat 101 is in a cylindrical structure matched with the sixth groove 122, the lower ends of the reaction seat penetrate through the sixth groove 122 and the fifth groove 105 respectively, and extend into the fifth groove 105, the upper ends of the reaction seat extend out of the sixth groove 122, and the first working fluid inlet 111, the first working fluid outlet 112 and the first confining pressure inlet 113 are all communicated with the fifth groove 105.

In the above embodiment, the glass chip has a rectangular structure, a seventh rectangular groove 123 is formed in the bottom wall of the fourth groove 107, the second working fluid inlet 114, the second working fluid outlet 115 and the second confining pressure inlet 116 are all communicated with the seventh groove 123, O-rings 124 are disposed at positions of the seventh groove 123 corresponding to the second working fluid inlet 114 and the second working fluid outlet 115, the glass chip is horizontally disposed on the O-rings 124, and the chip pressing plate 118 is disposed in the fourth groove 107. The O-ring 124 is used for cushioning the glass chip, preventing the glass chip from adhering to the bottom wall of the seventh groove 123 under the action of high temperature and high pressure, and blocking the second working fluid inlet 114, the second working fluid outlet 115 and the second confining pressure inlet 116, so as to affect the normal transportation of the working fluid and the high pressure gas.

In the above embodiment, the reaction chamber further includes a second temperature sensor 125 and a second temperature controller 126, a first installation through hole communicating with the fifth groove 105 is provided at a lower end of the chamber body 100, a second installation through hole communicating with the seventh groove 123 is provided at a lower end of the reaction seat 101, the first installation through hole and the second installation through hole are communicated to form an installation channel, the second temperature sensor 125 is installed in the installation channel and is used for detecting a temperature in the reaction seat 101, and the second temperature controller 126 is connected with the second temperature sensor 125 and the second electric heating sleeve 106 respectively.

In the invention, a first sub-pipeline arranged in the working fluid inlet channel forms a third liquid inlet end of the visual pressurizing cabin, a third sub-pipeline arranged in the working fluid outlet channel forms a third liquid outlet end of the visual pressurizing cabin, and a fourth sub-pipeline arranged in the confining pressure inlet channel forms a third air inlet end of the visual pressurizing cabin. When an invasion experiment of the simulated rock core is to be performed, a glass chip is placed in the seventh groove 123, then the chip pressing plate 118 is placed in the fourth groove 107, the glass chip is fixed in the fourth groove 107 through a plurality of third bolts 120, and after the glass chip is fixed through screwing two second bolts 121, the cover body 103 is covered. The third pressure regulating valve 32 of the fourth sub-pipe installed in the confining pressure inlet passage is opened, the confining pressure is set, and simultaneously the first air storage tank 23 is started to convey high-pressure gas into the seventh groove 123 and the fourth groove 107 so as to simulate the high-pressure environment of the stratum. Meanwhile, the heating temperature of the second electric heating sleeve 106 is controlled through the second temperature controller 126, so that the temperatures in the seventh groove 123 and the fourth groove 107 are increased, the temperatures of the seventh groove 123 and the fourth groove 107 are monitored in real time through the second temperature sensor 125, and then a temperature signal is sent to the second temperature controller 126, when the temperatures in the seventh groove 123 and the fourth groove 107 reach a preset value, the second temperature controller 126 controls the disconnection of the second electric heating sleeve 106, and the heating are stopped so as to simulate the high-temperature environment of the stratum. The third safety valve 73 of the second sub-pipeline on the first liquid outlet or the third safety valve 73 of the second sub-pipeline on the second liquid outlet and the fourth safety valve 75 of the first sub-pipeline on the second liquid inlet end are opened, so that the working liquid in the first intermediate container tank 10 or the second intermediate container tank 11 is input into the first sub-pipeline in the working liquid inlet channel through the corresponding second sub-pipeline and the first main pipeline 54 and then enters the glass chip to simulate the process of the working liquid invading the core, after the invasion reaction is finished, the fifth safety valve 74 of the third sub-pipeline on the working liquid outlet channel is opened, and the generated waste liquid is discharged into the waste liquid collecting system 80 through the third sub-pipeline and the fifth main pipeline 53 which are arranged in the working liquid outlet channel for collection. According to the visual pressurizing cabin, the glass chip is used for replacing the test rock core, the stratum environment with high temperature and high pressure is simulated in the reaction seat 101, the stratum environment when the actual working solution invades the rock core can be reduced to a high degree, the invasion rule of the working solution in the rock core can be researched without taking the test rock core in the field, the experimental steps are simplified, and the visual pressurizing cabin has the advantages of being high in experimental result precision, convenient to operate and the like.

The device for researching the penetration rule of the drilling and completion fluid along the well circumference further comprises a data acquisition unit 130 and a data processing unit 140, wherein the data acquisition unit 130 is arranged above the shell 90 and above the cover body 103, the data acquisition end of the data acquisition unit 130 positioned above the shell 90 is positioned on the same straight line with the center of the first notch, the data acquisition end of the data acquisition unit 130 positioned above the cover body 103 is positioned on the same straight line with the center of the second notch, the data acquisition unit 130 is connected with the data processing unit 140, the data acquisition unit 130 is used for acquiring the penetration condition of the working fluid in the annular pressure cylinder or the reaction seat 101, and transmitting the information acquired only to the data processing unit 140, wherein the data acquisition unit 130 can be a microscopic camera or a video camera, and the data processing unit 140 is a computer. It should be noted that, the data acquisition unit 130 and the data processing unit 140 in the present invention are all related art, and the data acquisition principle and the data processing principle thereof are not described herein.

The data acquisition unit 130 and the data processing unit 140 can automatically monitor and record the whole process of the permeation experiment, and have the advantage of releasing manpower.

The invention provides a visual experimental device for drilling and completion fluid permeation rules along a well surrounding stratum, which is designed to fully consider the practical characteristics of drilling, well flushing and well cementation operation, provides a new experimental means for researching the permeation rules of external working fluid in a well Zhou Youqi stratum under the conditions of driving pressure and different temperatures, and has the advantages of convenience in operation, modularization, high integration degree and the like.

The method for researching the penetration rule of the drilling and completion fluid along the well periphery stratum by using the device mainly comprises a method for completing a penetration experiment by using a core holder and two methods for completing a glass chip simulation experiment by using a visual pressurizing cabin. The method for completing the permeation experiment by adopting the core holder mainly comprises the following steps of:

(1) Filling drilling fluid and completion fluid into the first intermediate container tank and the second intermediate container tank respectively, and dyeing the drilling fluid in the first intermediate container tank and the completion fluid in the second intermediate container tank respectively;

(2) Loading the prepared standard core into a core holder and fixing the core by using a plug device;

(5) Closing the second safety valve, opening the first safety valve and the third safety valve which are arranged on the gas conveying pipeline of the first intermediate container tank, or opening the first safety valve and the third safety valve which are arranged on the gas conveying pipeline of the second intermediate container tank, and the fourth safety valve and the fifth safety valve which are arranged on the liquid conveying pipeline of the core holder, starting timing and observing the hydraulic meter and the flowmeter, and simultaneously recording the drilling and completion fluid penetration quantity and the observed working fluid penetration distance. When the penetration rule of the drilling fluid needs to be studied, the first safety valve and the third safety valve on the gas conveying pipeline of the first intermediate container tank can be opened, and when the penetration rule of the well completion fluid needs to be studied, the first safety valve and the third safety valve on the gas conveying pipeline of the second intermediate container tank can be opened.

The method for completing the intrusion experiment by adopting the visual pressurizing cabin mainly comprises the following steps:

(2) Loading the prepared glass chip into a visual pressurizing cabin and fixing;

(3) Opening a gas storage bottle, a gas booster pump and an air compressor, respectively conveying high-pressure gas into a first gas storage tank and a second gas storage tank, regulating a first pressure regulating valve, observing a first pressure gauge, and until the gas pressure in the first gas storage tank and the second gas storage tank reaches a preset value;

the second regulating valve is regulated, the second safety valve is opened, the second gas storage tank conveys high-pressure gas into the third main pipeline to regulate the outlet pressure of the back pressure valve, and the third barometer is observed until the outlet pressure of the back pressure valve is regulated to a preset value;

(5) Opening an eighth safety valve, adjusting a third pressure regulating valve arranged on a gas conveying pipeline of the visual pressurizing cabin, and observing a fourth barometer until the confining pressure of the visual pressurizing cabin reaches a preset value; setting a heating temperature in a second temperature controller, opening a second electric heating sleeve to start heating until the temperature in the visual pressurizing cabin reaches a preset value, adjusting a second regulating valve, opening a second safety valve, conveying high-pressure gas into a third main pipeline by a second gas storage tank, and observing a third barometer until the outlet pressure of a back pressure valve is regulated to the preset value;

(6) Closing the second safety valve, opening the first safety valve and the third safety valve which are arranged on the gas conveying pipeline of the first intermediate container tank, or opening the first safety valve and the third safety valve which are arranged on the gas conveying pipeline of the second intermediate container tank, and the fourth safety valve and the fifth safety valve which are arranged on the liquid conveying pipeline of the core holder, starting timing and observing the hydraulic meter and the flowmeter, and simultaneously recording the drilling and completion fluid penetration quantity and the observed working fluid penetration distance. When the penetration rule of the drilling fluid needs to be studied, the first safety valve and the third safety valve on the gas conveying pipeline of the first intermediate container tank can be opened, and when the penetration rule of the well completion fluid needs to be studied, the first safety valve and the third safety valve on the gas conveying pipeline of the second intermediate container tank can be opened.

Here, each of the safety valves in the above method is closed by default.

The method for researching the penetration rule of the drilling and completion fluid in the well surrounding stratum is used for pre-evaluating the damage of the reservoir, guiding the drilling and completion technology and optimizing the well cementation process, and avoiding the loss of oil gas exploitation caused by the invasion of the external drilling and completion fluid.

In this document, terms such as front, rear, upper, lower, etc. are defined with respect to the positions of the components in the drawings and with respect to each other, for clarity and convenience in expressing the technical solution. It should be understood that the use of such orientation terms should not limit the scope of the protection sought herein.

The embodiments described above and features of the embodiments herein may be combined with each other without conflict.

The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

1. The device for researching the penetration rule of the well drilling and completion fluid along the well periphery stratum is characterized by comprising a displacement reaction system, a first intermediate container tank (10), a second intermediate container tank (11), a gas/liquid pressurizing injection system and a waste liquid collecting system (80), wherein the displacement reaction system is provided with a first liquid inlet end, a first liquid outlet end and a first air inlet end, and is used for placing a test rock core; the displacement reaction system comprises a core holder (150) and a visual pressurizing cabin (160), which are used for loading a test core;

The core holder comprises a shell (90), a ring pressing cylinder and a first electric heating sleeve (92), wherein the shell (90) is of a rectangular structure with a hollow inside, the ring pressing cylinder is horizontally arranged in the shell (90), a second through hole matched with a shaft core hole of the ring pressing cylinder is formed in the shell (90), the second through hole is coaxially arranged and communicated with the shaft core hole of the ring pressing cylinder, a plug device is detachably arranged at the second through hole and used for closing and opening the corresponding second through hole, each plug device is provided with a connecting channel communicated with the inside of the ring pressing cylinder, a first main pipeline (54) is communicated with one connecting channel of the plug devices, a fifth main pipeline (53) is communicated with the other connecting channel of the plug devices, a ring pressing inlet (997) is formed in the periphery of the ring pressing cylinder and connected with a fourth main pipeline (50), the first electric heating sleeve (92) is wrapped on the periphery of the ring pressing cylinder, and a heat preservation piece (95) is filled in the periphery of the shell;

the visual pressurizing cabin comprises a cabin body (100), a reaction seat (101), a glass chip, a cover body (103) and a second electric heating sleeve (106), wherein the glass chip is of a rectangular structure;

The cabin body (100) is of a vertically arranged cylinder structure, the inside of the cabin body is hollow, a base (104) is arranged at the lower end of the cabin body (100), a cylindrical third groove is coaxially arranged at the upper end of the cabin body (100), the second electric heating sleeve (106) is arranged in the third groove, the reaction seat (101) is of a cylinder structure matched with the third groove, the cylinder structure is vertically arranged in the third groove, the lower end of the cylinder structure extends into the second electric heating sleeve (106), the upper end of the cylinder structure extends to extend out of the third groove, a cylindrical fourth groove (107) is coaxially arranged at the upper end of the reaction seat (101), the glass chip is arranged in the fourth groove (107), the cover body (103) is arranged at the upper end of the reaction seat (101) and is detachably connected with the reaction seat (101), a third notch (110) is vertically arranged at the upper end of the cover body (103), a transparent liquid inlet (116) is arranged in the third groove, a working liquid inlet (116) is communicated with the second inlet (116) and a working liquid outlet (116) of the second inlet (116), the second working fluid inlet (114) is communicated with the first working fluid inlet (111) to form a working fluid inlet channel, the first main pipeline (54) is communicated with the working fluid inlet channel, the second working fluid outlet (115) is communicated with the first working fluid outlet (112) to form a working fluid outlet channel, the fifth main pipeline (53) is communicated with the working fluid outlet channel, the second confining pressure inlet (116) is communicated with the first confining pressure inlet (113) to form a confining pressure inlet channel, the fourth main pipeline (50) is communicated with the confining pressure inlet channel, and a second heat preservation member (117) is filled in the cabin body (100);

The first intermediate container tank (10) and the second intermediate container tank (11) are of hollow cylindrical structures, a first air inlet and a first liquid outlet are formed in the first intermediate container tank (10), a second air inlet and a second liquid outlet are formed in the second intermediate container tank (11), the first liquid outlet and the second liquid outlet are connected with a first liquid inlet end of the displacement reaction system, the first intermediate container tank (10) is used for containing drilling fluid, the second intermediate container tank (11) is used for containing completion fluid, the air/liquid pressurizing injection system is connected with a first air inlet end of the displacement reaction system, the first air inlet of the first intermediate container tank (10) and a second air inlet of the second intermediate container tank (11) respectively, the air inlet end of the displacement reaction system, the first intermediate container tank (10) and the second intermediate container tank (11) are all connected with a first liquid inlet end of the displacement reaction system, the first intermediate container tank (10) and the second intermediate container tank (11) are used for conveying fluid in the displacement reaction system, and the second intermediate container tank (11) is used for conveying high-pressure gas to the first liquid inlet end of the displacement reaction system, and the waste liquid collecting system is used for collecting waste liquid in the displacement reaction system.

2. The device for researching the penetration law of well completion fluid along the well periphery according to claim 1, wherein the gas/liquid pressurizing injection system comprises a gas storage bottle (20), a gas booster pump (21), an air compressor (22), a first gas storage tank (23) and a second gas storage tank (24), wherein the gas storage bottle (20) is respectively connected with the air compressor (22) and the gas booster pump (21) through a first conveying pipeline, a first pressure regulating valve (30) and a first air pressure gauge (40) are arranged on the first conveying pipeline, a third air inlet and a third air outlet are arranged on the first gas storage tank (23), a fourth air inlet and a fifth air outlet are arranged on the second gas storage tank (24), the third air inlet and the fourth air inlet are both connected with the gas booster pump (21), the third air outlet is respectively connected with a first air inlet end of the displacement reaction system through a fourth main pipeline (50), the fifth air outlet is respectively connected with the first air inlet and the second main pipeline (51), the second air outlet is respectively connected with a second main pipeline (51) through a second main pipeline (51), and the second air outlet is connected with a second air pressure regulating valve (41) through a second main pipeline (51), and a second safety valve (72) and a third barometer (42) are arranged on the third main pipeline (52).

3. The device for researching the penetration law of the well completion fluid along the well periphery according to claim 2, wherein the core holder (150) is provided with a second liquid inlet end, a second liquid outlet end and a second air inlet end, the visual pressurizing cabin (160) is provided with a third liquid inlet end, a third liquid outlet end and a third air inlet end, the second liquid inlet end and the third liquid inlet end are respectively communicated with the first air inlet and the second air inlet through a first main pipeline (54), the first main pipeline (54) is provided with a hydraulic gauge (82) and a flowmeter (83), the second liquid outlet end and the third liquid outlet end are communicated with the third main pipeline (52) and the waste liquid collecting system (80) through a fifth main pipeline (53), the fifth main pipeline (53) is provided with a back pressure valve (81), the back pressure valve (81) is provided with a pump, the second air inlet end and the third liquid inlet end are respectively communicated with the fourth main pipeline (50), and the second air inlet end and the third air inlet end are respectively communicated with a hand-operated pressure regulating valve (32).

4. The device for researching the penetration rule of the well completion fluid along the well periphery according to claim 1, wherein the plug device comprises a plug (96) and a plug bolt (97), a plug nut (98) matched with the plug bolt (97) is coaxially arranged at the second through hole, the plug bolt (97) is installed in the corresponding plug nut (98) in a threaded mode, third through holes (99) are coaxially arranged in the plug bolt (97), a ring pressing cylinder and the plug bolt (97) are coaxially arranged between the plug (96), one end of the plug bolt is abutted with the ring pressing cylinder, the other end of the plug bolt is abutted with the threaded end of the plug bolt (97), a cylindrical first groove (991) communicated with the third through holes (99) is coaxially arranged at one end of the plug bolt (96), a fourth through hole (992) communicated with the inside of the ring pressing cylinder is formed in the bottom wall of the first groove (991), and the fourth through hole (992) and the corresponding third through hole (99) are communicated with each other to form a connecting channel.

5. The device for researching the penetration rule of well completion fluid along the well periphery according to claim 4, wherein the annular pressure cylinder is composed of an outer cylinder (994) and a rubber sleeve (995), the outer cylinder (994) is horizontally arranged, the rubber sleeve (995) is coaxially arranged in the outer cylinder (994), two ends of the rubber sleeve are respectively flush with and connected with two corresponding ends of the outer cylinder (994), an annular pressure cavity (996) is formed between the outer cylinder (994) and the rubber sleeve (995), the outer cylinder (994) is wrapped by a first electric heating sleeve (92), a first notch is formed in the first electric heating sleeve (92), a second notch is formed in the upper end of the outer shell (90), transparent glass is arranged in the second notch, the second notch and the first notch are located on the same straight line, an annular pressure inlet (7) and an annular pressure outlet (998) are respectively formed in the periphery of the outer cylinder (994), and the annular pressure inlet (997) and the annular pressure cavity (998) are communicated with the annular pressure cavity (998).

6. The device for studying the penetration law of drilling and completion fluids along a well periphery according to claim 5, characterized in that both the outer cylinder (994) and the glue sleeve (995) are made of transparent material.

7. The device for researching the penetration law of the well completion fluid along the well periphery according to claim 1, further comprising a chip pressing plate (118), wherein a seventh groove (123) is formed in the bottom wall of the fourth groove (107), the second working fluid inlet (114) and the second working fluid outlet (115) and the second confining pressure inlet (116) are both communicated with the seventh groove (123), O-shaped rings (124) are arranged at positions of the seventh groove (123) corresponding to the second working fluid inlet (114) and the second working fluid outlet (115), the glass chip is horizontally arranged on the O-shaped rings (124), the chip pressing plate (118) is arranged in the fourth groove (107) and is detachably connected with the bottom wall of the fourth groove (107), two threaded through holes are formed in the chip pressing plate (118), a second bolt (121) is arranged in each threaded through hole, the threaded end of each second bolt (121) extends to the upper end of the second bolt (121), and the second bolt (121) is screwed down to the upper end of the second bolt.

8. A method for studying the invasion law of a working fluid along a well periphery by using the device for studying the permeation law of a well completion fluid along a well periphery according to any one of claims 1 to 7, which is characterized by mainly comprising the following steps: