CN108119132A - Tight sandstone gas reservoir near-wellbore-zone radial seepage water saturation simulation device and method - Google Patents
Tight sandstone gas reservoir near-wellbore-zone radial seepage water saturation simulation device and method Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000004088 simulation Methods 0.000 title claims abstract description 12
- 239000011435 rock Substances 0.000 claims abstract description 53
- 238000006073 displacement reaction Methods 0.000 claims abstract description 21
- 239000007789 gas Substances 0.000 claims description 42
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 20
- 239000004576 sand Substances 0.000 claims description 17
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- 230000006641 stabilisation Effects 0.000 claims description 7
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 4
- 238000009530 blood pressure measurement Methods 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims description 2
- 238000002474 experimental method Methods 0.000 abstract description 25
- 238000011160 research Methods 0.000 abstract description 6
- 238000011161 development Methods 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 description 6
- 239000012530 fluid Substances 0.000 description 3
- 230000001186 cumulative effect Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000003556 assay Methods 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 1
- 238000005213 imbibition Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/02—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by mechanically taking samples of the soil
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
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- G06Q50/00—Information and communication technology [ICT] specially adapted for implementation of business processes of specific business sectors, e.g. utilities or tourism
- G06Q50/02—Agriculture; Fishing; Forestry; Mining
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Abstract
The invention provides a tight sandstone gas reservoir near-wellbore zone radial seepage water saturation simulation device and method. The device comprises: the device comprises a displacement pump (1), a middle container (2), at least three rock core holders (3) which are connected in series through pipelines and have different diameters, a pressure measuring device (4), a flowmeter (5), a flow controller (6), a confining pressure pump (7), a gas-water separator (8) and a control system (9). The device greatly improves the research level of the water-containing gas reservoir development experiment and fills up the research blank of the related field.
Description
Technical field
The present invention relates to oil-gas mining fields, and specifically, the present invention relates to a kind of nearly well band radial directions of DAMAGE OF TIGHT SAND GAS RESERVOIRS
Seepage flow water saturation simulator and method.
Background technology
In recent years, compact sandstone gas was had been to be concerned by more and more people with its huge resource potential.In production development
In the process, near wellbore zone pressure drop funnel is big, and nearly well reservoir water saturation variation is apparent, the big volume production water of gas well, to gas reservoir development
It is affected.Found through literature survey, near wellbore zone air water flowing belong to Radial Flow Through Porous Media, and can not with discoid rock core and equipment come
Show Radial Flow Through Porous Media.At present in the lab, near wellbore zone Radial Flow also is simulated without relevant device, can not systematically studied near
Well area water saturation changing rule, also in blank stage in terms of gas well near wellbore zone Radial Flow Through Porous Media produces water rule,
Therefore it is badly in need of carrying out scientific research in the research field.For deep understanding DAMAGE OF TIGHT SAND GAS RESERVOIRS near wellbore zone water saturation variation
Rule is, it is necessary to which a kind of special experimental method and experimental facilities are completed.
DAMAGE OF TIGHT SAND GAS RESERVOIRS near wellbore zone water saturation experimental method has circular sandpack column experiment (tight sand at present
Flat physical model), long cores simulated experiment.For tight sand flat physical model, which can be with accurate measurements
The pressure of a point, but its assay volume is larger, and water saturation is established, measurement is difficult, and tests precision very little.For long rock
Heart simulated experiment, the model cannot accurately simulate the planar radial seepage flow of tight sand, it is impossible to embody fine and close sand
The flow regime of reservoir fluid in rock gas reservoir actual production process.
The content of the invention
It is an object of the present invention to provide a kind of nearly well band Radial Flow Through Porous Media water saturation simulations of DAMAGE OF TIGHT SAND GAS RESERVOIRS
Device；
Another object of the present invention is to provide a kind of DAMAGE OF TIGHT SAND GAS RESERVOIRS nearly well band Radial Flow Through Porous Media water saturation simulation
Method.
In order to achieve the above object, on the one hand, the present invention provides a kind of nearly well band Radial Flow Through Porous Media of DAMAGE OF TIGHT SAND GAS RESERVOIRS is aqueous full
With degree simulator, wherein, described device includes：Displacement pump 1, intermediate receptacle 2, at least three are connected in series straight by pipeline
The different core holding unit 3 in footpath, pressure measuring unit 4, flowmeter 5, flow controller 6, confining pressure pump 7, moisture trap 8 and control system
System 9.
Some specific embodiments according to the present invention, wherein, the displacement pump pumps for ISCO displacements.
Some specific embodiments according to the present invention, wherein, the intermediate receptacle is titanium alloy intermediate receptacle.
The intermediate receptacle of the present invention is not only the high pressure nitrogen container of saturated gas, and is that simulation DAMAGE OF TIGHT SAND GAS RESERVOIRS is remote
Hold stratum energy supply source.
The intermediate receptacle uses the gasket seal of two-stage sealing surface.
Some specific embodiments according to the present invention, wherein, the core holding unit is titanium alloy core holding unit.
Some specific embodiments according to the present invention, wherein, the difference in diameter of two neighboring core holding unit is 1-10cm.
Some specific embodiments according to the present invention, wherein, descending three core holding unit diameters are respectively 5-
15cm, 3-5cm and 1-3cm, and two neighboring core holding unit diameter differs.
Some specific embodiments according to the present invention, wherein, three core holding unit diameters are descending to be respectively
10.5cm, 3.8cm and 2.5cm.
Some specific embodiments according to the present invention, wherein, the length of three core holding units is respectively respective diameter
1.5-2 again.
Some specific embodiments according to the present invention, wherein, the flow controller is to be pressure-resistant up to the high pressure resistant micro- of 30MPa
Pipe.
The present invention can control flow by using the high pressure resistant micro-pipe of different model with simulation wellbore hole, and high pressure resistant micro-pipe can
To greatly improve experimental study ability, deeply recognize monophasic fluid and flowing law of the air-liquid two-phase in micro-pipe, specify fluid
The influence factor and changing rule of boundary layer thickness disclose hypotonic fine and close oil, the microscopic percolation mechanism of gas reservoir.
Some specific embodiments according to the present invention, wherein, the control system is computer.
Some specific embodiments according to the present invention, wherein, displacement pump (1), intermediate receptacle (2), according to diameter by
Big three core holding units (3), de-watering apparatus (8) and flow controller (6) to minispread is linked in sequence by pipeline, and three
A core holding unit respectively by pipeline and confining pressure pump connect, and confining pressure pump core holding unit between pipeline on and
The both ends of each core holding unit set pressure measuring unit, the flowmeter and control system electrical connection.
Some specific embodiments according to the present invention, wherein, the pressure measuring unit (4) includes pressure sensor (41) and pressure
Power detector (42), on the pipeline between the confining pressure pump and core holding unit and both ends of each core holding unit set pressure
Force snesor, and each pressure sensor is electrically connected with pressure detector, pressure detector is electrically connected again with control system (9)
It connects.
Some specific embodiments according to the present invention, wherein, the core holding unit (3) is descending for three diameters
Core holding unit is composed in series：First core holding unit (31), the second core holding unit (32) and the 3rd core holding unit (33),
Wherein described displacement pump (1), intermediate receptacle (2), the first core holding unit (31), the second core holding unit (32), the 3rd rock core
Clamper (33), de-watering apparatus (8) and flow controller (6) are linked in sequence by pipeline, the two of the first core holding unit
Pressure sensing is set respectively on pipeline between end, the second outlet port of rock core holder, the 3rd core holding unit and de-watering apparatus
Device.
Here a kind of set-up mode of specific pressure sensor is merely provided, the pressure sensor can be with it
He is set mode, as long as can be ensured that the pressure change that can measure confining pressure pressure change and each core holding unit；
For example also directly pressure sensor can be arranged on the pipeline of intermediate receptacle connection core holding unit and each rock core clamps
On the pipeline connected between device.
Some specific embodiments according to the present invention, wherein, confining pressure pump (7) be by multiple valve (9) respectively with
Three core holding unit connections, and pressure sensor is set on an access of multiple valve.
Some specific embodiments according to the present invention, wherein, the multiple valve is six channel valves.
Some specific embodiments according to the present invention, wherein, confining pressure pump (7) is connected by pipeline with multiple valve (9), more
Channel valve is connected again with three core holding units respectively by pipeline.
Some specific embodiments according to the present invention, wherein, between the 3rd core holding unit (33) and de-watering apparatus (8)
Triple valve (11) on pipeline is set, and the pressure sensor between the 3rd core holding unit (33) and de-watering apparatus (8) is set
It puts on an access of triple valve.
Some specific embodiments according to the present invention, wherein, displacement pump (1) connection intermediate receptacle (2) pipeline on, with
And two-port valve (10) is set respectively on the pipeline of intermediate receptacle (2) connection core holding unit (3).
On the other hand, the present invention also provides a kind of nearly well band Radial Flow Through Porous Media water saturation simulation sides of DAMAGE OF TIGHT SAND GAS RESERVOIRS
Method, wherein, the described method includes：The rock core for taking three diameters different, and be arranged in series according to descending be respectively placed in of diameter
Core holding unit in, to rock core apply confining pressure, the air pressure being then passed through into core holding unit in nitrogen to core holding unit
It is after pressure stabilisation for 20-50MPa, open core holding unit gate out switch, make rock core pressure at two ends in core holding unit from
Right pressure release, the pressure change at three clamper both ends and the water yield of rock core in recording process, to calculate rock core aqueous full
With the gas production under degree, after the air pressure in core holding unit reaches abandonment pressure, removal of core is weighed and is calculated containing water saturation
Degree variation.
Some specific embodiments according to the present invention, wherein, the present invention is to determine rock core according to the depth of rock core extraction
The burden pressure on place stratum, the burden pressure are confining pressure.
Some specific embodiments according to the present invention, wherein, the confining pressure is 20-50MPa.
Some specific embodiments according to the present invention, wherein, the rock core first establishes institute before core holding unit is placed in
Need water saturation.
Some specific embodiments according to the present invention, wherein, include taking out in rock core the step of water saturation needed for foundation
Vacuum and saturation of pressurizeing, the gas flow variation discharged in the pressure change and simulation process of recording process, and contain needed for establishing
Water saturation.
Some specific embodiments according to the present invention, wherein, by the present invention in that carrying out pressurization saturation with water flooding, and remember
The pressure and changes in flow rate of record process, and water saturation needed for foundation.
The detailed process of the method for building up of water saturation is known in the art, for example there is air-dried (drying) method, centrifugation
Method, displacement process and capillary imbibition method；And some specific embodiments according to the present invention, wherein, the present invention is built using displacement process
Vertical water saturation.
Rock core selection of dimension is mainly determined according to core holding unit, and the matched core diameter size one of core holding unit institute
As be 10.5cm, 3.8cm, 2.5cm；Core diameter scope is generally 2.5cm-10.5cm.
Exhaust gas pressure of the present invention is term customary in the art, refers to that gas well maintains the minimum bottom pressure of production；
Scope is usually that outlet pressure drops to initial flowing pressure (IFP) 10-20%.
Some specific embodiments according to the present invention, wherein, the method is to utilize the dress described in any one of the present invention
Put the simulation for carrying out water saturation.
Some specific embodiments according to the present invention, wherein, the described method includes：The rock core for taking three diameters different, and
It is respectively placed according to diameter is descending in the core holding unit (3) being arranged in series, pumping (7) using confining pressure adds core holding unit
Required confining pressure is depressed into, nitrogen is passed through into core holding unit using intermediate receptacle (2) after stablizing, and (1) is pumped to rock using displacement
Continue to be passed through nitrogen in heart clamp holder so that the pressure in core holding unit reaches 20MPa, it is after pressure stabilisation, pass through flow
Controller (6) controls gas flow, opens the switch of flow controller, record each pressure measuring unit pressure change data,
And the water yield of rock core, so as to calculate the gas production under water saturation, after abandonment pressure is reached, removal of core claims
It weighs and calculates water saturation variation.
Some specific embodiments according to the present invention, wherein, it is after pressure stabilisation, triple valve (11) is opened, is then passed through
Flow controller (6) controls gas flow.
The present invention connects large, medium and small three different-diameter rock cores in rock core axis horizontal plane before experiment, three differences
The series connection of diameter rock core just dexterously simulates the small fan-shaped Radial Flow Through Porous Media near wellbore zone one.It is pumped using confining pressure in core holding unit
Rock core adds confining pressure, ISCO displacements pump and intermediate receptacle to carry out saturation pressure to rock core, until after pressure balance, closes ISCO displacements
Pump opens outlet micro-pipe switch, carries out gas reservoir development simulated experiment.There is high-precision pressure in each port of core holding unit
Sensor, and be connected with pressure logging, pressure signal is passed to computer by pressure logging, while has flow in exit
Meter record rate of discharge.Reality situation of change when record pressure and flow are shown on computer, until after depletion experiments, poidometer
Water saturation variation is calculated, changes to obtain near wellbore zone Radial Flow Through Porous Media water saturation variation by each rock core water containing saturability
Rule.The test method and equipment carry out water saturation changing rule to be put forward for the first time, for laboratory and provide new experiment side
Method and research.
In conclusion the present invention provides a kind of nearly well band Radial Flow Through Porous Media water saturation simulators of DAMAGE OF TIGHT SAND GAS RESERVOIRS
And method.The solution of the present invention has the following advantages that：
This experimental provision using the existing experiment devices such as clamper, use special pressure sensor, pressure-resistant intermediate receptacle with
And micro-pipe equipment, wherein pressure sensor is 0-40MPa, and precision 0.1% carries out near wellbore zone Radial Flow Through Porous Media water saturation and becomes
Law is tested.Experiment by large, medium and small different-diameter rock core rock core axis horizontal plane connect saturation pressure depletion experiments, no
The small fan-shaped Radial Flow Through Porous Media (Fig. 2) near wellbore zone one is dexterously simulated with the series connection of diameter rock core, it is aqueous so as to study Radial Flow Through Porous Media
Saturation degree changing rule.And micro-pipe is installed in the outlet of set series connection clamper, pit shaft is dexterously simulated by micro-pipe, using not
Carry out the size of simulation wellbore hole diameter with diameter micro-pipe, pit shaft flow is studied to Radial Flow Through Porous Media water saturation changing rule with this
Influence.Water-bearing Gas Reservoir exploitation experimental study level greatly improved in the covering device, fills up association area research blank.
Description of the drawings
Fig. 1 is the equipment of the embodiment of the present invention figure.
Fig. 2 is the small fan-shaped Radial Flow Through Porous Media schematic diagram near wellbore zone.
Fig. 3 is each pressure tap pressure time curve figure；
Each pressure measurement point pressure all increases over time concave curve and slowly declines in Fig. 3, and wherein outlet pressures decline most
Soon, secondly it is the outlet of 3.8 rock cores, the outlet of 10.5 rock cores, inlet pressure, and the pressure drop at middle and later periods each rock core both ends is apparent, energy
Enough reflect the drop of pressure funnel of planar radial seepage flow.
Fig. 4 changes over time graph for exit gas flow；
Fig. 4 middle outlet gas flows are increased over time and are gradually reduced, and are met DAMAGE OF TIGHT SAND GAS RESERVOIRS in production scene and are bled off pressure
Production model.
Fig. 5 is rock core water containing saturability change curve after experiment (outlet micro-pipe is 40 microns).
This it appears that under the 40 microns of micro-pipe controls of outlet micro-pipe, rock core 10.5cm, 3.8cm, 2.5cm distinguish Fig. 5
The water saturation situation of change after saturation depletion experiments under different water cut saturation degree.It can be good at reflecting by each experiment
DAMAGE OF TIGHT SAND GAS RESERVOIRS near wellbore zone water saturation changing rule has very DAMAGE OF TIGHT SAND GAS RESERVOIRS water saturation Changeement
Good help.
Fig. 6 is rock core water containing saturability change curve after experiment.Fig. 6 intuitively reflects water saturation and reality before experiment
Water saturation after testing.
Specific embodiment
Below by way of the specific embodiment implementation process that the present invention will be described in detail and the advantageous effect generated, it is intended to which help is read
Reader more fully understand the present invention essence and feature, not as to this case can practical range restriction.
Embodiment 1
1st, according to requirement of experiment, three kinds of diameter difference rock cores is chosen and are respectively put into three clampers that (diameter is respectively
10.5cm、3.8cm、2.5cm；Length is respectively 1.5 times of respective diameter), rock core vacuumizing is pressurizeed saturation, is established respectively real
Test required water saturation (as shown in figure 5, respectively 60%, 55%, 50%, 45% and 40%)；
2nd, according to Fig. 1 connection equipment, computed pressure record experimental system, discharge record system is opened, debugs pressure record
System determines that logging software, discharge record software etc. are working properly；
3rd, Sandstone Cores needed for experiment are put into clamper first, fixed, connect experiment flow, be added slowly to test
Required confining pressure after a period of stabilisation, prepares to test in next step；
4th, the intermediate receptacle equipped with high pressure nitrogen is connected to 10.5cm core holding unit entrances, by three clamper saturations
High pressure nitrogen is filled with nitrogen, is then pumped by ISCO displacements and pressurizeed to intermediate receptacle so as to three clamper saturation elevated pressure nitrogens
Gas after inlet and outlet pressure at two ends is consistent, stablizes a period of time, closes ISCO displacements pump to 20MPa；
5th, micro-pipe end switch is opened, opens pressure-recording system, discharge record system starts to test；
6th, three clamper pressure at two ends situations of change (as shown in Figure 3), record port of export gas flow variation feelings are recorded
Condition (as shown in Figure 4) and cumulative gas, the cumulative gas can be obtained by being measured on computer record flow software；
7th, after experiment reaches abandonment pressure, terminate experiment, rock core is taken out, weigh, by containing needed for being established before experiment
The rock core water containing saturability weighed after water saturation and experiment changes (such as Fig. 5, Fig. 6 and table 1 to calculate water saturation
It is shown).
Table 1
Claims (10)
- A kind of 1. nearly well band Radial Flow Through Porous Media water saturation simulator of DAMAGE OF TIGHT SAND GAS RESERVOIRS, which is characterized in that described device bag It includes：Displacement pump (1) (being preferably ISCO displacements pump), intermediate receptacle (2) (being preferably titanium alloy intermediate receptacle), at least three pass through The different core holding unit (3) of diameter that pipeline is connected in series (being preferably titanium alloy core holding unit) (preferably two neighboring rock The difference in diameter of heart clamp holder is 1-10cm) (the descending respectively 5-15cm, 3-5cm of preferably three core holding unit diameters, And 1-3cm, and two neighboring core holding unit diameter differs；More preferably 10.5cm, 3.8cm and 2.5cm), pressure measurement Device (4), flowmeter (5), flow controller (6) (preferably controller is pressure-resistant micro-pipe), confining pressure pump (7), moisture trap (8) With control system (9) (preferably described control system is computer).
- 2. the apparatus according to claim 1, which is characterized in that displacement pump (1), intermediate receptacle (2), according to diameter by Big three core holding units (3), de-watering apparatus (8) and flow controller (6) to minispread is linked in sequence by pipeline, and three A core holding unit respectively by pipeline and confining pressure pump connect, and confining pressure pump core holding unit between pipeline on and The both ends of each core holding unit set pressure measuring unit, the flowmeter and control system electrical connection.
- 3. the apparatus according to claim 1, which is characterized in that the pressure measuring unit (4) include pressure sensor (41) and Pressure detector (42), on the pipeline between the confining pressure pump and core holding unit and both ends of each core holding unit are set Pressure sensor, and each pressure sensor is electrically connected with pressure detector, pressure detector is electrically connected again with control system (9) It connects.
- 4. device according to claim 3, which is characterized in that the core holding unit (3) is descending for three diameters Core holding unit be composed in series：First core holding unit (31), the second core holding unit (32) and the 3rd core holding unit (33), wherein displacement pump (1), intermediate receptacle (2), the first core holding unit (31), the second core holding unit (32), the 3rd Core holding unit (33), de-watering apparatus (8) and flow controller (6) are linked in sequence by pipeline, in the first core holding unit Both ends, the second outlet port of rock core holder, pressure is set respectively on the pipeline between the 3rd core holding unit and de-watering apparatus Sensor.
- 5. device according to claim 4, which is characterized in that confining pressure pump (7) be by multiple valve (9) (preferably For six channel valves) it is connected respectively with three core holding units, and pressure sensor is set on an access of multiple valve.
- 6. device according to claim 5, which is characterized in that confining pressure pump (7) is connected by pipeline with multiple valve (9), Multiple valve is connected again with three core holding units respectively by pipeline.
- 7. device according to claim 6, which is characterized in that between the 3rd core holding unit (33) and de-watering apparatus (8) Pipeline on triple valve (11) is set, and by the pressure sensor between the 3rd core holding unit (33) and de-watering apparatus (8) It is arranged on an access of triple valve.
- 8. according to the device described in claim 1~7 any one, which is characterized in that in displacement pump (1) connection intermediate receptacle (2) two-port valve (10) is set respectively on pipeline and on the pipeline of intermediate receptacle (2) connection core holding unit (3).
- A kind of 9. nearly well band Radial Flow Through Porous Media water saturation analogy method of DAMAGE OF TIGHT SAND GAS RESERVOIRS, which is characterized in that the method bag It includes：The rock core for taking three diameters different, and be respectively placed according to diameter is descending in the core holding unit being arranged in series, to rock The heart applies confining pressure, and (burden pressure on stratum, the burden pressure are where preferably determining rock core according to the depth of rock core extraction For confining pressure；The more preferable confining pressure is 20-50MPa), the gas being then passed through into core holding unit in nitrogen to core holding unit It presses as 20-50MPa, it is after pressure stabilisation, core holding unit gate out switch is opened, makes the rock core pressure at two ends in core holding unit Natural pressure release, the pressure change at three clamper both ends and the water yield of rock core in recording process, to calculate rock core aqueous Gas production under saturation degree, after the air pressure in core holding unit reaches abandonment pressure, removal of core is weighed and is calculated aqueous full Change with degree；(wherein preferably first water saturation needed for foundation is (wherein preferred to wrap before core holding unit is placed in for the rock core It includes rock core vacuumizing and saturation of pressurizeing (carrying out pressurization saturation preferably by water flooding is used), the pressure change of recording process Change with the gas flow discharged in simulation process, and water saturation needed for foundation (is preferably established aqueous full using displacement process And degree))).
- 10. according to the method described in claim 9, it is characterized in that, the method is to utilize claim 2~8 any one The device carries out the simulation of water saturation；(preferably the described method includes：The rock core for taking three diameters different, and according to Diameter is descending to be respectively placed in the core holding unit (3) being arranged in series, and pumping (7) using confining pressure is forced into core holding unit Required confining pressure is passed through nitrogen into core holding unit using intermediate receptacle (2) after stablizing, and is pressed from both sides using displacement pump (1) to rock core Continue to be passed through nitrogen in holder so that the pressure in core holding unit reaches 20MPa, it is after pressure stabilisation, pass through flow control Device (6) to control gas flow, (preferably after pressure stabilisation, then by flow controller (6) controlled by opening triple valve (11) Gas flow processed), the switch of flow controller is opened, records the pressure change data of each pressure measuring unit and the production of rock core Water, so as to calculate the gas production under water saturation, after abandonment pressure is reached, removal of core is weighed and is calculated aqueous Saturation degree changes).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711171264.3A CN108119132B (en) | 2017-11-22 | 2017-11-22 | Tight sandstone gas reservoir near-wellbore-zone radial seepage water saturation simulation device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711171264.3A CN108119132B (en) | 2017-11-22 | 2017-11-22 | Tight sandstone gas reservoir near-wellbore-zone radial seepage water saturation simulation device and method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109707376A (en) * | 2019-01-09 | 2019-05-03 | 西南石油大学 | A method of big water body swelling water is invaded in simulation oil-gas reservoir failure recovery process |
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| CN109707376B (en) * | 2019-01-09 | 2020-12-22 | 西南石油大学 | Method for simulating large water body expansion water invasion in oil and gas reservoir failure exploitation process |
| CN111650083A (en) * | 2019-03-04 | 2020-09-11 | 中国石油天然气股份有限公司 | Core high-pressure gas and water flow metering device and method |
| CN110018105A (en) * | 2019-04-29 | 2019-07-16 | 中国石油大学(北京) | Matrix-Fracture System gas simulated flowing apparatus and method |
| CN113638737A (en) * | 2020-04-23 | 2021-11-12 | 中国石油天然气股份有限公司 | Full-period physical simulation device for edge and bottom water gas reservoir multi-well collaborative development |
| CN113899643A (en) * | 2020-07-06 | 2022-01-07 | 中海油能源发展股份有限公司 | Evaluation device and method for scouring resistance experiment of chemical sand prevention consolidation rock core |
| CN113899643B (en) * | 2020-07-06 | 2024-05-28 | 中海油能源发展股份有限公司 | Device and method for evaluating erosion resistance of chemical sand control consolidated core |
| CN114720341A (en) * | 2021-01-05 | 2022-07-08 | 中国石油天然气股份有限公司 | Stress sensitive combined measurement device and method for variable flow pressure and constant confining pressure permeability of multiple rock cores |
| CN114720341B (en) * | 2021-01-05 | 2024-06-25 | 中国石油天然气股份有限公司 | Multi-core variable-flow pressure and constant-confining pressure permeability stress sensitive joint measurement device and method |
| CN115494163A (en) * | 2021-06-17 | 2022-12-20 | 中国石油化工股份有限公司 | System and method for determining gas-gas diffusion coefficient in gas reservoir |
| CN115494163B (en) * | 2021-06-17 | 2024-05-14 | 中国石油化工股份有限公司 | System and method for determining gas-gas diffusion coefficient in gas reservoir |
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