CN111537429A - Shale gas well shaft dynamic corrosion rate simulation measurement device and method - Google Patents
Shale gas well shaft dynamic corrosion rate simulation measurement device and method Download PDFInfo
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- CN111537429A CN111537429A CN202010435431.6A CN202010435431A CN111537429A CN 111537429 A CN111537429 A CN 111537429A CN 202010435431 A CN202010435431 A CN 202010435431A CN 111537429 A CN111537429 A CN 111537429A
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- 230000007797 corrosion Effects 0.000 title claims abstract description 49
- 238000005260 corrosion Methods 0.000 title claims abstract description 49
- 238000005259 measurement Methods 0.000 title claims abstract description 19
- 238000004088 simulation Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims description 12
- 239000007788 liquid Substances 0.000 claims description 94
- 238000002347 injection Methods 0.000 claims description 60
- 239000007924 injection Substances 0.000 claims description 60
- 238000011084 recovery Methods 0.000 claims description 22
- 238000000926 separation method Methods 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 4
- 230000003434 inspiratory effect Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000013589 supplement Substances 0.000 claims 9
- 238000000691 measurement method Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 87
- 239000012530 fluid Substances 0.000 description 13
- 230000008676 import Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 3
- 238000005485 electric heating Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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Abstract
The invention provides a shale gas well shaft dynamic corrosion rate simulation measurement device and a shale gas well shaft dynamic corrosion rate simulation measurement method. The invention can simulate the corrosion conditions of different parts of the gas well shaft more truly.
Description
Technical Field
The invention belongs to the technical field of petroleum and natural gas, and particularly relates to a shale gas well shaft dynamic corrosion rate simulation measurement device and method.
Background
In the shale gas reservoir development process, gas-liquid in a gas well shaft flows at a high speed and a large amount of corrosive media exist in the gas-liquid, so that the shaft is corroded, serious corrosion brings harm to the gas reservoir development, and the integrity of the gas well shaft and the safety of a gas well are brought with danger. Therefore, the corrosion rule of the shale gas well shaft needs to be mastered correctly, so that effective measures for inhibiting or slowing down the corrosion of the shaft are provided.
The fluid produced by the shale gas well shaft comprises shale gas and a produced fluid (a flowback fracturing fluid and formation water), the produced fluid is influenced by factors such as the injected fracturing fluid and the like, the property of the produced fluid is complex, and a large amount of bacteria are easily produced, so that the corrosion mechanism is complex. In addition, the flow speed of the fluid in the well bore of the gas well is far higher than that of the fluid in the well bore of the oil well, and a corrosion product film is not easy to form or has insufficient strength under the action of high-speed scouring of the fluid. The real gas well shaft corrosion rule cannot be truly embodied by utilizing the conventional corrosion rate measuring method. For example, the existing high-temperature high-pressure corrosion testing device realizes the relative motion of the hanging piece and the corrosion medium in a closed high-temperature high-pressure reaction kettle through the rotation of the stirring paddle, so as to simulate the flowing condition of fluid in an actual pipeline, but in some cases, the corrosion medium is not completely contacted with a pipeline, a gas well with accumulated liquid exists, the contact modes of different parts of the whole shaft and the produced fluid are different, and the conventional high-temperature high-pressure corrosion testing device cannot consider the condition.
At present, the conventional high-temperature high-pressure dynamic corrosion test has the following defects:
(1) the sealing performance of the high-temperature high-pressure reaction kettle cannot consider the difference caused by the corrosion of the pipeline in the fluid flowing process;
(2) the conventional equipment cannot simulate the influence of the contact relation between a corrosion medium in the reaction kettle and a pipeline on the corrosion rate;
(3) conventional devices fail to take into account the effects of gas phase flow on the rate of corrosion.
Disclosure of Invention
The invention aims to solve the technical problems and provides a device and a method for simulating and measuring the dynamic corrosion rate of a shale gas well shaft.
The technical scheme adopted by the invention for solving the technical problems is as follows: the shale gas well shaft dynamic corrosion rate simulation measuring device is characterized by comprising a liquid injection mechanism, a gas-liquid separation mechanism and a measuring mechanism, wherein the liquid injection mechanism and the gas injection mechanism are respectively connected with an inlet of the measuring mechanism, an outlet of the measuring mechanism is connected with an inlet of the gas-liquid separation mechanism, and a liquid outlet and an exhaust port of the gas-liquid separation mechanism are respectively connected with the liquid injection mechanism and the gas injection mechanism.
According to the above scheme, annotate the liquid mechanism and include the priming pump, annotate the liquid pipe, annotate liquid check valve and liquid recovery pipe, the export of annotating the liquid pump passes through annotate the liquid pipe and link to each other with measurement mechanism's import, annotate the liquid check valve and install on annotating the liquid pipe, the liquid outlet of gas-liquid separation mechanism passes through liquid recovery pipe links to each other with the import of annotating the liquid pump.
According to the above scheme, gas injection mechanism includes gas pitcher, gas injection pipe, gas recovery pipe and gas injection control assembly, the gas pitcher passes through the gas injection pipe with measuring mechanism links to each other, and the gas recovery pipe links to each other with gas injection pipe and measuring mechanism respectively, is equipped with the booster on the gas recovery pipe, gas injection control assembly includes gas injection pneumatic valve and pneumatic valve controller, the gas injection pneumatic valve is located respectively on gas injection pipe and the gas recovery pipe, pneumatic valve controller links to each other with the gas injection pneumatic valve.
According to the above scheme, measuring mechanism is for surveying the buret, survey the buret and comprise horizontal pipeline section, crooked pipeline section and vertical pipeline section, horizontal pipeline section and vertical pipeline section are surveyed the buret by pipe and corruption and are connected and form, crooked pipeline section is surveyed the buret for corroding.
According to the scheme, the air supply device further comprises an air supply mechanism, wherein the air supply mechanism comprises an air supply pump, an air supply pipe and an air supply pneumatic valve, the air supply pump is connected with the air tank through the air supply pipe, and the air supply pneumatic valve is arranged on the air supply pipe and connected with the pneumatic valve controller.
According to the scheme, the measuring pipe is externally coated with the heat insulation sleeve.
According to the above scheme, the pipe passes through flange joint with the corruption survey buret, and the junction is equipped with the sealing washer, and the pipe material is the same with the corruption survey buret, and inside and outside footpath size is the same.
According to the scheme, the gas tank is externally coated with the electric heating sleeve.
According to the scheme, the gas-liquid separation mechanism is a gas-liquid separator, and the air supplementing pump is a three-cylinder plunger pump.
The method for measuring by adopting the shale gas well shaft dynamic corrosion rate simulation measuring device is characterized by comprising the following steps:
utilize the liquid pump to pour into liquid into survey buret, liquid and corrosion pipe get into vapour and liquid separator after full contact, carry out gas-liquid separation after, liquid gets back to the liquid pump through liquid recovery pipe, realize the circulation of liquid, gaseous get back to the gas pitcher after passing through the booster pressure boost again, if gas circulation volume and pressure are not enough, promote the gaseous survey buret that gets into through the gas injection pipe that makes the gas pitcher of liquid pressurization by three jar plunger pumps, the gas pitcher passes through the control of pneumatic valve controller, form the inspiratory circulation state of gas injection, in order to guarantee gaseous circulation.
The invention has the beneficial effects that: the shale gas well shaft dynamic corrosion rate simulation measuring device and method can simulate the dynamic corrosion rate of a flowing process of gas well output fluid under different liquid carrying flows, more truly reflect the contact relation of different parts of a gas well shaft and the corrosion rule of high-speed airflow, and are simple in structure, easy to operate, safe and reliable.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
For a better understanding of the present invention, reference is made to the following description taken in conjunction with the accompanying drawings and examples.
As shown in fig. 1, the simulation measurement device for the dynamic corrosion rate of the shale gas well shaft comprises a liquid injection mechanism, a gas-liquid separation mechanism and a measurement mechanism, wherein the liquid injection mechanism and the gas injection mechanism are respectively connected with an inlet of the measurement mechanism, an outlet of the measurement mechanism is connected with an inlet of the gas-liquid separation mechanism, and a liquid outlet and an exhaust port of the gas-liquid separation mechanism are respectively connected with the liquid injection mechanism and the gas injection mechanism.
Annotate liquid mechanism and include notes liquid pump 1, annotate liquid pipe 2, annotate liquid check valve 3 and liquid recovery pipe 4, annotate the export of liquid pump and link to each other through annotating the import of liquid pipe with measuring mechanism, annotate the liquid check valve and install on annotating the liquid pipe, prevent liquid reflux, the liquid outlet of gas-liquid separation mechanism links to each other with the import of annotating the liquid pump through liquid recovery pipe, realizes liquid recovery cyclic utilization.
The gas injection mechanism includes gas pitcher 5, gas injection pipe 6, gas recovery pipe 7 and gas injection control assembly, the gas pitcher passes through the gas injection pipe and links to each other with measuring mechanism, the gas recovery pipe links to each other with gas injection pipe and measuring mechanism respectively, be equipped with booster 8 on the gas recovery pipe, gas injection control assembly includes gas injection pneumatic valve 9 and pneumatic valve controller 10, the gas injection pneumatic valve is located respectively on gas injection pipe and the gas recovery pipe, pneumatic valve controller links to each other with the gas injection pneumatic valve, the control gas pitcher is to the gas transmission of measuring mechanism.
Measuring mechanism is for surveying buret, surveys buret and comprises horizontal pipe section, crooked pipeline section and vertical pipe section, and horizontal pipe section and vertical pipe section are surveyed buret 12 by pipe 11 and corruption and are connected and constitute, and crooked pipeline section is surveyed buret for corroding, and each position of simulation pit shaft is measured, corrodes the detachable installation of surveying buret, conveniently takes out to measure and repacks.
Still include tonifying qi mechanism, tonifying qi mechanism includes tonifying qi pump 13, tonifying qi pipe 14 and tonifying qi pneumatic valve 15, and the tonifying qi pump passes through the tonifying qi pipe and links to each other with the gas pitcher, and the tonifying qi pneumatic valve is located on the tonifying qi pipe, links to each other with the pneumatic valve controller, and gas circulation volume and pressure are not enough, and the gas that promotes liquid pressurization by the tonifying qi pump makes the gas pitcher gets into through the gas injection pipe and surveys buret.
The measuring tube is covered with a thermal insulation sleeve 16 to keep the temperature of the liquid flow in the measuring tube.
The conduit and the corrosion measuring pipe are connected through a flange 17, a sealing ring is arranged at the joint, the conduit and the corrosion measuring pipe are made of the same material, and the inner diameter and the outer diameter of the conduit are the same.
The gas tank has two gas tanks, the volume of each gas tank is 20L, the pressure resistance is 40MPa, the gas tanks are externally coated with an electric heating sleeve 18 for heating, the maximum temperature is 180 ℃, and the temperature control precision is 1 ℃.
The gas-liquid separation mechanism is a gas-liquid separator 19, the air supplementing pump is a three-cylinder plunger pump, the highest pressure resistance is 40MPa, the pump speed is adjusted through a motor, the pressure and the flow speed are provided for the air tank, and the experimental flow speed is determined by the actual flow speed of gas produced by the actual shale gas well shaft.
The method for measuring by adopting the simulation measuring device comprises the following steps:
utilize the liquid pump to pour into liquid into survey buret, liquid and corrosion pipe get into vapour and liquid separator after full contact, carry out gas-liquid separation back, liquid gets back to the liquid pump through liquid recovery pipe, realizes the circulation of liquid, and gaseous get back to the gas pitcher after passing through the booster pressure boost again, gets into the pipe, if the gas circulation volume is not enough, by three jar plunger pumps to gas pitcher make-up gas, the gas pitcher passes through the control of pneumatic valve controller, forms the inspiratory circulation state of gas injection to guarantee gaseous circulation.
And (3) according to the data parameters of gas produced by the actual shale gas well shaft: CO in gas2The content is 0.686%, and the gas flow is 450m3Flow rate of liquid 0.22 m/h3For example,/h, the actual measurement results of the present invention are shown in the following table:
Claims (10)
1. the shale gas well shaft dynamic corrosion rate simulation measuring device is characterized by comprising a liquid injection mechanism, a gas-liquid separation mechanism and a measuring mechanism, wherein the liquid injection mechanism and the gas injection mechanism are respectively connected with an inlet of the measuring mechanism, an outlet of the measuring mechanism is connected with an inlet of the gas-liquid separation mechanism, and a liquid outlet and an exhaust port of the gas-liquid separation mechanism are respectively connected with the liquid injection mechanism and the gas injection mechanism.
2. The shale gas well shaft dynamic corrosion rate simulation measuring device as claimed in claim 1, wherein the injection mechanism comprises an injection pump, an injection pipe, an injection check valve and a liquid recovery pipe, an outlet of the injection pump is connected with an inlet of the measuring mechanism through the injection pipe, the injection check valve is installed on the injection pipe, and a liquid outlet of the gas-liquid separation mechanism is connected with an inlet of the injection pump through the liquid recovery pipe.
3. The shale gas well wellbore dynamic corrosion rate simulation measuring device as claimed in claim 1 or 2, wherein the gas injection mechanism comprises a gas tank, a gas injection pipe, a gas recovery pipe and a gas injection control assembly, the gas tank is connected with the measuring mechanism through the gas injection pipe, the gas recovery pipe is respectively connected with the gas injection pipe and the measuring mechanism, a supercharger is arranged on the gas recovery pipe, the gas injection control assembly comprises a gas injection pneumatic valve and a gas valve controller, the gas injection pneumatic valve is respectively arranged on the gas injection pipe and the gas recovery pipe, and the gas valve controller is connected with the gas injection pneumatic valve.
4. The shale gas well wellbore dynamic corrosion rate analog measurement device as claimed in claim 3, wherein the measurement mechanism is a measurement tube, the measurement tube is composed of a horizontal tube section, a curved tube section and a vertical tube section, the horizontal tube section and the vertical tube section are both composed of a conduit and a corrosion measurement tube connected, and the curved tube section is a corrosion measurement tube.
5. The shale gas well wellbore dynamic corrosion rate simulation measuring device as claimed in claim 3 further comprising an air supplement mechanism, wherein the air supplement mechanism comprises an air supplement pump, an air supplement pipe and an air supplement pneumatic valve, the air supplement pump is connected with the air tank through the air supplement pipe, and the air supplement pneumatic valve is arranged on the air supplement pipe and connected with the pneumatic valve controller.
6. The simulated measurement device of the dynamic corrosion rate of the shale gas well wellbore as recited in claim 4 wherein said measurement pipe is externally covered with a thermal jacket.
7. The shale gas well shaft dynamic corrosion rate simulation measuring device as claimed in claim 4, wherein the conduit and the corrosion measuring tube are connected through a flange, a sealing ring is arranged at the joint, the conduit and the corrosion measuring tube are made of the same material, and the inner diameter and the outer diameter of the conduit and the corrosion measuring tube are the same.
8. The shale gas well wellbore dynamic corrosion rate analog measurement device as claimed in claim 4 wherein the gas canister is externally coated with an electrical heating jacket.
9. The shale gas well wellbore dynamic corrosion rate simulation measuring device as claimed in claim 5, wherein the gas-liquid separation mechanism is a gas-liquid separator, and the gas make-up pump is a three-cylinder plunger pump.
10. The method for measuring by adopting the shale gas well shaft dynamic corrosion rate simulation measuring device is characterized by comprising the following steps:
utilize the liquid pump to pour into liquid into survey buret, liquid and corrosion pipe get into vapour and liquid separator after full contact, carry out gas-liquid separation after, liquid gets back to the liquid pump through liquid recovery pipe, realize the circulation of liquid, gaseous get back to the gas pitcher after passing through the booster pressure boost again, if gas circulation volume and pressure are not enough, promote the gaseous survey buret that gets into through the gas injection pipe that makes the gas pitcher of liquid pressurization by three jar plunger pumps, the gas pitcher passes through the control of pneumatic valve controller, form the inspiratory circulation state of gas injection, in order to guarantee gaseous circulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010435431.6A CN111537429A (en) | 2020-05-21 | 2020-05-21 | Shale gas well shaft dynamic corrosion rate simulation measurement device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010435431.6A CN111537429A (en) | 2020-05-21 | 2020-05-21 | Shale gas well shaft dynamic corrosion rate simulation measurement device and method |
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| CN111537429A true CN111537429A (en) | 2020-08-14 |
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2020
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Application publication date: 20200814 |