High-temperature medium-low pressure foam performance testing device

Abstract

The invention discloses a high-temperature medium-low pressure foam performance testing device which comprises a simulation shaft made of a transparent material, the simulation shaft is divided into an oil pipe, a sleeve and an outer pipe which are sequentially and coaxially sleeved at intervals from inside to outside, and the bottom end of the oil pipe is provided with a gas dispersion head communicated with the sleeve; the upper end and the lower end of the oil pipe communicate with a foam collecting unit and an injection unit through outwards-extending pipelines correspondingly, the bottom end of the sleeve communicates with a pressurizing unit through an outwards-extending pipeline, and the upper end and the lower end of the outer pipe jointly communicate with a heating unit through pipelines. The high-temperature medium-low pressure foam performance testing device can simulate the production state of a gas well to the greatest extent when foam scrubbing agent evaluation is carried out, so that the accuracy of an evaluation result is ensured. Meanwhile, the foam form in a shaft can be observed in real time, the influence of the foam scrubbing agent under different pressure and temperature conditions can be explored, implementation of a gas field on-site process can be better guided, the effective rate of gas well measures is effectively improved, the process effect is improved, and gas well stable production and recovery efficiency improvement are facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of natural gas exploitation, and in particular relates to a high-temperature, medium- and low-pressure foam performance testing device. Background Art

[0002] During the development of natural gas, as the formation energy decreases, the gas production of the gas well gradually falls below the critical liquid-carrying flow rate, and the formation water in the wellbore cannot be discharged with the gas flow. Therefore, drainage and gas production measures are needed to assist the normal production of the gas well. The foam drainage and gas production process is a drainage and gas production process with low investment, fast results, and simple implementation. This process requires the use of a suitable foaming agent.

[0003] The foaming agent used for drainage and gas production must be evaluated to confirm that its performance meets the requirements of the gas well and will not cause harm to the gas well before it can be put into the well. At present, the more authoritative foaming agent detection methods mainly include the airflow method, the Ross-Miles method and the WaringBlender method. The latter two methods mainly test the foaming and foam stabilization capabilities of the foam and cannot simulate the actual application environment of the foaming agent; the airflow method can simulate the gas well foam drainage process, can evaluate the dynamic performance of the foam, and the test results are relatively accurate, but these methods are all foam performance evaluation methods at normal temperature and pressure, and cannot evaluate the performance of the foam under high temperature and pressure conditions.

[0004] In recent years, many documents have reported on foam performance evaluation devices under high temperature and pressure conditions, such as the high temperature and high pressure evaluation devices mentioned in Chinese patent numbers CN202228059 and CN203239304, which mainly use electric heating plates for heating, and the pipe wall is heated unevenly. The wellbore is connected by multiple small operating windows, and the inner wall is not smooth. When the foam passes through, it will cause bubble breakage, affecting the stability of liquid carrying performance and causing inaccurate test results; a foaming agent foaming performance and foam dynamic performance evaluation device mentioned in CN213689272 uses a heating device on the outer wall of the container to adjust the test temperature. Since the heating surface cannot completely cover the outer wall of the container, it causes uneven heating, and the temperature difference in the wellbore is large, which affects the foaming of the foaming agent. All the evaluation methods currently introduced cannot accurately simulate the actual wellbore and cannot accurately evaluate the dynamic performance of the foam. Summary of the invention

[0005] The purpose of the present invention is to provide a high-temperature, medium- and low-pressure foam performance testing device, which solves the problem that the existing device cannot accurately evaluate the performance of the foaming agent under a high-temperature and pressurized environment.

[0006] The technical solution adopted by the present invention is: a high-temperature, medium- and low-pressure foam performance testing device, including a simulated wellbore made of transparent material, the simulated wellbore is divided from the inside to the outside into an oil pipe, a casing and an outer pipe which are coaxially spaced in sequence, a gas dispersion head is opened at the bottom end of the oil pipe and connected to the casing, the upper and lower ends of the oil pipe are respectively connected to a foam collection unit and an injection unit through pipes extending outwards, the bottom end of the casing is connected to a pressurization unit through a pipe extending outwards, and the upper and lower ends of the outer pipe are commonly connected to a heating unit through a pipe.

[0007] The present invention is also characterized in that:

[0008] The foam collecting unit comprises a foam collector connected with the oil pipe, the top of the foam collector is sealed with a cover plate, the cover plate is connected with a pressure stabilizing valve, and an electronic balance is arranged below the bottom of the foam collector.

[0009] The injection unit comprises an injection pump connected with the oil pipe, and the other end of the injection pump is connected with a foaming agent solution storage tank.

[0010] The boosting unit comprises a pressure reducing valve connected to the casing, and the other end of the pressure reducing valve is connected to a high-pressure gas storage tank and an air compressor in sequence.

[0011] The heating unit comprises an oil storage tank, a temperature detector is arranged at the top end of the oil storage tank, a heating rod is arranged at the bottom end of the oil storage tank, and silicone oil and a plunger pump are arranged in the oil storage tank.

[0012] It also includes a control panel with a built-in controller, the control panel is electrically connected to a pressure sensor located in the casing, and a temperature sensor and an electronic flow meter located on the pressure reducing valve and the casing connecting pipeline, and a pressure display, a temperature display and a flow display are arranged on the control panel. The control panel is also electrically connected to an injection pump, an air compressor, a pressure regulating valve, a heating rod, a temperature detector and a plunger pump.

[0013] The control panel is also provided with an alarm linked with the temperature sensor and the pressure sensor.

[0014] The top of the oil pipe is connected to an AR pump and a water source in sequence through a pipe extending outwards, a spray head is arranged in the connecting pipe between the AR pump and the oil pipe, and the bottom of the oil pipe is connected to a waste liquid pool through a pipe extending outwards.

[0015] The beneficial effects of the present invention are as follows: the high-temperature, medium- and low-pressure foam performance testing device of the present invention can simulate the gas well production state to the greatest extent when carrying out the evaluation of the foaming agent, and ensure the accuracy of the evaluation result. At the same time, the foam morphology in the wellbore can be observed in real time, and the influence of the foaming agent under different pressure and temperature conditions can be explored, so as to better guide the implementation of the on-site process of the gas field, effectively improve the efficiency of the gas well measures, enhance the process effect, and be beneficial to the stable production of the gas well and improve the recovery rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a high-temperature, medium- and low-pressure foam performance testing device of the present invention;

[0017] Figure 2 It is a bottom view of a simulated wellbore in the high-temperature, medium- and low-pressure foam performance testing device of the present invention;

[0018] Figure 3 It is a schematic diagram of the installation position of the simulated wellbore in the high-temperature, medium- and low-pressure foam performance testing device of the present invention.

[0019] In the figure, 1. simulated wellbore, 2. sprinkler head, 3-1. valve I, 3-2. valve II, 3-3. valve III, 3-4. valve IV, 3-5. valve V, 3-6. valve VI, 4. pressure reducing valve, 5. high pressure gas storage tank, 6. air compressor, 7. temperature detector, 8. silicone oil, 9. oil storage tank, 10. heating rod, 11. injection pump, 12. foaming agent solution storage tank, 13. control panel, 14. temperature display Instrument, 15. Pressure display instrument, 16. Flow display instrument, 17. Alarm, 18. Electronic flow meter, 19. Temperature sensor, 20. Pressure regulating valve, 21. Foam collector, 22. Cover plate, 23. Fixing bolts, 24. Electronic balance, 25. AR pump, 26. Water source, 27. Waste liquid pool, 28. Oil pipe, 29. Casing, 30. Outer pipe, 31. Gas dispersion head, 32. Small round hole, 33. Wellbore support. DETAILED DESCRIPTION

[0020] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Example 1

[0022] The present invention provides a high temperature, medium and low pressure foam performance testing device, such as Figures 1 to 3 As shown, the simulated wellbore 1 is made of transparent material, and the simulated wellbore 1 is fixed in the wellbore support 33. The simulated wellbore 1 is divided from the inside to the outside into a tubing 28, a casing 29 and an outer tube 30 which are coaxially spaced and sleeved in sequence. The inner wall of the tubing 28 is smooth and can withstand a pressure of not less than 15 MPa. The inner diameter Thickness 48-55mm, integrally formed, high temperature resistance above 300℃, made of high temperature and high pressure resistant glass. Preferably, the aluminum silicate material with an aluminum silicate purity of not less than 98% has better performance than other materials; the inner wall of the sleeve 29 is smooth, the pressure bearing capacity is not less than 20MPa, and the inner diameter Thickness 55-60mm, integrally formed, high temperature resistance above 300℃, made of high temperature and high pressure resistant glass. Preferably, the aluminum silicate material with an aluminum silicate purity of not less than 99.5% has better performance than other materials; the inner wall of the outer tube 30 is smooth, transparent, and has a pressure resistance of not less than 5MPa, and the inner diameter Thickness 6 to 10 mm, temperature resistance above 250°C. Preferably, the material is super-strong tempered glass, the length of a single outer tube is 40 to 45 cm, and it is fixed by a stainless steel flange. A gas dispersion head 31 is provided at the bottom of the oil pipe 28 to communicate with the sleeve 29. The gas dispersion head 31 can be made of a 60-80 mesh sand core plate, or high temperature and high pressure resistant glass. Circular micropores are distributed in the middle, with a pore diameter of 3 to 4 mm and a micropore interval of 15 to 20 mm, which is easy to clean and maintain. The upper and lower ends of the oil pipe 28 are respectively connected to the foam collection unit and the injection unit through the pipes extending outwards, the bottom end of the sleeve 29 is connected to the booster unit through the pipe extending outwards, and the upper and lower ends of the outer pipe 30 are connected to the heating unit through the pipes connected by the circular small holes 32.

[0023] During the test, the booster unit provides pressurized gas into the casing 29, so that the casing 29 provides a pressurized environment simulating the wellbore 1; the heating unit provides a heating medium into the outer tube 30, so that the outer tube 30 provides a high-temperature environment simulating the wellbore 1. The outer tube 30 is not connected to the tubing 28 and the casing 29, and the annular channel between the outer tube 30 and the casing 29 is an oil bath channel, which can meet the temperature requirements of the wellbore from normal temperature to 220°C. After the pressure and temperature reach the set value, the injection unit injects the foaming agent solution into the tubing 28. The tubing 28 is the foam passage, simulating the foaming agent solution carrying channel. After the specified carrying time, the amount of the foaming agent solution collected by the foam collection unit is read, thereby judging and evaluating the foaming performance and foam dynamic performance of the foaming agent.

[0024] In the middle and late stages of gas well production, it is necessary to carry out drainage and gas production measures. Through process optimization, gas wells suitable for foam drainage and gas production processes need to be evaluated for the applicability of the foam drainage agent in combination with the gas and water production conditions of the gas wells to ensure the process effect. The foam drainage agent evaluation carried out by the present invention can simulate the production status of the gas well to the greatest extent and ensure the accuracy of the evaluation results. At the same time, the foam morphology in the wellbore can be observed in real time through the simulated wellbore 1 made of transparent material, and the influence of the foam drainage agent under different pressure and temperature conditions can be explored to better guide the implementation of the gas field field process, effectively improve the efficiency of gas well measures, enhance the process effect, and be beneficial to the stable production of gas wells and improve the recovery rate.

[0025] Example 2

[0026] In Example 1, the foam collecting unit, the injection unit, the pressurizing unit, and the heating unit of the present invention are preferably:

[0027] The foam collection unit includes a foam collector 21 connected to the oil pipe 28. The foam collector 21 is made of stainless steel, has a pressure resistance of 5 MPa and a temperature resistance of 200°C. The top of the foam collector 21 is sealed with a cover plate 22 by a fixing bolt 23. The cover plate 22 is connected to a pressure-stabilizing valve 20. An electronic balance 24 is arranged below the bottom of the foam collector 21 for reading the test results.

[0028] The injection unit includes an injection pump 11 connected to the oil pipe 28, and the other end of the injection pump 11 is connected to the foaming agent solution storage tank 12. The foaming agent solution needs to be prepared in advance according to the test needs and stored in the foaming agent solution storage tank 12. During the test, the injection pump 11 is used to provide pressure to pump it into the bottom of the oil pipe 28.

[0029] The booster unit includes a pressure reducing valve 4 connected to the casing 29, and the other end of the pressure reducing valve 4 is connected to a high-pressure gas storage tank 5 and an air compressor 6 in sequence. High-pressure gas is obtained through the air compressor 6 and stored in the high-pressure gas storage tank 5. During the test, the pressurized gas is output through the stainless steel pipe, controlled by the gas pressure reducing valve 4, and transported to the bottom of the annulus of the casing 29, and enters the annulus of the casing 29 and the oil pipe 28. When the pressure is insufficient, the air compressor 6 is started again, and the cycle operation is carried out to maintain the required pressure.

[0030] The heating unit includes an oil storage tank 9, and a temperature detector 7 is arranged at the top of the oil storage tank 9 for detecting the temperature of the oil bath. A heating rod 10 is arranged at the bottom of the oil storage tank 9 to adjust the temperature of the oil bath. Silicone oil 8 and a plunger pump are arranged in the oil storage tank 9, and the material of the silicone oil 8 is preferably a silicone oil substance. The silicone oil 8 is pumped out of the oil storage tank 9 by the plunger pump, enters the bottom of the outer tube 30, flows upward along the outer tube 30, flows out from the top of the outer tube 30, and returns to the oil storage tank 9 to realize a circulating flow.

[0031] Example 3

[0032] In Example 1, the present invention can also realize automatic control through a control unit, specifically: a control panel 13 with a built-in controller, the control panel 13 is electrically connected to a pressure sensor located in the sleeve 29, a temperature sensor 19 and an electronic flow meter 18 located on the pipe connecting the pressure reducing valve 4 and the sleeve 29, and a pressure display 15, a temperature display 14 and a flow display 16 are provided on the control panel 13. The control panel 13 is also electrically connected to the injection pump 11, the air compressor 6, the pressure regulating valve 20, the heating rod 10, the temperature detector 7 and the plunger pump. The control panel 13 is also provided with an alarm 17 linked to the temperature sensor 19 and the pressure sensor. When the temperature or pressure exceeds the set value, the alarm 17 is activated to remind the staff that the system status is abnormal.

[0033] Example 4

[0034] In Example 1, the present invention can also realize flushing of the pipe wall after the test is completed through a cleaning unit, specifically: the top of the oil pipe 28 is connected to the AR pump 25 and the water source 26 in sequence through a pipe extending outward, a spray head 2 is arranged in the connecting pipe between the AR pump 25 and the oil pipe 28, and the bottom of the oil pipe 28 is connected to the waste liquid pool 27 through a pipe extending outward. During flushing, the AR pump 25 pumps the cleaning water at the water source 26 into the oil pipe 28 of the simulated wellbore 1, and the spray head 2 can disperse the incoming water so that the pipe wall is evenly and effectively flushed, and the waste water flows out from the bottom of the oil pipe 28 to the waste liquid pool 27.

[0035] Example 5

[0036] The present invention is tested as follows: valve III3-3 is opened, and the control panel 13 controls the air compressor 6 to start filling the high-pressure gas storage tank 5 with compressed gas. After completion, the pressure reducing valve 4 is opened to pressurize the casing 29. The casing 29 is connected to the bottom of the oil pipe 28. The bottom of the oil pipe 28 is surrounded by a gas dispersion head 31, and the periphery is connected to the casing 29. High-pressure gas enters the interior of the oil pipe 28 from the gas dispersion head 31. The flow rate is set by the electronic flow meter 18, and the real-time pressure in the casing 29 is read by the pressure sensor. The flow display 16 and the pressure display 15 on the control panel 13 display the real-time flow and pressure values. After the set pressure is reached, the pressure reducing valve 4 is closed. At the same time, the control panel 13 controls the heating rod 10 in the oil storage tank 9 to start heating. After the temperature detector 7 detects that the silicone oil 8 is heated to a suitable temperature, the plunger pump starts, and the silicone oil 8 enters the simulated wellbore 1 from the bottom of the outer tube 30. The outer tube 30 is not connected to the oil pipe 28 and the casing 29. The silicone oil 8 passes through the circular hole 32 and returns to the oil storage tank 9 along the oil bath circulation pipeline at the upper part of the simulated wellbore 1 to realize the oil bath circulation. The real-time temperature of the silicone oil 8 entering the outer tube 30 is read by the temperature sensor 19. The temperature display 14 on the control panel 13 displays the real-time temperature. After reaching the set temperature, the heating rod 10 is turned off. In the above process, when the temperature or pressure exceeds the set value, the alarm 17 is activated to remind the staff that the system status is abnormal. After that, valve IV3-4, valve VI3-6 and valve II3-2 are opened, and the control panel 13 controls the injection pump 11 to pump the foaming agent solution prepared in advance according to the experimental needs in the foaming agent solution storage tank 12 into the oil pipe 28. After the specified liquid carrying time, the electronic balance 24 reads the weight change of the foam collector 21, thereby judging and evaluating the foaming performance and foam dynamic performance of the foaming agent. During the test, the high-pressure gas storage tank 5 can continuously provide pressurized gas. When the pressure is insufficient, it needs to be re-pressurized. There is no need to disconnect the test process in the middle. The pressure regulating valve 20 is mainly used to balance the pressure to ensure that the pressure of the simulated wellbore 1 is constant. If the actual pressure is higher than the set pressure, the pressure regulating valve 20 can realize automatic pressure relief. After the test is completed, valve I3-1 and valve V3-5 are opened, and the cleaning water at the water source 26 is pumped into the oil pipe 28 of the simulated wellbore 1 by the AR pump 25. The sprinkler head 2 can disperse the incoming water so that the pipe wall is evenly and effectively washed, and the wastewater flows out from the bottom of the oil pipe 28 to the waste liquid pool 27.

Claims

1. High temperature, medium and low pressure foam performance testing device, characterized in that: The simulated wellbore (1) comprises a transparent material. The simulated wellbore (1) is divided from the inside to the outside into an oil pipe (28), a casing (29) and an outer pipe (30) which are coaxially spaced and arranged in sequence. A gas dispersion head (31) is provided at the bottom end of the oil pipe (28) and is connected to the casing (29). The upper and lower ends of the oil pipe (28) are respectively connected to a foam collection unit and an injection unit through pipes extending outwards. The bottom end of the casing (29) is connected to a pressurizing unit through a pipe extending outwards. The upper and lower ends of the outer pipe (30) are connected to a heating unit through a pipe.

2. The high temperature, medium and low pressure foam performance testing device according to claim 1, characterized in that: The foam collecting unit comprises a foam collector (21) connected to an oil pipe (28); a cover plate (22) is sealed at the top of the foam collector (21); a pressure regulating valve (20) is connected to the cover plate (22); and an electronic balance (24) is arranged below the bottom of the foam collector (21).

3. The high temperature, medium and low pressure foam performance testing device according to claim 2, characterized in that: The injection unit comprises an injection pump (11) connected to an oil pipe (28), and the other end of the injection pump (11) is connected to a foaming agent solution storage tank (12).

4. The high temperature, medium and low pressure foam performance testing device according to claim 3, characterized in that: The boosting unit comprises a pressure reducing valve (4) connected to the sleeve (29), and the other end of the pressure reducing valve (4) is connected to a high-pressure gas storage tank (5) and an air compressor (6) in sequence.

5. The high temperature, medium and low pressure foam performance testing device according to claim 4, characterized in that: The heating unit comprises an oil storage tank (9), a temperature detector (7) is arranged at the top end of the oil storage tank (9), a heating rod (10) is arranged at the bottom end of the oil storage tank (9), and silicone oil (8) and a plunger pump are arranged in the oil storage tank (9).

6. The high temperature, medium and low pressure foam performance testing device according to claim 5, characterized in that: The control panel (13) also includes a controller installed therein. The control panel (13) is electrically connected to a pressure sensor located in the sleeve (29) and a temperature sensor (19) and an electronic flow meter (18) located on a pipeline connecting the pressure reducing valve (4) and the sleeve (29). The control panel (13) is provided with a pressure display (15), a temperature display (14) and a flow display (16). The control panel (13) is also electrically connected to an injection pump (11), an air compressor (6), a pressure regulating valve (20), a heating rod (10), a temperature detector (7) and a plunger pump.

7. The high temperature, medium and low pressure foam performance testing device according to claim 6, characterized in that: The control panel (13) is also provided with an alarm (17) linked to the temperature sensor (19) and the pressure sensor.

8. The high temperature, medium and low pressure foam performance testing device according to claim 1, characterized in that: The top end of the oil pipe (28) is connected to an AR pump (25) and a water source (26) in sequence through a pipe extending outwards; a spray head (2) is arranged in the connecting pipe between the AR pump (25) and the oil pipe (28); and the bottom end of the oil pipe (28) is connected to a waste liquid pool (27) through a pipe extending outwards.

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