High-temperature and high-pressure breakthrough pressure experiment device

Abstract

The utility model relates to a high-temperature and high-pressure breakthrough pressure experiment device. Comprising a displacement pump, a first piston container, a second piston container, a third piston container, a gas booster pump, a gas storage tank, a pressure regulating valve, a core holder, a bubble monitoring device, a back-pressure valve, a back-pressure pump, a confining pressure pump, a back-pressure pump, an image metering device, a first gas metering device, a second gas metering device, a third gas metering device, an electronic balance and a constant-temperature box, wherein the first piston container, the second piston container, the third piston container and the core holder are placed in a constant temperature box. According to the scheme of the utility model, the rock breakthrough pressure can be measured by simulating high-temperature and high-pressure conditions of a stratum, outlet bubbles can be automatically monitored under the high-temperature and high-pressure conditions, the automation degree is high, the automatic control of a process can be realized, the operation is simple and convenient, and time and labor are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of petroleum instruments, in particular to a high-temperature and high-pressure breakthrough pressure experiment device. Background Technique

[0002] The breakthrough pressure is the minimum pressure required for a non-lubricating wet-phase fluid to overcome the capillary pressure of the wet-phase fluid in a porous medium to form a continuous flowing phase. When the rock sample is saturated with a wetting fluid, the non-wetting fluid must overcome the capillary resistance of the rock to displace the wetting fluid. The smaller the capillary radius of the rock, the greater the resistance, and the higher the required breakthrough pressure.

[0003] By using a constant-temperature and pressure-increasing device and a core holder to simulate formation conditions, pressure is applied to the rock sample in the core holder, and the pressure at the inlet end of the rock sample is gradually increased. When the pressure causes the gas to form a continuous flowing phase in the rock sample, the corresponding pressure difference between the inlet and outlet ends is the breakthrough pressure. According to the Poiscuille formula, the time taken for the gas to cross from the bottom boundary to the top boundary of the caprock is calculated, which is the breakthrough time.

[0004] During the oil and gas exploitation process, being able to accurately know the breakthrough pressure of reservoir rocks is crucial for predicting reservoir productivity and formulating reasonable exploitation processes. However, there is currently no device that can accurately monitor the breakthrough pressure of cores under simulated formation temperature and formation pressure conditions. Although some laboratories are also conducting related tests, there are certain drawbacks, mainly concentrated in two aspects. One is that the bubble monitoring part cannot withstand high temperature and high pressure and cannot fully simulate formation temperature and pressure conditions for testing, resulting in large deviations in test results. The other is that automatic monitoring of microbubbles cannot be achieved, and manual observation is mainly used for bubble monitoring. Since the test time of this experiment is relatively long, the labor intensity of experimental personnel is greatly increased. Content of the Utility Model

[0005] The purpose of the utility model is to solve at least one technical problem in the background technique and provide a high-temperature and high-pressure breakthrough pressure experiment device.

[0006] To achieve the above purpose, the utility model provides a high-temperature and high-pressure breakthrough pressure experiment device, including: a displacement pump, a first piston container, a second piston container, a third piston container, a gas booster pump, a gas storage tank, a pressure regulating valve, a core holder, a bubble monitoring device, a back pressure valve, a back pressure pump, a confining pressure pump, a back pressure pump, an image metering device, a first gas metering device, a second gas metering device, a third gas metering device, an electronic balance, and a constant-temperature box; wherein, the first piston container, the second piston container, the third piston container, and the core holder are placed in the constant-temperature box;

[0007] The displacement pump is respectively connected to the bottoms of the first piston container, the second piston container, and the third piston container through a first metal pipeline;

[0008] The tops of the first piston container, the second piston container, and the third piston container are connected to the core holder inlet through a second metal pipeline;

[0009] The outlet of the gas booster pump is connected to the inlet of the gas storage tank, the outlet of the gas storage tank is connected to the inlet of the pressure regulating valve, and the outlet of the pressure regulating valve is connected to the core holder inlet through a metal pipeline;

[0010] The confining pressure pump is connected to the confining pressure port of the core holder through a metal pipeline, and the axial pressure pump is connected to the axial pressure interface of the core holder through a metal pipeline;

[0011] The outlet of the core holder is connected to the bubble monitoring device through a metal pipeline;

[0012] The outlet of the bubble monitoring device is connected to the inlet of the back pressure valve through a pipeline, the back pressure pump is connected to the upper interface of the back pressure valve through a metal pipeline, and the outlet of the back pressure valve is connected to the inlet of the image metering device;

[0013] The upper outlet of the image metering device is respectively connected to the first gas metering device, the second gas metering device, and the third gas metering device through pipelines; the lower outlet of the image metering device is connected to the top of the electronic balance through a pipeline.

[0014] According to one aspect of the present invention, the outlet of the displacement pump is connected to a first pressure sensor, a first pneumatic valve, a third pneumatic valve, a fifth pneumatic valve, and a seventh pneumatic valve through a metal pipeline. The first pneumatic valve, the third pneumatic valve, and the fifth pneumatic valve are respectively connected to the bottoms of the first piston container, the second piston container, and the third piston container through metal pipelines;

[0015] The upper parts of the first piston container, the second piston container, and the third piston container are respectively connected to a second pneumatic valve, a fourth pneumatic valve, and a sixth pneumatic valve through metal pipelines. The outlets of the second pneumatic valve, the fourth pneumatic valve, and the sixth pneumatic valve are all connected to the core holder inlet.

[0016] According to one aspect of the present invention, the outlet of the gas booster pump is connected to the gas storage tank. A pressure gauge is connected to the upper part of the gas storage tank, and a first manual valve is connected to the lower part. The outlet of the gas storage tank is connected to the inlet of the pressure regulating valve, the outlet of the pressure regulating valve is connected to a second manual valve, a first pressure sensor is connected between the pressure regulating valve and the second manual valve, and the second manual valve is connected to the inlet end of the core holder through a metal pipeline.

[0017] According to one aspect of the present invention, the confining pressure pump is connected to the confining pressure port of the core holder through a metal pipeline, and a second pressure sensor is connected between the pipeline connecting the confining pressure pump and the confining pressure interface of the core holder; the axial pressure pump is connected to the axial pressure interface of the core holder through a metal pipeline, and a third pressure sensor is connected between the pipeline connecting the axial pressure pump and the axial pressure interface of the core holder.

[0018] According to one aspect of the present utility model, the inlet end of the core holder is connected to a pipeline which is connected to the third manual valve, and the outlet of the third manual valve is connected to the outlet of the core holder; a fourth pressure sensor is connected to the inlet end of the holder, and another pipeline is connected to the eighth pneumatic valve and another pipeline is connected to the ninth pneumatic valve. The other outlet of the eighth pneumatic valve is connected to the fifth pressure sensor, and the other outlet of the ninth pneumatic valve is connected to the sixth pressure sensor.

[0019] According to one aspect of the present utility model, the outlet of the bubble monitoring device is connected to the fourth manual valve, and a fifth manual valve is installed between the bubble monitoring device and the fourth manual valve. The outlet of the fourth manual valve is connected to the inlet of the back pressure valve. The back pressure pump is connected to the upper interface of the back pressure valve through a metal pipeline, and the outlet of the back pressure valve is connected to the inlet of the image metering device.

[0020] According to one aspect of the present utility model, the upper outlet of the image metering device is divided into two pipelines, one is connected to the sixth manual valve and the other is connected to the seventh manual valve. The sixth manual valve is connected to the dryer. The outlet of the dryer is divided into three pipelines, one is connected to the tenth pneumatic valve, one is connected to the eleventh pneumatic valve, and one is connected to the twelfth pneumatic valve. The outlet of the tenth pneumatic valve is connected to the first gas metering device, the outlet of the eleventh pneumatic valve is connected to the second gas metering device, and the outlet of the twelfth pneumatic valve is connected to the third gas metering device; the bottom outlet of the camera metering device is connected to the eighth manual valve, and the outlet of the eighth manual valve and the outlet of the ninth manual valve are both connected to the top of the electronic balance.

[0021] According to the solution of the present utility model, through the bubble monitoring device and the camera metering device, the bubbles are automatically monitored, greatly reducing the labor intensity of the operator and improving the efficiency.

[0022] The present utility model performs displacement outlet metering through the image metering device, can withstand a temperature of 200 °C and a pressure greater than 30 MPa, and realizes high-temperature and high-pressure metering.

[0023] The present utility model is provided with a constant temperature box and a displacement system, which can realize the reduction of the core experiment temperature and improve the authenticity of the experiment reduction.

[0024] The present utility model can simulate the high-temperature and high-pressure conditions of the formation to measure the breakthrough pressure of the rock and automatically monitor the outlet bubbles under high-temperature and high-pressure conditions. It has a high degree of automation, can realize the automatic control of the process, is easy to operate, and saves time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematically shows the structural layout diagram of a high-temperature and high-pressure breakthrough pressure experiment device according to an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The content of the present utility model will now be described with reference to exemplary embodiments. It should be understood that the described embodiments are only for enabling those of ordinary skill in the art to better understand and thus implement the content of the present utility model, rather than implying any limitation on the scope of the present utility model.

[0027] As used herein, the term "comprising" and its variants are to be construed as open-ended terms meaning "including but not limited to". The term "based on" is to be construed as "at least partially based on". The terms "an embodiment" and "a kind of embodiment" are to be construed as "at least one embodiment".

[0028] Figure 1 Schematically showing the structural layout diagram of a high-temperature and high-pressure breakthrough pressure experimental device according to an embodiment of the present utility model. As Figure 1 shown, in this embodiment, the specific structure of the high-temperature and high-pressure breakthrough pressure experimental device includes:

[0029] A displacement pump 1, the outlet of which is connected to a first pressure sensor 2, a first pneumatic valve 3, a third pneumatic valve 7, a fifth pneumatic valve 10, and a seventh pneumatic valve 12 through a metal pipeline. The first pneumatic valve 3, the third pneumatic valve 7, and the fifth pneumatic valve 10 are respectively connected to the bottoms of a first piston container 4, a second piston container 6, and a third piston container 9 through metal pipelines. The upper parts of the first piston container 4, the second piston container 6, and the third piston container 9 are respectively connected to a second pneumatic valve 5, a fourth pneumatic valve 8, and a sixth pneumatic valve 11 through metal pipelines. The outlets of the second pneumatic valve 5, the fourth pneumatic valve 8, and the sixth pneumatic valve 11 are all connected to the inlet of a core holder 19. A seventh pressure sensor 17 is connected to the inlet end of the holder 19, and another pipeline is connected to a thirteenth pneumatic valve 13 and another pipeline is connected to a fourteenth pneumatic valve 15. The other outlet of the thirteenth pneumatic valve 13 is connected to an eighth pressure sensor 14, and the other outlet of the fourteenth pneumatic valve 15 is connected to a ninth pressure sensor 16.

[0030] The inlet pipeline interface of the gas booster pump 44 can be connected to the experimental gas, and the air compressor 42 is connected to the power air source interface of the gas booster pump 44 through an air pipe; the outlet of the gas booster pump 44 is connected to the gas storage tank 46. A pressure gauge 52 is connected to the upper part of the gas storage tank, and a first manual valve 47 (pressure relief valve) is connected to the lower part. The outlet of the gas storage tank 46 is connected to the inlet of the pressure regulating valve 48, and the outlet of the pressure regulating valve 48 is connected to the second manual valve 50. A first pressure sensor 49 is connected between the pressure regulating valve 48 and the second manual valve 50. The second manual valve 50 is connected to the inlet end of the core holder 19 through a metal pipeline. The confining pressure pump 51 is connected to the confining pressure port of the core holder 19 through a metal pipeline, and a second pressure sensor 52 is connected between the pipeline connecting the confining pressure pump 51 and the confining pressure interface of the core holder 19; the axial pressure pump 53 is connected to the axial pressure interface of the core holder 19 through a metal pipeline, and a third pressure sensor 54 is connected between the pipeline connecting the axial pressure pump 53 and the axial pressure interface of the core holder 19. A pipeline is connected from the inlet end of the core holder 19 to the third manual valve 18, and the outlet of the third manual valve 18 is connected to the outlet of the core holder 19; a fourth pressure sensor 24 is connected to the inlet end of the core holder 19, and another pipeline is connected to the eighth pneumatic valve 20 and another pipeline is connected to the ninth pneumatic valve 22. The other outlet of the eighth pneumatic valve 20 is connected to the fifth pressure sensor 21, and the other outlet of the ninth pneumatic valve 22 is connected to the sixth pressure sensor 23. The outlet of the core holder 19 is connected to the bubble monitoring device 25 through a metal pipeline. The outlet of the bubble monitoring device 25 is connected to the fourth manual valve 27, and a bypass valve - the fifth manual valve 26 is installed between the bubble monitoring device and the fourth manual valve 27. The outlet of the fourth manual valve 27 is connected to the inlet of the back pressure valve 29. The back pressure pump 28 is connected to the upper interface of the back pressure valve 29 through a metal pipeline. The outlet of the back pressure valve 29 is connected to the inlet of the image metering device 30. The upper outlet of the image metering device 30 is divided into two pipelines, one is connected to the sixth manual valve 31 and the other is connected to the seventh manual valve 32. The sixth manual valve 31 is connected to the dryer 35. The outlet of the dryer is divided into three pipelines, one is connected to the tenth pneumatic valve 36, one is connected to the eleventh pneumatic valve 38, and one is connected to the twelfth pneumatic valve 40. The outlet of the tenth pneumatic valve 36 is connected to the first gas metering device 37, the outlet of the eleventh pneumatic valve 38 is connected to the second gas metering device 39, and the outlet of the twelfth pneumatic valve 40 is connected to the third gas metering device 41; the bottom outlet of the camera metering device 30 is connected to the eighth manual valve 33, and the outlet of the eighth manual valve 33 and the outlet of the ninth manual valve 32 are simultaneously connected to the top of the electronic balance 34.

[0031] In this embodiment, the outlet of the core holder 19 is connected to the bubble monitoring device 25 through a metal pipeline. The main body part of the bubble monitoring device uses a metal outer cylinder, with a strip-shaped observation port 80 mm long and 5 mm wide opened on the opposite sides. The inside of the metal cylinder is a special high-temperature and high-pressure resistant glass tube, with a maximum pressure resistance greater than 100 MPa. An optical fiber sensor is installed outside the strip-shaped observation port, and the minimum resolution of this sensor can reach 0.01 mm.

[0032] In this embodiment, high, medium, and low range pressure sensors are respectively connected to the inlet end and the outlet end of the core holder 19. A pneumatic valve is connected to the front end of the medium and low range sensors. During the experiment, the test system can automatically switch to a suitable range pressure sensor for measurement according to the magnitude of the test pressure.

[0033] In this embodiment, an image metering device 30 is used for displacement outlet metering, which can accurately measure the volume of oil and water, with a resolution of 0.01 ml. The two ends of the image metering device 30 are provided with strip-shaped glass observation windows with a width of 4 mm. An adjustable brightness strip-shaped light source is installed on one side of the glass observation window, and an industrial camera is used on the other side to read the gas-liquid, gas-oil, or oil-water interface in real time, for measuring the volume of oil or water at the displacement outlet. The image metering device 30 can withstand a temperature of 200 °C and a pressure greater than 30 MPa.

[0034] According to the above solution of the present invention, as Figure 1 shown, before the experiment, first connect a nitrogen gas source to the inlet 43 of the gas booster pump 44, adjust the gas source pressure to a certain pressure, start the air compressor 42 to fill the air storage tank 46 with air, and at the same time observe the pressure gauge 45 until the pressure of the air storage tank is increased to a suitable pressure that can meet the test requirements. Then turn off the air compressor 42 and close the gas source at the inlet of the gas booster pump 44.

[0035] During the experiment, first fill the first piston container 4, the second piston container 6 or the third piston container 9 with a wetting medium, and load the saturated rock sample to be measured into the core holder 19. Start the confining pressure pump 51, set a certain tracking pressure difference to apply a certain confining pressure to the core holder, and ensure that the confining pressure is always greater than the displacement pressure. Open the third manual valve 18, open the fifth manual valve 26 and the fourth manual valve 27, start the confining pressure pump 51, design the confining pressure pump 51 as a pressure tracking mode, apply confining pressure to the core holder 19, make the confining pressure higher than the inlet pressure of the core holder 19 by a certain value to track the inlet pressure, start the displacement pump 1, open the upper and lower pneumatic control valves of the piston container filled with the wetting medium, and close the fifth manual valve 26 after continuous liquid flows out at the outlet of the fifth manual valve 26. Start the back pressure pump 28 to increase the back pressure to the required value of the experiment; when the outlet pressure of the holder reaches the back pressure, close the third manual valve 18, stop the displacement pump 1, and close the upper start control valve of the piston container. Open the second manual valve 50, adjust the pressure regulating valve 48, and according to the experimental requirements, adjust the inlet gas pressure of the core holder 19 so that the gas displaces the core with a certain pressure difference. At the same time, through the bubble monitoring device 25, automatically monitor whether there are bubbles at the outlet of the core holder 19. When no bubbles are monitored after displacement for a certain time, adjust the pressure regulating valve 48, and adjust the inlet gas pressure of the core holder 19 to the next pressure point according to the experimental requirements. During the experiment, the bubble monitoring device 25 will continuously monitor. If no bubbles are still monitored within the specified time, continue to adjust the pressure regulating valve 48 to adjust the inlet pressure of the core holder 19 to the next pressure point according to the experimental requirements. When bubbles come out at a certain pressure point, the signal light of the bubble monitoring device 25 changes from green to red, and at the same time automatically prompts the experimenter. When the bubble monitoring device monitors continuous bubbles, the experiment can be ended by clicking, and the device control software will automatically record the current pressure as the breakthrough pressure.

[0036] According to the above scheme of the present invention, the present invention uses a bubble monitoring device and a camera metering device for automatic bubble monitoring, greatly reducing the labor intensity of operators and improving efficiency.

[0037] The present invention performs displacement outlet metering through an image metering device, can withstand a temperature of 200 °C and a pressure greater than 30 MPa, and realizes high-temperature and high-pressure metering.

[0038] The present invention is provided with a constant temperature box and a displacement system, which can realize the reduction of the core experiment temperature and improve the authenticity of the experiment reduction.

[0039] The present invention can simulate the high-temperature and high-pressure conditions of the formation to measure the breakthrough pressure of the rock and automatically monitor the outlet bubbles under high-temperature and high-pressure conditions. It has a high degree of automation, can realize the automatic control of the process, is easy to operate, and saves time and effort.

[0040] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in terms of form and details without departing from the scope defined by the claims of the present invention.

Claims

1. High-temperature and high-pressure breakthrough pressure experimental device, characterized in that, Including: Displacement pump, first piston container, second piston container, third piston container, gas booster pump, gas storage tank, pressure regulating valve, core holder, bubble monitoring device, back pressure valve, back pressure pump, confining pressure pump, image metering device, first gas metering device, second gas metering device, third gas metering device, electronic balance and constant temperature oven; among them, the first piston container, the second piston container, the third piston container and the core holder are placed in the constant temperature oven; The displacement pump is respectively connected to the bottoms of the first piston container, the second piston container and the third piston container through a first metal pipeline; The tops of the first piston container, the second piston container and the third piston container are connected to the core holder inlet through a second metal pipeline; The outlet of the gas booster pump is connected to the inlet of the gas storage tank, the outlet of the gas storage tank is connected to the inlet of the pressure regulating valve, and the outlet of the pressure regulating valve is connected to the core holder inlet through a metal pipeline; The confining pressure pump is connected to the confining pressure port of the core holder through a metal pipeline, and the axial pressure pump is connected to the axial pressure interface of the core holder through a metal pipeline; The outlet of the core holder is connected to the bubble monitoring device through a metal pipeline; The outlet of the bubble monitoring device is connected to the inlet of the back pressure valve through a pipeline, the back pressure pump is connected to the upper interface of the back pressure valve through a metal pipeline, and the outlet of the back pressure valve is connected to the inlet of the image metering device; The upper outlet of the image metering device is respectively connected to the first gas metering device, the second gas metering device and the third gas metering device through pipelines; the lower outlet of the image metering device is connected to the top of the electronic balance through a pipeline.

2. The high-temperature and high-pressure breakthrough pressure experimental device according to claim 1, wherein The outlet of the displacement pump is connected to a first pressure sensor, a first pneumatic valve, a third pneumatic valve, a fifth pneumatic valve and a seventh pneumatic valve through a metal pipeline, and the first pneumatic valve, the third pneumatic valve and the fifth pneumatic valve are respectively connected to the bottoms of the first piston container, the second piston container and the third piston container through metal pipelines; The tops of the first piston container, the second piston container and the third piston container are respectively connected to a second pneumatic valve, a fourth pneumatic valve and a sixth pneumatic valve through metal pipelines, and the outlets of the second pneumatic valve, the fourth pneumatic valve and the sixth pneumatic valve are all connected to the core holder inlet.

3. The high-temperature and high-pressure breakthrough pressure experimental device according to claim 1, characterized in that, The outlet of the gas booster pump is connected to the gas storage tank, a pressure gauge is connected to the upper part of the gas storage tank, a first manual valve is connected to the lower part of the gas storage tank, the outlet of the gas storage tank is connected to the inlet of the pressure regulating valve, the outlet of the pressure regulating valve is connected to a second manual valve, a first pressure sensor is connected between the pressure regulating valve and the second manual valve, and the second manual valve is connected to the inlet end of the core holder through a metal pipeline.

4. The high-temperature and high-pressure breakthrough pressure experimental device according to claim 1, characterized in that, The confining pressure pump is connected to the confining pressure port of the core holder through a metal pipeline, and a second pressure sensor is connected between the pipeline connecting the confining pressure pump and the confining pressure interface of the core holder; the axial pressure pump is connected to the axial pressure interface of the core holder through a metal pipeline, and a third pressure sensor is connected between the pipeline connecting the axial pressure pump and the axial pressure interface of the core holder.

5. The high-temperature and high-pressure breakthrough pressure experimental device according to claim 1, characterized in that, The inlet end of the core holder is connected to a pipeline which is connected to the third manual valve, and the outlet of the third manual valve is connected to the outlet of the core holder; a fourth pressure sensor is connected to the inlet end of the holder, and there is another pipeline connected to the eighth pneumatic valve and another pipeline connected to the ninth pneumatic valve. The other outlet of the eighth pneumatic valve is connected to the fifth pressure sensor, and the other outlet of the ninth pneumatic valve is connected to the sixth pressure sensor.

6. The high-temperature and high-pressure breakthrough pressure experimental device according to claim 1, characterized in that The outlet of the bubble monitoring device is connected to the fourth manual valve, and a fifth manual valve is installed between the bubble monitoring device and the fourth manual valve. The outlet of the fourth manual valve is connected to the inlet of the back pressure valve. The back pressure pump is connected to the upper interface of the back pressure valve through a metal pipeline, and the outlet of the back pressure valve is connected to the inlet of the image metering device.

7. The high-temperature and high-pressure breakthrough pressure experimental device according to any one of claims 1-6, characterized in that, The upper outlet of the image metering device is divided into two pipelines, one is connected to the sixth manual valve and the other is connected to the seventh manual valve. The sixth manual valve is connected to the dryer. The outlet of the dryer is divided into three pipelines, one is connected to the tenth pneumatic valve, one is connected to the eleventh pneumatic valve, and one is connected to the twelfth pneumatic valve. The outlet of the tenth pneumatic valve is connected to the first gas metering device, the outlet of the eleventh pneumatic valve is connected to the second gas metering device, and the outlet of the twelfth pneumatic valve is connected to the third gas metering device; the bottom outlet of the camera metering device is connected to the eighth manual valve, and the outlets of the eighth manual valve and the ninth manual valve are simultaneously connected to the top of the electronic balance.

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