Device and method for gas-water separation and flow measurement under high temperature and high pressure

Abstract

The application discloses a device and method for gas-water separation and flow metering under high temperature and high pressure, which comprises a dryer assembly, a high-pressure-resistant container, a pressure gauge and a timer; wherein the dryer assembly is arranged in multiple and is arranged in parallel, the parallel dryer assembly is connected with the high-pressure-resistant container, a drying agent is arranged in the dryer assembly, and the high-pressure-resistant container is provided with the pressure gauge; before gas-water separation, the high-pressure-resistant container is inflated until a preset pressure is reached. The device and method can separate gas and water under high temperature and high pressure and accurately meter the flow of the gas phase and the water phase.

Description

Technical Field

[0001] This invention relates to the field of oil extraction, and specifically to a device and method for gas-water separation and flow measurement under high temperature and high pressure. Background Technology

[0002] Gas-water two-phase flow curve testing or dynamic physical simulation experiments of water-bearing gas reservoir development require the separation of the gas and water phases from the core sample and the separate measurement of their flow rates. These experiments are typically conducted at atmospheric pressure at the outlet. The gas-water mixture is usually passed through a glass tube containing a desiccant at atmospheric pressure to adsorb the water phase. The flow rate of the water phase is calculated by weighing the change in the weight of the desiccant over different time periods. The flow rate of the dried gas is then measured using a gas mass flow meter. However, this method, because the clamp outlet is at atmospheric pressure, cannot simulate the actual development dynamics of a gas reservoir under high temperature and pressure, or the gas-water two-phase flow curve under high pressure. The challenge in conducting high-temperature, high-pressure gas-water two-phase flow curve testing or dynamic physical simulation experiments of water-bearing gas reservoirs under high temperature and high pressure lies in how to separate the gas-water mixture under high pressure and accurately measure the flow rates of the gas and water phases.

[0003] Existing high-temperature, high-pressure gas-water seepage experiments use a backpressure valve to raise the pressure downstream of the core holder, and then separate and measure the flow rate of the gas-water mixture flowing through the backpressure valve at atmospheric pressure. However, due to the large dead volume of the backpressure valve and significant pressure fluctuations, the measurement errors for the water and gas phase flow rates are substantial, failing to meet the accuracy requirements of the experiment. Summary of the Invention

[0004] To address the aforementioned problems, one of the objectives of this invention is to provide a device for gas-water separation and flow measurement under high temperature and high pressure. This device can separate gas and water under high temperature and high pressure and accurately measure the flow rates of the gas and water phases.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A device for gas-liquid separation and flow measurement under high temperature and high pressure includes a dryer assembly, a high-pressure resistant container, a pressure gauge, and a timer;

[0007] The dryer assembly is provided in multiple and arranged in parallel. The parallel dryer assembly is connected to a high-pressure resistant container. The dryer assembly is filled with desiccant, and the high-pressure resistant container is equipped with a pressure gauge.

[0008] Before gas-liquid separation, pressurize the high-pressure container with gas until the preset pressure is reached.

[0009] Preferably, the inlet of the dryer assembly is connected to the high-pressure gas-water mixture of the core production through a sampling tube; and the gas outlet of the dryer assembly is connected to the high-pressure resistant container through a gas outlet tube.

[0010] Preferably, a valve is arranged on the sampling tube and the gas outlet tube.

[0011] Preferably, the dryer assembly comprises a plug, a first nut cover, a cylinder, an inner mesh cylinder and a lower pressing cover.

[0012] The cylinder is provided with an inlet and a first gas outlet, and the inner mesh cylinder and the lower pressing cover are arranged in the cylinder, with the lower pressing cover arranged below the inner mesh cylinder and the second gas outlet arranged on the lower pressing cover.

[0013] The upper end of the inner mesh cylinder is open, the third gas outlet is arranged at the bottom end of the inner mesh cylinder, and the desiccant is arranged in the inner mesh cylinder.

[0014] The first nut cover comprises a first through hole and a first threaded hole, and the diameter of the first through hole is smaller than that of the first threaded hole.

[0015] The plug is provided with a feeding through hole communicating with the cylinder.

[0016] The plug is inserted into the cylinder from the upper end inlet of the cylinder, the first through hole of the first nut cover is sleeved on the outer wall of the plug, and the first threaded hole of the first nut cover is threadedly connected with the outer wall of the cylinder.

[0017] Preferably, the feeding through hole of the plug is a multi-section straight through hole, and the diameter of the straight through hole in the upper section is larger than that of the straight through hole in the lower section.

[0018] The first gas outlet of the cylinder is a multi-section straight through hole, and the diameter of the straight through hole in the upper section is smaller than that of the straight through hole in the lower section.

[0019] Preferably, the side wall of the plug is provided with an annular groove, and the first sealing ring is arranged in the annular groove, so that the plug and the inner part of the cylinder are sealingly connected.

[0020] Preferably, quick couplings are arranged at both ends of the dryer assembly, and the quick couplings are connected to both ends of the dryer assembly through pipes.

[0021] The quick couplings comprise a first coupling and a second coupling, and the first coupling and the second coupling are fixed together through a second nut cover; the first coupling is provided with a third through hole in the inside, the second coupling is provided with a fourth through hole and a groove in the inside, one end of the first coupling is inserted into the groove of the second coupling, and the third through hole and the fourth through hole are communicated.

[0022] Preferably, the material of the dryer assembly is titanium alloy.

[0023] To solve the above problems, the second object of the present application is to provide a method for separating gas and water under high temperature and high pressure and measuring the flow rate of the gas and water.

[0024] To achieve the above object, the present application provides the following technical solution.

[0025] A method for separating gas and water under high temperature and high pressure and measuring the flow rate of the gas and water, the specific steps are as follows:

[0026] Before separating the gas and water, the high-pressure container is filled with gas until the preset pressure is reached.

[0027] The high-pressure gas-water mixture produced by the core is introduced into the parallel dryer assemblies, the liquid phase in the high-pressure gas-water mixture is absorbed by the drying agent inside the dryer assemblies, and the gas phase in the high-pressure gas-water mixture flows out of the dryer assemblies and into the high-pressure container.

[0028] The time for the high-pressure gas-water mixture to enter and exit each dryer assembly and the change in the weight of the drying agent in each dryer assembly are measured, so as to calculate the flow rate of the water phase in different time periods and determine the change in the flow rate of the water phase over time.

[0029] The time and the pressure change of the pressure gauge are measured, and then the flow rate of the gas phase is calculated according to the gas Boyer equation.

[0030] Preferably, the gas used to fill the high-pressure container is one of nitrogen, methane, and carbon dioxide.

[0031] The present application has the following beneficial effects:

[0032] The device and method of the present application can separate gas and water under high temperature and high pressure and accurately measure the flow rate of the gas and water.

[0033] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art upon examination of the following or can be learned by practice of the present application. The objects and other advantages of the present application can be realized and attained by the structure particularly pointed out in the description and claims hereof as well as the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0035] Figure 1 The structural schematic diagram of the application is shown;

[0036] Figure 2 The structural schematic diagram of the dryer assembly is shown;

[0037] Figure 3 The structural schematic diagram of the quick connector is shown;

[0038] In the drawing marks: 10-dryer assembly, 11-end cap, 12-first nut cover, 13-barrel, 14-inner mesh barrel, 15-lower gland, 16-first sealing ring, 20-high pressure resistant container, 30-pressure gauge, 40-valve, 50-quick connector, 51-first connector, 52-second connector, 53-second nut cover, 54-second sealing ring. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the embodiments of the application more clear, the technical scheme in the embodiments of the application will be clearly and completely explained in combination with the drawings in the embodiments of the application. Obviously, the described embodiments are some embodiments of the application, not all the embodiments of the application. Based on the embodiments in the application, all the other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the application.

[0040] As shown in Figure 1 The application discloses a device for gas-water separation and flow measurement under high temperature and high pressure, which comprises a dryer assembly 10, a high pressure resistant container 20, a pressure gauge 30 and a timer.

[0041] The dryer assembly 10 is provided in plurality and arranged in parallel, and the parallel dryer assembly 10 is connected with the high pressure resistant container 20. The dryer assembly 10 is provided with a drying agent. The high pressure resistant container 20 is provided with the pressure gauge 30. Before gas-water separation, the high pressure resistant container 20 is inflated until a preset pressure is reached. The timer is used to record time.

[0042] The dryer assembly 10 and the high pressure resistant container 20 are provided, so that the gas and water can be separated under high temperature and high pressure. The weight of the drying agent in the dryer assembly 10 before and after weighing experiment is measured, so that the yield of the water phase is calculated, and the flow of the water phase is accurately calculated. The time and the pressure change of the pressure gauge 30 are measured, and then the flow of the gas phase is accurately calculated according to the gas Boyer equation.

[0043] Specifically, the inlet of the dryer assembly 10 is connected to the high-pressure gas-water mixture produced from the core sample via a sample inlet pipe; the outlet of the dryer assembly 10 is connected to the high-pressure resistant container 20 via an outlet pipe. Valves 40 are installed on both the sample inlet pipe and the outlet pipe.

[0044] The entry of the high-pressure gas-water mixture and the outflow of the gas phase in the high-pressure gas-water mixture are controlled by setting valves 40 in the sample inlet tube and the gas outlet tube.

[0045] As a preferred solution, such as Figure 1 As shown: When multiple dryer assemblies 10 are installed and connected in parallel to the high-pressure container 20, a valve 40 can be installed on the sample inlet tube at the inlet of each dryer assembly 10. In specific experiments, the valves 40 and the dryer assemblies 10 can be arranged in an orderly manner, and the valves 40 and the corresponding dryer assemblies 10 can be numbered to prevent misoperation and facilitate use.

[0046] During the experiment, the flow direction of the gas-water mixture can be controlled by opening and closing the valves 40 in front of different dryer components 10 in sequence, allowing the gas-water mixture to enter different dryer components 10 in sequence for gas-water separation. The water phase flow rate in each time period can be calculated by measuring the time and the change in weight of each dryer component 10 (containing desiccant) before and after the experiment. The gas phase flow rate can be calculated by the change in pressure of the high-temperature and high-pressure container over time.

[0047] Specifically, such as Figure 2 As shown: The dryer assembly 10 includes a plug 11, a first nut cover 12, a cylinder 13, an inner mesh cylinder 14, and a lower pressure cover 15;

[0048] The cylinder 13 is provided with an inlet and a first vent hole. An inner mesh cylinder 14 and a lower pressure cover 15 are provided inside the cylinder 13. The lower pressure cover 15 is located below the inner mesh cylinder 14, and a second vent hole is provided on the lower pressure cover 15.

[0049] The upper end of the inner mesh cylinder 14 is open, and the bottom end of the inner mesh cylinder 14 has a third air outlet. A desiccant is placed inside the inner mesh cylinder 14.

[0050] The first nut cap 12 includes a first through hole and a first threaded hole, wherein the diameter of the first through hole is smaller than the diameter of the first threaded hole;

[0051] The plug 11 is provided with a feed through hole that communicates with the cylinder 13;

[0052] The plug 11 is inserted into the cylinder 13 from the upper inlet. The first through hole of the first nut cover 12 is sleeved on the outer wall of the plug 11, and the first threaded hole of the first nut cover 12 is threadedly engaged with the outer wall of the cylinder 13.

[0053] By using the above-mentioned arrangement of the dryer assembly 10, the connection of each component in the dryer assembly 10 is reliable, the leakage of water and gas during the experiment is avoided, and the accuracy of the experimental results is improved. During the experiment, the gas-water mixture enters the inner mesh cylinder 14 through the feed-through hole of the plug 11 to contact the drying agent. After the drying agent absorbs the liquid phase in the gas-water mixture, the gas phase of the gas-water mixture passes through the third gas outlet hole of the inner mesh cylinder 14 and the second gas outlet hole of the lower gland 15 in turn, and finally is discharged from the first gas outlet hole of the cylinder body 13 to the high-pressure resistant container 20.

[0054] Preferably, the feed-through hole of the plug 11 is a multi-section straight-through hole, the hole diameter of the upper section is larger than that of the lower section; and the first gas outlet hole of the cylinder body 13 is a multi-section straight-through hole, the hole diameter of the upper section is smaller than that of the lower section. By using the above-mentioned arrangement, the feeding of the gas-water mixture and the discharge of the gas phase of the gas-water mixture are more stable and reliable.

[0055] Preferably, the side wall of the plug 11 is provided with an annular groove, and the first sealing ring 16 is arranged in the annular groove. The first sealing ring 16 realizes the sealed connection between the plug 11 and the inside of the cylinder body 13. By arranging the first sealing ring 16, the connection between the plug 11 and the cylinder body 13 is reliable, the leakage of the gas-water mixture is avoided, and the accuracy of the experimental results is improved.

[0056] Preferably, in order to quickly and conveniently install and dismount the drying tube, the sampling tube and the gas outlet tube, quick couplings 50 are arranged at both ends of the dryer assembly 10, and the quick couplings 50 are connected to both ends of the dryer assembly 10 through pipes.

[0057] Specifically, the structure of the quick coupling 50 is as shown in Figure 3 The quick coupling 50 includes a first coupling 51 and a second coupling 52, and the first coupling 51 and the second coupling 52 are fixed together through a second nut cover 53. The inside of the first coupling 51 is provided with a third through hole, the inside of the second coupling 52 is provided with a fourth through hole and a groove, one end of the first coupling 51 is inserted into the groove of the second coupling 52, and the third through hole and the fourth through hole are connected. By using the above-mentioned arrangement, the connection between the quick coupling 50 and the pipes at both ends is reliable and stable.

[0058] As a preferred local solution, the second nut cover 53 comprises a second through hole and a second threaded hole, the diameter of the second through hole is smaller than that of the second threaded hole, the second through hole is sleeved on the outer wall of the first joint 51, and the second threaded hole is threadedly connected with the outer wall of the second joint 52; the third through hole is a multi-section straight through hole, wherein the diameter of the straight through hole located at the upper section is larger than that of the straight through hole located at the lower section. The fourth through hole is a multi-section straight through hole, wherein the diameter of the straight through hole located at the upper section is smaller than that of the straight through hole located at the lower section. The outer wall of the first joint 51 is provided with a first limiting protrusion, and the outer wall of the second joint 52 is provided with a second limiting protrusion. The outer wall of the first joint 51 is provided with an annular groove, and the second sealing ring 54 is arranged in the annular groove, so that the outer wall of the first joint 51 and the inside of the second joint 52 are sealingly connected.

[0059] The third through hole and the fourth through hole are provided as multi-section straight through holes, the first convenient and rapid joint 50 is connected with the pipelines at both ends; the second makes the feeding and discharging more stable and reliable; the second sealing ring 54 is arranged, so that the first joint 51 and the second joint 52 are reliably connected, the leakage of the gas-water mixture is avoided, and the accuracy of the experimental results is improved.

[0060] Preferably, the material of the dryer assembly 10 is titanium alloy. The use of titanium alloy enables the dryer assembly 10 to withstand high pressure and prolong the service life of the dryer assembly 10.

[0061] A method for gas-water separation and flow measurement under high temperature and high pressure, and the specific steps are as follows:

[0062] Before gas-water separation, the high-pressure container 20 is filled with gas until the preset pressure is reached, and the gas used for filling is one of nitrogen, methane and CO2;

[0063] The high-pressure gas-water mixture produced by the core is introduced into the parallel dryer assemblies 10, the liquid phase in the high-pressure gas-water mixture is absorbed by the drying agent in the dryer assemblies 10, and the gas phase in the high-pressure gas-water mixture flows out of the dryer assemblies 10 into the high-pressure container 20;

[0064] The time for the high-pressure gas-water mixture to enter and exit each dryer assembly 10 and the change of the weight of the drying agent in each dryer assembly 10 are measured, so that the water phase flow in different time periods can be calculated, and the change of the water phase flow with time can be determined;

[0065] The time and the pressure change of the pressure gauge 30 are measured, and then the flow of the gas phase is calculated according to the gas Boyer equation, wherein the gas Boyer equation is V·P=C, V refers to the volume of the gas, P refers to the pressure, and C is a constant.

[0066] Through the above method, the gas-water mixture can be separated under high temperature and high pressure, and the flow rates of the gas phase and the water phase can be quickly and accurately measured; when multiple dryer assemblies 10 are provided, the flow rates of the water phase in different time periods can also be quickly measured.

[0067] Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood that modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent replacements can be made to some of the technical features, without departing from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for gas-liquid separation and flow measurement under high temperature and high pressure, characterized in that: The device includes a gas-water separation and flow metering device under high temperature and high pressure, which includes a dryer assembly (10), a high-pressure resistant container (20), a pressure gauge (30), and a timer. The dryer assembly (10) is provided in multiple and arranged in parallel. The parallel dryer assembly (10) is connected to the high pressure container (20). The dryer assembly (10) is provided with a desiccant. The high pressure container (20) is equipped with a pressure gauge (30). The specific steps are as follows: Before gas-liquid separation, pressurize the high-pressure resistant container (20) with gas until the preset pressure is reached; The high-pressure gas-water mixture produced from the core is introduced into a parallel dryer assembly (10). The liquid phase in the high-pressure gas-water mixture is absorbed by the desiccant inside the dryer assembly (10), and the gas phase in the high-pressure gas-water mixture flows out from the dryer assembly (10) and enters the high-pressure container (20). By measuring the time of high-pressure gas-water mixture entering and exiting each dryer component (10) and the change in the weight of desiccant in each dryer component (10), the water phase flow rate in different time periods can be calculated, and the change of water phase flow rate with time can be determined. The time and pressure change of the pressure gauge (30) are measured, and then the flow rate of the gas phase is calculated according to the Boyle equation for gas.

2. The method for gas-liquid separation and flow measurement under high temperature and high pressure according to claim 1, characterized in that... The inlet of the dryer assembly (10) is connected to the high-pressure gas-water mixture produced from the core through a sample inlet tube; the outlet of the dryer assembly (10) is connected to the high-pressure container (20) through an outlet tube.

3. The method for gas-liquid separation and flow measurement under high temperature and high pressure according to claim 2, characterized in that... Valves (40) are installed on both the sample inlet tube and the gas outlet tube.

4. A method for gas-liquid separation and flow measurement under high temperature and high pressure according to any one of claims 1-3, characterized in that... The dryer assembly (10) includes a plug (11), a first nut cap (12), a cylinder (13), an inner mesh cylinder (14), and a lower pressure cap (15). The cylinder (13) is provided with an inlet and a first air outlet. An inner mesh cylinder (14) and a lower pressure cover (15) are provided inside the cylinder (13). The lower pressure cover (15) is located below the inner mesh cylinder (14), and a second air outlet is provided on the lower pressure cover (15). The upper end of the inner mesh cylinder (14) is open, and the bottom end of the inner mesh cylinder (14) has a third air outlet. A desiccant is placed inside the inner mesh cylinder (14). The first nut cap (12) includes a first through hole and a first threaded hole, wherein the diameter of the first through hole is smaller than the diameter of the first threaded hole; The plug (11) is provided with a feed hole that communicates with the cylinder (13); The plug (11) is inserted into the cylinder (13) from the upper inlet. The first through hole of the first nut cap (12) is sleeved on the outer wall of the plug (11), and the first threaded hole of the first nut cap (12) is threadedly engaged with the outer wall of the cylinder (13).

5. The method for gas-water separation and flow measurement under high temperature and high pressure according to claim 4, characterized in that... The feed through hole on the plug (11) is a multi-segment straight through hole, and the diameter of the straight through hole in the upper segment is larger than the diameter of the straight through hole in the lower segment. The first air outlet of the cylinder (13) is a multi-segment straight through hole, and the diameter of the straight through hole in the upper segment is smaller than the diameter of the straight through hole in the lower segment.

6. The method for gas-liquid separation and flow measurement under high temperature and high pressure according to claim 4, characterized in that... The plug (11) has an annular groove on its side wall, and a first sealing ring (16) is provided in the annular groove. The first sealing ring (16) achieves a sealed connection between the plug (11) and the inside of the cylinder (13).

7. The method for gas-liquid separation and flow measurement under high temperature and high pressure according to claim 1, characterized in that... The dryer assembly (10) is provided with quick connectors (50) at both ends, and the quick connectors (50) are connected to the two ends of the dryer assembly (10) through pipes. The quick connector (50) includes a first connector (51) and a second connector (52), which are fixed together by a second nut cap (53). The first connector (51) has a third through hole inside, and the second connector (52) has a fourth through hole and a groove inside. One end of the first connector (51) is inserted into the groove of the second connector (52), and the third through hole and the fourth through hole are connected.

8. The method for gas-liquid separation and flow measurement under high temperature and high pressure according to claim 1, characterized in that... The dryer assembly (10) is made of titanium alloy.

9. The method for gas-water separation and flow measurement under high temperature and high pressure according to claim 1, characterized in that: The gas used to fill the high-pressure container (20) is one of nitrogen, methane, or carbon dioxide.

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