Gas-liquid separation meter, metering system, storage capacity parameter determination method and application

Abstract

The invention discloses a gas-liquid separation meter, a metering system, a storage capacity parameter determination method and application, the gas-liquid separation meter comprises a meter body and a separation cavity, and the meter body is provided with an inflow pipeline and an outflow pipeline which are respectively communicated with the separation cavity; the inflow pipeline is used for being externally connected with a core holder, and the outflow pipeline is used for being externally connected with a back pressure device and a gas flowmeter; the separation cavity comprises a first chamber and a second chamber, and the first chamber and the second chamber are communicated up and down to form the separation cavity of an O-shaped structure; the inflow pipeline is communicated with the first cavity, and the ratio of the width of the second cavity to the width of the first cavity is 1: 5-1: 7 in the axis direction of the inflow pipeline. The gas-liquid separation meter can be suitable for carrying out gas-liquid separation on gas-liquid mixed fluid separated out from a tested rock core under different temperature and pressure conditions, gas flow and liquid flow are effectively metered, and a basis is provided for researching gas production seepage mechanisms of underground reservoirs of different types of oil and gas reservoirs, reservoir pore space utilization characteristics and change rules.

Description

Technical Field

[0001] The present invention relates to the technical field of natural gas reservoir development, and in particular to a gas-liquid separation meter, a metering system, a method for determining storage capacity parameters and applications. Background Art

[0002] Before constructing a gas reservoir-type gas storage, it is necessary to fully understand the original physical properties of the gas reservoir, study the injection and production operation mechanism of the gas reservoir converted into a gas storage and its main influencing factors, especially the impact of gas and liquid flow rates on the gas storage capacity parameter indicators during the injection and production operation, so as to guide the optimization of the gas storage injection and production operation plan.

[0003] Taking porous gas storage as an example of common underground gas storage, the operation of multiple injection and production cycles of the existing underground gas storage group shows that the high-speed, large-flow injection and production, water invasion and other effects during the operation of the gas storage have a more obvious impact on the utilization effect of the gas-bearing pore volume. In addition, the reservoir properties are medium and the heterogeneity is strong. Although it has undergone multiple complete injection and production cycles, the expansion rate of the gas storage is slow and is far from reaching the designed working gas scale. Obviously, the reconstruction of underground gas storage using depleted gas reservoirs has its own particularity and complexity in terms of the formation mechanism of storage capacity and the law of change of injection and production capacity, which needs to be further strengthened.

[0004] Currently, some useful work has been conducted on injection and production experiments for gas reservoir-type gas storage, including research on injection and production simulation systems for depleted gas reservoirs. This research primarily uses simulations of the injection and production processes in gas storage to study the injection and production mechanisms during reservoir construction. However, there are deficiencies in the high-temperature, high-pressure gas-liquid separation and metering during these simulations. The injection and production operation of gas reservoir-type gas storage is influenced by multiple factors, including injection and production rates, operating pressure range, and water intrusion. Conventional gas reservoir development experimental methods are unable to simulate the reciprocating high-speed injection and production patterns of gas storage operations and their impact on reservoir construction and operating efficiency. Summary of the Invention

[0005] In order to meet the needs of studying the operation mechanism of high temperature, large pressure range and high-speed injection and production in gas reservoir-type gas storage reservoirs, so as to simulate the gas production process under the stable pressure conditions of the gas storage reservoir reservoir formation and effectively separate and measure the produced gas and produced liquid, the present invention proposes a gas-liquid separation meter, a metering system, a method for determining the storage capacity parameters and its application.

[0006] In a first aspect, an embodiment of the present invention provides a gas-liquid separation meter, which may include: a meter body and a separation chamber disposed in the meter body, the meter body being provided with an inlet pipe and an outlet pipe respectively connected to the separation chamber; the inlet pipe being used for external connection to a core holder, and the outlet pipe being used for external connection to a back pressure device and a gas flow meter;

[0007] When the gas-liquid separation meter is in use, the inflow pipeline is located below the outflow pipeline;

[0008] The separation chamber includes a first chamber and a second chamber, and the first chamber and the second chamber are connected up and down to form an O-shaped separation chamber; the inflow pipe is connected to the first chamber, and in the axial direction of the inflow pipe, the ratio of the width of the second chamber to the width of the first chamber is 1:5 to 1:7.

[0009] Optionally, along the axial direction of the inflow pipeline, the ratio of the width of the second chamber to the width of the first chamber is 1:5 to 1:6.

[0010] Optionally, the gas-liquid separation meter may further include: a pressure sensor provided on the meter body and communicating with the separation chamber;

[0011] When the gas-liquid separation meter is in use, the pressure sensor is located at the upper end of the meter body.

[0012] Optionally, the gas-liquid separation meter may further include: an infrared liquid level meter or a volume scale provided on a side surface of the meter body, wherein the infrared liquid level meter or the volume scale is close to the second chamber.

[0013] Optionally, the meter body is integrally injection-molded from a transparent material that is resistant to high temperatures and high pressures.

[0014] In a second aspect, an embodiment of the present invention provides a high-temperature and high-pressure gas-liquid separation and metering system, comprising: a constant temperature box, a core holder, a back pressure device, a gas flow meter, and the gas-liquid separation meter described in the first aspect;

[0015] The core holder, the back pressure device and the gas-liquid separation meter are located inside the thermostatic box; the core holder is connected to the inlet pipe of the gas-liquid separation meter, the back pressure device is connected to the outlet pipe of the gas-liquid separation meter, and the gas flow meter is connected to the exhaust pipe of the back pressure device;

[0016] The constant temperature box is used to simulate the ambient temperature of the formation; the core clamp is used to clamp the tested core; the back pressure device is used to control the pressure in the core clamp and the gas-liquid separation meter; the gas-liquid separation meter is used to separate the gas-liquid fluid precipitated from the tested core, and measure the liquid flow rate through the infrared liquid level meter or volume scale on the gas-liquid separation meter, and measure the gas flow rate through the gas flow meter.

[0017] Optionally, the system may also include: a monitoring and analysis device, which is electrically connected to the constant temperature box, the back pressure device, the gas flow meter and the gas-liquid separation meter, and issues control instructions and receives feedback data to analyze the gas flow rate of the produced gas and the liquid flow rate of the produced liquid of the tested core under different temperature and pressure conditions based on the feedback data.

[0018] In a third aspect, an embodiment of the present invention provides an application of the high-temperature and high-pressure gas-liquid separation and metering system of the second aspect in reservoir physical property parameter analysis.

[0019] In a fourth aspect, an embodiment of the present invention provides a method for determining a gas storage capacity parameter, which may include:

[0020] Carrying out gas-liquid separation and metering under different formation temperature and pressure conditions during the physical simulation of gas storage operation according to the high-temperature and high-pressure gas-liquid separation and metering system of the second aspect;

[0021] The results of formation gas-liquid separation measurement under different temperature and pressure conditions are used to analyze the spatial utilization characteristics and change laws during the construction and injection and production operation of the gas storage reservoir, so as to determine the impact of gas flow and liquid flow on the storage capacity parameters during the injection and production process.

[0022] Optionally, the method may further include: optimizing the gas production operation plan of the gas storage based on the formation gas-liquid separation measurement results under different temperature and pressure conditions.

[0023] The beneficial effects of the above technical solutions provided in the embodiments of the present invention include at least:

[0024] The embodiments of the present invention provide a gas-liquid separation meter, a metering system, a method for determining storage capacity parameters, and an application. The gas-liquid separation meter can be used to separate the gas-liquid mixed fluid precipitated in the tested core under different temperature and pressure conditions, and effectively measure the gas flow rate and liquid flow rate, providing a basis for studying the gas production and seepage mechanism of underground reservoirs of different types of oil and gas reservoirs, the utilization characteristics of reservoir pore space, and the change law.

[0025] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0026] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 Schematic diagram (cross-sectional view) of the structure of the gas-liquid separation meter provided in an embodiment of the present invention;

[0029] Figure 2 Schematic diagram (side view) of the structure of the gas-liquid separation meter provided in an embodiment of the present invention;

[0030] Figure 3 This is a structural diagram of a high-temperature and high-pressure gas-liquid separation and metering system provided in an embodiment of the present invention;

[0031] Among them, 1-gas-liquid separation meter; 2-core holder; 3-back pressure device; 4-gas flow meter; 5-constant temperature box; 6-monitoring and analysis device;

[0032] 11- meter body; 12- separation chamber; 13- inflow pipe; 14- outflow pipe; 15- pressure sensor; 16- volume scale; 121- first chamber; 122- second chamber; 31- exhaust pipe. DETAILED DESCRIPTION

[0033] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0034] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "far," "near," "front," and "back" and the like, indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0036] The inventors discovered that conventional experimental devices use conventional gas-liquid separation and metering. Such devices separate a single type of gas and liquid fluids, and the pressure and temperature ranges they control are limited, making it difficult to meet the needs of studying the high-temperature, large-pressure range, and high-speed injection and production operation mechanisms of gas reservoir-type gas storage. Therefore, there is an urgent need to develop a high-temperature and high-pressure gas-liquid separation and metering device. This device can be used to carry out gas-liquid separation and metering under formation temperature and pressure conditions during the physical simulation of gas storage operation, analyze the pore space utilization characteristics and change laws during the construction and injection and production operation of the gas storage, and study the influence of gas and liquid flow rates on storage capacity parameters during the injection and production process. In view of the above problems, the present invention is proposed to provide a gas-liquid separation meter, metering system, storage capacity parameter determination method and application that overcome the above problems or at least partially solve the above problems.

[0037] The embodiment of the present invention provides a gas-liquid separation meter, referring to Figure 1 and Figure 2 As shown, the gas-liquid separation meter 1 may include: a meter body 11 and a separation chamber 12 provided in the meter body 11, the meter body 11 is provided with an inlet pipe 13 and an outlet pipe 14 respectively connected to the separation chamber 12; Figure 3 As shown, the inflow pipe 13 is used to connect to the core holder 2, and the outflow pipe 14 is used to connect to the back pressure device 3 and the gas flow meter 4. When the gas-liquid separation meter 1 is in use, the inflow pipe 13 is located below the outflow pipe 14. The separation chamber 12 includes a first chamber 121 and a second chamber 122, and the first chamber 121 and the second chamber 122 are connected to each other up and down to form an O-shaped separation chamber 12. The inflow pipe 13 is connected to the first chamber 121, and in the axial direction of the inflow pipe 13, the ratio of the width of the second chamber 122 to the width of the first chamber 121 is 1:5 to 1:7.

[0038] In the embodiment of this method, the inventors have made innovative improvements to the existing separator in order to fully separate the gas-liquid fluid precipitated from the tested core and accurately measure the flow rate of the liquid. Under the action of gravity, the gas migrates upward and the liquid migrates downward to achieve the separation of the gas-liquid two-phase fluid. The separation chamber is divided into a first chamber and a second chamber of an O-type connecting structure, and the width of the first chamber is larger than the width of the second chamber. The gas-liquid mixed fluid flows into the first chamber for separation, and flows into the second chamber through the upper and lower connecting channels and reaches equilibrium in the second chamber. In this way, the oscillation generated by the gas-liquid mixed fluid in the separation process of the first chamber has limited effect on the second chamber, and the gas-liquid interface of the second chamber remains relatively stable, which is convenient for measuring the flow rate of the sucked liquid.

[0039] It should be noted that the outflow pipeline in this embodiment may be communicated with the first chamber or the second chamber, and this embodiment of the present invention does not specifically limit this.

[0040] The above-mentioned gas-liquid separation meter provided in the embodiment of the present invention can be used to separate the gas-liquid mixed fluid precipitated in the tested core under different temperature and pressure conditions, and effectively measure the gas flow and liquid flow, providing a basis for studying the gas production and seepage mechanism of underground reservoirs of different types of oil and gas reservoirs, the utilization characteristics and change laws of reservoir pore space.

[0041] In an optional embodiment, along the axial direction of the inflow pipe 13 , the ratio of the width of the second chamber 122 to the width of the first chamber 121 is 1:5 to 1:6.

[0042] In the embodiment of the present invention, the parameters of the first chamber and the second chamber are optimized multiple times, and a series of optimizations are performed on the above parameters while ensuring the deviation between the measured value and the actual value. Figure 1 As shown, in the embodiment of the present invention, the first chamber is located on the left, and the second chamber is located on the right. In the embodiment of the present invention, gas-liquid separation meters with different right and left widths of 1:2, 1:5, 2:11, 1:6, 1:7, and 1:10 are used to verify gas and liquid metering data. The verification results are shown in Tables 1 and 2 as follows:

[0043] Table 1 Basic data of gas flow rate changes in gas storage depletion production simulation

[0044]

[0045]

[0046] Table 2 Basic data of liquid flow rate changes in gas storage depletion gas production simulation

[0047]

[0048] The results of Tables 1 and 2 above show that when the ratio of the width of the second chamber to the width of the first chamber is between 1:5 and 1:7, the deviation between the gas and liquid metering test values ​​and the actual values ​​is within 5%, which meets the error requirements. More preferably, when the ratio of the width of the second chamber to the width of the first chamber is between 1:5 and 1:6, the test results are closer to the actual results and the test results are more accurate. Therefore, using a ratio within this range is more effective.

[0049] In another alternative embodiment, referring to Figure 1 and Figure 2As shown, the gas-liquid separation meter 1 may further include: a pressure sensor 15 provided on the meter body 11 and communicating with the separation chamber 12 ; when the gas-liquid separation meter 1 is in use, the pressure sensor 15 is located at the upper end of the meter body 11 .

[0050] The pressure sensor in this embodiment of the present invention is used to monitor the pressure of the gas-liquid fluid in the gas-liquid separation meter to simulate the gas-liquid fluid released from the core under test under different pressure conditions. As the fluid gradually flows out of the core holder, the pressure decreases. When the pressure drops to the pressure of the back-pressure device (which is connected to the gas-liquid separation meter and has the same pressure as the gas-liquid separation meter), the gas and liquid flow at the core holder outlet stops.

[0051] In another alternative embodiment, referring to Figure 1 and Figure 2 As shown, the gas-liquid separation meter 1 may further include an infrared level gauge or volume scale 16 disposed on the side of the meter body 11, the infrared level gauge or volume scale 16 being close to the second chamber 122. The level gauge or volume scale in this embodiment can facilitate reading the amount of liquid remaining in the separation chamber, thereby calculating the liquid flow rate.

[0052] In another optional embodiment, the meter body 11 of the gas-liquid separation meter 1 is integrally injection-molded from a high-temperature, high-pressure-resistant transparent material. In this embodiment, the meter body is integrally molded, preferably using a high-temperature, high-pressure-resistant transparent material, so that it can be used for simulation experiments in simulated high-temperature and high-pressure environments of formations. In specific implementations, artificial sapphire is preferably used.

[0053] The above-mentioned gas-liquid separation meter provided in the embodiment of the present invention can be used to carry out the separation and metering of gas and liquid under the formation temperature and pressure conditions during the physical simulation of gas production during the construction of the gas storage reservoir and cyclic injection and production operation. That is, by separating and metering the gas and liquid fluids during the displacement test, the gas and liquid seepage characteristics and influencing factors during the actual operation of the gas storage reservoir can be analyzed, and the influence of the gas and liquid flow rates during the operation of the gas storage reservoir on the storage capacity parameter indicators can be studied, providing a basis for the evaluation of storage capacity parameters and guiding the optimization design of the reservoir construction and operation plan.

[0054] Based on the same inventive concept, the present invention also provides a high-temperature and high-pressure gas-liquid separation metering system. Figure 3As shown, the system may include: a constant temperature box 5, a core holder 2, a back pressure device 3, a gas flow meter 4 and the above-mentioned gas-liquid separation meter 1; wherein the core holder 2, the back pressure device 3 and the gas-liquid separation meter 1 are located inside the constant temperature box 5; the core holder 2 is connected to the inlet pipe 13 of the gas-liquid separation meter 1, the back pressure device 3 is connected to the outlet pipe 14 of the gas-liquid separation meter 1, and the gas flow meter 4 is connected to the exhaust pipe 31 of the back pressure device 3; the constant temperature box 5 is used to simulate the ambient temperature of the formation; the core holder 2 is used to clamp the tested core; the back pressure device 3 is used to control the pressure in the core holder 2 and the gas-liquid separation meter 1; the gas-liquid separation meter 1 is used to separate the gas-liquid fluid precipitated from the tested core, and measure the liquid flow through the infrared liquid level meter or volume scale 16 on the gas-liquid separation meter 1, and measure the gas flow through the gas flow meter 4.

[0055] In this embodiment, the system operates as follows: a thermostat is used to heat the high-temperature, high-pressure gas-liquid separation and metering system to a predetermined experimental temperature, and the high-temperature, high-pressure gas and liquid fluids are separated and metered using a gas-liquid separation meter. During the experiment, a certain pressure exists in the gas and liquid fluids within the core holder (the holder outlet is connected to the inlet pipe of the gas-liquid separation meter). The pressure of the back-pressure device is set by a monitoring and analysis device (the inlet of the back-pressure device is connected to the outflow pipe of the gas-liquid separation meter). When the back-pressure device pressure setting value is lower than the core holder fluid pressure, the gas and liquid fluids within the core holder enter the inlet pipe of the gas-liquid separation meter and enter the bottom of the left side of the O-type separation chamber. Under the action of gravity, the gas migrates upward and the liquid migrates downward, achieving separation of the gas-liquid two-phase fluid. At the same time, due to the O-type connection structure of the separation chamber, the separated gas and liquid flow to the right side of the pipe and reach equilibrium, with some gas passing through the back-pressure device and exiting the system.

[0056] Because the O-type separation chamber is made of transparent material and the right-side pipe is located on the side of the separation meter and is exposed, the gas-liquid interface on the right side of the O-type separation chamber can be directly read through the side of the separation meter, indicating the scale value of the volume scale, thereby measuring the gas and liquid flow rate flowing out of the core holder at that moment. The left-side pipe of the O-type separation chamber is thicker than the right-side pipe, which can buffer the flow rate of the inflowing gas and liquid fluid. In comparison, the gas-liquid interface on the right-side pipe is relatively more stable, facilitating accurate reading of the gas-liquid volume scale. The pressure sensor is used to monitor the gas-liquid fluid pressure in the gas-liquid separation meter. As the fluid in the core holder gradually flows out, the fluid pressure in the core holder decreases. When the pressure drops to the pressure of the back pressure device, the gas and liquid flow at the core holder outlet stops.

[0057] The above-mentioned high-temperature and high-pressure gas-liquid separation and metering system provided in the embodiment of the present invention can, on the one hand, simulate the gas production process under the formation temperature and pressure conditions in the gas storage simulation experiment, and realize the separation and metering of the produced gas and liquid fluids during the experiment. On the other hand, the high-temperature and high-pressure gas-liquid separation and metering system can be used to study the gas production and seepage mechanism of underground reservoirs of various types of gas reservoirs, analyze the impact of gas and liquid flow characteristics on gas production efficiency of gas reservoirs, and optimize gas reservoir development and gas production operation plans. Thirdly, the system can simulate the impact of factors such as the physical properties and scale of different core models on depletion gas production. There are differences in the seepage capacity of different core models. The setting of the gas production pressure point should be appropriately adjusted according to the seepage capacity of the core model.

[0058] In another optional embodiment, the above system may further include: a monitoring and analysis device 6, which is electrically connected to the constant temperature box 5, the back pressure device 3, the gas flow meter 4 and the gas-liquid separation meter 1, and issues control instructions and receives feedback data to analyze the gas flow rate of the produced gas and the liquid flow rate of the produced liquid of the tested core under different temperature and pressure conditions based on the feedback data.

[0059] The monitoring and analysis device in this embodiment is used to control, monitor, and record various experimental data. This monitoring and analysis device can monitor and automatically control data, making the entire system applicable to different temperature ranges and pressure intervals. This solves the problem of measuring gas and liquid flow rates during gas extraction at different pressure levels at formation temperatures during indoor experiments at gas reservoirs and storage facilities.

[0060] In a specific example, in combination with Table 1 and Table 2 above, based on the gas production operation conditions of the gas reservoir and gas storage, the applicable temperature range of the system is 0-180°C, the pressure range is 0-70 MPa, and the pressure sensor measurement range is 0-70 MPa.

[0061] The specific process of the simulation experiment is described in detail below:

[0062] 1) Experimental preparation stage: The monitoring and analysis device 6 is used to set the experimental upper limit pressure, gas production operation lower limit pressure and other parameters of the gas production simulation.

[0063] 2) Gas reservoir and gas storage gas production simulation experiment stage:

[0064] First, the experimental system was heated to the predetermined experimental temperature of 90°C in a thermostat. The back-pressure device was set to an initial pressure of 30 MPa using a monitoring and analysis device. At this point, the fluid in the core holder was at an initial pressure of 30 MPa (the core holder outlet was connected to the inlet pipe c of the gas-liquid separator meter). The back-pressure device pressure was set to 28 MPa at the first predetermined pressure point (Tables 1 and 2). At this point, the set pressure was lower than the initial pressure of 30 MPa for the fluid in the core holder. A pathway was formed between the core holder outlet, the gas-liquid separator meter, and the back-pressure device. Gas production began, and the gas and liquid in the core holder flowed through this pathway into the gas-liquid separator meter for separation and metering. As the gas and liquid in the core holder gradually flowed out, the pressure of the gas and liquid fluids in the core holder gradually decreased. When the pressure dropped to 28 MPa, the gas and fluid in the core holder ceased flowing out, and gas production at the first pressure point ceased. In this process, core depletion gas production simulation experiments were carried out at pressure points of 26MPa, 24MPa, 22MPa, 20MPa and 18MPa under the control of the fluid back pressure device.

[0065] Based on the same inventive concept, an embodiment of the present invention further provides an application of the above-mentioned high-temperature and high-pressure gas-liquid separation and metering system in reservoir physical property parameter analysis.

[0066] Based on the same inventive concept, an embodiment of the present invention also provides a method for determining the storage capacity parameters of a gas storage reservoir, which may include the following steps: first, according to the above-mentioned high-temperature and high-pressure gas-liquid separation and metering system, gas-liquid separation and metering are carried out under different temperature and pressure conditions of the formation during the physical simulation of the gas storage reservoir operation; then, based on the gas-liquid separation and metering results of the formation under different temperature and pressure conditions, the spatial utilization characteristics and change laws during the construction and injection and production operation of the gas storage reservoir are analyzed to determine the influence of gas flow and liquid flow on the storage capacity parameters during the injection and production process.

[0067] In another optional embodiment, the above method may further include: optimizing the gas production operation plan of the gas storage reservoir based on the formation gas-liquid separation measurement results under different temperature and pressure conditions.

[0068] For the specific description and beneficial effects of the application of the above-mentioned high-temperature and high-pressure gas-liquid separation and metering system in the embodiment of the present invention in the analysis of reservoir physical property parameters and the method for determining the storage capacity parameters of the gas storage reservoir, please refer to the relevant description of the above-mentioned gas-liquid separation meter and the high-temperature and high-pressure gas-liquid separation and metering system, and the embodiment of the present invention will not be repeated here.

[0069] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. The present disclosure is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and variations may be made without departing from the scope of the present disclosure. The scope of the present disclosure is limited solely by the appended claims. Thus, to the extent such modifications and variations fall within the scope of the claims and their equivalents, the present disclosure is intended to include such modifications and variations.

Claims

1. A gas-liquid separation meter, characterized in that: include: A meter body and a separation chamber provided in the meter body, wherein the meter body is provided with an inlet pipe and an outlet pipe respectively connected to the separation chamber; the inlet pipe is used for external connection to a core holder, and the outlet pipe is used for external connection to a back pressure device and a gas flow meter; When the gas-liquid separation meter is in use, the inflow pipeline is located below the outflow pipeline; The separation chamber includes a first chamber and a second chamber, and the first chamber and the second chamber are connected up and down to form an O-shaped separation chamber; the inflow pipe is connected to the first chamber, and in the axial direction of the inflow pipe, the ratio of the width of the second chamber to the width of the first chamber is 1:5 to 1:

7.

2. The gas-liquid separation meter according to claim 1, characterized in that: Along the axial direction of the inflow pipeline, the ratio of the width of the second chamber to the width of the first chamber is 1:5 to 1:

6.

3. The gas-liquid separation meter according to claim 1, characterized in that: Also includes: a pressure sensor disposed on the meter body and in communication with the separation chamber; When the gas-liquid separation meter is in use, the pressure sensor is located at the upper end of the meter body.

4. The gas-liquid separation meter according to claim 1, characterized in that: Also includes: An infrared level meter or a volume scale is arranged on the side of the meter body, and the infrared level meter or the volume scale is close to the second chamber.

5. The gas-liquid separation meter according to any one of claims 1 to 4, characterized in that: The meter body is integrally injection-molded from a high-temperature-resistant and high-pressure-resistant transparent material.

6. A high-temperature and high-pressure gas-liquid separation and metering system, characterized in that: include: A constant temperature box, a core holder, a back pressure device, a gas flow meter and a gas-liquid separation meter as claimed in any one of claims 1 to 5; The core holder, the back pressure device and the gas-liquid separation meter are located inside the thermostatic box; the core holder is connected to the inlet pipe of the gas-liquid separation meter, the back pressure device is connected to the outlet pipe of the gas-liquid separation meter, and the gas flow meter is connected to the exhaust pipe of the back pressure device; The constant temperature box is used to simulate the ambient temperature of the formation; the core clamp is used to clamp the tested core; the back pressure device is used to control the pressure in the core clamp and the gas-liquid separation meter; the gas-liquid separation meter is used to separate the gas-liquid fluid precipitated from the tested core, and measure the liquid flow rate through the infrared liquid level meter or volume scale on the gas-liquid separation meter, and measure the gas flow rate through the gas flow meter.

7. The system according to claim 6, characterized in that Also includes: A monitoring and analysis device is electrically connected to the constant temperature box, the back pressure device, the gas flow meter and the gas-liquid separation meter, and issues control instructions and receives feedback data to analyze the gas flow rate of the produced gas and the liquid flow rate of the produced liquid of the tested core under different temperature and pressure conditions based on the feedback data.

8. Application of the high-temperature and high-pressure gas-liquid separation and metering system according to claim 6 or 7 in reservoir physical property parameter analysis.

9. A method for determining gas storage capacity parameters, characterized in that: include: The high-temperature and high-pressure gas-liquid separation and metering system according to claim 6 or 7 is used to carry out gas-liquid separation and metering under different formation temperature and pressure conditions during the physical simulation of gas storage operation; The results of formation gas-liquid separation measurement under different temperature and pressure conditions are used to analyze the spatial utilization characteristics and change laws during the construction and injection and production operation of the gas storage reservoir, so as to determine the impact of gas flow and liquid flow on the storage capacity parameters during the injection and production process.

10. The method according to claim 9, characterized in that Also includes: The gas production operation plan of the gas storage reservoir is optimized based on the formation gas-liquid separation measurement results under different temperature and pressure conditions.

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