A two-phase flow meter comparison test system and method for shale gas

Abstract

The application discloses a two-phase flowmeter comparison test system and method for shale gas, which comprises a first two-phase flowmeter test section for installing a measured two-phase flowmeter, a gas-liquid two-phase flow separation unit for separating gas-liquid two-phase fluid into a single gas phase and a single liquid phase, a gas phase flowmetering unit for measuring the flow of the gas phase, a liquid phase storage unit for storing the separated liquid phase or a liquid phase for test in advance, a first liquid phase flowmetering unit for measuring the flow of the separated liquid phase, and a second liquid phase flowmetering unit for measuring the flow of the liquid phase injected into a test position upstream of the flowmeter test section. The two-phase flowmeter comparison test system and method can carry out comparison test and periodical calibration of two-phase flowmeters under different actual working conditions of shale gas wellheads, and can adapt to test under various fluid conditions, and can carry out test of two-phase flowmeters when the incoming fluid is single-phase gas or gas-liquid two-phase flow.

Description

Technical Field

[0001] This invention relates to the field of wet natural gas two-phase flow measurement technology, and more specifically, to a two-phase flow meter comparison and testing system and method for shale gas. Background Technology

[0002] The application of wet natural gas two-phase flow meters can optimize and simplify the surface process of shale gas development, significantly reducing the surface construction costs. With the large-scale exploration and development of shale gas, the demand for wet natural gas two-phase flow meters is constantly increasing. How to effectively evaluate the accuracy of wet natural gas two-phase flow meters at shale gas wellheads, and how to conduct periodic field tests and calibrations of wet natural gas two-phase flow meters for shale gas applications, are technical issues that need to be addressed for the widespread application of wet natural gas two-phase flow meters in shale gas.

[0003] Currently, the testing and evaluation of wet natural gas two-phase flow meters mainly involves users sending the flow meters to metrology institutions with testing capabilities, where their performance is tested using laboratory two-phase flow experimental testing equipment. However, there are very few metrology institutions with the capability to conduct wet natural gas two-phase flow experimental testing, making it difficult to meet the testing needs for the large-scale application of wet gas flow meters in shale gas. Furthermore, due to the wide range of wellhead operating conditions during shale gas production and development, and the significant differences in gas and gas conditions at wellheads across different shale gas blocks, laboratory two-phase flow testing equipment cannot fully simulate the wellhead operating conditions such as pressure and gas-liquid ratio. Therefore, the accuracy of two-phase flow meters tested in the laboratory may differ in the field. Therefore, there is an urgent need for a two-phase flowmeter testing and comparison device and a matching comparison testing method that can be applied to different shale gas wellhead sites. This device can test and evaluate the adaptability, stability and field performance of the two-phase flowmeter under actual field conditions. It can also perform periodic field testing and calibration of wet gas flowmeters for shale gas, thereby solving the technical problems of field testing and calibration of two-phase flowmeters in shale gas wellhead applications.

[0004] In view of the above, this application is hereby submitted. Summary of the Invention

[0005] To overcome the defects and shortcomings of existing technologies, this invention provides a new comparative testing system and method for two-phase flowmeters used in shale gas. This system enables comprehensive evaluation of the metering performance of gas-liquid two-phase flowmeters at the shale gas wellhead. It is adaptable to testing under various fluid conditions, allowing testing of two-phase flowmeters when the incoming fluid is either single-phase gas or gas-liquid two-phase flow. Furthermore, it provides passive comparison mode, active comparison mode, and rapid calibration mode to meet diverse on-site testing and comparison needs of two-phase flowmeters, based on different on-site operating conditions and testing requirements.

[0006] This invention is achieved through the following technical solution:

[0007] A two-phase flow meter comparison testing system for shale gas includes components arranged sequentially along the flow direction of the test fluid:

[0008] The first two-phase flow meter test section is used to install the two-phase flow meter under test or a straight fluid pipe; the gas-liquid two-phase flow separation unit is used to separate the gas-liquid two-phase fluid flowing through the first two-phase flow meter test section into a separate gas phase and a separate liquid phase; the gas phase flow metering unit is used to measure the flow rate of the separated gas phase; the liquid phase storage unit is used to store the separated liquid phase or pre-store the test liquid phase; the first liquid phase flow metering unit is used to measure the flow rate of the separated liquid phase; the second liquid phase flow metering unit is connected in parallel with the first liquid phase flow metering unit and is used to measure the flow rate of the test liquid phase injected into the upstream test position of the flow meter test section.

[0009] Another specific implementation includes a second two-phase flow meter test section located at the rear end of the gas phase flow metering unit and the second liquid phase flow metering unit. When the first two-phase flow meter test section is equipped with a fluid straight pipe, the second two-phase flow meter test section is equipped with the two-phase flow meter to be measured.

[0010] In another specific implementation, a flow regulation bypass diversion unit is also provided upstream of the first two-phase flow meter test section. The flow regulation bypass diversion unit includes a first valve regulation unit and a bypass regulation valve, which is used to regulate the flow rate of the single-phase gas or gas-liquid two-phase fluid used for testing.

[0011] In another specific embodiment, a liquid phase pumping system is provided between the second liquid phase flow metering unit and the liquid phase storage unit. The liquid phase pumping system is used to inject the liquid stored in the liquid phase storage unit into the upstream test position of the flow meter test section.

[0012] In another specific implementation, when it is necessary to perform performance testing on the two-phase flow meter under test, the two-phase flow meter under test is installed in the first two-phase flow meter test section, and a fluid straight pipe is installed in the second two-phase flow meter test section; when it is necessary to calibrate the two-phase flow meter under test, a fluid straight pipe is installed in the first two-phase flow meter test section, and the two-phase flow meter under test is installed in the second two-phase flow meter test section.

[0013] In another specific implementation, the first two-phase flow meter test section or the second two-phase flow meter test section can be equipped with multiple two-phase flow meters to be tested installed in series or in parallel, and each two-phase flow meter to be tested is equipped with a switching bypass.

[0014] In another specific embodiment, the liquid storage unit is equipped with a liquid level control system and a liquid discharge control system, which can measure the stored liquid and control the amount of stored liquid through the liquid level control system.

[0015] The two-phase flowmeter comparison and testing system of this invention can conduct comparison tests and periodic calibrations of two-phase flowmeters under different actual working conditions at shale gas wellheads. It is adaptable to testing under various fluid conditions, and can be used to test two-phase flowmeters when the incoming fluid is single-phase gas or gas-liquid two-phase flow. It can partially adjust the gas phase flow rate and liquid phase flow rate of gas-liquid two-phase flow under various different field working conditions at shale gas wellheads, greatly improving the testing and evaluation efficiency of two-phase flowmeters for shale gas and solving the technical problems of field performance evaluation and periodic testing of two-phase flowmeters for shale gas. At the same time, the testing system of this invention can switch to a passive comparison testing mode to test the long-term metrological performance of two-phase flowmeters in field applications, or to an active auxiliary testing mode to quickly test the metrological performance of two-phase flowmeters under various field working conditions, or to a rapid calibration mode to quickly test and calibrate the performance of two-phase flowmeters.

[0016] The following details the testing methods of the present invention's testing system under different modes:

[0017] (1) When it is necessary to perform a metering performance test on the two-phase flowmeter under test and the incoming fluid is a gas-liquid two-phase fluid, the test system of the present invention adopts a passive comparison test mode. In this mode,

[0018] This invention discloses a comparative testing method for two-phase flow meters used in shale gas, comprising the following steps:

[0019] 1) Install the two-phase flow meter under test in the first two-phase flow meter test section, and install the fluid straight pipe in the second two-phase flow meter test section;

[0020] 2) The test gas-liquid two-phase fluid is introduced into the test section of the first two-phase flow meter, and the two-phase flow meter under test measures the test gas-liquid two-phase fluid.

[0021] 3) The gas-liquid two-phase fluid used for testing enters the gas-liquid two-phase flow separation unit for separation;

[0022] 4) The separated gas phase flows into the gas phase flow metering unit for measurement, and the separated liquid phase flows into the liquid phase storage unit. The liquid phase storage unit periodically drains the liquid so that the separated liquid phase flows into the first liquid phase flow metering unit for measurement.

[0023] 5) Compare the measured values ​​of the gas phase flow metering unit and the measured values ​​of the first liquid phase flow metering unit with the measured values ​​of the two-phase flow meter under test to complete the test and evaluation of the performance of the two-phase flow meter under test.

[0024] (2) When it is necessary to perform a metering performance test on the two-phase flowmeter under test and the incoming fluid is a single-phase gas, the test system of the present invention adopts a passive comparison test mode. In this mode,

[0025] This invention discloses a comparative testing method for two-phase flow meters used in shale gas, comprising the following steps:

[0026] 1) Install the two-phase flow meter under test in the first two-phase flow meter test section, and install the fluid straight pipe in the second two-phase flow meter test section;

[0027] 2) Start the liquid phase pumping system to inject the liquid stored in the liquid phase storage unit into the upstream of the test section of the first two-phase flow meter after being measured by the second liquid phase flow metering unit. Then, it mixes with the incoming single-phase gas to form the gas-liquid two-phase fluid used for testing and is introduced into the test section of the first two-phase flow meter. The two-phase flow meter under test measures the gas-liquid two-phase fluid used for testing.

[0028] 3) The gas-liquid two-phase fluid used for testing enters the gas-liquid two-phase flow separation unit for separation;

[0029] 4) The separated gas phase flows into the gas phase flow metering unit for measurement, and the separated liquid phase flows into the liquid phase storage unit;

[0030] 5) Compare the measured values ​​of the gas phase flow metering unit and the second liquid phase flow metering unit as reference values ​​with the measured values ​​of the two-phase flow meter under test to complete the test and evaluation of the performance of the two-phase flow meter under test.

[0031] (3) When it is necessary to perform a metering performance test on the two-phase flowmeter under test and the incoming fluid is a gas-liquid two-phase fluid, the test system of the present invention can also adopt an active auxiliary test mode. In this mode,

[0032] 1) Install the two-phase flow meter under test in the first two-phase flow meter test section, and install the fluid straight pipe in the second two-phase flow meter test section;

[0033] 2) Start the liquid phase pumping system to inject the liquid stored in the liquid phase storage unit into the upstream of the second two-phase flow test section after being measured by the second liquid phase flow metering unit. It mixes with the incoming gas-liquid two-phase fluid to form a test gas-liquid two-phase fluid. The test gas-liquid two-phase fluid is then introduced into the test section of the first two-phase flow meter, and the two-phase flow meter under test measures the test gas-liquid two-phase fluid.

[0034] 3) The gas-liquid two-phase fluid used for testing enters the gas-liquid two-phase flow separation unit for separation;

[0035] 4) The separated gas phase flows into the gas phase flow metering unit for measurement, and the separated liquid phase flows into the liquid phase storage unit. The liquid phase storage unit periodically drains the liquid so that the separated liquid phase flows into the first liquid phase flow metering unit for measurement.

[0036] 5) The sum of the measured values ​​of the gas phase flow metering unit, the first liquid phase flow metering unit, and the second liquid phase flow metering unit is used as a reference value and compared with the measured value of the two-phase flow meter under test to complete the test and evaluation of the performance of the two-phase flow meter under test.

[0037] (4) When calibration of the two-phase flowmeter under test is required, the test system of this invention adopts an active auxiliary test mode.

[0038] This invention discloses a comparative testing method for two-phase flow meters used in shale gas, comprising the following steps:

[0039] 1) Install the two-phase flow meter under test in the second two-phase flow meter test section, and install the fluid straight pipe in the first two-phase flow meter test section;

[0040] 2) The test fluid enters the gas-liquid separation unit for separation after passing through the test section of the first two-phase flow meter;

[0041] 3) The separated single-phase gas is measured by the gas phase flow metering unit and then flows into the second two-phase flow test section;

[0042] 4) Start the liquid phase pumping system to inject the liquid stored in the liquid phase storage unit into the upstream of the second two-phase flow test section after being measured by the second liquid phase flow metering unit. Then, it mixes with the separated single-phase gas to form a test gas-liquid two-phase fluid and is introduced into the test section of the second two-phase flow meter. The test two-phase flow meter measures the test gas-liquid two-phase fluid.

[0043] 5) The two-phase flowmeter under test is calibrated using the measured value of the gas phase flow metering unit and the measured value of the second liquid phase flow metering unit.

[0044] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0045] 1. The present invention provides a two-phase flow meter comparison and testing system and method for shale gas, which can carry out comparison testing and periodic calibration of two-phase flow meters under different actual working conditions at the shale gas wellhead. It can adapt to testing under various fluid conditions and can carry out testing of two-phase flow meters when the incoming fluid is single-phase gas or gas-liquid two-phase flow.

[0046] 2. The two-phase flow meter comparison and testing system and method for shale gas provided in this embodiment of the invention can partially adjust the gas phase flow rate and liquid phase flow rate of the gas-liquid two-phase flow under various different field working conditions and shale gas wellhead conditions, which greatly improves the testing and evaluation efficiency of the two-phase flow meter for shale gas and solves the technical problems of field performance evaluation and periodic testing of the two-phase flow meter for shale gas.

[0047] 3. The two-phase flow meter comparison test system and method for shale gas provided in this embodiment of the invention can be switched to a passive comparison test mode to test the long-term metrological performance of the two-phase flow meter in field application by controlling the process flow, or it can be switched to an active auxiliary test mode to quickly test the metrological performance of the two-phase flow meter under various field working conditions, or it can be switched to a rapid calibration mode to quickly test and calibrate the performance of the two-phase flow meter.

[0048] 4. The present invention provides a two-phase flow meter comparison test system and method for shale gas. The flow of gas phase fluid does not require a power device to drive it. The test can be carried out using the selected test gas source. The test of liquid phase fluid can be carried out by circulating through a liquid phase pump injection system or by direct discharge as needed, depending on the test mode. Attached Figure Description

[0049] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 This is a schematic diagram of the test system structure provided in an embodiment of the present invention.

[0051] The attached diagram shows the markings and corresponding component names:

[0052] 1-First valve regulating unit, 2-Shut-off valve of the measured two-phase flow meter, 3-Mounting position one of the measured two-phase flow meter, 4-Bypass valve of the measured two-phase flow meter, 11-Gas-liquid two-phase flow separation unit, 12-Liquid phase storage unit, 13-Process flow control valve one, 14-Liquid phase pumping system, 15-Process flow control valve two, 16-Process flow control valve three, 17-Process flow control valve four, 18-Process flow control valve five, 19-Mounting position two of the measured two-phase flow meter, 22-Shut-off valve, 23-Bypass regulating valve. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the embodiments. The illustrative embodiments and descriptions of this invention are only used to explain this invention and are not intended to limit this invention.

[0054] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that these specific details are not necessary to practice the invention. In other embodiments, well-known structures or methods have not been specifically described in order to avoid obscuring the invention.

[0055] Throughout this specification, references to "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with that embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "an embodiment," "an example," "an example," or "an example" appearing in various places throughout the specification do not necessarily refer to the same embodiment or example. Furthermore, specific features, structures, or characteristics can be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0056] Example 1

[0057] An embodiment of the present invention provides a two-phase flow meter comparison and testing system for shale gas, comprising the following components arranged sequentially along the flow direction of the test fluid:

[0058] The flow regulation bypass diversion unit includes a first valve regulation unit 1 and a bypass regulation valve 23, which is used to regulate the flow rate of the incoming single-phase gas or gas-liquid two-phase fluid for testing.

[0059] The first two-phase flow meter test section is used to install the two-phase flow meter under test or the fluid straight pipe;

[0060] The gas-liquid two-phase flow separation unit 11 is used to separate the gas-liquid two-phase fluid flowing through the test section of the first two-phase flow meter into a separate gas phase and a separate liquid phase;

[0061] A gas phase flow metering unit is used to measure the flow rate of the separated gas phase;

[0062] The liquid phase storage unit 12 is used to store the separated liquid phase or to store the test liquid phase in advance. It is equipped with a liquid level control system and a liquid discharge control system. The liquid level control system can be used to measure the stored liquid and control the amount of stored liquid.

[0063] The first liquid phase flow metering unit is used to measure the flow rate of the separated liquid phase;

[0064] The second liquid phase flow metering unit is connected in parallel with the first liquid phase flow metering unit and is used to measure the flow rate of the test liquid phase injected into the upstream test position of the flow meter test section;

[0065] The liquid phase pumping system is located between the second liquid phase flow metering unit and the liquid phase storage unit, and is used to inject the liquid stored in the liquid phase storage unit into the upstream test position of the flow meter test section.

[0066] The second two-phase flow meter test section is set at the rear end of the gas phase flow metering unit and the second liquid phase flow metering unit. When the first two-phase flow meter test section is equipped with a fluid straight pipe, the second two-phase flow meter test section is equipped with the two-phase flow meter to be measured.

[0067] Both the first and second two-phase flow meter test sections have flow meters installed at the mounting positions of the two-phase flow meters under test.

[0068] When performance testing of the two-phase flowmeter under test is required, one or more two-phase flowmeters under test are installed in series / parallel in the first two-phase flowmeter test section, and a fluid straight pipe is installed in the second two-phase flowmeter test section; when calibration of the two-phase flowmeter under test is required, a fluid straight pipe is installed in the first two-phase flowmeter test section, and one or more two-phase flowmeters under test are installed in series in the second two-phase flowmeter test section; each of the two-phase flowmeters under test in the first two-phase flowmeter test section is equipped with a switching bypass, which includes a two-phase flowmeter shut-off valve 2 and a two-phase flowmeter bypass valve 4.

[0069] Example 2

[0070] like Figure 1 As shown, when it is necessary to perform metering performance testing on the two-phase flowmeter under test and the incoming fluid is a gas-liquid two-phase fluid, the testing system of this invention adopts a passive comparison testing mode. In this mode...

[0071] An embodiment of the present invention provides a comparative testing method for two-phase flow meters used in shale gas, comprising the following steps:

[0072] 1) The two-phase flow meter to be tested is installed in the first two-phase flow meter test section. Multiple two-phase flow meters can be installed in the first two-phase flow meter test section at the same time. Each two-phase flow meter is equipped with a two-phase flow meter shut-off valve 2, a two-phase flow meter installation platform 3, and a two-phase flow meter bypass valve 4. By switching the valves, one or more two-phase flow meters can be tested. The second two-phase flow meter test section is installed with a fluid straight pipe. At this time, the process flow control valve 4 17, process flow control valve 5 18, process flow control valve 1 13, and shut-off valve 22 are closed.

[0073] 2) By combining the first valve regulating unit 1 and the bypass regulating valve 23, the flow rate of the incoming test gas-liquid two-phase fluid is adjusted to the required flow rate value, and then introduced into the test section of the first two-phase flow meter. The two-phase flow meter under test measures the test gas-liquid two-phase fluid.

[0074] 3) The gas-liquid two-phase fluid for testing enters the gas-liquid two-phase flow separation unit 11 for separation;

[0075] 4) The separated gas phase flows into the gas phase flow metering unit for metering, and the separated liquid phase flows into the liquid phase storage unit 12. The process flow control valve 2 15 and the process flow control valve 3 16 are automatically adjusted according to the control system of the liquid phase storage unit. The control system of the liquid phase storage unit periodically drains the liquid so that the separated liquid flows through the first liquid phase flow metering unit for metering.

[0076] 5) Compare the measured values ​​of the gas phase flow metering unit and the measured values ​​of the first liquid phase flow metering unit with the measured values ​​of the two-phase flow meter under test to complete the test and evaluation of the performance of the two-phase flow meter under test.

[0077] Example 3

[0078] like Figure 1 As shown, when it is necessary to perform metering performance testing on the two-phase flowmeter under test and the incoming fluid is single-phase gas, the testing system of this invention adopts a passive comparison testing mode. In this mode...

[0079] This invention discloses a comparative testing method for two-phase flow meters used in shale gas, comprising the following steps:

[0080] 1) The two-phase flow meter to be tested is installed in the first two-phase flow meter test section. Multiple two-phase flow meters can be installed in the first two-phase flow meter test section at the same time. Each two-phase flow meter is equipped with a two-phase flow meter shut-off valve 2, a two-phase flow meter installation platform 3, and a two-phase flow meter bypass valve 4. By switching the valves, one or more two-phase flow meters can be tested. The fluid straight pipe is installed in the second two-phase flow meter test section. At this time, the process flow control valve 4 17 is closed, and the process flow control valve 5 18 and process flow control valve 1 13 are opened.

[0081] 2) By combining the first valve regulating unit 1 and the bypass regulating valve 23, the flow rate of the incoming single-phase gas is adjusted to the required flow rate value. The liquid phase pumping system is started to inject the liquid stored in the liquid phase storage unit into the upstream of the first two-phase flow meter test section after being measured by the second liquid phase flow metering unit according to the required flow rate. Then, it is mixed with the incoming single-phase gas to form the gas-liquid two-phase fluid used for testing and is introduced into the test section of the first two-phase flow meter. The tested two-phase flow meter measures the gas-liquid two-phase fluid used for testing.

[0082] 3) The gas-liquid two-phase fluid used for testing enters the gas-liquid two-phase flow separation unit for separation;

[0083] 4) The separated gas phase flows into the gas phase flow metering unit for measurement, and the separated liquid phase flows into the liquid phase storage unit;

[0084] 5) Compare the measured values ​​of the gas phase flow metering unit and the second liquid phase flow metering unit as reference values ​​with the measured values ​​of the two-phase flow meter under test to complete the test and evaluation of the performance of the two-phase flow meter under test.

[0085] Example 4

[0086] like Figure 1 As shown, when it is necessary to perform metering performance testing on the two-phase flowmeter under test and the incoming fluid is a gas-liquid two-phase fluid, the testing system of the present invention can also adopt an active auxiliary testing mode. In this mode...

[0087] 1) The two-phase flow meter to be tested is installed in the first two-phase flow meter test section. Multiple two-phase flow meters can be installed in the first two-phase flow meter test section at the same time. Each two-phase flow meter is equipped with a two-phase flow meter shut-off valve 2, a two-phase flow meter installation platform 3, and a two-phase flow meter bypass valve 4. By switching the valves, one or more two-phase flow meters can be tested. The fluid straight pipe is installed in the second two-phase flow meter test section. At this time, the process flow control valve 4 17 is closed, and the process flow control valve 5 18 and process flow control valve 1 13 are opened.

[0088] 2) By combining the first valve regulating unit 1 and the bypass regulating valve 23, the flow rate of the incoming test gas-liquid two-phase fluid is adjusted to the required flow rate value. The liquid phase pumping system is started to inject the liquid stored in the liquid phase storage unit into the upstream of the test section of the first two-phase flow meter after being metered by the second liquid phase flow metering unit according to the required replenishment flow rate. The liquid is mixed with the incoming gas-liquid two-phase fluid to form the test gas-liquid two-phase fluid. The test gas-liquid two-phase fluid is then introduced into the test section of the first two-phase flow meter, and the two-phase flow meter under test measures the test gas-liquid two-phase fluid.

[0089] 3) The gas-liquid two-phase fluid used for testing enters the gas-liquid two-phase flow separation unit for separation;

[0090] 4) The separated gas phase flows into the gas phase flow metering unit for measurement, and the separated liquid phase flows into the liquid phase storage unit. The liquid phase storage unit periodically drains the liquid so that the separated liquid phase flows into the first liquid phase flow metering unit for measurement.

[0091] 5) The sum of the measured values ​​of the gas phase flow metering unit, the first liquid phase flow metering unit, and the second liquid phase flow metering unit is used as a reference value and compared with the measured value of the two-phase flow meter under test to complete the test and evaluation of the performance of the two-phase flow meter under test.

[0092] Example 5

[0093] When calibration of the two-phase flowmeter under test is required, the testing system of this invention adopts an active assisted testing mode. In this mode, the incoming test fluid can be either a gas-liquid two-phase flow or a single-phase gas.

[0094] This invention discloses a comparative testing method for two-phase flow meters used in shale gas, comprising the following steps:

[0095] 1) Install the two-phase flowmeter to be tested in the second two-phase flowmeter test section. Multiple two-phase flowmeters can be installed simultaneously in the first two-phase flowmeter test section. Each two-phase flowmeter is equipped with a two-phase flowmeter installation position 19. The first two-phase flowmeter test section is installed with a straight fluid pipe. At this time, close process flow control valves 15, 16, and 18, and open process flow control valve 17.

[0096] 2) The test fluid enters the gas-liquid separation unit for separation after passing through the test section of the first two-phase flow meter;

[0097] 3) The separated single-phase gas is measured by the gas phase flow metering unit and then flows into the second two-phase flow test section;

[0098] 4) Start the liquid phase pumping system to inject the liquid stored in the liquid phase storage unit into the upstream of the second two-phase flow test section after being metered by the second liquid phase flow metering unit according to the required flow rate. Then, it mixes with the separated single-phase gas to form a test gas-liquid two-phase fluid and is introduced into the test section of the second two-phase flow meter. The tested two-phase flow meter measures the test gas-liquid two-phase fluid.

[0099] 5) The two-phase flowmeter under test is calibrated using the measured value of the gas phase flow metering unit and the measured value of the second liquid phase flow metering unit.

[0100] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A two-phase flow meter comparison and testing system for shale gas, characterized in that, Including those arranged sequentially along the direction of test fluid flow: The first two-phase flow meter test section is used to install the two-phase flow meter under test or the fluid straight pipe; The gas-liquid two-phase flow separation unit is used to separate the gas-liquid two-phase fluid flowing through the test section of the first two-phase flow meter into a separate gas phase and a separate liquid phase; A gas phase flow metering unit is used to measure the flow rate of the separated gas phase; A liquid phase storage unit is used to store the separated liquid phase or to store the liquid phase for testing in advance. The first liquid phase flow metering unit is used to measure the flow rate of the separated liquid phase; The second liquid phase flow metering unit is connected in parallel with the first liquid phase flow metering unit and is used to measure the flow rate of the test liquid phase injected into the upstream test position of the flow meter test section; It also includes a second two-phase flow meter test section set at the rear end of the gas phase flow metering unit and the second liquid phase flow metering unit. When the first two-phase flow meter test section is equipped with a fluid straight pipe, the second two-phase flow meter test section is equipped with the two-phase flow meter to be measured. When the performance of the two-phase flow meter under test needs to be tested, the two-phase flow meter under test is installed in the first two-phase flow meter test section, and the fluid straight pipe is installed in the second two-phase flow meter test section; when the two-phase flow meter under test needs to be calibrated, the fluid straight pipe is installed in the first two-phase flow meter test section, and the two-phase flow meter under test is installed in the second two-phase flow meter test section.

2. The shale gas two-phase flow meter comparison and testing system according to claim 1, characterized in that, An upstream section of the first two-phase flow meter test section is also equipped with a flow regulation bypass diversion unit, which includes a first valve regulation unit and a bypass regulation valve, used to regulate the flow rate of the single-phase gas or gas-liquid two-phase fluid used for testing.

3. The two-phase flow meter comparison and testing system for shale gas according to claim 1, characterized in that, A liquid phase pumping system is provided between the second liquid phase flow metering unit and the liquid phase storage unit. The liquid phase pumping system is used to inject the liquid stored in the liquid phase storage unit into the upstream test position of the flow meter test section.

4. The shale gas two-phase flow meter comparison and testing system according to claim 1, characterized in that, Both the first two-phase flow meter test section and the second two-phase flow meter test section can be equipped with multiple two-phase flow meters installed in series or in parallel, and each two-phase flow meter is equipped with a switching bypass.

5. The shale gas two-phase flow meter comparison and testing system according to claim 1, characterized in that, The liquid storage unit is equipped with a liquid level control system and a liquid discharge control system. The liquid level control system can measure the stored liquid and control the amount of stored liquid.

6. A comparative testing method for two-phase flow meters used in shale gas, characterized in that, When it is necessary to perform performance testing on a two-phase flow meter under test, the following steps are included: 1) The two-phase flowmeter under test is installed in the first two-phase flowmeter test section of the comparison test system according to any one of claims 1-3, and the second two-phase flowmeter test section is installed with a fluid straight pipe; 2) When the incoming fluid is a gas-liquid two-phase fluid, the test gas-liquid two-phase fluid is introduced into the test section of the first two-phase flow meter, and the two-phase flow meter under test measures the test gas-liquid two-phase fluid. 3) The gas-liquid two-phase fluid used for testing enters the gas-liquid two-phase flow separation unit for separation; 4) The separated gas phase flows into the gas phase flow metering unit for measurement, and the separated liquid phase flows into the liquid phase storage unit. The liquid phase storage unit is periodically drained so that the separated liquid phase flows into the first liquid phase flow metering unit for measurement. 5) Compare the measured values ​​of the gas phase flow metering unit and the measured values ​​of the first liquid phase flow metering unit with the measured values ​​of the two-phase flow meter under test to complete the test and evaluation of the performance of the two-phase flow meter under test.

7. The comparative testing method for two-phase flowmeters used in shale gas according to claim 6, characterized in that, When the incoming fluid is a single-phase gas, the steps are as follows: 2) Start the liquid phase pumping system to inject the liquid stored in the liquid phase storage unit into the upstream of the test section of the first two-phase flow meter after being measured by the second liquid phase flow metering unit. Then, it mixes with the incoming single-phase gas to form the gas-liquid two-phase fluid used for testing and enters the test section of the first two-phase flow meter. The two-phase flow meter under test measures the gas-liquid two-phase fluid used for testing; 3) The gas-liquid two-phase fluid used for testing enters the gas-liquid two-phase flow separation unit for separation; 4) The separated gas phase flows into the gas phase flow metering unit for measurement, and the separated liquid phase flows into the liquid phase storage unit; 5) The measured value of the gas phase flow metering unit and the measured value of the second liquid phase flow metering unit are used as reference values ​​and compared with the measured value of the two-phase flow meter under test to complete the test and evaluation of the performance of the two-phase flow meter under test.

8. The comparative testing method for two-phase flowmeters used in shale gas according to claim 6, characterized in that, When calibrating the two-phase flowmeter under test, the following steps are included: 1) Install the two-phase flowmeter under test in the second two-phase flowmeter test section of the comparison test system described in any one of claims 1-3, and install a fluid straight pipe in the first two-phase flowmeter test section; 2) The test fluid enters the gas-liquid separation unit through the first two-phase flowmeter test section for separation; 3) The separated single-phase gas is measured by the gas phase flow metering unit and then flows into the second two-phase flow test section; 4) Start the liquid phase pumping system to inject the liquid stored in the liquid phase storage unit into the upstream of the second two-phase flow test section after being measured by the second liquid phase flow metering unit, and then mixes with the separated single-phase gas to form a test gas-liquid two-phase fluid and introduce it into the second two-phase flowmeter test section, and the two-phase flowmeter under test measures the test gas-liquid two-phase fluid; 5) Use the measured value of the gas phase flow metering unit and the measured value of the second liquid phase flow metering unit as reference values ​​to calibrate the two-phase flowmeter under test.

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