A two-phase mass flow meter based on Coriolis force and a two-phase flow measurement method

Abstract

The present invention relates to the technical field of mass flowmeters, and provides a two-phase flow mass flowmeter based on Coriolis force, comprising a transducer and a transmitter, wherein the transducer comprises a sensor and a working condition measurement module, and the transmitter comprises a calculation module, wherein the sensor and the working condition measurement module are respectively connected to the calculation module for communication. In addition, the present invention also provides a two-phase flow measurement method. The mass flowmeter provided by the present invention can effectively measure the gas phase mass flow rate and the liquid phase mass flow rate in a gas-liquid two-phase flow, and the mass flow measurement method can improve the accuracy of the measurement result, thereby improving the measurement accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of mass flowmeters, and in particular to a two-phase flow mass flowmeter based on Coriolis force and a two-phase flow measurement method. Background Art

[0002] During the exploitation of oil and gas fields, it is necessary to measure the production of each single well in the oil and gas field, and also to measure the gas and liquid phase production of the single well. The on-site staff objectively evaluates the production status of the single well through these data combined with the production parameters collected such as the pressure and temperature of the single well. Finally, the management personnel summarize and analyze the data of each single well, optimize the production allocation of the single well, and provide data support for the formulation of the oil and gas field production plan.

[0003] However, during the oil and gas collection and production process, the gas content of the medium is often erratic, sometimes all gas, sometimes all liquid, and is affected by the tide. In addition, different pipeline pressures are used for different transmission distances. The temperature changes with the alternation of day and night throughout the year. In short, the working conditions of oil and gas wellhead metering are complex and changeable.

[0004] The Coriolis mass flowmeter is used for direct measurement of fluid mass flow. It has high measurement accuracy and good repeatability. It is basically not affected by factors such as temperature, flow rate, pressure, viscosity, etc., and can also simultaneously measure multiple parameters such as fluid volume flow, density, temperature, and different fluid conditions. Mass flowmeters based on Coriolis force are widely used for fluid measurement of a single medium, providing an important means for fluid transportation metering, but have not yet been widely used in multiphase flow metering such as oil and gas, oil, gas and water. For natural gas and oil, gas and water mixture transmission pipelines, due to their unstable temperature and pressure, especially in oil and gas production well transmission pipelines, not only are the pressure and temperature unstable, but the impurity content often changes, and the density is also different under different production conditions, which brings great trouble to the transmission metering. Therefore, there is an urgent need for a mass flowmeter that can accurately measure the gas phase mass flow rate and liquid phase mass flow rate under the working conditions of gas-liquid two-phase flow.

[0005] Application Contents

[0006] The first object of the present invention is to provide a two-phase flow mass flowmeter based on Coriolis force, which has a reasonable design and a simpler structure and can effectively measure the gas phase mass flow rate and the liquid phase mass flow rate in the gas-liquid two-phase flow.

[0007] To achieve the above object, the present invention provides a two-phase mass flowmeter based on Coriolis force, comprising a transducer and a transmitter, wherein the transducer comprises a sensor and a working condition measurement module, the transmitter comprises a calculation module, and the sensor and the working condition measurement module are respectively connected to the calculation module for communication;

[0008] The sensor is used to measure the original total mass flow rate Q of the fluid. m and the original mixture density ρ min , and the measured original total mass flow Q m and the original mixture density ρ min Transmit to the computing module;

[0009] The working condition measurement module is used to measure the working condition pressure P and the working condition temperature T, and transmit the measured working condition pressure P and the working condition temperature T to the calculation module;

[0010] The calculation module is used to receive the data transmitted by the sensor and the working condition measurement module, and calculate the liquid mass flow rate Q1 and the gas mass flow rate Q g .

[0011] Optionally, the transducer further comprises a measuring tube, and the sensor is mounted on the measuring tube;

[0012] The working condition measurement module comprises a pressure sensor and a temperature sensor. The pressure sensor is arranged at the inlet end of the measuring tube, and the temperature sensor is closely attached to the outer wall of the measuring tube.

[0013] Optionally, the sensor includes a coil and a magnet, the number of turns of the coil is 1500, and the magnet is a strong magnetic steel.

[0014] Optionally, the pressure sensor is an absolute pressure sensor, and the temperature sensor is a platinum resistance temperature sensor.

[0015] The second object of the present invention is to provide a two-phase flow measurement method, which can achieve more accurate measurement of the gas phase mass flow rate and the liquid phase mass flow rate in the gas-liquid two-phase flow, improve measurement accuracy, and reduce measurement errors.

[0016] To achieve the above object, the present invention provides a two-phase flow measurement method, using the above-mentioned two-phase flow mass flowmeter based on Coriolis force, comprising the following steps:

[0017] S1. Use the sensor to measure the original total mass flow rate Q of the fluid m and the original mixture density ρ min , using the working condition measurement module to measure the working condition pressure P and the working condition temperature T;

[0018] S2. Using the calculation module to calculate the working gas phase density ρ g , while the original mixture density ρ min Correction is performed to obtain the corrected mixed density ρ min ';

[0019] S3. The calculation module is based on the liquid density ρ1, the working gas density ρg and the corrected mixture density ρ min 'Calculate the mass liquid fraction LMF and mass gas fraction GMF of the fluid;

[0020] S4. The calculation module measures the original total mass flow rate Q according to the mass gas fraction GMF. m Correction is performed to obtain the corrected total mass flow rate Q m ';

[0021] S5. The calculation module is based on the corrected total mass flow Q m ', mass gas fraction GMF and mass liquid fraction LMF are calculated to obtain the liquid mass flow rate Q1 and gas mass flow rate Q g .

[0022] Optionally, in step S2, the calculation module is used to calculate the original mixed density ρ min The steps to make the correction include:

[0023] The calculation module combines the working pressure P, working temperature T and the original mixed density ρ min Fitting correction formula to establish working pressure P, working temperature T, original mixed density ρ min and the corrected mixture density ρ min 'Data model, get the corrected mixing density ρ min ', the correction formula is:

[0024] ρ min '=A(P,T)×ρ min +B(P,T);

[0025] Among them, A is the correction coefficient and B is the correction constant.

[0026] Optionally, in step S2, the calculation module is used to calculate the working gas phase density ρ g The steps include:

[0027] The calculation module combines the operating pressure P, the operating temperature T and the gas PVT equation, using the formula:

[0028] The working gas phase density is calculated;

[0029] Among them, ρ0 is the standard volume density of the gas phase, P0 is the standard atmospheric pressure, and T0 is the absolute temperature.

[0030] Optionally, the step of calculating the mass liquid fraction LMF and the mass gas fraction GMF of the fluid by the calculation module in step S3 includes:

[0031] Using the formula: The mass liquid fraction LMF is calculated;

[0032] The mass gas fraction GMF is calculated using the formula: GMF=1-LMF.

[0033] Optionally, the calculation module in step S4 calculates the measured original total mass flow rate Q according to the mass gas fraction GMF. m The steps to make the correction include:

[0034] Combined with mass gas fraction GMF and original total mass flow rate Q m and the corrected total mass flow Q m ', fit the correction formula to establish the mass gas fraction GMF and the original total mass flow rate Q m and the corrected total mass flow Q m ' mathematical model, and obtain the corrected total mass flow rate Q m ', the correction formula is:

[0035] Q m '=Q m ×(C×GMF 2 +D×GMF+E);

[0036] Among them, C is the second-order correction coefficient, D is the first-order correction coefficient, and E is the correction constant.

[0037] Optionally, the calculation module in step S5 is based on the corrected total mass flow Q m ', mass gas fraction GMF and mass liquid fraction LMF are calculated to obtain the liquid mass flow rate Q1 and gas mass flow rate Q g The steps include:

[0038] Using the formula: Q1 = Q m '×LMF, calculate the liquid mass flow rate Q1;

[0039] Using the formula: Q g =Q m '×GMF, calculate the gas phase mass flow rate Q g .

[0040] The technical solution of the embodiment of the present invention has at least the following advantages and beneficial effects:

[0041] 1. The mass flowmeter provided by the present invention has a reasonable design and a simple structure. It can effectively measure the gas phase mass flow rate and the liquid phase mass flow rate in the gas-liquid two-phase flow, thereby improving the measurement accuracy.

[0042] 2. The measurement method provided by the present invention is to measure the original total mass flow Q m and the original mixture density ρ min After correction, the total mass flow Q m' and the original mixture density ρ min 'Calculate the liquid mass flow rate Q1 and gas mass flow rate Q g , which can greatly reduce the measurement error and make the measurement results more accurate and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 A schematic diagram of the structure of a mass flow meter provided in Example 1 of the present invention;

[0045] Figure 2 A top view of the mass flow meter provided in Example 1 of the present invention.

[0046] Icon: 1- transducer, 11- main body, 12- measuring tube, 13- sensor, 14- internal joint, 15- flange, 16- head, 17- pressure sensor, 18- temperature sensor, 19- pressure gauge joint, 2- transmitter, 3- connecting piece. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0048] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0050] In the description of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0051] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] Example 1

[0053] Please refer to Figure 1 and Figure 2 A two-phase mass flowmeter based on Coriolis force, comprising a transducer 1 and a transmitter 2, wherein the transducer 1 comprises a main body 11, a measuring tube 12, a sensor 13 and a working condition measurement module, the measuring tube 12 is mounted on the main body 11, and can be a tube in various forms such as a triangle, a slightly curved type or a straight tube type, and both sides of the main body 11 are provided with an inner joint 14 and a flange 15, the inlet end and the outlet end of the measuring tube 12 are respectively connected to the inner joints 14 on both sides of the main body 11, and both sides of the main body 11 are provided with a head 16, the head 16 is used to seal the inner joint 14 and the main body 11, and the sensor 13 is mounted on the measuring tube 12, which comprises a driving sensor arranged at a driving position of the measuring tube 12 and a detection sensor at a detection position of the measuring tube 12, wherein the sensor 13 comprises a coil and a magnetic steel used in conjunction with the coil;

[0054] The transmitter 2 includes a computing module, and the transmitter 2 is connected to the main body 11 through a connector 3 and fixed in the middle position of the main body 11; the above-mentioned sensor 13 and the operating condition measurement module are respectively connected to the computing module through cable communication; it should be noted that in addition to the computing module, the above-mentioned transmitter 2 also includes a signal conditioning module, an operating condition acquisition module, a communication module, a display module and a power supply module. These conventional modules in the prior art will not be described in detail here.

[0055] The sensor 13 is used to measure the original total mass flow rate Q of the fluid. m and the original mixture density ρ min, and the measured original total mass flow Q m and the original mixture density ρ min Transmit to the computing module;

[0056] The working condition measurement module is used to measure the working condition pressure P and the working condition temperature T, and transmit the measured working condition pressure P and the working condition temperature T to the calculation module;

[0057] The calculation module is used to receive the data transmitted by the sensor 13 and the working condition measurement module (i.e. the original total mass flow Q m , the original mixture density ρ min , operating pressure P and operating temperature T), and calculate the liquid mass flow rate Q1 and gas mass flow rate Q g Specifically, the calculation module first calculates the working gas phase density ρ g , while the original mixture density ρ min Correction is performed to obtain the corrected mixed density ρ min ', then according to the liquid density ρ1, the working gas density ρ g and the corrected mixture density ρ min 'Calculate the mass liquid fraction LMF and mass gas fraction GMF of the fluid, and use the mass gas fraction GMF to measure the original total mass flow rate Q m Correction is performed to obtain the corrected total mass flow rate Q m ', and finally according to the corrected total mass flow Q m ', mass gas fraction GMF and mass liquid fraction LMF are calculated to obtain the liquid mass flow rate Q1 and gas mass flow rate Q g .

[0058] In this embodiment, the above-mentioned working condition measurement module includes a pressure sensor 17 for measuring the working condition pressure P and a temperature sensor 18 for measuring the working condition temperature T; considering that the measuring tube 12 has a certain bend at the inlet and outlet ends, thereby generating a certain pressure drop, in order to more accurately measure the working condition pressure P, the above-mentioned pressure sensor 17 is arranged at the inlet end of the measuring tube 12, and the pressure sensor 17 is an absolute pressure sensor, which is connected to the connection between the flange 15 and the head 16 at the inlet end of the measuring tube 12 through a pressure gauge joint 19, and the working condition pressure P measured by the pressure sensor 17 is an absolute pressure, so that the gas phase working condition density ρ obtained by subsequent calculation g More accurate; and the temperature sensor 18 is arranged close to the outer wall of the measuring tube 12, and utilizes the characteristic of faster heat conduction to make the measurement process faster, and the measured operating temperature T is more accurate, and the temperature sensor 18 is a platinum resistance temperature sensor, which can obtain the average operating temperature T within a certain period of time, thereby improving the accuracy of the measurement result.

[0059] In this embodiment, considering that the Coriolis force generated by the fluid inside the measuring tube 12 is often very small under the working condition of gas-liquid two-phase flow, in order to make the measurement result more accurate, the number of turns of the coil of the sensor 13 is 1500, and the magnetic steel is a strong magnetic steel, and the magnetic flux density of the strong magnetic steel is 1.25T, so that the magnetic induction intensity of the strong magnetic steel is greater, the induced electromotive force that can be generated is stronger, and the electrical signal detected by the coil is stronger. Since the Coriolis force is very small under the two-phase flow working condition, the signal detected by the detection coil is reduced, affecting the signal quality, so the use of strong magnetic steel and the coil is used to improve the intensity and quality of the detection signal, so that a more accurate measurement result can be obtained.

[0060] Example 2

[0061] A two-phase flow measurement method, using the two-phase flow mass flowmeter based on Coriolis force described in the above embodiment, the specific measurement process includes the following steps:

[0062] S1. Use sensor 13 to measure the original total mass flow rate Q of the fluid m and the original mixture density ρ min , the working condition pressure P and the working condition temperature T are measured by the working condition measurement module. It should be noted that, considering that under the gas-liquid two-phase flow condition, the measuring tube 12 often vibrates violently when the fluid flows through the measuring tube 12, so that the collected data such as the working condition pressure P and the working condition temperature T fluctuate greatly. Therefore, in order to improve the accuracy of the final measurement result, the above working condition pressure P and working condition temperature T are the average working condition pressure and average working condition temperature after filtering within a certain period of time;

[0063] S2. Use the calculation module to calculate the working gas phase density ρ g , considering the original mixture density ρ min It will be directly used to calculate the mass liquid fraction LMF and other parameters. Therefore, in order to further improve the accuracy of the calculated mass liquid fraction LMF and other parameters, the calculation module is used to calculate the original mixed density ρ min Correction is performed to obtain the corrected mixed density ρ min ';

[0064] In the above step S2, the calculation module is used to calculate the working gas phase density ρ g The steps include:

[0065] The calculation module combines the operating pressure P, operating temperature T and gas PVT equation, using the formula:

[0066] The working gas phase density is calculated;

[0067] Among them, ρ0 is the standard volume density of the gas phase, P0 is the standard atmospheric pressure, and T0 is the absolute temperature.

[0068] In the above step S2, the calculation module is used to calculate the original mixed density ρ min The steps to make the correction include:

[0069] The calculation module combines the operating pressure P, operating temperature T and the original mixed density ρ min Fitting correction formula to establish working pressure P, working temperature T, original mixed density ρ min and the corrected mixture density ρ min 'Data model, get the corrected mixing density ρ min ', the correction formula is:

[0070] ρ min '=A(P,T)×ρ min +B(P,T);

[0071] Among them, A is the correction coefficient and B is the correction constant.

[0072] S3. The calculation module is based on the liquid density ρ1 and the working gas density ρ g and the corrected mixture density ρ min 'Calculate the mass liquid fraction LMF and mass gas fraction GMF of the fluid;

[0073] The step of calculating the mass liquid fraction LMF and the mass gas fraction GMF of the fluid by the calculation module in the above step S3 includes:

[0074] Using the formula: The mass liquid fraction LMF is calculated;

[0075] The mass gas fraction GMF is calculated using the formula: GMF=1-LMF.

[0076] S4. The calculation module calculates the measured original total mass flow rate Q according to the mass gas fraction GMF m Correction is performed to obtain the corrected total mass flow rate Q m ', using the mass gas fraction GMF to calculate the original total mass flow rate Q m Compared with the use of mass liquid fraction LMF, the model established in the subsequent mathematical model is less complex, faster to calculate, and more accurate.

[0077] The calculation module in step S4 calculates the measured original total mass flow rate Q according to the mass gas fraction GMF. m The steps to make the correction include:

[0078] Combined with mass gas fraction GMF and original total mass flow rate Q m and the corrected total mass flow Q m', fit the correction formula to establish the mass gas fraction GMF and the original total mass flow rate Q m and the corrected total mass flow Q m ' mathematical model, and obtain the corrected total mass flow rate Q m ', the correction formula is:

[0079] Q m '=Q m ×(C×GMF 2 +D×GMF+E);

[0080] Among them, C is the second-order correction coefficient, D is the first-order correction coefficient, and E is the correction constant.

[0081] S5. The calculation module is based on the corrected total mass flow Q m ', mass gas fraction GMF and mass liquid fraction LMF are calculated to obtain the liquid mass flow rate Q1 and gas mass flow rate Q g ;

[0082] The calculation module in step S5 above is based on the corrected total mass flow Q m ', mass gas fraction GMF and mass liquid fraction LMF are calculated to obtain the liquid mass flow rate Q1 and gas mass flow rate Q g The steps include:

[0083] Using the formula: Q1 = Q m '×LMF, calculate the liquid mass flow rate Q1;

[0084] Using the formula: Q g =Q m '×GMF, calculate the gas phase mass flow rate Q g .

[0085] Considering the different working pressures P and working temperatures T, the mass gas fraction GMF has an influence on the original total mass flow rate Q m The degree of influence is different. Therefore, in order to obtain more accurate measurement results, the original total mass flow rate Q can be calculated using the corresponding mass gas fraction GMF under multiple different operating pressures P and operating temperatures T. m Correction is performed to obtain a more accurate corrected total mass flow rate Q m '; At the same time, under different working pressures P and working temperatures T, the original mixed density ρ measured based on the Coriolis force principle min The influence is also different. Therefore, the original mixed density ρ can also be calculated under multiple different working pressures P and working temperatures T. min Correction is performed to obtain a more accurate corrected mixed density ρ min '.

[0086] In order to more fully illustrate this embodiment, the relevant data of the gas mass flow rate, liquid mass flow rate, total mass flow rate and mixed density measured under a plurality of different operating pressures P and operating temperatures T are listed below.

[0087] Table 1 Mass flow measurement data before and after correction

[0088]

[0089] It should be noted that the total mass flow before correction in Table 1 is the original total mass flow Q m , and the standard gas mass flow rate, standard liquid mass flow rate and standard total mass flow rate are the standard flow values ​​under the corresponding working conditions.

[0090] It can be directly seen from Table 1 that under the same operating pressure P and operating temperature T, the corrected gas mass flow rate Q g , liquid mass flow Q1 and total mass flow Q m 'It is closer to the standard gas mass flow rate, standard liquid mass flow rate and standard total mass flow rate. Compared with the relevant mass flow rate measured before correction, the error between the relevant mass flow rate measured after correction and the standard mass flow rate is much smaller than the error between the relevant mass flow rate measured before correction and the standard mass flow rate.

[0091] Table 2 Mixed density measurement data before and after correction

[0092]

[0093] Similarly, the mixed density before correction in Table 2 above is the original mixed density ρ min , and the standard mixed density is the standard density value under the corresponding working conditions.

[0094] It can be directly seen from Table 2 that, under the same operating pressure P and operating temperature T conditions, the mixture density measured after correction is closer to the standard mixture density. Compared with the mixture density before correction, the error between the mixture density measured after correction and the standard mixture density is much smaller than the error between the mixture density measured before correction and the standard mixture density.

[0095] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A two-phase flow measurement method based on Coriolis force, wherein the two-phase flow mass flowmeter based on Coriolis force comprises a transducer and a transmitter, wherein the transducer comprises a sensor and a working condition measurement module, wherein the transmitter comprises a calculation module, wherein the sensor and the working condition measurement module are respectively connected to the calculation module in communication; in, The sensor is used to measure the original total mass flow rate Q of the fluid m and the original mixture density ρ mix ; The working condition measurement module is used to measure the working condition pressure P and the working condition temperature T; The calculation module is used to receive the data transmitted by the sensor and the working condition measurement module, and calculate the liquid mass flow rate Q1 and the gas mass flow rate Q g ; It is characterized in that the two-phase flow measurement method comprises the following steps: S1. Use the sensor to measure the original total mass flow rate Q of the fluid m and the original mixture density ρ mix , using the working condition measurement module to measure the working condition pressure P and the working condition temperature T; S2. Using the calculation module to calculate the working gas phase density ρ g , while the original mixture density ρ mix Correction is performed to obtain the corrected mixed density ρ mix '; S3. The calculation module is based on the liquid density ρ1, the working gas density ρ g and the corrected mixture density ρ mix 'Calculate the mass liquid fraction LMF and mass gas fraction GMF of the fluid; S4. The calculation module measures the original total mass flow rate Q according to the mass gas fraction GMF. m Correction is performed to obtain the corrected total mass flow rate Q m '; S5. The calculation module is based on the corrected total mass flow Q m ', mass gas fraction GMF and mass liquid fraction LMF are calculated to obtain the liquid mass flow rate Q1 and gas mass flow rate Q g ; In step S2, the calculation module is used to calculate the original mixed density ρ mix The steps to make the correction include: The calculation module combines the working pressure P, working temperature T and the original mixed density ρ mix Fitting correction formula to establish working pressure P, working temperature T, original mixed density ρ mix and the corrected mixture density ρ mix 'Data model, get the corrected mixing density ρ mix ', the correction formula is: ρ mix '=A(P,T)×ρ mix +B(P,T); Among them, A is the correction coefficient and B is the correction constant.

2. The two-phase flow measurement method based on Coriolis force according to claim 1, characterized in that: The transducer also includes a measuring tube, and the sensor is mounted on the measuring tube; The working condition measurement module comprises a pressure sensor and a temperature sensor. The pressure sensor is arranged at the inlet end of the measuring tube, and the temperature sensor is closely attached to the outer wall of the measuring tube.

3. The two-phase flow measurement method based on Coriolis force according to claim 1, characterized in that: The sensor comprises a coil and a magnet, the number of turns of the coil is 1500, and the magnet is a strong magnet.

4. The two-phase flow measurement method based on Coriolis force according to claim 2, characterized in that: The pressure sensor is an absolute pressure sensor, and the temperature sensor is a platinum resistance temperature sensor.

5. The two-phase flow measurement method according to claim 1, characterized in that: In step S2, the calculation module is used to calculate the working gas phase density ρ g The steps include: The calculation module combines the operating pressure P, the operating temperature T and the gas PVT equation, using the formula: The working gas phase density is calculated; Among them, ρ0 is the standard volume density of the gas phase, P0 is the standard atmospheric pressure, and T0 is the absolute temperature.

6. The two-phase flow measurement method according to claim 1, characterized in that: The step of calculating the mass liquid fraction LMF and the mass gas fraction GMF of the fluid by the calculation module in step S3 includes: Using the formula: The mass liquid fraction LMF is calculated; The mass gas fraction GMF is calculated using the formula: GMF=1-LMF.

7. The two-phase flow measurement method according to claim 1, characterized in that: In step S4, the calculation module calculates the measured original total mass flow rate Q according to the mass gas fraction GMF. m The steps to make the correction include: Combined with mass gas fraction GMF and original total mass flow rate Q m and the corrected total mass flow Q m ', fit the correction formula to establish the mass gas fraction GMF and the original total mass flow rate Q m and the corrected total mass flow Q m ' mathematical model, and obtain the corrected total mass flow rate Q m ', the correction formula is: Q m '=Q m ×(C×GMF 2 +D×GMF+E); Among them, C is the second-order correction coefficient, D is the first-order correction coefficient, and E is the correction constant.

8. The two-phase flow measurement method according to claim 1, characterized in that: The calculation module in step S5 is based on the corrected total mass flow Q m ', mass gas fraction GMF and mass liquid fraction LMF are calculated to obtain the liquid mass flow rate Q1 and gas mass flow rate Q g The steps include: Using the formula: Q1 = Q m '×LMF, calculate the liquid mass flow rate Q1; Using the formula: Q g =Q m '×GMF, calculate the gas phase mass flow rate Q g .

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