A gas-liquid non-separation weighing method double-cavity tube type metering device and method

Abstract

The present application relates to oil well metering equipment field, disclose a kind of gas-liquid non-separation weighing method double-cavity tubular metering device and method, the metering device includes A metering cavity, B metering cavity, A liquid level measurement control cavity, B liquid level measurement control cavity, A medium isolation cavity, B medium isolation cavity, A liquid level meter, B liquid level meter, pressure balance pipe, liquid inlet electric three-way valve, liquid outlet electric three-way valve, pressure gauge and automatic control system, A liquid level meter, B liquid level meter, liquid inlet electric three-way valve, liquid outlet electric three-way valve and pressure gauge are connected with automatic control system by cable.The present application has the characteristics of gas-liquid non-separation, without flowmeter for the measurement of liquid volume and gas volume, liquid level meter and electric three-way valve are used to realize continuous automatic measurement by mutual cooperation, real-time response oil well production data;It belongs to non-pressure vessel, and does not need annual inspection;Adopt double-cavity structure, and the measurement precision is high;Reasonable structure, safe and reliable.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oil well metering equipment, in particular to a gas-liquid non-separation weighing method double-cavity tubular metering device and method. BACKGROUND

[0002] In the process of oil well production, in order to monitor the production status of oil well in real time, it is necessary to install an online flowmeter on the production pipeline, so as to obtain the production data of oil, gas and water of oil well production in real time. The oil well can be dynamically adjusted and monitored through real-time production data, so as to optimize the production process.

[0003] In the process of oil well production, the commonly used metering equipment is a separation type metering device, wherein the separation type metering device mainly separates the medium produced by the oil well through a gas-liquid separation device, and then measures through a single flowmeter. The single flowmeter is greatly affected by gas, and when the gas-liquid ratio of the oil well changes sharply, the separated liquid will carry a part of free gas, and the single flowmeter cannot measure. Moreover, the traditional gas-liquid separation device is a pressure vessel, which needs to be inspected annually, has a service life, and needs to be scrapped when the service life is up. The maintenance amount is large and the maintenance cost is high in the later period, which is not conducive to oil well production. SUMMARY

[0004] In order to overcome the defects of the prior art, the present application provides a gas-liquid non-separation weighing method double-cavity tubular metering device and method, and the technical scheme is as follows:

[0005] The application discloses a gas-liquid non-separation weighing method double-cavity tube type metering device which comprises an A metering cavity, a B metering cavity, an A liquid level measurement and control cavity, a B liquid level measurement and control cavity, an A medium isolation cavity, a B medium isolation cavity, an A liquid level meter, a B liquid level meter, a pressure balance pipe, a liquid inlet electric three-way valve, a liquid outlet electric three-way valve, a pressure gauge and an automatic control system; the A liquid level meter is installed in the A liquid level measurement and control cavity through a flange, and the B liquid level meter is installed in the B liquid level measurement and control cavity through a flange; the upper portions of the A metering cavity and the B metering cavity are communicated with the pressure balance pipe, the lower portion of the A metering cavity is communicated with the A medium isolation cavity, and the lower portion of the B metering cavity is communicated with the B medium isolation cavity; the upper portion of the A liquid level measurement and control cavity is communicated with the pressure balance pipe through a connecting pipe, the lower portion of the A liquid level measurement and control cavity is communicated with the A medium isolation cavity through a connecting pipe and a flange, and a medium isolation unit is installed in the connecting pipe; the upper portion of the B liquid level measurement and control cavity is communicated with the pressure balance pipe through a connecting pipe, the lower portion of the B liquid level measurement and control cavity is communicated with the B medium isolation cavity through a connecting pipe and a flange, and a medium isolation unit is installed in the connecting pipe; the liquid inlet electric three-way valve is connected with the upper portions of the A metering cavity and the B metering cavity through a liquid inlet connecting pipe and a flange respectively, and the liquid outlet electric three-way valve is connected with the lower portions of the A metering cavity and the B metering cavity through a liquid outlet connecting pipe and a flange respectively; the A liquid level measurement and control cavity and the A metering cavity form a U-shaped A hydraulic balance system, the B liquid level measurement and control cavity and the B metering cavity form a U-shaped B hydraulic balance system, and the U-shaped A hydraulic balance system and the U-shaped B hydraulic balance system are combined into a large U-shaped pressure balance system through the pressure balance pipe; the pressure gauge is installed in the pressure balance pipe; the A liquid level meter, the B liquid level meter, the liquid inlet electric three-way valve, the liquid outlet electric three-way valve and the pressure gauge are connected with the automatic control system through cables.

[0006] Further, the A metering cavity and the B metering cavity are each provided with one or more metering cavities, and the number of metering cavities of the A metering cavity is the same as that of the B metering cavity; when the A metering cavity and the B metering cavity are provided with multiple metering cavities, the upper portions and the lower portions of the A metering cavity are respectively connected with the metering cavities through respective connecting pipes, and the upper portions and the lower portions of the B metering cavity are respectively connected with the metering cavities through respective connecting pipes.

[0007] Further, each metering cavity is provided with a liquid level control cavity communicated with the metering cavity; and the pressure balance pipe is provided as a multi-layer pipe communicated with each other.

[0008] Further, the A medium isolation cavity and the B medium isolation cavity are each provided with an electric heating mechanism.

[0009] Further, the electric heating mechanism comprises a partition pipe, an electric heating pipe and heat conducting oil; the partition pipe is arranged at the periphery of the electric heating pipe, the heat conducting oil is filled in the gap between the partition pipe and the electric heating pipe, the head portions of the partition pipe and the electric heating pipe are installed in the end portions of the A medium isolation cavity and the B medium isolation cavity through flanges, and the pipe bodies of the partition pipe and the electric heating pipe are inserted into the interiors of the A medium isolation cavity and the B medium isolation cavity.

[0010] Further, the A medium isolation chamber and the B medium isolation chamber are fixed together and are not communicated with each other through the partition plate.

[0011] Further, the inner diameters of the metering chambers and the liquid level control chambers are less than 150 mm, and the outer diameters are less than 157 mm.

[0012] Further, high-viscosity sealing glue is coated between the medium isolation unit in the connecting pipe and the flange, the medium isolation unit is made of soft rubber which is insoluble in water and crude oil, and the medium isolation unit has a water bag structure and has ductility.

[0013] Further, the automatic control system comprises a PLC controller.

[0014] A metering method based on the above-mentioned gas-liquid non-separation weighing method double-chamber tubular metering device, the continuous metering of the liquid medium and the gas is automatically completed under the control of an automatic control system, and the metering method comprises the following calculation method.

[0015] (1) Liquid medium weight calculation: when the A liquid level meter gradually reaches the set value from the starting value, the liquid inlet electric three-way valve and the liquid outlet electric three-way valve are automatically reversed, the A metering chamber is switched from liquid inlet to liquid outlet, and the B metering chamber is switched from liquid outlet to liquid inlet. At this time, according to the pressure balance principle, the weight of the rising height of the isolation liquid in the A liquid level measurement and control chamber is equal to the weight of the liquid medium in the A metering chamber. The mass of the isolation liquid m liquid = ρhS, ρ is the density of the isolation liquid, h is the rising height of the liquid level in the A liquid level measurement and control chamber measured by the A liquid level meter, and S is the cross-sectional area of the A liquid level measurement and control chamber. Thus, m liquid can be calculated, and then W = m liquid g, g is the acceleration of gravity, so the weight W of the isolation liquid, that is, the weight of the liquid medium in the A metering chamber, can be calculated.

[0016] (2) Gas volume calculation: after the A liquid level meter starts from the starting value, the gas in the liquid medium in the A metering chamber rises and enters the B metering chamber through the pressure balance pipe, and forces the B metering chamber to discharge liquid. When the A liquid level meter reaches the set value, the liquid inlet electric three-way valve and the liquid outlet electric three-way valve are automatically reversed, the A metering chamber is switched from liquid inlet to liquid outlet, and the B metering chamber is switched from liquid outlet to liquid inlet. At this time, according to the pressure balance principle, the height difference between the two liquid surfaces in each metering process is used to calculate the gas flow. The daily gas production metering formula is as follows:

[0017] ;

[0018] In the formula, Q is the daily gas production, t / d; m A is the number of times of liquid discharge of the A metering chamber; m B is the number of times of liquid discharge of the B metering chamber; S A is the cross-sectional area of the A metering chamber, mm 2 ; S B is the cross-sectional area of the B metering chamber, mm2 H is the height of the liquid level meter, mm; H Bi H is the height of the liquid level meter, mm; H Ai H is the height of the liquid level meter, mm; H P is the pressure gauge reading, MPa; t is the total time of m times of gas measurement, s.

[0019] Compared with the prior art, the present application has the following beneficial technical effects:

[0020] 1. The present application is based on the weighing type conversion measurement principle of gas-liquid separation, and adopts a parallel measurement double-cavity structure design. It no longer relies on flow meters to measure the liquid volume and gas volume of oil well production, and solves the problem of large measurement error of traditional flow meters when encountering intermittent liquid production, waxing, scaling, gas-water, gas-oil, oil-gas and other special situations.

[0021] 2. The liquid level meter and the electric three-way valve cooperate with each other, based on the set height of the liquid level meter, the electric three-way valve is precisely controlled by the programmable controller, the liquid inlet and liquid outlet are precisely controlled by the electric three-way valve, the oil well can be continuously and automatically measured, and the oil well production data can be real-time reflected.

[0022] 3. The main body of the present application adopts a pipeline with an inner diameter less than 150mm, which belongs to a non-pressure container, does not need annual inspection, has small maintenance amount and low maintenance cost, and is beneficial to oil well production.

[0023] 4. The self-balancing design structure of the gas path U-shaped pipe can ensure that the system pressure is always balanced, ensure that the production will not be affected by unexpected events during measurement, and the liquid volume and gas volume of oil well production during measurement will not affect the pipeline pressure, and there will be no safety problems such as pressure holding.

[0024] 5. The measurement double-cavity can flexibly arrange the number of measurement cavities according to actual needs, can leave sufficient response time for high-precision sensors when the liquid volume of oil well production is large, can accumulate gas to reduce the loss of gas volume when the gas volume of oil well production medium is small, can ensure the measurement accuracy, and ensure the authenticity of oil well production data.

[0025] 6. The present application has reasonable structure, reliable performance and good popularization prospect. DETAILED DESCRIPTION

[0026] Figure 1 is a schematic diagram of the three-dimensional structure of the present application;

[0027] Figure 2 is a left view schematic diagram of the present application;

[0028] Figure 3 is a front view schematic diagram of the present application;

[0029] Figure 4 Fig. 1 is a schematic view of the present application from above;

[0030] Figure 5 Fig. 2 is a schematic view of the present application from the side;

[0031] Fig. 1 is a schematic view of the present application from above; DETAILED DESCRIPTION

[0032] The present application will be described in detail below with reference to specific embodiments and drawings. Example 1

[0033] Reference is made to Figures 1 to 5A gas-liquid non-separation weighing method double-cavity tube type metering device, comprising A metering cavity 16, B metering cavity 17, A liquid level measurement and control cavity 13, B liquid level measurement and control cavity 14, A medium isolation cavity 18, B medium isolation cavity 19, A liquid level meter 3, B liquid level meter 4, pressure balance pipe 10, liquid inlet electric three-way valve 7, liquid outlet electric three-way valve 9, pressure gauge 2 and automatic control system 20; A liquid level meter 3 is installed in A liquid level measurement and control cavity 13 through flange 15, B liquid level meter 4 is installed in B liquid level measurement and control cavity 14 through flange 15; the upper part of A metering cavity 16 and B metering cavity 17 are communicated with pressure balance pipe 10, the lower part of A metering cavity 16 is communicated with A medium isolation cavity 18, the lower part of B metering cavity 17 is communicated with B medium isolation cavity 19; the upper part of A liquid level measurement and control cavity 13 is communicated with pressure balance pipe through connecting pipe 11, the lower part of A liquid level measurement and control cavity is communicated with A medium isolation cavity 18 through connecting pipe 11 and flange 15, medium isolation unit 12 is installed in connecting pipe 11; the upper part of B liquid level measurement and control cavity 14 is communicated with pressure balance pipe 10 through connecting pipe 11, the lower part of B liquid level measurement and control cavity 14 is communicated with B medium isolation cavity 19 through connecting pipe 11 and flange 15, medium isolation unit 12 is installed in connecting pipe 11; liquid inlet electric three-way valve 7 is connected with the upper part of A metering cavity 16 and B metering cavity 17 through liquid inlet connecting pipe 6 and flange 15 respectively, liquid outlet electric three-way valve 9 is connected with the lower part of A metering cavity 16 and B metering cavity 17 through liquid outlet connecting pipe 8 and flange 15 respectively; A liquid level measurement and control cavity 13 and A metering cavity 16 constitute U-shaped A hydraulic balance system, B liquid level measurement and control cavity 14 and B metering cavity 17 constitute U-shaped B hydraulic balance system, U-shaped A hydraulic balance system and U-shaped B hydraulic balance system are combined into large U-shaped pressure balance system through pressure balance pipe 10; pressure gauge 2 is installed in pressure balance pipe 10; A liquid level meter 3, B liquid level meter 4, liquid inlet electric three-way valve 7, liquid outlet electric three-way valve 9 and pressure gauge 2 are connected with automatic control system 20 through cable. Example 2

[0034] Referring to Figures 1 to 5A gas-liquid non-separation weighing method double-cavity tubular metering device, based on the technical solution described in Embodiment 1, one or more metering cavities 1 are arranged in each of the A metering cavity 16 and the B metering cavity 17, and the number of metering cavities 1 in the A metering cavity 16 is the same as that in the B metering cavity 17; when multiple metering cavities 1 are arranged in the A metering cavity 16 and the B metering cavity 17, the upper part and the lower part of the A metering cavity 16 are respectively connected to each other through the respective connecting pipes 11 between the metering cavities 1, and the upper part and the lower part of the B metering cavity 17 are respectively connected to each other through the respective connecting pipes 11 between the metering cavities 1. In actual production, optimization design can be carried out according to needs, for example, the metering cavities 1 are arranged in two rows, the first row is sequentially numbered from left to right as No. 1 metering cavity, No. 2 metering cavity, No. 3 metering cavity and No. 4 metering cavity, and the second row is sequentially numbered from left to right as No. 5 metering cavity, No. 6 metering cavity, No. 7 metering cavity and No. 8 metering cavity; among them, No. 1 metering cavity, No. 2 metering cavity, No. 5 metering cavity and No. 6 metering cavity are a group, collectively referred to as A metering cavity; No. 3 metering cavity, No. 4 metering cavity, No. 7 metering cavity and No. 8 metering cavity are a group, collectively referred to as B metering cavity. Such design has compact structure, smooth path and convenient operation. Embodiment 3

[0035] Referring to Figures 1 to 5 A gas-liquid non-separation weighing method double-cavity tubular metering device, based on the technical solution described in Embodiment 1, a liquid level control cavity 21 is arranged outside each metering cavity 1 and communicates with the metering cavity 1, during the switching of the liquid inlet electric three-way valve 7 and the liquid outlet electric three-way valve 9, the liquid level control cavity 21 can delay the surge of the medium during the switching, and prevent the medium from flowing to the pressure balance pipe 10; the pressure balance pipe 10 is arranged as a multi-layer pipe that communicates with each other, the lower layer pipe can play a buffering role, even if a small amount of medium enters, it will quickly fall down, so as to ensure that the medium will not pass through to the upper layer pipe. Embodiment 4

[0036] Referring to Figures 1 to 5 A gas-liquid non-separation weighing method double-cavity tubular metering device, based on the technical solution described in Embodiment 1, the A medium isolation cavity 18 and the B medium isolation cavity 19 are each provided with an electric heating mechanism 5, the electric heating mechanism 5 includes a separation pipe, an electric heating pipe and heat conducting oil, the separation pipe is arranged around the electric heating pipe, the heat conducting oil is filled in the gap between the separation pipe and the electric heating pipe, the head of the separation pipe and the electric heating pipe is installed on the end of the A medium isolation cavity 18 and the B medium isolation cavity 19 through the flange 15, and the pipe body of the separation pipe and the electric heating pipe extends into the inside of the A medium isolation cavity 18 and the B medium isolation cavity 19. The electric heating mechanism 5 heats the heat conducting oil through the electric heating pipe, and the heat conducting oil heats the incoming medium in the A medium isolation cavity and the B medium isolation cavity through the separation pipe, which ensures the heating efficiency, effectively prevents the medium from sticking to the wall, ensures the oil temperature, reduces the heat loss, and prolongs the service life of the electric heating pipe. Embodiment 5

[0037] Referring to Figures 1 to 5The gas-liquid non-separation weighing method double-cavity tubular metering device, on the basis of the technical solution described in embodiment 1, the A medium isolation cavity 18 and the B medium isolation cavity 19 are fixed together and are not communicated with each other through a partition plate, which is convenient for mechanical manufacturing. Embodiment 6

[0038] Referring to Figures 1 to 5 The gas-liquid non-separation weighing method double-cavity tubular metering device, on the basis of the technical solution described in embodiment 1, the inner diameters of the metering cavity 1 and the liquid level control cavity 21 are less than 150 mm (preferably 147 mm), and the outer diameters are less than 157 mm. The small-diameter container belongs to a non-pressure container, does not need to be inspected annually, has small maintenance amount and low maintenance cost, and is beneficial to oil well production. Embodiment 7

[0039] Referring to Figures 1 to 5 The gas-liquid non-separation weighing method double-cavity tubular metering device, on the basis of the technical solution described in embodiment 1, high-viscosity sealing glue is coated between the medium isolation unit 12 in the connecting pipe 11 and the flange 15, so as to ensure the sealing of the connection; the material of the medium isolation unit 12 is soft rubber which is insoluble in water and crude oil and resistant to high temperature; the structure of the medium isolation unit 12 is water bag-shaped and has ductility, can reciprocate between the isolation liquid and the oil well production medium, can effectively prevent the liquid medium from being mixed, and effectively protects the A liquid level meter 3 and the B liquid level meter 4 from being corroded by the oil well production medium, thereby prolonging the service life. Embodiment 8

[0040] Referring to Figures 1 to 5 The gas-liquid non-separation weighing method double-cavity tubular metering device, on the basis of the technical solution described in embodiment 1, the automatic control system 20 includes a PLC controller. The PLC controller has high reliability and stability, and is an important tool for realizing automatic continuous metering.

[0041] In order for those skilled in the art to better understand the present application, the basic working principle thereof is briefly introduced as follows:

[0042] The continuous metering oil well medium conveying pipeline is connected to the liquid inlet electric three-way valve 7 through the flange 15, the liquid outlet electric three-way valve 9 is connected to the external conveying pipeline through the flange 15, and the oil well production medium flows into the A metering cavity 16 through the liquid inlet electric three-way valve 7; as the oil well production medium continuously flows in, when the medium in the A metering cavity 16 reaches the set position, the liquid inlet electric three-way valve 7 and the liquid outlet electric three-way valve 9 simultaneously reverse, wherein the liquid inlet electric three-way valve 7 and the liquid outlet electric three-way valve 9 are opposite to each other, the medium flows to the external conveying pipeline through the liquid outlet electric three-way valve 9, and the new medium flows into the B metering cavity 17 through the liquid inlet electric three-way valve 7, so as to complete a cycle, thereby realizing continuous metering.

[0043] The continuous metering of the liquid medium and the gas is automatically completed under the control of an automatic control system, that is, these processes are controlled and calculated by a PLC controller and the like; since the liquid inlet and outlet three-way valves are electric three-way valves, manual participation is not required, and automatic metering is completely achieved. The following calculation methods are included:

[0044] (1) Liquid medium weight calculation: when the A liquid level meter 3 gradually reaches the set value from the starting value, the liquid inlet electric three-way valve 7 and the liquid outlet electric three-way valve 9 are automatically reversed, the A metering cavity 16 is switched from liquid inlet to liquid outlet, and the B metering cavity 17 is switched from liquid outlet to liquid inlet; at this time, according to the pressure balance principle, the weight of the rising height of the isolation liquid in the A liquid level measurement and control cavity 13 is equal to the weight of the liquid medium in the A metering cavity 16; the mass of the isolation liquid mliquid=phS, p is the density of the isolation liquid, h is the rising height of the liquid level of the A liquid level measurement and control cavity 13 measured by the A liquid level meter 3, and S is the cross-sectional area of the A liquid level measurement and control cavity 13; thus, mliquidcan be calculated, and then W=mliquidg, g is the acceleration of gravity, so that the weight W of the isolation liquid, that is, the weight of the liquid medium in the A metering cavity 16, can be calculated; the rest is calculated in the same way;

[0045] (2) Gas volume calculation: after the A liquid level meter 3 starts from the starting value, the gas in the liquid medium in the A metering cavity 16 rises and enters the B metering cavity 17 through the pressure balance pipe 10, and forces the B metering cavity 17 to discharge liquid; when the A liquid level meter 3 reaches the set value, the liquid inlet electric three-way valve 7 and the liquid outlet electric three-way valve 9 are automatically reversed, the A metering cavity 16 is switched from liquid inlet to liquid outlet, and the B metering cavity 17 is switched from liquid outlet to liquid inlet; at this time, according to the pressure balance principle, the height difference between the two liquid levels in each metering process is used to calculate the gas flow, and the daily gas production volume calculation formula is as follows:

[0046] ;

[0047] In the formula, Q is the daily gas production volume, t / d; m A is the number of times of liquid discharge of the A metering cavity 16; m B is the number of times of liquid discharge of the B metering cavity 17; S A is the cross-sectional area of the A metering cavity 16, mm 2 ; S B is the cross-sectional area of the B metering cavity 17, mm 2 ; H is the set calculation height of the A liquid level meter 3 and the B liquid level meter 4, mm; H Bi is the rising height of the liquid level of the B metering cavity in the i-th liquid discharge time of the A metering cavity, mm; H Ai is the rising height of the liquid level of the A metering cavity in the i-th liquid discharge time of the B metering cavity, mm; P is the reading of the pressure gauge 2, MPa; and t is the total time of m times of gas measurement, s.

[0048] The above merely describes preferred embodiments of the present application, and any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method of metrology for a gas-liquid non-separation weighing method dual-chamber tube type metering device, characterized by, The metering method is based on a gas-liquid non-separation weighing method double-cavity tube type metering device, which comprises an A metering cavity, a B metering cavity, an A liquid level measurement and control cavity, a B liquid level measurement and control cavity, an A medium isolation cavity, a B medium isolation cavity, an A liquid level meter, a B liquid level meter, a pressure balance pipe, an inlet liquid electric three-way valve, an outlet liquid electric three-way valve, a pressure gauge and an automatic control system; the A liquid level meter is installed in the A liquid level measurement and control cavity through a flange, and the B liquid level meter is installed in the B liquid level measurement and control cavity through a flange; The upper parts of the A metering cavity and the B metering cavity are communicated with the pressure balance pipe, the lower part of the A metering cavity is communicated with the A medium isolation cavity, and the lower part of the B metering cavity is communicated with the B medium isolation cavity; the upper part of the A liquid level measurement and control cavity is communicated with the pressure balance pipe through a connecting pipe, the lower part of the A liquid level measurement and control cavity is communicated with the A medium isolation cavity through a connecting pipe and a flange, and a medium isolation unit is installed in the connecting pipe; the upper part of the B liquid level measurement and control cavity is communicated with the pressure balance pipe through a connecting pipe, the lower part of the B liquid level measurement and control cavity is communicated with the B medium isolation cavity through a connecting pipe and a flange, and a medium isolation unit is installed in the connecting pipe; the inlet liquid electric three-way valve is connected with the upper parts of the A metering cavity and the B metering cavity through an inlet liquid connecting pipe and a flange, respectively, and the outlet liquid electric three-way valve is connected with the lower parts of the A metering cavity and the B metering cavity through an outlet liquid connecting pipe and a flange, respectively; the A liquid level measurement and control cavity and the A metering cavity constitute a U-shaped A hydraulic balance system, the B liquid level measurement and control cavity and the B metering cavity constitute a U-shaped B hydraulic balance system, and the U-shaped A hydraulic balance system and the U-shaped B hydraulic balance system are combined into a large U-shaped pressure balance system through the pressure balance pipe; the pressure gauge is installed in the pressure balance pipe; the A liquid level meter, the B liquid level meter, the inlet liquid electric three-way valve, the outlet liquid electric three-way valve and the pressure gauge are connected with the automatic control system through cables; The continuous metering of liquid medium and gas is automatically completed under the control of the automatic control system, and the metering method comprises the following steps: (1) liquid medium weight calculation: when the A liquid level meter gradually reaches the set value from the starting value, the inlet liquid electric three-way valve and the outlet liquid electric three-way valve automatically change direction, the A metering cavity changes from liquid inlet to liquid outlet, and the B metering cavity changes from liquid outlet to liquid inlet; at this time, according to the pressure balance principle, the weight of the rising height of the isolation liquid in the A liquid level measurement and control cavity is equal to the weight of the liquid medium in the A metering cavity; the mass of the isolation liquid m liquid = ρhS, ρ is the density of the isolation liquid, h is the rising height of the liquid level in the A liquid level measurement and control cavity measured by the A liquid level meter, and S is the cross-sectional area of the A liquid level measurement and control cavity; thus, m liquid can be calculated, and then W = m liquid g, g is the acceleration of gravity, so the weight W of the isolation liquid, that is, the weight of the liquid medium in the A metering cavity, can be calculated; (2) gas volume calculation: after the A liquid level meter starts from the starting value, the gas in the liquid medium in the A metering cavity rises and enters the B metering cavity through the pressure balance pipe, and forces the B metering cavity to discharge liquid; when the A liquid level meter reaches the set value, the inlet liquid electric three-way valve and the outlet liquid electric three-way valve automatically change direction, the A metering cavity changes from liquid inlet to liquid outlet, and the B metering cavity changes from liquid outlet to liquid inlet; at this time, according to the pressure balance principle, the height difference between the two liquid surfaces in each metering process is used to calculate the gas flow, and the daily gas production metering formula is as follows: ； Where: Q = daily gas production, t / d; m A is the number of times the A measurement chamber is drained; m B is the number of times the B measurement chamber is drained; S A is the cross-sectional area of the A measurement chamber, mm 2 ; S B H is the height of the liquid level meter, mm; H 2 H is the height of the liquid level meter, mm; H Bi H is the height of the liquid level meter, mm; H Ai H is the height of the liquid level meter, mm; H P is the pressure gauge reading, MPa; t is the total time of m measurements, s.

2. The method of claim 1, wherein the method is a method of measuring the amount of a gas-liquid two-phase flow in a double-cavity tube type measuring device using a gas-liquid non-separation weighing method. The A metering cavity and the B metering cavity are each provided with one or more metering cavities, and the number of metering cavities of the A metering cavity is the same as that of the B metering cavity; when the A metering cavity and the B metering cavity are provided with multiple metering cavities, the upper part and the lower part of the A metering cavity are respectively connected to each other through respective connecting pipes, and the upper part and the lower part of the B metering cavity are respectively connected to each other through respective connecting pipes.

3. The method of claim 2, wherein the method further comprises: Each metering cavity is provided with a liquid level control cavity in communication with the metering cavity; and the pressure balance pipes are provided as multiple layers of pipes in communication with each other.

4. The metering method of the dual-cavity tube metering device for gas-liquid non-separation weighing according to claim 1, characterized in that, The A medium isolation cavity and the B medium isolation cavity are each provided with an electric heating mechanism.

5. The method of claim 4, wherein the method further comprises: The electric heating mechanism comprises a partition pipe, an electric heating pipe and heat conducting oil, the partition pipe is arranged at the periphery of the electric heating pipe, the heat conducting oil is filled in the gap between the partition pipe and the electric heating pipe, the head portions of the partition pipe and the electric heating pipe are installed at the end portions of the A medium isolation cavity and the B medium isolation cavity through flanges, and the pipe bodies of the partition pipe and the electric heating pipe extend into the interiors of the A medium isolation cavity and the B medium isolation cavity.

6. The method of claim 1, wherein the method further comprises: The A medium isolation cavity and the B medium isolation cavity are fixed together and are not in communication with each other through a partition plate.

7. The method of claim 3, wherein the method further comprises: The inner diameters of the metering cavities and the liquid level control cavities are each less than 150 mm, and the outer diameters thereof are each less than 157 mm.

8. The method of claim 1, wherein the method further comprises: High-viscosity sealing glue is coated between the medium isolation unit in the connecting pipe and the flange, the medium isolation unit is made of soft rubber which is insoluble in water and insoluble in crude oil, and the medium isolation unit has a water bag-like structure and has ductility.

9. The method of claim 1, wherein the method further comprises: The automatic control system comprises a PLC controller.

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