A continuous metering device for oil and gas multiphase separation

Abstract

The present invention discloses a continuous metering device for multiphase separation of oil and gas, including: a separation tank, which is provided with an oil and gas separation element and a water bag inside, and an intelligent magnetic flap level gauge connected to the upper and lower parts of the separation tank on the outer side of the separation tank; an oil inlet pipeline and a confluence pipeline are also provided on the separation tank, and an anti-overflow device is arranged on the confluence pipeline; an air outlet pipeline is respectively connected to the upper part of the separation tank and the confluence pipeline, and a temperature transmitter, a pressure transmitter, and a liquid pressure valve are arranged on the air outlet pipeline; a control cabinet, the oil inlet pipeline is connected to the well selection device, and the control cabinet is connected to the well selection device, the magnetic flap level gauge and the liquid pressure valve, which are used for well selection, data remote transmission and remote monitoring. The present invention realizes the metering of gas and liquid phases without a single-phase instrument through the anti-overflow device, the intelligent magnetic flap level gauge and the pressure transmitter and temperature transmitter on the air outlet pipeline, in cooperation with the metering program, and is simple to operate, and solves the problems of regular instrument calibration, intermittent liquid and large fluctuation of liquid volume overflowing the tank.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas metering, and in particular to an oil and gas multiphase separation continuous metering device. Background Art

[0002] Oil and gas metering refers to the measurement of oil and natural gas flow. It is mainly divided into oil well production metering and external flow metering. Oil well production metering refers to the measurement of the amount of oil and gas produced by a single well. It is the key data for oil well management and understanding of oil layer dynamics. It is the first-hand data for reservoir dynamic analysis and directly affects the direction of reservoir development. Therefore, the accuracy of oil and gas metering is particularly important.

[0003] Due to the influence of complex factors such as the properties of crude oil, differences in water and gas content, and irregular production of liquid, oil and gas metering has problems of complex structure and poor versatility in actual application. This problem is particularly prominent in oil wells with intermittent oil supply, little gas, and large fluctuations in liquid supply. When the amount of incoming liquid is small, inaccurate metering is prone to occur; when the amount of incoming liquid is large, the control valve has problems such as long action time and easy flooding. Therefore, for remote areas, single-phase flow metering instruments need to be calibrated every year. The workload of instrument calibration is large. If there is no suitable replacement instrument during the calibration process, production needs to be stopped or metering needs not be performed, affecting the normal production order of the oil well.

[0004] In view of this, an oil and gas multiphase separation continuous metering device is urgently needed to solve the problem that the intermittent liquid in the continuous metering process of the oil well is prone to overflowing the tank and the instrument calibration workload in remote areas is large, affecting the normal production order. Summary of the invention

[0005] The technical problem to be solved by the present invention is that the existing oil well metering device is easily affected by various factors, easily overflows the tank, and the workload of instrument calibration in remote areas is large, affecting the normal production order.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0007] An oil-gas multiphase separation continuous metering device, comprising:

[0008] A separation tank, wherein an oil-gas separation element and a water bag are arranged inside the separation tank, wherein the water bag is arranged along the lower part of the separation tank, and an intelligent magnetic flap level gauge is also arranged on the outer side of the separation tank, wherein the upper end and the lower end of the intelligent magnetic flap level gauge are respectively connected with the gas phase space above the separation tank and the water bag; an oil inlet pipeline is also arranged at the upper part of the separation tank, and a confluence pipeline is arranged at the lower part, and an oil inlet control valve and an oil outlet control valve are arranged on the oil inlet pipeline and the confluence pipeline;

[0009] An overflow prevention device is arranged on the confluence pipeline, and the separation tank is connected with the confluence pipeline through the overflow prevention device;

[0010] An air outlet pipeline is respectively connected to the upper part of the separation tank and the confluence pipeline, and a liquid pressure valve is provided on the air outlet pipeline;

[0011] The control cabinet, the oil inlet pipeline is connected with the well selection device, the control cabinet is controlled by PLC and has a built-in metering program, the control cabinet is connected with the well selection device, the intelligent magnetic flap level gauge, the oil inlet control valve, the oil outlet control valve and the liquid pressure valve, and is used for well selection, remote data transmission and remote monitoring.

[0012] In the above scheme, preferably, the inlet of the separation tank is arranged along the tangent direction of the separation tank, the separation element includes a separation umbrella and an oil baffle cap, and the top and bottom of the separation tank are respectively provided with a gas separation outlet and a liquid separation outlet.

[0013] In the above scheme, preferably, the anti-overflow device is an inverted U-shaped tube, and the inlet end and the outlet end of the U-shaped tube are respectively connected to the lower end of the separation tank and the confluence pipeline.

[0014] In the above scheme, preferably, the separation tank is further provided with a sewage pipe, the sewage pipe is connected to the bottom of the separation tank, and the sewage pipe is provided with a separation tank sewage valve.

[0015] In the above scheme, preferably, it also includes:

[0016] The skid block, the separation tank is installed on the top surface of the skid block through a separation tank bracket, and the anti-overflow device and the confluence pipeline are fixed on the skid block through a pipeline mounting frame.

[0017] In the above scheme, preferably, the control cabinet also has a built-in pressure and temperature compensation program, which performs pressure and temperature compensation according to the pressure and temperature data obtained by the pressure transmitter and the temperature transmitter, and determines the gas production in conjunction with the metering program.

[0018] In the above scheme, preferably, antifreeze liquid is provided in the water bag.

[0019] Compared with the prior art, the oil-gas multiphase separation continuous metering device provided by the present invention measures the liquid level change in the separation tank by means of an intelligent magnetic flap level gauge connected to the separation tank to measure the liquid phase flow rate, and controls the pressure change in the separation tank by means of a pressure liquid valve on the gas outlet pipeline to measure the gas phase flow rate, thereby achieving separate metering of the liquid flow rate and the gas flow rate. In this process, there is no need to set up a separate gas flow metering device, which greatly reduces the structural complexity of the oil and gas metering equipment and saves the space occupied by the metering equipment, and has the advantages of reducing metering costs and improving metering efficiency. At the same time, there is no need to calibrate the single-phase instrument on site, and only the calibrated pressure instrument needs to be replaced.

[0020] An anti-overflow device is installed on the confluence pipeline to effectively solve the problem of oil overflowing the tank due to excessive incoming liquid during the metering process, thereby improving the accuracy of the oil and gas metering results.

[0021] In the present invention, the control cabinet is connected with the intelligent magnetic flap level gauge, oil inlet control valve, oil outlet control valve and liquid pressure valve, which can realize automatic well selection, remote data transmission and remote monitoring, improve the intelligence and automation of oil and gas metering, reduce the work intensity of staff, and improve the efficiency of recording and monitoring of metering data. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front view of the oil-gas multiphase separation continuous metering device of the present invention;

[0023] Figure 2 It is a side view of the oil-gas multiphase separation continuous metering device of the present invention;

[0024] Figure 3 A top view of the oil-gas multiphase separation continuous metering device of the present invention;

[0025] Figure 4 A top view of the confluence pipeline in the present invention;

[0026] Figure 5 It is a top view of the sewage pipe in the present invention.

[0027] in, Figures 1 to 5 The corresponding relationship between the names of the components and the reference numerals is as follows:

[0028] Separation tank 1, oil inlet pipeline 2, confluence pipeline 3, overflow prevention device 4, air outlet pipeline 5, oil inlet control valve 21, oil outlet control valve 31, water bag 12, intelligent magnetic flap level gauge 7, drain pipe 13, separation tank drain valve 131, pressure valve 51, pressure transmitter 52, temperature transmitter 53, safety valve port 54, metering station housing 8, skid base 81, support frame 82, separation tank bracket 83, pipe bracket 84, control cabinet 85, explosion-proof heating device 86. DETAILED DESCRIPTION

[0029] The present invention provides an oil-gas multiphase separation continuous metering device, which has a simple structure and is easy to operate, effectively solves the tank overflow problem in the oil-gas metering process, and greatly improves the convenience and metering efficiency of oil-gas metering and the accuracy of metering results. The present invention is described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] like Figure 1 , Figure 2 and Figure 3 as well as Figure 4 As shown, the oil-gas multiphase separation continuous metering device provided by the present invention includes a separation tank 1, on which an oil inlet pipeline 2 and a confluence pipeline 3 are provided, and also includes an overflow prevention device 4 and an air outlet pipeline 5 arranged on the separation tank 1.

[0031] An oil-gas separation element is provided in the separation tank 1, and the oil-gas separation element is a separation umbrella and an oil baffle cap. The inlet of the separation tank is arranged along the tangential direction of the separation tank 1, so that the oil enters along the tangential direction of the separation tank 1, thereby improving the separation effect of the oil in the separation tank 1. A gas separation outlet and a liquid separation outlet are provided at the top and bottom of the separation tank 1, respectively. An oil inlet control valve 21 and an oil outlet control valve 31 are provided on the oil inlet pipeline 2 and the confluence pipeline 3, respectively.

[0032] A water bag 12 is also provided in the separation tank 1. The water bag 12 is arranged along the lower part of the separation tank 1. An intelligent magnetic flap liquid level gauge 7 is provided on the outer side of the separation tank 1. The upper end of the intelligent magnetic flap liquid level gauge 7 is connected to the upper part of the separation tank 1, and the lower end of the intelligent magnetic flap liquid level gauge 7 is connected to the water bag 12. When the liquid level of the separation tank 1 changes, the water in the water bag 12 cooperates with the intelligent magnetic flap liquid level gauge 7 to display the liquid level change of the separation tank 1.

[0033] like Figure 5 As shown, the separation tank 1 is also provided with a sewage pipe 13 , which is communicated with the bottom of the separation tank 1 , and a separation tank sewage valve 131 is provided on the sewage pipe 13 for discharging dirt in the separation tank 1 .

[0034] The overflow prevention device 4 is arranged on the confluence pipeline 3 . The overflow prevention device 4 is an inverted U-shaped tube. The inlet end and the outlet end of the U-shaped tube are connected to the lower end of the separation tank 1 and the confluence pipeline 3 respectively.

[0035] The gas outlet pipeline 5 is connected to the upper part of the separation tank 1 and the confluence pipeline 3 respectively. The connection end of the gas outlet pipeline 5 and the confluence pipeline 3 is arranged at the outlet side of the overflow prevention device 4, so that the confluence pipeline 3 and the separation tank 1 form a communicating vessel. The gas outlet pipeline 5 is provided with a pressure valve 51, and the on-off condition of the gas outlet pipeline 5 and the confluence pipeline 3 can be adjusted by the pressure valve 51. The gas outlet pipeline 5 is also provided with a pressure transmitter 52 and a temperature transmitter 53 for recording pressure and temperature data. A safety valve 54 is provided at the outlet end of the gas outlet pipeline 5 to control the gas outlet condition of the gas outlet pipeline 5.

[0036] The oil-gas multiphase separation continuous metering device is arranged in the metering station housing 8, which includes a skid base 81 and a support frame 82 arranged on the skid base 81, the separation tank 1 is installed on the top surface of the skid base 81 through a separation tank support 83, and the overflow prevention device 4 and the confluence pipeline 3 are fixed on the skid base 81 through a pipeline support 84. A windshield is installed on the support frame 82.

[0037] A control cabinet 85 is also provided in the housing 8 of the metering station. The oil inlet pipeline 2 is connected to the well selection device (not shown in the figure). The control cabinet 85 is controlled by a PLC and has a built-in metering program. The control cabinet 85 is connected to the well selection device, the intelligent magnetic flap level gauge 7, the pressure transmitter 52, the temperature transmitter 53 and the pressure valve 51 for well selection, metering, data processing, data remote transmission and remote monitoring. The control cabinet 85 also has a built-in pressure and temperature compensation program, which performs pressure and temperature compensation according to the pressure and temperature data obtained by the pressure transmitter 52 and the temperature transmitter 53, and determines the gas production in conjunction with the metering program.

[0038] The water bag 12 is provided with antifreeze liquid, and the metering station housing is also provided with an explosion-proof heating device 86, which is arranged on one side of the separation tank 1 to prevent the normal operation of the metering device from being affected by excessively low temperature.

[0039] The working process of the present invention is as follows:

[0040] The crude oil from the oil well enters the separation tank 1 through the oil inlet pipeline 2, and the gas-liquid two-phase is separated by the cyclone in the separation tank 1. Since the separation tank 1 is connected to the upper and lower parts of the intelligent magnetic flap liquid level gauge 7 to form a communicating vessel, the pressure of the liquid column in the separation tank 1 will be transmitted to the intelligent magnetic flap liquid level gauge 7 through the water bag 12, so that the pressure of the two liquid columns is balanced. Therefore, when the liquid column in the separation tank rises to a certain height, the water column in the intelligent magnetic flap liquid level gauge 7 also rises to a certain height accordingly. However, due to the different densities of crude oil and antifreeze, the rising heights of the liquid column in the separation tank 1 and the water column in the intelligent magnetic flap liquid level gauge 7 are also different. According to the height of the water column in the intelligent magnetic flap liquid level gauge 7, the rising height of the liquid column in the separation tank 1 is calculated, and combined with the time required for the water column in the intelligent magnetic flap liquid level gauge 7 to rise as recorded by the control cabinet 85, the weight of the liquid column in the separation tank 1 can be calculated, and the daily output of the well can be calculated.

[0041] When the gas needs to be metered and the liquid level in the separation tank 1 reaches the highest level, the control cabinet 85 controls the liquid pressure valve 51 on the gas outlet pipeline 5 to close, so that the gas in the separation tank 1 continues to accumulate, the gas pressure in the separation tank 1 increases, and the liquid level in the separation tank 1 continues to move downward. At this time, since the liquid pressure valve 51 is closed, the separation tank 1 and the intelligent magnetic flap liquid level gauge 7 cannot form a communicating vessel. As the liquid level in the separation tank 1 moves downward, the liquid level in the magnetic flap liquid level gauge 7 moves upward. When the liquid level in the separation tank 1 moves downward to the lowest level, the gas volume flow rate in the separation tank 1 can be calculated based on the time required from the highest level to the lowest level.

[0042] The control cabinet 85 is controlled by PLC and has a built-in temperature and pressure self-compensation program. According to the pressure and temperature data obtained by the pressure transmitter 52 and the temperature transmitter 53 on the outlet pipeline 5, the flow rate can be corrected according to parameters such as operating temperature and pressure, thereby ensuring the accuracy of the measurement results.

[0043] Compared with the prior art, the oil-gas multiphase separation continuous metering device provided by the present invention can achieve the metering of the oil and gas flow rate of the oil well only through the separation tank, the intelligent magnetic flap level gauge and the gas outlet pipeline and the pressure liquid valve arranged on the gas outlet pipeline. It has a simple structure, convenient operation, and is controlled by the control cabinet, which improves the intelligence and automation of the metering. The metering device is provided with an overflow prevention device on the confluence pipeline, and forms a communicating vessel with the separation tank through the gas outlet pipeline, so that when the liquid from a single well is too large, the liquid level of the separation tank and the overflow prevention device is kept the same, thereby effectively avoiding accidents caused by oil overflowing the separator.

[0044] In the present invention, the control cabinet is controlled by PLC, connected to the pressure transmitter and temperature transmitter on the air outlet pipeline, and has a built-in self-compensation program, which can automatically compensate the metering results according to different working conditions, thereby ensuring accurate metering of the metering device under various working conditions.

[0045] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone should be aware that any structural changes made under the inspiration of the present invention, and any technical solutions that are the same or similar to the present invention, fall within the protection scope of the present invention.

Claims

1. An oil-gas multiphase separation continuous metering device, characterized in that: include: A separation tank, wherein an oil-gas separation element and a water bag are arranged inside the separation tank, wherein the water bag is arranged along the lower part of the separation tank, and an intelligent magnetic flap level gauge is also arranged on the outer side of the separation tank, wherein the upper end and the lower end of the intelligent magnetic flap level gauge are respectively connected with the gas phase space above the separation tank and the water bag; an oil inlet pipeline is also arranged at the upper part of the separation tank, and a confluence pipeline is arranged at the lower part, and an oil inlet control valve and an oil outlet control valve are arranged on the oil inlet pipeline and the confluence pipeline; An overflow prevention device is arranged on the confluence pipeline, and the separation tank is connected with the confluence pipeline through the overflow prevention device; The gas outlet pipeline is connected to the upper part of the separation tank and the confluence pipeline respectively, and the connection end of the gas outlet pipeline and the confluence pipeline is arranged on the outlet side of the anti-overflow device; the gas outlet pipeline is provided with a pressure valve for adjusting the on-off condition of the gas outlet pipeline and the confluence pipeline; the gas outlet pipeline is provided with a pressure transmitter and a temperature transmitter; A control cabinet, wherein the oil inlet pipeline is connected to the well selection device, the control cabinet is controlled by a PLC and has a built-in metering program, and the control cabinet is connected to the well selection device, the intelligent magnetic flap level gauge, the pressure transmitter, the temperature transmitter and the pressure valve for well selection, metering, data processing, remote transmission and remote monitoring; The anti-overflow device is an inverted U-shaped tube, and the inlet end and the outlet end of the U-shaped tube are respectively connected to the lower end of the separation tank and the confluence pipeline.

2. The oil-gas multiphase separation continuous metering device according to claim 1, characterized in that: The inlet of the separation tank is arranged along the tangent direction of the separation tank, the separation element comprises a separation umbrella and an oil retaining cap, and the top and bottom of the separation tank are respectively provided with a gas separation outlet and a liquid separation outlet.

3. The oil-gas multiphase separation continuous metering device according to claim 1, characterized in that: The separation tank is also provided with a sewage pipe, the sewage pipe is communicated with the bottom of the separation tank, and the sewage pipe is provided with a separation tank sewage valve.

4. The oil-gas multiphase separation continuous metering device according to claim 1, characterized in that: Also includes: The skid block, the separation tank is installed on the top surface of the skid block through a separation tank bracket, and the anti-overflow device and the confluence pipeline are fixed on the skid block through a pipeline mounting frame.

5. The oil-gas multiphase separation continuous metering device according to claim 1, characterized in that: The control cabinet also has a built-in pressure and temperature compensation program, which performs pressure and temperature compensation according to the pressure and temperature data obtained by the pressure transmitter and the temperature transmitter, and measures the gas production in conjunction with the metering program.

6. The oil-gas multiphase separation continuous metering device according to claim 1, characterized in that: Antifreeze liquid is arranged in the water bag.

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