Two-phase separation three-phase metering device

Abstract

The utility model relates to the field of metering equipment, and discloses a two-phase separation three-phase metering device. The two-phase separation and three-phase metering device comprises a plurality of separation tanks which are vertically arranged, the tops of the separation tanks are communicated with gas outlet pipes, the bottoms of the separation tanks are communicated with liquid outlet pipes, countercurrent plates are arranged in cavities of the separation tanks, overflow pipes are arranged between the adjacent separation tanks, and the overflow pipes are communicated with the gas outlet pipes. According to the two-phase separation three-phase metering device, the inner spaces of the adjacent separation tanks are communicated through the overflow pipes, the connecting parts of the overflow pipes and the separation tanks are located above the countercurrent plates in the separation tanks, and the adaptability of the flow of mixed liquid in the two-phase separation three-phase metering device can be effectively improved in the mode that the multiple stages of separation tanks are arranged and the overflow pipes are arranged between the separation tanks; when different flow changes of mixed liquid at the wellhead of an oil field occur, gas-liquid separation can be effectively carried out, and the accuracy of oil, gas and water three-phase metering is improved.

Description

Technical Field

[0001] The utility model relates to the field of metering equipment, in particular to a two-phase separation three-phase metering device. Background Art

[0002] Oilfield production is the basic data for oilfield development, so wellhead measurement of crude oil is an essential operation. The crude oil produced in the oilfield usually includes three phases: oil, water, and gas. In order to achieve accurate measurement of each phase, the separation of gas and liquid is essential first, so that the gas production and liquid production can be accurately measured, and the oil, water, and gas can be accurately measured. Due to the complexity and variability of oil wells, the flow rate of the mixed liquid in the crude oil produced at different times and the gas-liquid ratio in the mixed liquid vary greatly. The three-phase metering devices commonly used in various oil fields at present have complex structures and obvious limitations in the range of response to the flow changes of the mixed liquid. The mixed liquid flow is often controlled by instruments such as pressure relief valves and barometers. The required equipment and instruments are numerous, the investment is large, and the management and operation are difficult. When the flow rate of the wellhead mixed liquid changes greatly, the gas-liquid two-phase separation often fails to meet the demand, and the gas and liquid cannot be separated in a timely and effective manner, resulting in inaccurate measurement of the three phases of oil, gas, and water. Utility Model Content

[0003] The utility model aims to provide a two-phase separation three-phase metering device with a simple structure, which can meet the gas and liquid separation requirements of mixed liquids with different flow rates at the wellhead of an oil field and increase the accuracy of the three-phase metering of oil, gas and water.

[0004] In order to solve the above technical problems, the implementation method of the utility model provides a technical solution as follows:

[0005] A two-phase separation three-phase metering device comprises a plurality of vertically erected separation tanks, wherein the top of the separation tank is connected to an air outlet pipe, the bottom of the separation tank is connected to a liquid outlet pipe, a countercurrent plate is arranged in the cavity of the separation tank, and overflow pipes are arranged between adjacent separation tanks, the internal spaces of adjacent separation tanks are connected through the overflow pipes, and the connection part between the overflow pipe and the separation tank is located above the countercurrent plate in the separation tank.

[0006] Furthermore, the separation tank includes a primary separation tank and a secondary separation tank, the side wall of the primary separation tank is provided with an inlet pipe, the inlet pipe is located above the overflow pipe, a first overflow pipe is provided between the primary separation tank and the secondary separation tank, and the first overflow pipe is arranged obliquely upward toward the secondary separation tank.

[0007] Furthermore, the separation tank includes a three-stage separation tank and a four-stage separation tank, a second overflow pipe is provided between the two-stage separation tank and the three-stage separation tank, and the second overflow pipe is arranged obliquely upward toward the three-stage separation tank; a third overflow pipe is provided between the three-stage separation tank and the four-stage separation tank, and the third overflow pipe is arranged obliquely upward toward the four-stage separation tank.

[0008] Furthermore, the separation tank includes a primary separation tank and a secondary separation tank. The side wall of the primary separation tank is provided with an inlet pipe, and the inlet pipe is located above the overflow pipe. A first overflow pipe is provided between the primary separation tank and the secondary separation tank, and the first overflow pipe is arranged to be inclined downward toward the secondary separation tank.

[0009] Furthermore, the separation tank includes a three-stage separation tank and a four-stage separation tank, a second overflow pipe is provided between the two-stage separation tank and the three-stage separation tank, and the second overflow pipe is arranged obliquely downward toward the three-stage separation tank; a third overflow pipe is provided between the three-stage separation tank and the four-stage separation tank, and the third overflow pipe is arranged obliquely downward toward the four-stage separation tank.

[0010] Further, the horizontal position of the second overflow pipe is lower than the horizontal position of the first overflow pipe, and the horizontal position of the third overflow pipe is lower than the horizontal position of the second overflow pipe.

[0011] Furthermore, the counterflow plate is provided with a flow-breaking thorn, and the flow-breaking thorn is provided with a sharp portion facing the exhaust pipe.

[0012] Furthermore, a warning device is provided in the overflow pipe, and the warning device can send out a warning signal when the mixed liquid is injected into the adjacent separation tank through the overflow pipe.

[0013] Furthermore, an ultrasonic flowmeter is provided on the air outlet pipe, and a mass flowmeter is provided on the liquid outlet pipe.

[0014] Compared with the prior art, the two-phase separation and three-phase metering device provided by the utility model can effectively increase the adaptability of the flow rate of the mixed liquid in the two-phase separation and three-phase metering device by means of multi-stage separation tanks and the arrangement of overflow pipes between the separation tanks. When faced with different flow changes of the mixed liquid at the wellhead of the oil field, it can effectively separate gas and liquid, and increase the accuracy of the three-phase metering of oil, gas and water. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0016] Figure 1It is a schematic structural diagram of a two-phase separation three-phase metering device according to the first embodiment of the utility model;

[0017] Figure 2 This is a schematic structural diagram of a two-phase separation three-phase metering device according to a second embodiment of the present utility model;

[0018] Figure 3 It is a schematic structural diagram of a two-phase separation three-phase metering device according to a third embodiment of the utility model;

[0019] Figure 4 It is a schematic structural diagram of a two-phase separation three-phase metering device according to a fourth embodiment of the present utility model.

[0020] Explanation of the reference numerals: 1. inlet pipe; 2. separation tank; 21. primary separation tank; 22. secondary separation tank; 23. tertiary separation tank; 24. quaternary separation tank; 3. countercurrent plate; 31. first countercurrent plate; 32. second countercurrent plate; 33. third countercurrent plate; 34. fourth countercurrent plate; 4. flow-breaking thorn; 5. overflow pipe; 51. first overflow pipe; 511. first overflow port; 512. second overflow port; 52. second overflow pipe; 53. third overflow pipe; 6. warning device; 7. air outlet pipe; 8. liquid outlet pipe; 9. ultrasonic flow meter; 10. mass flow meter. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the utility model clearer, the various embodiments of the utility model will be described in detail below with reference to the accompanying drawings. However, it can be understood by those skilled in the art that in the various embodiments of the utility model, many technical details are provided in order to enable readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical schemes claimed for protection in the claims of the present application can be implemented.

[0022] like Figure 1-4 As shown, the utility model relates to a two-phase separation three-phase metering device, including a plurality of vertically erected separation tanks 2, a countercurrent plate 3 is provided in the cavity of the separation tank 2, an overflow pipe 5 is provided between adjacent separation tanks 2, the overflow pipe 5 connects the internal spaces of adjacent separation tanks 2, and the connection between the overflow pipe 5 and the separation tank 2 is higher than the position of the countercurrent plate 3 in the separation tank 2.

[0023] like Figure 1As shown, the first embodiment of the utility model relates to a two-phase separation three-phase metering device, comprising two separation tanks 2, which are a first-stage separation tank 21 and a second-stage separation tank 22 arranged in sequence, wherein the first-stage separation tank 21 is provided with a first countercurrent plate 31, and the second-stage separation tank 22 is provided with a second countercurrent plate 32; the top of the separation tank is connected with an air outlet pipe 7, and an ultrasonic flowmeter 9 is provided on the air outlet pipe 7, and the ultrasonic flowmeter 9 is used for gas metering; the bottom of the separation tank is connected with a liquid outlet pipe 8, and a mass flowmeter 10 is provided on the liquid outlet pipe 8, and the mass flowmeter 10 can measure the liquid and measure and output the oil and water in the liquid according to the water content in the liquid; the upper end side wall of the first-stage separation tank 21 is connected with an inlet pipe 1, and the oilfield wellhead mixed liquid is connected with the first-stage separation tank 21 through the inlet pipe 1, and the mixed liquid is injected into the first-stage separation tank 21 through the inlet pipe 1, and the first A first countercurrent plate 31 is provided in the cavity of the separation tank 21. The first countercurrent plate 31 is located below the inlet pipe 1. A flow-breaking thorn 4 is provided on the first countercurrent plate 31. The flow-breaking thorn 4 is conical, and the sharp part of the cone is arranged toward the outlet pipe 7. After the mixed liquid is injected into the primary separation tank 21 through the inlet pipe 1, it flows to the bottom of the primary separation tank 21 under the action of gravity, and is intercepted and impacted by the first countercurrent plate 31. The impact, flow breaking and combing of the mixed liquid by the first countercurrent plate 31 enable the gas in the mixed liquid to be effectively separated from the liquid. The separated gas flows to the top of the primary separation tank 21, and is discharged through the outlet pipe 7 connected to the top of the primary separation tank 21. The gas is measured by the ultrasonic flowmeter 9. The separated liquid flows to the bottom of the primary separation tank 21, flows out through the liquid outlet pipe 8, and the oil and water in the liquid are measured after passing through the mass flowmeter 10. Thus, the three-phase metering operation of gas, water and oil in the inlet mixed liquid is completed.

[0024] A first overflow pipe 51 is obliquely arranged between the primary separation tank 21 and the secondary separation tank 22. The first overflow pipe 51 is located below the inlet pipe 1. The connection between the first overflow pipe 51 and the primary separation tank 21 is a first overflow port 511. The connection between the first overflow pipe 51 and the secondary separation tank 22 is a first overflow port 512. The first overflow port 511 is arranged above the first countercurrent plate 31. The first overflow port 512 is arranged higher than the first overflow port 511. The first overflow pipe 51 is obliquely arranged upward toward the secondary separation tank 22. Since the inlet pipe 1 is located above the first overflow pipe 51, when the mixed liquid flow rate is large and there is too much mixed liquid in the primary separation tank 21 to be separated and discharged in time, the mixed liquid can be discharged through the first overflow pipe 511. 1 flows into the secondary separation tank 22, and the mixed liquid entering the secondary separation tank 22 flows to the second countercurrent plate 32 arranged in the secondary separation tank 22 under the action of gravity. After the impact, flow breaking and combing of the second countercurrent plate 32, the gas in the mixed liquid can be effectively separated from the liquid. The separated gas flows to the top of the secondary separation tank 22, is discharged through the gas outlet pipe 7 connected to the top of the secondary separation tank 22, and is measured by the ultrasonic flowmeter 9. The separated liquid flows to the bottom of the secondary separation tank 22, flows out through the liquid outlet pipe 8, and is measured by the mass flowmeter 10. Preferably, a warning device 6 is also provided in the first overflow pipe 51, and the warning device 6 can send a warning signal when the mixed liquid overflows to the secondary separation tank 22 through the first overflow pipe 51, so as to remind the staff to make adjustments and controls in time. Through the primary separation tank 21, the secondary separation tank 22 and the first overflow pipe 51 arranged between the primary separation tank 21 and the secondary separation tank 22, it is possible to effectively avoid the mixed liquid being discharged directly from the outlet pipe 7 without gas-liquid separation due to the capacity problem of the primary separation tank 21, thereby affecting the accuracy of separation and metering.

[0025] like Figure 2As shown, the first embodiment of the utility model relates to a two-phase separation three-phase metering device, which has four separation tanks, namely, a first-stage separation tank 21, a second-stage separation tank 22, a third-stage separation tank 23, and a fourth-stage separation tank 24, which are arranged in sequence. The first-stage separation tank 21 is provided with a first countercurrent plate 31, the second-stage separation tank 22 is provided with a second countercurrent plate 32, the third-stage separation tank 23 is provided with a third countercurrent plate 33, and the fourth-stage separation tank 24 is provided with a fourth countercurrent plate 34; the top of the separation tank is connected to an air outlet pipe 7, and an ultrasonic flowmeter 9 is provided on the air outlet pipe 7, and the ultrasonic flowmeter 9 is used for gas metering; the bottom of the separation tank is connected to a liquid outlet pipe 8, and a mass flowmeter 10 is provided on the liquid outlet pipe 8, and the mass flowmeter 10 is provided on the mass flowmeter 10. The meter 10 can measure the liquid and measure and output the oil and water in the liquid according to the water content in the liquid; a first overflow pipe 51 is obliquely arranged between the primary separation tank 21 and the secondary separation tank 22, a second overflow pipe 52 is obliquely arranged between the secondary separation tank 22 and the tertiary separation tank 23, and a third overflow pipe 53 is obliquely arranged between the tertiary separation tank 23 and the quaternary separation tank 24. The second overflow pipe 52 and the third overflow pipe 53 are arranged in the same manner as the first overflow pipe 51. The mixed liquid in the secondary separation tank 22 can overflow to the tertiary separation tank 23 through the second overflow pipe 52, and the mixed liquid in the tertiary separation tank 23 can overflow to the quaternary separation tank 24 through the third overflow pipe 53. Of course, according to design requirements, the separation tank 2 can also be set to three or more than four.

[0026] like Figure 3 As shown, the third embodiment of the utility model relates to a two-phase separation three-phase metering device, which is different from the first embodiment in that the inclined setting mode of the first overflow pipe 51 and the position of the countercurrent plate 3 are different. In the third embodiment, the horizontal position of the first overflow port 511 of the first overflow pipe 51 is higher than the position of the first overflow port 512, that is, the first overflow pipe 51 is inclined downward toward the secondary separation tank 22. Compared with the first embodiment, the setting mode of the first overflow pipe 51 enables the mixed liquid in the primary separation tank 21 to overflow to the secondary separation tank 22 more promptly and smoothly, and can also divert the mixed liquid injected into the primary separation tank 21 to the secondary separation tank 22 through the first overflow pipe 51. The third embodiment relates to a two-phase separation three-phase metering device, comprising two separation tanks 2, which are a primary separation tank 21 and a secondary separation tank 22 arranged in sequence. The top of the separation tank 2 is connected to a gas outlet pipe 7, and an ultrasonic flowmeter 9 is arranged on the gas outlet pipe 7. The ultrasonic flowmeter 9 is used for gas metering; the bottom of the separation tank 2 is connected to a liquid outlet pipe 8, and a mass flowmeter 10 is arranged on the liquid outlet pipe 8. The mass flowmeter 10 can measure the liquid and measure and output the oil and water in the liquid according to the water content in the liquid.

[0027] A first overflow pipe 51 is obliquely arranged between the primary separation tank 21 and the secondary separation tank 22, the connection portion of the first overflow pipe 51 and the primary separation tank 21 is a first overflow port 511, the connection portion of the first overflow pipe 51 and the secondary separation tank 22 is a first overflow port 512, the position of the first overflow port 511 is arranged above the first countercurrent plate 31, the position of the first overflow port 511 is higher than the first overflow port 512, and the position of the first overflow port 512 is higher than the position of the second countercurrent plate 32, so that when the mixed liquid flow rate is large and there is too much mixed liquid in the primary separation tank 21 to be separated and discharged in time, the mixed liquid can flow into the secondary separation tank 22 through the first overflow pipe 51, and can also flow into the secondary separation tank 22 through the first overflow pipe 51 after the mixed liquid is injected into the primary separation tank 21, and the mixed liquid flows to the first countercurrent plate 31 through the first overflow pipe 512. The overflow pipe 51 is diverted to the secondary separation tank 22; the mixed liquid entering the secondary separation tank 22 flows to the second countercurrent plate 32 arranged in the secondary separation tank 22 under the action of gravity, and the gas in the mixed liquid can be effectively separated from the liquid after impact, flow breaking and combing by the second countercurrent plate 32, and the separated gas flows to the top of the secondary separation tank 22, and is discharged through the outlet pipe 7 connected to the top of the secondary separation tank 22, and is measured by the ultrasonic flowmeter 9, and the separated liquid flows to the bottom of the secondary separation tank 22, flows out through the liquid outlet pipe 8, and is measured by the mass flowmeter 10; preferably, a warning device 6 is also provided in the first overflow pipe 51, and the warning device 6 can send a warning signal when the mixed liquid overflows to the secondary separation tank 22 through the first overflow pipe 51, so as to remind the staff to make adjustments and controls in time.

[0028] like Figure 4As shown, the fourth embodiment of the utility model relates to a two-phase separation three-phase metering device, which is different from the second embodiment in that the first overflow pipe 51, the second overflow pipe 52, and the third overflow pipe 53 are arranged in an inclined manner and the position of the countercurrent plate 3 is different. The connection part of the first overflow pipe 51 and the first separation tank 21 is a first overflow port 511, and the connection part of the first overflow pipe 51 and the second separation tank 22 is a first overflow port 512. The position of the first overflow port 511 is arranged above the first countercurrent plate 31, and the position of the first overflow port 511 is higher than the first overflow port 512. The first overflow pipe 51 is arranged obliquely downward toward the secondary separation tank 22, the second overflow pipe 52 and the third overflow pipe 53 are arranged parallel to the first overflow pipe 51, the horizontal position of the second overflow pipe 52 is lower than the horizontal position of the first overflow pipe 51, and the horizontal position of the third overflow pipe 53 is lower than the horizontal position of the second overflow pipe 52, that is, along the flow direction of the mixed liquid, the horizontal positions of the overflow pipe 5 and the countercurrent plate 3 are gradually reduced, so that the mixed liquid can overflow from the upper-stage separation tank 21 to the lower-stage separation tank 21 more promptly and smoothly, thereby increasing the gas-liquid separation effect of the mixed liquid.

[0029] Compared with the prior art, the two-phase separation and three-phase metering device provided by the utility model can effectively increase the adaptability of the flow rate of the mixed liquid in the two-phase separation and three-phase metering device by means of multi-stage separation tanks and the arrangement of overflow pipes between the separation tanks. When faced with different flow changes of the mixed liquid at the wellhead of the oil field, it can effectively separate gas and liquid, and increase the accuracy of the three-phase metering of oil, gas and water.

[0030] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A two-phase separation three-phase metering device, characterized in that: It comprises a plurality of vertically erected separation tanks, wherein the top of the separation tank is connected with an air outlet pipe, the bottom of the separation tank is connected with a liquid outlet pipe, a countercurrent plate is arranged in the cavity of the separation tank, and overflow pipes are arranged between adjacent separation tanks, the internal spaces of adjacent separation tanks are connected through the overflow pipes, and the connection part between the overflow pipe and the separation tank is located above the countercurrent plate in the separation tank.

2. A two-phase separation three-phase metering device according to claim 1, characterized in that: The separation tank includes a primary separation tank and a secondary separation tank. The side wall of the primary separation tank is provided with an inlet pipe, and the inlet pipe is located above the overflow pipe. A first overflow pipe is provided between the primary separation tank and the secondary separation tank, and the first overflow pipe is arranged obliquely upward toward the secondary separation tank.

3. A two-phase separation three-phase metering device according to claim 2, characterized in that: The separation tank includes a three-stage separation tank and a four-stage separation tank. A second overflow pipe is provided between the two-stage separation tank and the three-stage separation tank, and the second overflow pipe is arranged obliquely upward toward the three-stage separation tank. A third overflow pipe is provided between the three-stage separation tank and the four-stage separation tank, and the third overflow pipe is arranged obliquely upward toward the four-stage separation tank.

4. A two-phase separation three-phase metering device according to claim 1, characterized in that: The separation tank includes a primary separation tank and a secondary separation tank. The side wall of the primary separation tank is provided with an inlet pipe, and the inlet pipe is located above the overflow pipe. A first overflow pipe is provided between the primary separation tank and the secondary separation tank, and the first overflow pipe is arranged obliquely downward toward the secondary separation tank.

5. A two-phase separation three-phase metering device according to claim 4, characterized in that: The separation tank includes a three-stage separation tank and a four-stage separation tank. A second overflow pipe is provided between the two-stage separation tank and the three-stage separation tank, and the second overflow pipe is arranged obliquely downward toward the three-stage separation tank. A third overflow pipe is provided between the three-stage separation tank and the four-stage separation tank, and the third overflow pipe is arranged obliquely downward toward the four-stage separation tank.

6. A two-phase separation three-phase metering device according to claim 5, characterized in that: The horizontal position of the second overflow pipe is lower than that of the first overflow pipe, and the horizontal position of the third overflow pipe is lower than that of the second overflow pipe.

7. A two-phase separation three-phase metering device according to claim 1, characterized in that: The counterflow plate is provided with flow-breaking thorns, and the flow-breaking thorns are provided with sharp portions facing the exhaust pipe.

8. A two-phase separation three-phase metering device according to any one of claims 1 to 7, characterized in that: A warning device is arranged in the overflow pipe, and the warning device can send out a warning signal when the mixed liquid is injected into the adjacent separation tank through the overflow pipe.

9. A two-phase separation three-phase metering device according to any one of claims 1 to 7, characterized in that: The air outlet pipe is provided with an ultrasonic flow meter, and the liquid outlet pipe is provided with a mass flow meter.

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