Gas-liquid two-phase separation device

Abstract

The utility model relates to the technical field of oil field equipment, and discloses a gas-liquid two-phase separation device. The gas-liquid two-phase separation device comprises a gas eliminator, the side face of the gas eliminator is provided with an inlet pipe communicated with an oil field inlet, the top end of the gas eliminator is communicated with a gas phase buffer pipe, and the bottom end of the gas eliminator is communicated with a second-stage separation pipe; the top of the secondary separation pipe is communicated with the gas phase buffer pipe, and the bottom of the secondary separation pipe is communicated with a liquid phase output pipe; the number of the second-stage separation pipe is at least one, and a liquid phase in the getter can flow to the second-stage separation pipe for gas-liquid separation; according to the gas-liquid two-phase separation device, the gas eliminator and the secondary separation pipe are arranged in series, so that the operation requirement of gas-liquid two-phase separation of well mouth mixed liquid can be effectively met, meanwhile, the structure of the gas-liquid two-phase separation device is simplified, and the use and maintenance cost of the device is reduced.

Description

Technical Field

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

[0002] Oilfield production is the basic data for oilfield development, so wellhead measurement of crude oil is an essential operation. In order to achieve accurate measurement of each phase, the separation of gas and liquid phases is essential so that the gas and liquid production 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, which also puts forward higher requirements on the gas-liquid separation efficiency of the equipment.

[0003] At present, most of the metering rooms of injection and production stations in oil fields use separation tanks for gas-liquid mixture gas-liquid two-phase separation metering. Since the separation tank is a pressure vessel, the installation and operation are complicated, the maintenance cost is high, and there are safety hazards. At present, a well station in an oil field generally has multiple oil wells. Due to the maturity of existing technologies, oil wells are mostly managed in a single line, that is, each oil well needs to be equipped with a separate gas-liquid separation device. The use of multiple pressure vessels makes oil field management complicated and also increases the use and maintenance costs, which is not conducive to the promotion and use of oil fields. There is an urgent need for an alternative to gas-liquid separation devices. Utility Model Content

[0004] The utility model aims to provide a gas-liquid two-phase separation device, which has a simple structure, low use and maintenance costs, and can meet the needs of gas-liquid two-phase separation of mixed liquid at the wellhead of an oil field.

[0005] In order to solve the above technical problems, the embodiment of the utility model provides a gas-liquid two-phase separation device as follows:

[0006] A gas-liquid two-phase separation device comprises a degasser, wherein an inlet pipe connected to an oil field inlet is provided on the side of the degasser, a gas phase buffer pipe is provided on the top of the degasser, and a secondary separation pipe is provided on the bottom of the degasser; the top of the secondary separation pipe is connected to the gas phase buffer pipe, and the bottom of the secondary separation pipe is connected to a liquid phase output pipe; at least one secondary separation pipe is provided, and the liquid phase in the degasser can flow to the secondary separation pipe for gas-liquid separation.

[0007] Furthermore, a float is movably provided inside the degasser, and the float can float on the surface of the liquid in the degasser and can close the passage between the top end of the degasser and the gas phase buffer tube when the liquid level rises.

[0008] Furthermore, an upper cover is provided at the top of the degasser, and the upper cover can close or open the internal space of the degasser, and the top of the upper cover is connected to the gas phase buffer tube through a gas connection tube.

[0009] Furthermore, the degasser is connected to the secondary separation tube via a liquid-connected tube, one end of the liquid-connected tube connected to the degasser is the liquid outlet, and one end of the liquid-connected tube connected to the secondary separation tube is the liquid inlet. A flow-breaking plate is provided in the secondary separation tube, and the liquid phase can be separated into gas and liquid through the flow-breaking plate.

[0010] Furthermore, the flow-breaking plate and the liquid inlet end are at the same horizontal position.

[0011] Furthermore, the horizontal position of the flow-breaking plate is lower than the horizontal position of the liquid inlet end.

[0012] Furthermore, the horizontal position of the liquid inlet end is higher than the horizontal position of the liquid outlet end.

[0013] Furthermore, the liquid inlet end and the liquid outlet end are at the same horizontal position.

[0014] Furthermore, there are a plurality of secondary separation tubes, and adjacent secondary separation tubes are connected via a liquid through tube, and the liquid through tube is at the same horizontal position as the liquid inlet end.

[0015] Furthermore, the gas phase buffer tube is connected to a gas phase output tube, and the gas phase output tube and the liquid phase output tube can be merged into the same pipeline.

[0016] Compared with the prior art, the utility model provides a gas-liquid two-phase separation device. Through the series arrangement of the degasser and the secondary separation tube, after the mixed liquid at the oil field wellhead enters the degasser, the mixed liquid is subjected to the first gas-liquid two-phase separation, the separated gas enters the gas phase buffer tube, and the separated liquid enters the secondary separation tube, and the liquid is subjected to the second gas-liquid two-phase separation in the secondary separation tube, thereby further improving the gas-liquid separation efficiency. The utility model provides a gas-liquid two-phase separation device with a simple structure and low use and maintenance costs, can effectively meet the demand for gas-liquid two-phase separation of mixed liquid at the oil field wellhead, and is conducive to market promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 This is a schematic diagram of the structure of a gas-liquid two-phase separation device in one embodiment of the utility model;

[0019] Figure 2 It is a schematic structural diagram of a gas-liquid two-phase separation device in another embodiment of the utility model.

[0020] Explanation of the reference numerals: 1. degasser; 11. upper cover; 12. inlet pipe; 13. float; 2. gas-connecting pipe; 21. vent pipe; 3. liquid-connecting pipe; 31. liquid outlet; 32. liquid inlet; 4. secondary separation pipe; 5. liquid output pipe; 6. gas buffer pipe; 7. gas output pipe; 8. flow-breaking plate; 9. liquid passage pipe. 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] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0023] like Figure 1-2 As shown, one embodiment of the utility model relates to a gas-liquid two-phase separation device, including a degasser 1, the upper side of the degasser 1 is provided with an inlet pipe 12 connected to the oil field wellhead, through which the mixed liquid produced from the oil field wellhead enters the degasser 1; after the mixed liquid enters the degasser 1, under the action of gravity, the liquid flows to the bottom along the internal space of the degasser 1, and the gas flows to the top of the degasser 1; the top of the degasser 1 is connected to a gas phase buffer pipe 6 through a gas-connected pipe 2, and the bottom of the degasser 1 is connected to a secondary separation pipe 4 through a liquid-connected pipe 3, and the bottom of the secondary separation pipe 4 is connected to a liquid phase output pipe 5; wherein, the secondary separation pipe 4 can be set as one, or can be set as multiple according to production needs, such as two, three, four, etc. When multiple secondary separation pipes 4 are set, the multiple separation pipes are set in series, and adjacent secondary separation pipes 4 are connected by a liquid pipe 9.

[0024] After the mixed liquid enters the degasser 1, due to the difference in density between the gas and the liquid, under the action of gravity, the gas flows to the top of the degasser 1, and is guided to the inside of the gas phase buffer tube 6 through the gas-connecting pipe 2, and the liquid flows to the bottom along the internal space of the degasser 1, and is guided to the secondary separation tube 4 through the liquid-connecting pipe 3.

[0025] Compared with the prior art method of using a pressure vessel separation tank to perform gas-liquid two-phase separation operations on the wellhead mixed liquid, the utility model uses a degasser 1 and a secondary separation pipe 4 in series to perform gas-liquid two-phase separation operations on the wellhead mixed liquid, wherein the degasser 1 belongs to the pressure pipeline and the separation tank belongs to the pressure vessel. The gas-liquid two-phase separation device provided by the utility model has a simple structure, is easy to install, and has low maintenance costs, which is more in line with the gas-liquid two-phase separation operation requirements of the oil field wellhead mixed liquid.

[0026] In an exemplary embodiment, a float 13 is provided inside the degasser 1, and the float 13 can float on the surface of the liquid in the degasser 1 and can close the channel between the top of the degasser 1 and the gas phase buffer tube 6 when the liquid level rises; for example, when the gas phase accounts for a large proportion and the liquid phase accounts for a small proportion in the mixed liquid from the wellhead, the mixed liquid enters the degasser 1, the liquid level is low, and the float 13 device floats on the liquid surface, and the channel between the degasser 1 and the gas phase buffer tube 6 is in a connected state, and the gas separated for the first time is discharged into the gas phase buffer tube 6, and the liquid enters the secondary separation tube 4 through the liquid-connected pipe 3 connected to the bottom end of the degasser 1; when the liquid phase accounts for a large proportion and the gas phase accounts for a small proportion, the discharge flow of the liquid through the liquid-connected pipe 3 is less than the liquid flow of the inlet pipe 12, the liquid level in the degasser 1 gradually rises, and the float 13 floats up with the rising liquid level until the channel between the top of the degasser 1 and the gas phase buffer tube 6 is sealed, thereby preventing the liquid from entering the gas phase buffer tube 6, resulting in a decrease in the gas-liquid two-phase separation efficiency.

[0027] In an exemplary embodiment, an upper cover 11 is further provided at the top of the degasser 1, and the upper cover 11 can close or open the internal space of the degasser 1, and the top of the upper cover 11 is connected to the gas phase buffer tube 6 through the gas connection tube 2. By opening the upper cover 11, the inside of the degasser 1 can be cleaned and repaired more conveniently, and maintenance is convenient.

[0028] In one embodiment, in order to further increase the effect of gas-liquid separation, a flow-breaking plate 8 is provided in the secondary separation tube 4, and the liquid entering the secondary separation tube 4 can be separated into gas and liquid through the flow-breaking plate 8; the flow-breaking plate 8 includes a hollow bottom plate, and a protrusion fixed on the bottom plate, and the protrusion faces the direction of the incoming liquid. Through the collision of the incoming liquid with the flow-breaking plate 8, the first separated liquid in the degasser 1 is subjected to secondary gas-liquid separation, thereby further improving the gas-liquid separation efficiency.

[0029] In one embodiment, the end of the liquid-connected pipe 3 connected to the bottom end of the degasser 1 is the liquid outlet end 31, and the end of the liquid-connected pipe 3 connected to the secondary separation pipe 4 is the liquid inlet end 32. The liquid outlet end 31 and the liquid inlet end 32 are horizontally arranged, and a flow-breaking plate 8 is arranged in the secondary separation pipe 4 corresponding to the liquid inlet end 32. The flow-breaking plate 8 and the liquid inlet end 32 are located at the same horizontal position, and the liquid entering the secondary separation pipe 4 can pass through the flow-breaking plate 8 and flow into the liquid phase output pipe 5.

[0030] In one embodiment, in order to improve the use effect of the flow-breaking plate 8, further improve the gas-liquid separation efficiency, and increase the impact force between the liquid entering the secondary separation tube 4 and the flow-breaking plate 8, the horizontal position of the liquid inlet end 32 is higher than the horizontal position of the liquid outlet end 31, and the horizontal position of the flow-breaking plate 8 in the secondary separation tube 4 is lower than the horizontal position of the liquid inlet end 32. The physical impact gas-liquid separation effect is increased by increasing the height difference between the liquid inlet end 32 and the flow-breaking plate 8.

[0031] In one embodiment, in order to increase the adaptability to the unstable ratio of the gas-liquid phase of the mixed liquid and further improve the gas-liquid separation efficiency, the secondary separation tube 4 is set to four, and the adjacent secondary separation tubes 4 are connected by a liquid through tube 9. The liquid through tube 9 and the liquid inlet end 32 are at the same horizontal position. Each secondary separation tube 4 is connected to the gas phase buffer tube 6 through the ventilation tube 21, and the gas in the secondary separation tube 4 is guided to the gas phase buffer tube 6, and the gas phase buffer tube 6 is guided to the gas phase output pipe 7.

[0032] When in use, the mixed liquid at the wellhead of the oil field first enters the degasser 1 to perform the first gas-liquid separation. The liquid enters the secondary separation tube 4 from the bottom of the degasser 1, and the gas enters the gas phase buffer tube 6 from the top of the degasser 1, thereby realizing the first gas-liquid two-phase separation of the mixed liquid; after the separated liquid enters the secondary separation tube 4, under the action of multiple secondary separation tubes 4, the liquid is broken and separated layer by layer by the flow-breaking plate 8, and the separated gas enters the gas phase buffer tube 6 through the vent pipe 21, and the separated liquid enters the liquid phase output pipe 5 through the liquid pipe 9, thereby realizing the second gas-liquid separation, making the gas-liquid two-phase separation more thorough and improving the gas-liquid separation efficiency. Finally, the gas after two separations passes through the gas phase output pipe 7, and the liquid converges to the outlet pipe (not shown in the figure) through the liquid phase output pipe 5 for output.

[0033] Compared with the prior art, the utility model provides a gas-liquid two-phase separation device. Through the series arrangement of the degasser and the secondary separation tube, after the mixed liquid at the oil field wellhead enters the degasser, the mixed liquid is subjected to the first gas-liquid two-phase separation, the separated gas enters the gas phase buffer tube, and the separated liquid enters the secondary separation tube, and the liquid is subjected to the second gas-liquid two-phase separation in the secondary separation tube, thereby further improving the gas-liquid separation efficiency. The utility model provides a gas-liquid two-phase separation device with a simple structure and low use and maintenance costs, can effectively meet the demand for gas-liquid two-phase separation of mixed liquid at the oil field wellhead, and is conducive to market promotion and application.

[0034] 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 gas-liquid two-phase separation device, characterized in that: The invention comprises a degasser (1), wherein an inlet pipe (12) connected to an oil field wellhead is provided on the side of the degasser (1), a gas phase buffer pipe (6) is provided at the top of the degasser (1), and a secondary separation pipe (4) is provided at the bottom of the degasser (1); the top of the secondary separation pipe (4) is connected to the gas phase buffer pipe (6), and the bottom of the secondary separation pipe (4) is connected to a liquid phase output pipe (5); at least one secondary separation pipe (4) is provided, and the liquid in the degasser (1) can flow to the secondary separation pipe (4) for gas-liquid separation.

2. A gas-liquid two-phase separation device according to claim 1, characterized in that: A floating ball (13) is movably provided inside the degasser (1). The floating ball (13) can float on the surface of the liquid in the degasser (1) and can close the passage between the top end of the degasser (1) and the gas phase buffer tube (6) when the liquid level rises.

3. A gas-liquid two-phase separation device according to claim 1 or 2, characterized in that: The top of the degasser (1) is provided with an upper cover (11), and the upper cover (11) is capable of closing or opening the internal space of the degasser (1). The top of the upper cover (11) is connected to the gas phase buffer tube (6) via a gas connection tube (2).

4. A gas-liquid two-phase separation device according to claim 1, characterized in that: The degasser (1) is connected to the secondary separation pipe (4) via a liquid-connected pipe (3); one end of the liquid-connected pipe (3) connected to the degasser (1) is a liquid outlet end (31); one end of the liquid-connected pipe (3) connected to the secondary separation pipe (4) is a liquid inlet end (32); a flow-breaking plate (8) is provided in the secondary separation pipe (4); and the liquid can be separated into gas and liquid through the flow-breaking plate (8).

5. A gas-liquid two-phase separation device according to claim 4, characterized in that: The flow-breaking plate (8) and the liquid inlet end (32) are at the same horizontal position.

6. A gas-liquid two-phase separation device according to claim 4, characterized in that: The horizontal position of the flow-breaking plate (8) is lower than the horizontal position of the liquid inlet end (32).

7. A gas-liquid two-phase separation device according to claim 4, characterized in that: The horizontal position of the liquid inlet end (32) is higher than the horizontal position of the liquid outlet end (31).

8. A gas-liquid two-phase separation device according to claim 4, characterized in that: The liquid inlet end (32) and the liquid outlet end (31) are at the same horizontal position.

9. A gas-liquid two-phase separation device according to claim 4, characterized in that: There are a plurality of secondary separation tubes (4), and adjacent secondary separation tubes (4) are connected via a liquid passage tube (9). The liquid passage tube (9) and the liquid inlet end (32) are at the same horizontal position.

10. A gas-liquid two-phase separation device according to any one of claims 1-2 and 4-9, characterized in that: The gas phase buffer pipe (6) is connected to a gas phase output pipe (7), and the gas phase output pipe (7) and the liquid phase output pipe (5) can converge into the same pipeline.

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