Composite gas-liquid separator

Abstract

The utility model relates to the technical field of gas-liquid separation equipment, in particular to a combined type gas-liquid separator which comprises a front-stage separator and a rear-stage separator, the front-stage separator comprises a separation cabin b, a separation cabin a is arranged in the separation cabin b, the top of the separation cabin a is connected with an inlet pipeline, and the inlet pipeline penetrates through the separation cabin b and extends to the outside. A spiral channel is arranged in the separation cabin a, a gas channel a is fixedly connected in the separation cabin a, a bottom opening of the gas channel a is arranged close to the bottom of the separation cabin a, the top of the gas channel a sequentially penetrates out of the separation cabin a and the separation cabin b and then is communicated with the upper end of the rear-stage separator, and the bottom opening of the separation cabin a enables liquid to flow into the separation cabin b. And the bottom of the separation cabin b is communicated with the bottom of the post-stage separator through a fluid pipeline. The composite oil-gas separation device is applied to a wellhead pipeline of an oil well in an oil field, is of a composite oil-gas separation structure, thoroughly separates oil gas by utilizing two structures with different principles, and is optimized in structure and small in size.

Description

Technical Field

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

[0002] The crude oil extracted from the oil well contains H 2 S is a toxic gas. Due to the long pipeline and many working links in the process, if there is a leak in the pipeline or any link in the process, it will endanger personal safety or even cause harm. Therefore, it is necessary to 2 S governs. But H 2 S exists in the crude oil in the oil well pipeline. The pressure in the pipeline is high. Before hydrogen sulfide detection and treatment, oil and gas separation is required, and then the separated gas is desulfurized to remove H2S from the gas. 2 S is removed, and the treated gas meets the emission standards before it is safely discharged or otherwise treated.

[0003] Oil and gas separation requires a gas-liquid separator. Since the commonly used gas-liquid separators are large in size, they cannot be used on oil well pipelines, and the existing gas-liquid separators have poor separation effect. Therefore, it is necessary to design a small oil-gas separator for oil well pipelines that can quickly and effectively separate the gas in crude oil. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a composite gas-liquid separator.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] A composite gas-liquid separator comprises a front-stage separator and a rear-stage separator, wherein the front-stage separator comprises a separation cabin b, a separation cabin a is arranged inside the separation cabin b, an inlet pipe is connected to the top of the separation cabin a, the inlet pipe passes through the separation cabin b and extends to the outside, a spiral channel is arranged inside the separation cabin a, a gas channel a is fixedly connected inside the separation cabin a, a bottom opening of the gas channel a is arranged near the bottom of the separation cabin a, the top of the gas channel a passes through the separation cabin a and the separation cabin b in sequence and then communicates with the upper end of the rear-stage separator, the bottom opening of the separation cabin a allows liquid to flow into the separation cabin b, and the bottom of the separation cabin b is communicated with the bottom of the rear-stage separator through a fluid pipeline.

[0007] The mixed gas enters the separation chamber a of the front separator from the inlet pipe. The structural characteristics of the spiral channel in the separation chamber a generate centrifugal force when the oil and gas with pressure pass through quickly. Due to the difference in density, the oil and gas are separated under the action of centrifugal force. After the oil and gas enter the separation chamber a, the space increases, and the separated gas enters the gas channel a and is sent to the rear separator. The crude oil flows out from the bottom of the separation chamber a and the separation chamber b to the fluid pipeline, and then enters the rear separator.

[0008] A fixed disc is installed at the bottom opening of the separation cabin a, a fluid channel is opened in the middle of the fixed disc, a protruding ring is arranged at the upper edge of the fluid channel, the protruding ring protrudes from the top surface of the fixed disc, and a plurality of anti-rotation baffles distributed in a circular array are arranged on the fixed disc, and the anti-rotation baffles are arranged close to the outer edge of the fixed disc.

[0009] An anti-rotation channel is formed between the protruding ring on the upper surface of the fixed disc and the anti-rotation baffle, and the crude oil separated by the separation cabin a flows out through the anti-rotation channel. In order to prevent the oil and gas that quickly flows out from the spiral channel outlet from rotating and causing the separated oil and gas to merge again, an anti-rotation baffle and an anti-rotation channel structure are set on the inner wall of the separation cabin. This structure has two functions: one is that the oil and gas that quickly enter cannot rotate under the obstruction of the anti-rotation baffle on the inner wall of the cabin; the other is that the crude oil quickly hits the anti-rotation baffle to produce reflection, so that the unseparated gas is released from the crude oil.

[0010] A cross-shaped plate is fixedly arranged in the fluid channel, and the bottom of the cross-shaped plate is connected to an overflow plate through an intermediate rod, and the overflow plate is a plate structure with a concave middle and a convex edge;

[0011] A gas channel b is arranged in the course of the gas channel a passing through the separation cabin b, and the gas channel b is communicated with the separation cabin b.

[0012] After the crude oil flows out of the anti-swirl channel, it passes through the overflow plate and enters the fluid pipeline. Since the overflow plate compartment space is large, the gas in the crude oil is released again under the action of the overflow plate structure, and the released gas enters the gas channel a through the gas channel b.

[0013] An overflow port is provided at the bottom of the separation cabin b, and the overflow port is correspondingly arranged at the lower part of the overflow plate, and the overflow port is communicated with the fluid pipeline.

[0014] The rear-stage separator comprises a separation cabin c, wherein a multi-stage flow-blocking ring is horizontally arranged on the inner wall of the separation cabin c, a multi-stage reflection disk is arranged in the middle of the separation cabin c, and the reflection disks are fixedly connected by connecting rods. The reflection disks are a truncated cone structure that is narrow at the top and wide at the bottom, and a through hole is opened in the middle of the reflection disks. The reflection disks and the flow-blocking rings are staggered in the vertical direction, and the bottom of the separation cabin c is a liquid outlet;

[0015] The fluid pipeline extends from the bottom of the separation cabin c into the interior of the separation cabin c and the outlet faces upward;

[0016] The top of the separation cabin c is connected with a gas channel c, and the gas channel c extends to the outside of the separation cabin c.

[0017] The crude oil separated by the front separator enters the rear separator through the fluid pipeline. The rear separator uses the volume difference to separate oil and gas. When the reflector reflects the crude oil, the inner diameter and capacity of the top of the separation cabin c are much larger than the crude oil flow rate per unit time. The increase in space causes the pressure in the cabin to drop, and the remaining gas in the crude oil will be completely separated. The separated gas rises and enters the gas channel c through the choke valve. The crude oil flows out from the liquid outlet through the overflow pipe at the bottom of the separation cabin c under the action of gravity.

[0018] The reflection disk at the top is connected to a choke disk through a connecting rod, and the top of the choke disk is connected to a choke valve, which is fixedly arranged on the top of the separation cabin c and connected to the gas channel c.

[0019] The outlet of the fluid pipeline is arranged as a necked pipe, and an umbrella-shaped nozzle is arranged at the outlet.

[0020] The crude oil separated by the front separator enters the rear separator through the fluid pipeline and is quickly sprayed out by the umbrella nozzle through the diameter reduction pipe. The function of the diameter reduction pipe structure is to reduce the diameter of the fluid pipeline to increase the flow rate, and the function of the umbrella nozzle structure is to spray the fluid outward through the small holes distributed on the nozzle. The purpose of using the umbrella nozzle to spray is to allow the fluid to be evenly sprayed onto the multi-layer reflective disk, and the remaining gas in the crude oil is released through the blocking and reflection of the reflective disk.

[0021] A foam catcher is provided at the connection between the gas channel a and the separation cabin c. The foam catcher is used to prevent the splashing oil in the separation cabin c from entering the gas pipeline b.

[0022] The bottom end of the gas channel a is provided with a gas collecting port, which is umbrella-shaped, and the separated gas enters the gas channel a through the gas collecting port.

[0023] The spiral channel is arranged outside the gas channel a.

[0024] A flow-blocking net is arranged inside the gas channel a, and the flow-blocking net serves to block the oil in the gas. Specifically, there are bubbles containing oil in the gas entering the gas channel a from the gas collecting port. The bubbles are broken when passing through the flow-blocking net, and the gas goes upward through the flow-blocking net. Under the action of gravity, the oil flows into the separation cabin a along the pipe wall.

[0025] The beneficial effects achieved by the utility model are:

[0026] The utility model is applied to the wellhead pipeline of an oil field oil well and is a composite oil and gas separation structure, which can quickly and efficiently separate the gas in the crude oil, thereby facilitating the subsequent treatment of the hydrogen sulfide gas.

[0027] The utility model utilizes two structures with different principles, namely, a front-stage separator and a rear-stage separator, to separate oil and gas more thoroughly, optimizes the overall structure, and has a small volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 It is a schematic diagram of the structure of the utility model;

[0030] Figure 2 This is a schematic diagram of the structure of the fixed disc of the utility model (top view);

[0031] Figure 3 This is a schematic diagram of the structure of the fixed disc of the utility model (stereoscopic perspective);

[0032] Figure 4 It is a schematic diagram of the structure of the reflector plate and the spoiler plate of the utility model;

[0033] Figure 5 It is a schematic diagram of the oil and gas separation state when the utility model is applied to the wellhead pipeline of an oil well.

[0034] In the figure: 1, inlet pipe; 2, gas channel a; 3, separation cabin b; 4, choke net; 5, separation cabin a; 6, anti-rotation baffle; 7, overflow disc; 8, overflow port; 9, spiral channel; 10, gas channel b; 11, foam catcher net; 12, choke valve; 13, gas channel c; 14, choke disc; 15, connecting rod; 16, separation cabin c; 17, reflective disc; 18, choke ring; 19, umbrella-shaped nozzle; 20, liquid outlet; 21, fluid pipeline; 22, protruding ring; 23, fixed disc; 24, cross-shaped plate; 25, fluid channel; 26, through hole. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0036] Example:

[0037] like Figure 1-Figure 4As shown, a composite gas-liquid separator includes a front-stage separator and a rear-stage separator. The front-stage separator includes a separation cabin b3, a separation cabin a5 is arranged in the separation cabin b3, the top of the separation cabin a5 is connected to the inlet pipe 1, the inlet pipe 1 passes through the separation cabin b3 and extends to the outside, a spiral channel 9 is arranged inside the separation cabin a5, a gas channel a2 is fixedly connected to the separation cabin a5, the bottom opening of the gas channel a2 is arranged close to the bottom of the separation cabin a5, the top of the gas channel a2 passes through the separation cabin a5 and the separation cabin b3 in sequence and then communicates with the upper end of the rear-stage separator, the bottom opening of the separation cabin a5 allows liquid to flow into the separation cabin b3, and the bottom of the separation cabin b3 is communicated with the bottom of the rear-stage separator through the fluid pipeline 21.

[0038] Crude oil enters the separation chamber a5 of the front separator from the inlet pipe 1. The structural features of the spiral channel 9 in the separation chamber a5 generate centrifugal force when the pressurized crude oil passes through quickly. Due to the difference in density, oil and gas are separated under the action of centrifugal force. After the oil and gas enter the separation chamber a5, the space increases, and the separated gas enters the gas channel a2 and is sent to the rear separator. The crude oil flows out from the bottom of the separation chamber a5 and the separation chamber b3 to the fluid pipeline 21, and then enters the rear separator.

[0039] A fixed disc 23 is installed at the bottom opening of the separation cabin a5, a fluid channel 25 is opened in the middle of the fixed disc 23, a protruding ring 22 is arranged at the upper edge of the fluid channel 25, and the protruding ring 22 protrudes from the top surface of the fixed disc 23. A plurality of anti-rotation baffles 6 distributed in a circular array are arranged on the fixed disc 23, and the anti-rotation baffles 6 are arranged close to the outer edge of the fixed disc 23.

[0040] An anti-rotation channel is formed between the protruding ring 22 on the upper surface of the fixed disc 23 and the anti-rotation baffle 6, and the crude oil separated by the separation cabin a5 flows out through the anti-rotation channel. In order to prevent the oil that quickly flows out from the outlet of the spiral channel 9 from continuing to rotate and to prevent the separated oil and gas from merging again, an anti-rotation baffle 6 and an anti-rotation channel structure are set on the inner wall of the separation cabin a5. This structure has two functions: one is that the crude oil that quickly enters cannot continue to rotate under the obstruction of the anti-rotation baffle 6 on the inner wall of the cabin; the other is that the crude oil quickly hits the anti-rotation baffle 6 to produce reflection, so that the unseparated gas is released from the crude oil.

[0041] A cross-shaped plate 24 is fixedly disposed in the fluid channel 25 , and the bottom of the cross-shaped plate 24 is connected to an overflow plate 7 via an intermediate rod. The overflow plate 7 is a plate structure with a concave middle and convex edges.

[0042] A gas channel b10 is arranged in the course of the gas channel a2 passing through the separation cabin b3, and the gas channel b10 is communicated with the separation cabin b3.

[0043] After the crude oil flows out of the anti-swirl channel, it passes through the overflow plate 7 and enters the fluid pipeline 21. Since the overflow plate 7 has a large cabin space, the gas in the crude oil is released again under the action of the overflow plate 7 structure, and the released gas enters the gas channel a2 through the gas channel b10.

[0044] The bottom of the separation cabin b3 is provided with an overflow port 8, which is correspondingly arranged at the lower part of the overflow tray 7, and is connected to the fluid pipeline 21. The liquid flowing out of the overflow tray 7 flows out of the overflow port 8 to the fluid pipeline 21.

[0045] The rear-stage separator includes a separation cabin c16, and a multi-stage baffle ring 18 is horizontally arranged on the inner wall of the separation cabin c16. A multi-stage reflective disk 17 is arranged in the middle of the separation cabin c16. The reflective disks 17 are fixedly connected to each other by a connecting rod 15. The reflective disk 17 is a truncated cone structure that is narrow at the top and wide at the bottom. A through hole 26 is opened in the middle of the reflective disk 17. The reflective disk 17 and the baffle ring 18 are staggered in the vertical direction. The bottom of the separation cabin c16 is a liquid outlet 20, and the top of the separation cabin c16 is a gas channel c13.

[0046] The fluid conduit 21 extends from the bottom of the separation cabin c16 into the interior of the separation cabin c16 and the outlet faces upward. The outlet of the fluid conduit 21 is configured as a constricted pipe, and an umbrella-shaped nozzle 19 is provided at the outlet.

[0047] The crude oil separated by the front separator enters the rear separator through the fluid pipeline 21, and is quickly sprayed out by the umbrella nozzle 19 through the diameter reduction pipe. The function of the diameter reduction pipe structure is to reduce the diameter of the fluid pipeline 21 to increase the flow rate, and the function of the umbrella nozzle 19 structure is to spray the fluid outward through the small holes distributed on the nozzle (similar to the principle of a shower). The purpose of using the umbrella nozzle 19 to spray the fluid evenly onto the multi-layer reflective disk 17, and release the remaining gas in the crude oil through the blocking and reflection of the reflective disk 17.

[0048] In addition, the crude oil separated by the front separator enters the rear separator through the fluid pipeline 21. The rear separator uses the volume difference to separate oil and gas. When the reflective disk 17 reflects the crude oil, the inner diameter and capacity of the top of the separation cabin c16 are much larger than the crude oil flow rate per unit time. The increase in space causes the cabin pressure to drop, and the remaining gas in the crude oil will be completely separated. The separated gas rises and passes through the choke valve 12 into the gas channel c13. The crude oil flows out from the liquid outlet 20 through the overflow pipe at the bottom of the separation cabin c16 under the action of gravity.

[0049] The topmost reflective disk 17 is connected to the choke disk 14 through the connecting rod 15, and the top of the choke disk 14 is connected to the choke valve 12, which is fixedly arranged on the top of the separation cabin c16, and is connected to the gas channel c13, and the gas channel c13 is arranged on the top outer side of the separation cabin c16. A floating valve core is arranged in the choke valve 12, and if the crude oil outlet pipeline is blocked and the crude oil in the separation cabin c16 rises, when it rises to a certain height, the floating valve core of the choke valve 12 is floated by the crude oil and the valve port is closed.

[0050] A foam catcher 11 is provided at the connection between the gas passage a2 and the separation cabin c16. The foam catcher 11 is used to prevent the oil splashing in the separation cabin c16 from entering the gas passage a2.

[0051] The bottom end of the gas channel a2 is provided with a gas collecting port, which is umbrella-shaped, and the separated gas enters the gas channel a2 through the gas collecting port. The spiral channel 9 is arranged outside the gas channel a2. The spiral channel 9 is a spiral plate-like structure.

[0052] A flow-blocking net 4 is arranged inside the gas channel a2, and the flow-blocking net 4 functions to block the oil in the gas. Specifically, there are bubbles containing oil in the gas entering the gas channel a2 from the gas collecting port. The bubbles are broken when passing through the flow-blocking net 4, and the gas goes upward through the flow-blocking net 4. Under the action of gravity, the oil flows into the separation cabin a5 along the pipe wall.

[0053] like Figure 5 As shown, when the utility model is applied to the wellhead pipeline of an oil well, the working principle for oil and gas separation is as follows: the pressurized crude oil enters from the inlet pipeline 1 of the front separator, and centrifugal force is generated when it passes through the spiral channel 9 quickly. Due to the different specific gravities, the oil and gas are separated under the action of the centrifugal force, and the separated oil and gas enter the separation cabin a5 from the outlet of the spiral channel 9, and the gas enters the gas channel a2 from the gas collection port in the separation cabin a5. The crude oil that quickly rotates into the separation cabin a5 collides with the anti-rotation baffle 6, and the remaining gas in the crude oil is released again. The released gas enters the gas channel a2 from the gas collection port, and the crude oil flows out through the fluid channel 25. Since the space of the separation cabin b3 is large, the crude oil flowing out of the fluid channel 25 overflows through the overflow plate 7, and the remaining gas is released again and enters the gas channel b10, and the crude oil enters the fluid pipeline 21 through the overflow port 8.

[0054] The crude oil separated by the front separator enters the rear separator through the fluid pipeline 21. When passing through the reducing pipe, the flow rate of the crude oil is accelerated due to the reduction of the pipe diameter. The umbrella-shaped nozzle 19 at the end of the reducing pipe is provided with a plurality of small holes with smaller apertures. The crude oil is quickly ejected upward through the small holes and hits the multi-layer reflective disk 17. Since the separation cabin c16 has a large volume, the pressure of the crude oil after ejection decreases due to the increase in space, and the remaining gas will be released from the crude oil. In addition, if there is still gas after the ejected crude oil hits the reflective disk 17, it will be released. The reflected crude oil will scatter and splash onto the cabin wall, and will flow slowly downward along the blocking ring 18 under the action of gravity and flow out from the liquid outlet 20. The gas continuously released from the crude oil gradually flows upward through the outlet of the blocking valve 12 into the gas channel c13, and then flows out.

Claims

1. A composite gas-liquid separator, characterized in that: The invention comprises a front-stage separator and a rear-stage separator. The front-stage separator comprises a separation capsule b (3). A separation capsule a (5) is arranged in the separation capsule b (3). The top of the separation capsule a (5) is connected to an inlet pipe (1). The inlet pipe (1) passes through the separation capsule b (3) and extends to the outside. A spiral channel (9) is arranged inside the separation capsule a (5). A gas channel a (2) is fixedly connected inside the separation capsule a (5). The bottom opening of the gas channel a (2) is arranged close to the bottom of the separation capsule a (5). The top of the gas channel a (2) passes through the separation capsule a (5) and the separation capsule b (3) in sequence and then communicates with the upper end of the rear-stage separator. The bottom opening of the separation capsule a (5) allows liquid to flow into the separation capsule b (3). The bottom of the separation capsule b (3) is communicated with the bottom of the rear-stage separator through a fluid pipe (21).

2. The composite gas-liquid separator according to claim 1, characterized in that: A fixed disc (23) is installed at the bottom opening of the separation cabin a (5), a fluid channel (25) is opened in the middle of the fixed disc (23), a protruding ring (22) is arranged at the upper edge of the fluid channel (25), the protruding ring (22) protrudes from the top surface of the fixed disc (23), and a plurality of anti-rotation baffles (6) distributed in a ring array are arranged on the fixed disc (23), and the anti-rotation baffles (6) are arranged close to the outer edge of the fixed disc (23).

3. The composite gas-liquid separator according to claim 2, characterized in that: A cross-shaped plate (24) is fixedly arranged in the fluid channel (25), and the bottom of the cross-shaped plate (24) is connected to an overflow plate (7) via an intermediate rod. The overflow plate (7) is a plate structure with a concave middle and convex edges.

4. The composite gas-liquid separator according to claim 3, characterized in that: The bottom of the separation cabin b (3) is provided with an overflow port (8), the overflow port (8) is correspondingly arranged at the lower part of the overflow plate (7), and the overflow port (8) is connected to the fluid pipeline (21); A gas channel b (10) is arranged in the course of the gas channel a (2) passing through the separation cabin b (3), and the gas channel b (10) is in communication with the separation cabin b (3).

5. The composite gas-liquid separator according to claim 1, characterized in that: The rear-stage separator comprises a separation cabin C (16), the inner wall of the separation cabin C (16) is horizontally provided with a multi-stage flow-blocking ring (18), a middle portion of the separation cabin C (16) is provided with a multi-stage reflection disk (17), two reflection disks (17) are fixedly connected by a connecting rod (15), the reflection disk (17) is a truncated cone structure narrow at the top and wide at the bottom, a through hole (26) is provided in the middle portion of the reflection disk (17), the reflection disk (17) and the flow-blocking ring (18) are staggered in the vertical direction, and the bottom of the separation cabin C (16) is a liquid outlet (20); The fluid conduit (21) extends from the bottom of the separation cabin c (16) into the interior of the separation cabin c (16) and has an outlet facing upward; The top of the separation cabin c (16) is connected to a gas channel c (13), and the gas channel c (13) extends outside the separation cabin c (16).

6. The composite gas-liquid separator according to claim 5, characterized in that: The reflection disk (17) at the top is connected to a baffle disk (14) via a connecting rod (15), the top of the baffle disk (14) is connected to a baffle valve (12), the baffle valve (12) is fixedly arranged on the top of the separation cabin c (16), and the baffle valve (12) is connected to the gas channel c (13).

7. The composite gas-liquid separator according to claim 5, characterized in that: The outlet of the fluid pipeline (21) is configured as a necked tube, and an umbrella-shaped spray nozzle (19) is provided at the outlet.

8. The composite gas-liquid separator according to claim 5, characterized in that: A foam catching net (11) is provided at the connection between the gas channel a (2) and the separation cabin c (16).

9. The composite gas-liquid separator according to claim 1, characterized in that: The bottom end of the gas channel a (2) is provided with a gas collecting port, which is umbrella-shaped; The spiral channel (9) is arranged on the outside of the gas channel a (2).

10. The composite gas-liquid separator according to claim 1, characterized in that: A flow-blocking net (4) is arranged inside the gas channel a (2).

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