Gas-liquid-sand separation defoaming metering device

Abstract

The invention discloses a gas-liquid-sand separation, defoaming and metering device. The device comprises a vertical separator, a separation assembly, a defoaming assembly, a gas phase flowmeter and a liquid phase flowmeter, wherein the separation assembly and the defoaming assembly are arranged in the vertical separator; wherein the upper part and the lower part of the vertical separator are respectively connected with the gas phase flowmeter and the liquid phase flowmeter; according to the integrated gas-liquid-sand separation, defoaming and metering device for coal bed gas exploitation, the desanding function, the gas-liquid separation function, the defoaming function and the metering function are integrated, the occupied area is reduced, the treatment process of gas-liquid-sand mixed fluid is simplified, then the production efficiency is improved, and the production cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of coalbed methane mining, collection and transportation, and in particular to a gas-liquid-sand separation and defoaming metering device. Background Art

[0002] During the deep coalbed methane mining process, the wellhead gas contains a large amount of liquid, foam and sand. The mining and transportation process requires the gas and liquid to be separated, measured and the foam to be eliminated. In the existing technology, the gas, liquid and sand separation and measurement are usually achieved through a separate desander, flow meter and large separator, and a large amount of foam is treated by adding a defoaming agent.

[0003] Regarding sand removal, the desanders in the prior art include various types such as filtration type and cyclone type, which usually require manual operation on a regular basis and have high work intensity; regarding gas and liquid metering, deep coalbed methane extraction mostly adopts cluster wells, and the mixed fluid metering of a single well usually adopts a two-phase flow meter or a rotation metering method, which is costly and has low metering accuracy; regarding foam treatment, a large amount of water will be produced during the deep coalbed methane extraction process. When the gas output drops to a certain level, the gas cannot carry the water out. At this time, liquid accumulation at the bottom of the well will cause the natural gas to be unable to flow out of the wellhead. At this time, it is usually chosen to add a foaming agent to convert the liquid into foam, so that the airflow can carry the foam out. When the foam flows out of the wellhead, the prior art usually chooses to use a defoaming agent to eliminate the foam, but the cost of defoaming with a defoaming agent is high and the pollution is greater.

[0004] Therefore, providing an integrated gas-liquid-sand separation and defoaming metering device for coalbed methane mining with controllable cost, good gas separation effect and high gas-liquid metering accuracy has become a technical problem that urgently needs to be solved. Summary of the invention

[0005] The object of the present invention is to provide a gas-liquid-sand separation and defoaming metering device to solve the above-mentioned technical problems.

[0006] To achieve the above object, the present invention provides a gas-liquid-sand separation and defoaming metering device, the device comprising: a vertical separator, a separation component and a defoaming component arranged inside the vertical separator, a gas phase flow meter, and a liquid phase flow meter;

[0007] The upper and lower parts of the vertical separator are respectively connected to the gas phase flow meter and the liquid phase flow meter; the defoaming component is arranged above the separation component.

[0008] Optionally, a fluid inlet for gas-liquid-sand is provided in the middle of the vertical separator.

[0009] Optionally, the separation assembly includes: a sealing plate, a separation cylinder and an exhaust cylinder;

[0010] Among them, the baffle plate is connected to the inner wall of the vertical separator; the separation cylinder is located below the baffle plate and one end close to the baffle plate forms an input end; one end of the exhaust cylinder passes through the baffle plate and extends upward, and the other end extends downward along the input end of the separation cylinder to form a fixed section; the fluid inlet is lower than the input end of the separation cylinder.

[0011] Optionally, the separation component further comprises: a spiral swirler is arranged on the outer wall of the fixed section; wherein the spiral swirler is an inclined blade or groove spirally arranged along the fixed section, and the outer edge of the spiral swirler abuts against the inner wall of the separation cylinder.

[0012] Optionally, the defoaming component includes: a base body, and a bubble breaking cone disposed above the base body;

[0013] Wherein, a plurality of accelerating holes and a plurality of collecting holes corresponding to the plurality of accelerating holes are arranged inside the substrate; the output end of the collecting hole abuts against the bubble breaking cone, and the accelerating hole is arranged below the collecting hole.

[0014] Optionally, the acceleration hole is in the shape of a hollow truncated cone, and the end with a larger circular area is flush with the bottom surface of the substrate, and the end with a smaller circular area is connected to the input end of the collecting hole.

[0015] Optionally, the device further comprises: a gas phase outlet and an exhaust pipe;

[0016] The input end of the gas phase outlet is connected to the upper part of the vertical separator, the output end of the gas phase outlet is connected to the exhaust pipe, and the gas phase flow meter is arranged on the exhaust pipe.

[0017] Optionally, the device further comprises: a liquid phase outlet, a liquid and sand discharge pipeline, and a liquid and sand discharge valve;

[0018] Among them, the input end of the liquid phase outlet is connected to the lower part of the vertical separator, the output end of the liquid phase outlet is connected to the drainage and sand discharge pipeline, and the liquid phase flowmeter is arranged on the drainage and sand discharge pipeline; a drainage and sand discharge valve is arranged at the end of the drainage and sand discharge pipeline.

[0019] Optionally, the device further comprises: a liquid level meter; the liquid level meter is installed on the outer surface of the vertical separator.

[0020] Optionally, the device further comprises: a controller, which is communicatively connected with the liquid level meter and the liquid and sand discharge valve respectively.

[0021] Technical effects and advantages of the present invention:

[0022] (1) The present invention provides an integrated gas-liquid-sand separation and defoaming metering device for coalbed methane mining, which integrates the functions of sand removal, gas-liquid separation, defoaming and metering into one, thereby reducing the footprint and simplifying the processing flow of the gas-liquid-sand mixed fluid, thereby improving production efficiency and reducing production costs;

[0023] (2) The gas-liquid-sand mixed fluid is further separated by the separation component, thereby improving the gas separation effect;

[0024] (3) Defoaming is performed by using a defoaming component instead of a defoaming agent, which reduces the defoaming cost and causes less damage to the environment;

[0025] (4) After the gas-liquid and sand-containing liquid are separated, they are measured separately by gas flowmeter and liquid flowmeter, which improves the measurement accuracy and facilitates recording and statistics as well as meeting other process requirements;

[0026] (5) The controller can be used to collect liquid level height and automatically drain liquid and sand, thereby improving work efficiency and reducing labor intensity.

[0027] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the gas-liquid-sand separation and defoaming metering device of the present invention;

[0029] Figure 2 It is a front cross-sectional view of a separation component in the gas-liquid-sand separation and defoaming metering device of the present invention;

[0030] Figure 3 It is a top view of the separation component in the gas-liquid-sand separation and defoaming metering device of the present invention (the sealing plate is omitted);

[0031] Figure 4 It is a front cross-sectional view of a defoaming component in a gas-liquid-sand separation defoaming metering device of the present invention;

[0032] Figure 5 It is a top view of the defoaming component in the gas-liquid-sand separation defoaming metering device of the present invention;

[0033] Figure numerals: 1. Vertical separator; 11. Gas phase outlet; 12. Liquid phase outlet; 13. Fluid inlet; 14. Liquid level meter; 2. Separation component; 21. Sealing plate; 22. Separation cylinder; 23. Exhaust cylinder; 24. Fixed section; 25. Spiral swirler; 3. Defoaming component; 31. Base; 32. Acceleration hole; 33. Bubble breaking cone; 34. Collecting hole; 4. Exhaust pipe; 41. Gas phase flowmeter; 5. Liquid and sand discharge pipe; 51. Liquid phase flowmeter; 52. Liquid and sand discharge valve; 6. Controller. DETAILED DESCRIPTION

[0034] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings provided by the present invention, and the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0035] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0036] During deep coalbed methane mining, it is necessary to measure the gas and water produced by a single well. After the mining of a single well is completed, the mined fluid needs to be transported to the downstream gas gathering station to separate the gas and water. The efficiency of the separator for separating solid and liquid particles must reach 97% at the same time, and the particle size of the separated solid must be ≥20μm and the particle size of the separated liquid must be ≥20μm.

[0037] ≥50μm; the sand production time in the production stage is about 100 days, the sand volume is <5L / d, and the particle size is mainly distributed in 40-70 mesh, which is the fracturing sand return; according to the gas production process requirements, the foam-assisted gas production process is adopted in the self-spraying stage, so a foaming agent injection device is required. In order to reduce the impact of foam carried by the produced gas and water on ground facilities and pipeline gathering and transportation, corresponding defoaming facilities are set up.

[0038] The present embodiment provides an integrated gas-liquid-sand separation and defoaming metering device for coalbed methane extraction, which can solve the above gas extraction process requirements at a low cost, and the solid-liquid separation efficiency can reach 97%, the separated solid particle size is ≥20μm, the separated liquid particle size is ≥50μm, and the metering accuracy reaches 5% for the gas phase and more than 10% for the liquid phase.

[0039] The following combination Figure 1 The gas-liquid-sand separation and defoaming metering device is explained in detail.

[0040] A gas-liquid-sand separation and defoaming metering device comprises: a vertical separator 1, a separation component 2 and a defoaming component 3 arranged inside the vertical separator 1, a gas phase flowmeter 41, and a liquid phase flowmeter 51.

[0041] The gas phase and liquid phase output ends of the vertical separator 1 are respectively provided with a gas phase flowmeter 41 and a liquid phase flowmeter 51 , that is, the sand removal, gas-liquid separation, defoaming and metering functions are integrated and controlled by the controller 6 .

[0042] Among them, the vertical separator 1 has a relative upper part and a lower part, the lower part is one end where sand and liquid flow under the action of gravity; the upper part of the vertical separator 1 is connected to a gas phase outlet 11, the lower part of the vertical separator 1 is connected to a liquid phase outlet 12, and the middle part of the vertical separator 1 is connected to a fluid inlet 13, which is used to pass a gas-liquid-sand mixed fluid.

[0043] Wherein, a plurality of liquid level gauges 14 are arranged on the vertical separator 1 for real-time monitoring of the liquid level in the vertical separator 1 .

[0044] A separation component 2 is provided in the vertical separator 1 and near the fluid inlet 13 , and the separation component 2 is used to further separate the gas in the gas-liquid-sand mixed fluid passing through the separation component 2 .

[0045] The separation assembly 2 specifically includes: a baffle plate 21, a separation cylinder 22 and an exhaust cylinder 23. The baffle plate 21 is sealed and connected to the inner wall of the vertical separator 1, so that the mixed fluid is blocked by the baffle plate 21 and enters the separation cylinder 22 for gas separation; the separation cylinder 22 is arranged below the baffle plate 21. For the convenience of description, the end of the separation cylinder 22 close to the baffle plate 21 is defined as the input end. Under the action of pressure, the mixed fluid blocked by the baffle plate 21 enters the separation cylinder 22 at the above input end for gas-liquid separation.

[0046] One end of the exhaust cylinder 23 passes through the baffle plate 21 and extends upward, and the other end extends downward along the input end of the separation cylinder 22 to form a fixed section 24; the exhaust cylinder 23 can pass the gas and foam separated in the separation cylinder 22 to the upper defoaming component 3, and the outer wall of the fixed section 24 is fixedly provided with a spiral vortex 25, such as Figure 2 shown.

[0047] The spiral swirler 25 is an inclined blade spirally arranged along the fixed section 24, and the outer edge of the spiral swirler 25 abuts against the inner wall of the separation cylinder 22. The mixed fluid entering from the input end of the separation cylinder 22 forms a cyclone (vortex) at the spiral swirler 25 under the action of pressure, self-gravity and the spiral swirler 25. The dense sand and liquid are thrown to the inner wall of the separation cylinder 22 by the cyclone, thereby separating the gas in the sand-containing liquid. The separated gas and foam continue to flow upward from the exhaust cylinder 23, as shown in FIG. Figure 3 shown.

[0048] It should be noted that the fluid inlet 13 of the vertical separator 1 should be lower than the input end of the separation cylinder 22 .

[0049] Among them, the defoaming component 3 includes: a base 31 and a bubble breaking cone 33 arranged above the base 31. A plurality of acceleration holes 32 are opened in a ring shape on the base 31. The interior of the plurality of acceleration holes 32 is tapered from bottom to top. The function of the tapered setting is that: under the action of pressure, the foam is accelerated again when passing through the acceleration hole 32, thereby colliding with the bubble breaking cone 33.

[0050] As an optional embodiment, the ends of the above-mentioned multiple acceleration holes 32 are all connected to a collecting hole 34, and the output end of the collecting hole 34 is against the lower part of the cone of the bubble breaking cone 33; the collecting hole 34 can align the foam from the acceleration hole 32 with the lower part of the cone of the bubble breaking cone 33 to accurately defoam, thereby improving the defoaming efficiency. Figure 4 and 5 shown.

[0051] Among them, the gas phase outlet 11 of the vertical separator 1 is connected to the exhaust pipe 4, and the exhaust pipe 4 is provided with a gas phase flowmeter 41; the liquid phase outlet 12 is connected to the drainage and sand discharge pipe 5, and the drainage and sand discharge pipe 5 is provided with a liquid phase flowmeter 51, and the end of the drainage and sand discharge pipe 5 is provided with a drainage and sand discharge valve 52. It can be understood that the gas phase flowmeter 41 and the liquid phase flowmeter 51 are used to measure the gas and liquid flow. In this embodiment, the measurement is performed after the gas and liquid are separated, and the measurement result is more accurate compared with the prior art.

[0052] It should also be noted that the present embodiment omits some descriptions about valves, sensors, seals, connectors and reinforcements; those skilled in the art can understand that the controller 6 can also be connected to communicate with some valve bodies and sensors to facilitate control by personnel.

[0053] In order to better understand the present scheme, the operation of the gas-liquid-sand separation and defoaming metering device is generally described below.

[0054] A gas-liquid-sand mixed fluid is introduced into the fluid inlet 13. Due to the effect of their own gravity, most of the liquid and sand flow to the lower part of the vertical separator 1; the gas carries a small amount of liquid (foam) and powder to the upper part of the vertical separator 1, but due to the deflection effect of the sealing plate 21 in the above-mentioned separation component 2, the foam and powder enter the separation component 2 from the input end of the separation cylinder 22 for further separation.

[0055] The separated large mass liquid and sand flow from the lower part of the separation component 2 to the lower part of the vertical separator 1, and the gas carries a small amount of liquid (foam) through the exhaust cylinder 23 and passes into the defoaming component 3. After the foam is defoamed by the defoaming component 3, the gas flows upward to the gas phase outlet 11. The gas flowing out of the gas phase outlet 11 passes through the exhaust pipe 4 and is measured by the gas phase flowmeter 41. The liquid and sand gather at the lower part of the vertical separator 1. When the liquid level meter 14 detects that the liquid and sand accumulate to a certain height in the vertical separator 1, it sends a feedback signal to the controller 6, and the controller 6 controls the liquid and sand discharge valve 52 to open. At this time, the sand-containing liquid flows out from the liquid and sand discharge pipe 5, is measured by the liquid phase flowmeter 51, and is finally discharged through the liquid and sand discharge valve 52.

[0056] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas-liquid-sand separation and defoaming metering device, characterized in that: The device comprises: a vertical separator (1), a separation component (2) and a defoaming component (3) arranged inside the vertical separator (1), a gas phase flow meter (41), and a liquid phase flow meter (51); The upper part and the lower part of the vertical separator (1) are respectively connected to a gas phase flow meter (41) and a liquid phase flow meter (51); and the defoaming component (3) is arranged above the separation component (2).

2. The device according to claim 1, characterized in that A fluid inlet (13) for gas, liquid and sand is arranged in the middle of the vertical separator (1).

3. The device according to claim 2, characterized in that The separation assembly (2) comprises: a sealing plate (21), a separation cylinder (22) and an exhaust cylinder (23); The baffle plate (21) is connected to the inner wall of the vertical separator (1); the separation cylinder (22) is located below the baffle plate (21) and one end close to the baffle plate (21) forms an input end; one end of the exhaust cylinder (23) passes through the baffle plate (21) and extends upward, and the other end extends downward along the input end of the separation cylinder (22) to form a fixed section (24); the fluid inlet (13) is lower than the input end of the separation cylinder (22).

4. The device according to claim 3, characterized in that The separation component (2) further comprises: a spiral swirler (25) arranged on the outer wall of the fixed section (24); wherein the spiral swirler (25) is an inclined blade or groove spirally arranged along the fixed section (24), and the outer edge of the spiral swirler (25) abuts against the inner wall of the separation cylinder (22).

5. The device according to claim 1, characterized in that The defoaming component (3) comprises: a base body (31), and a bubble breaking cone (33) arranged above the base body (31); A plurality of accelerating holes (32) and a plurality of collecting holes (34) corresponding to the plurality of accelerating holes (32) are arranged inside the base body (31); the output end of the collecting hole (34) abuts against the bubble breaking cone (33), and the accelerating hole (32) is arranged below the collecting hole (34).

6. The device according to claim 5, characterized in that The acceleration hole (32) is in the shape of a truncated cone with a hollow interior, and the end with a larger circular area is flush with the bottom surface of the base (31), and the end with a smaller circular area is connected to the input end of the collecting hole (34).

7. The device according to claim 1, characterized in that The device further comprises: a gas phase outlet (11) and an exhaust pipe (4); The input end of the gas phase outlet (11) is connected to the upper part of the vertical separator (1), the output end of the gas phase outlet (11) is connected to the exhaust pipe (4), and the gas phase flow meter (41) is arranged on the exhaust pipe (4).

8. The device according to claim 1, characterized in that The device further comprises: a liquid phase outlet (12), a liquid and sand discharge pipeline (5), and a liquid and sand discharge valve (52); The input end of the liquid phase outlet (12) is connected to the lower part of the vertical separator (1), the output end of the liquid phase outlet (12) is connected to the liquid and sand discharge pipeline (5), and the liquid phase flow meter (51) is arranged on the liquid and sand discharge pipeline (5); and a liquid and sand discharge valve (52) is arranged at the end of the liquid and sand discharge pipeline (5).

9. The device according to claim 8, characterized in that The device further comprises: a liquid level meter (14); the liquid level meter (14) is installed on the outer surface of the vertical separator (1).

10. The device according to claim 9, characterized in that The device further comprises: a controller (6), the controller (6) being respectively connected in communication with the liquid level meter (14) and the liquid and sand discharge valve (52).

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