Coal bed gas horizontal well channeling recovery device

Abstract

The utility model relates to coal bed gas exploitation collection and transportation technical field especially relates to a kind of coal bed gas horizontal well channeling recovery device, to solve the technical problem of double risk of resource waste and environmental protection safety in related art due to the methane that underground separator has failed to intercept along tubing wellhead disperses, to lead to. The coal bed gas horizontal well channeling recovery device includes: shell, gas-liquid separation component and exhaust component, shell is equipped with liquid inlet, gas-liquid separation component includes separation umbrella.The coal bed gas horizontal well channeling recovery device is separated umbrella by being set to face liquid inlet, and gas-liquid mixture is impacted in the tip of separation umbrella under the action of pressure, and under the inertia difference of gas and liquid, it is divided into liquid film along umbrella face spreading and the gas flow that turns back, and separated gas is recycled by exhaust component. Overcome the technical problem of double risk of resource waste and environmental protection safety in existing horizontal well gas recovery system due to the methane that underground separator has failed to intercept along tubing wellhead disperses, to lead to.

Description

Technical Field

[0001] This utility model relates to the field of coalbed methane development, collection and transportation technology, and in particular to a coalbed methane horizontal well gas leakage recovery device. Background Technology

[0002] In traditional vertical well coalbed methane extraction, downhole separators, installed longitudinally along the shaft, naturally separate the produced gas and liquid through gravity and elevation differences. However, with the widespread adoption of horizontal wells, downhole separators are forced to be installed horizontally. This reduction in elevation difference significantly weakens separation efficiency, leading to incomplete gas-liquid separation. Large amounts of unretained harmful gases, such as methane, escape through the tubing and continue to dissipate at the wellhead. This not only wastes coalbed methane resources but also poses a risk of combustion and explosion, while exacerbating global warming.

[0003] Existing horizontal well gas production systems have a technical problem: methane that cannot be contained by downhole separators can escape along the wellhead of the tubing, leading to both resource waste and environmental and safety risks. Utility Model Content

[0004] The purpose of this utility model is to provide a coalbed methane horizontal well gas leakage recovery device to solve the technical problem in related technologies where methane that cannot be intercepted by the downhole separator escapes along the wellhead of the oil pipe, resulting in both resource waste and environmental and safety risks.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0006] The coalbed methane horizontal well channel gas recovery device provided by this utility model includes:

[0007] The system comprises a housing, a gas-liquid separation assembly, an exhaust assembly, and a liquid discharge assembly. The housing has a liquid inlet connected to the discharge port of the rodless pump. The gas-liquid separation assembly includes a separating umbrella, which is conical with its tip facing the liquid inlet. The pressurized gas-liquid mixture entering through the liquid inlet impacts the tip of the separating umbrella and, due to the difference in inertia between gas and liquid, separates into a liquid film spreading along the umbrella surface and a reversing airflow. The separated liquid and gas are discharged to a water tank and a gas collection pipeline system, respectively, through the liquid discharge assembly and the exhaust assembly.

[0008] Specifically, the gas-liquid separation assembly further includes a screen tube, which is coaxially arranged around the outer periphery of the separation umbrella. One end of the screen tube is connected to the liquid inlet, and the other end has an annular gap with the separation umbrella. An exhaust port is provided on the outer periphery of the screen tube near the liquid inlet. The screen tube guides the pressurized gas-liquid mixture to impact the separation umbrella, the annular gap allows a liquid film to pass through, and the exhaust port allows reversed airflow to pass through.

[0009] Specifically, the drainage assembly includes a drainage pipe, a support frame, a valve stem, a valve plate, and a valve-opening float. The outer casing has a drainage port, which is connected to a water tank via the drainage pipe. The support frame is mounted on the outer casing, and the valve stem is slidably mounted on the support frame in a vertical direction, coaxially arranged with the drainage port. The valve-opening float and the valve plate are located at the upper and lower ends of the valve stem, respectively. The gravity of the valve stem and valve plate causes the valve stem to move downwards to switch to a first state, thereby causing the valve plate to block the drainage port. The buoyancy of the valve-opening float causes the valve stem to move upwards against gravity to switch to a second state, thereby causing the valve plate to open the drainage port.

[0010] Specifically, it also includes a liquid level accumulation assembly, which comprises a first wedge, a second wedge, and a rocker arm. The first wedge has a first working surface and a second working surface on its two sides, respectively. The first wedge and the second wedge have the same shape and are respectively mounted on one end of the valve stem and the rocker arm. The end of the rocker arm away from the second wedge is hinged to the housing. The swinging of the rocker arm is used to drive the second wedge to press horizontally against the first wedge. When the first wedge is below or above the second wedge, the second wedge applies vertical resistance to the first wedge through the contact of the first working surface or the second working surface, thereby limiting the sliding of the first wedge in the vertical direction. The resultant force of the buoyancy of the valve float, the weight of the valve stem and valve plate, and the vertical resistance is used to drive the valve stem to move vertically.

[0011] Specifically, the liquid level accumulation assembly also includes a valve-closing float. The valve-closing float is installed at the end of the swing arm away from the hinge axis. The buoyancy generated by the valve-closing float is used to drive the swing arm to swing towards the first wedge, thereby causing the second wedge to press against the first wedge.

[0012] Specifically, with the rotation axis of the swing arm as the center, there is an angular difference between the second wedge and the valve-closing float, with the valve-closing float located on the side of the second wedge away from the first wedge. This angular difference is used to adjust the effective lever arm of the buoyancy of the valve-closing float on the swing arm, thereby changing the swing torque of the swing arm and consequently adjusting the clamping force of the second wedge on the first wedge.

[0013] Specifically, the first working surface is set as a sloped surface with a small inclination, and the second working surface is set as an arc surface. The equivalent slope of the contact position between the arc surfaces is always greater than the slope of the sloped surface.

[0014] Specifically, the gas-liquid separation assembly further includes a water-distributing umbrella, which is installed at the end of the screen tube away from the liquid inlet. The water-distributing umbrella is configured as a conical shape, with its larger diameter end facing away from the separation umbrella. The vertical projection of the water-distributing umbrella covers the drainage assembly and the liquid level accumulation assembly, guiding the liquid discharged from the screen tube to fall from the annular space between the water-distributing umbrella and the outer shell, thus avoiding impact on the drainage assembly and the liquid level accumulation assembly.

[0015] Specifically, it also includes a safety relief assembly, which comprises a safety relief pipe and a safety relief float valve. The safety relief pipe is connected to the outer casing, and the opening of the pipe is higher than the valve-opening float. The safety relief float valve is installed on the safety relief pipe and is used to open when the liquid level is higher than the opening of the pipe to prevent the liquid level from becoming too high.

[0016] Specifically, the exhaust assembly includes an exhaust pipe and a float valve, a check valve, and a flow meter installed on the exhaust pipe. The housing is connected to the gas collection line system via the exhaust pipe. The float valve allows gas to pass through while blocking liquid. The check valve blocks the flow of gas from the gas collection line system toward the housing. The flow meter displays the flow rate of gas discharged along the exhaust pipe.

[0017] Based on the above technical solutions, the beneficial effects of this utility model are analyzed as follows:

[0018] This utility model provides a coalbed methane horizontal well channeling recovery device, comprising:

[0019] The system comprises a housing, a gas-liquid separation assembly, an exhaust assembly, and a liquid discharge assembly. The housing has a liquid inlet connected to the discharge port of the rodless pump. The gas-liquid separation assembly includes a separating umbrella, which is conical with its tip facing the liquid inlet. The pressurized gas-liquid mixture entering through the liquid inlet impacts the tip of the separating umbrella and, due to the difference in inertia between gas and liquid, separates into a liquid film spreading along the umbrella surface and a reversing airflow. The separated liquid and gas are discharged to a water tank and a gas collection pipeline system, respectively, through the liquid discharge assembly and the exhaust assembly.

[0020] In practical applications, the liquid inlet of the outer shell is connected to the discharge port of the rodless pump. The pressurized gas-liquid mixture discharged through the liquid inlet impacts the tip of the separation umbrella and, due to the inertial difference between the gas and the liquid, is separated into a liquid film spreading along the umbrella surface and a reversing airflow, thus successfully achieving the separation of gas and liquid. The separated liquid and gas are discharged to the water tank and the gas collection pipeline system for recovery through the liquid discharge assembly and the gas exhaust assembly, respectively.

[0021] As can be seen, compared with existing technologies, this coalbed methane horizontal well gas leakage recovery device, by setting a separation umbrella directly opposite the liquid inlet, allows the discharged gas-liquid mixture to impact the tip of the separation umbrella under pressure. Due to the inertial difference between gas and liquid, it separates into a liquid film spreading along the umbrella surface and a reversing gas flow. The separated gas is then recovered through the exhaust assembly. This overcomes the technical problem of existing horizontal well gas production systems where methane that cannot be trapped by the downhole separator escapes along the wellhead, leading to both resource waste and environmental and safety risks. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the overall structure of the coalbed methane horizontal well gas leakage recovery device provided in this embodiment of the utility model;

[0024] Figure 2 This is a schematic diagram of the liquid level accumulation assembly.

[0025] icon:

[0026] 100. Outer casing; 101. Liquid inlet; 102. Liquid outlet;

[0027] 200. Gas-liquid separation assembly; 210. Separation umbrella; 220. Screen tube; 230. Water separating umbrella;

[0028] 300. Exhaust assembly; 310. Exhaust piping; 320. Float valve; 330. Check valve; 340. Flow meter;

[0029] 400. Drainage assembly; 410. Drainage pipeline; 420. Support frame; 430. Valve stem; 440. Valve plate; 450. Valve opening float;

[0030] 500, Liquid level accumulation assembly; 510, First wedge; 501, First working surface; 502, Second working surface; 520, Second wedge; 530, Swing rod; 540, Valve closing float;

[0031] 600. Safety relief assembly; 610. Safety relief pipe; 620. Safety relief float valve; Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0034] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0035] Existing horizontal well gas production systems have a technical problem: methane that cannot be contained by downhole separators can escape along the wellhead of the tubing, leading to both resource waste and environmental and safety risks.

[0036] In view of this, the present invention provides a coalbed methane horizontal well channeling recovery device, comprising:

[0037] The system comprises a housing 100, a gas-liquid separation assembly 200, an exhaust assembly 300, and a liquid discharge assembly 400. The housing 100 has a liquid inlet 101, which connects to the discharge port of the rodless pump. The gas-liquid separation assembly 200 includes a separation umbrella 210, which is conical with its tip facing the liquid inlet 101. The pressurized gas-liquid mixture at the liquid inlet 101 impacts the tip of the separation umbrella 210 and, due to the difference in inertia between the gas and liquid, separates into a liquid film spreading along the umbrella surface and a reversing airflow. The separated liquid and gas are discharged to a water tank and a gas collection pipeline system, respectively, through the liquid discharge assembly 400 and the exhaust assembly 300.

[0038] In summary, the coalbed methane horizontal well gas leakage recovery device provided by this utility model can achieve the following technical effects:

[0039] This coalbed methane horizontal well gas leakage recovery device uses a separation umbrella 210 directly opposite the inlet 101. The discharged gas-liquid mixture impacts the tip of the separation umbrella 210 under pressure, and due to the inertial difference between gas and liquid, it separates into a liquid film spreading along the umbrella surface and a reversing gas flow. The separated gas is recovered through the exhaust assembly 300. This overcomes the technical problem of existing horizontal well gas production systems where methane, which cannot be contained by the downhole separator, escapes along the wellhead, leading to both resource waste and environmental and safety risks.

[0040] The following combination Figures 1 to 2 The structure and shape of the coalbed methane horizontal well gas leakage recovery device provided in this embodiment are described in detail:

[0041] To improve the gas-liquid separation efficiency of the separating umbrella 210, in this embodiment, the gas-liquid separation assembly 200 further includes a screen tube 220, which is coaxially surrounding the outer periphery of the separating umbrella 210. One end of the screen tube 220 is connected to the liquid inlet 101, and the other end has an annular gap with the separating umbrella 210. An exhaust port is provided on the outer periphery of the end of the screen tube 220 near the liquid inlet 101. The screen tube 220 is used to guide the pressurized gas-liquid mixture to impact the separating umbrella 210, the annular gap allows the liquid film to pass through, and the exhaust port allows the reversed airflow to pass through.

[0042] Regarding the structural composition of the drainage assembly 400, specifically:

[0043] The drainage assembly 400 includes a drainage pipe 410, a support frame 420, a valve stem 430, a valve plate 440, and a valve-opening float 450. The outer casing 100 has a drainage port 102, which is connected to the water tank via the drainage pipe 410. The support frame 420 is mounted on the outer casing 100, and the valve stem 430 is slidably mounted on the support frame 420 in a vertical direction and coaxially arranged with the drainage port 102. The valve-opening float 450 and the valve plate 440 are located at the upper and lower ends of the valve stem 430, respectively. The gravity of the valve stem 430 and the valve plate 440 is used to move the valve stem 430 downward to switch to a first state, thereby causing the valve plate 440 to block the drainage port 102. The buoyancy of the valve-opening float 450 is used to move the valve stem 430 upward against gravity to switch to a second state, thereby causing the valve plate 440 to open the drainage port 102.

[0044] To reduce the disturbance to downstream processes caused by the frequent opening and closing of the drain port 102, and to mitigate the problem of continuous liquid impact on downstream pipelines through intermittent high-flow discharge, this embodiment also includes a liquid level accumulation assembly 500. The liquid level accumulation assembly 500 includes a first wedge 510, a second wedge 520, and a rocker arm 530. The first wedge 510 has a first working surface 501 and a second working surface 502 on both sides. The first wedge 510 and the second wedge 520 have the same shape and are respectively installed on the valve stem 430 and one end of the rocker arm 530. The end of the rocker arm 530 away from the second wedge 520 is hinged to the housing 100. The swinging motion of the rocker arm 530 is used to drive the second wedge 520 to press horizontally against the first wedge 510. When the first wedge 510 is located below or above the second wedge 520, the second wedge 520 applies vertical resistance to the first wedge 510 through the contact of the first action surface 501 or the second action surface 502, thereby restricting the sliding of the first wedge 510 in the vertical direction. The buoyancy of the valve float 450, the gravity of the valve stem 430 and the valve plate 440, and the resultant force of the vertical resistance are used to drive the valve stem 430 to move in the vertical direction. In the first state, the first wedge 510 is located below the second wedge 520, the two first action surfaces 501 are in contact, and the vertical resistance applied by the first action surfaces 501 to the first wedge 510 is a downward pressure. In the second state, the first wedge 510 is located above the second wedge 520, the two second action surfaces 502 are in contact, and the vertical resistance applied by the second action surfaces 502 to the first wedge 510 is an upward supporting force.

[0045] In this embodiment, the liquid level accumulation assembly 500 further includes a valve-closing float 540. The valve-closing float 540 is installed at the end of the rocker arm 530 away from the hinge axis. The buoyancy generated by the valve-closing float 540 drives the rocker arm 530 to swing towards the first wedge 510, thereby causing the second wedge 520 to press against the first wedge 510. The height of the valve-closing float 540 is lower than that of the valve-opening float 450. When the liquid level is lower than the valve-opening float 450 and higher than the valve-closing float 540, the pressing force of the second wedge 520 against the first wedge 510 reaches its maximum value.

[0046] In this embodiment, with the rotation axis of the swing rod 530 as the center, there is an angular difference between the second wedge 520 and the valve-closing float 540, with the valve-closing float 540 located on the side of the second wedge 520 away from the first wedge 510. The angular difference is used to adjust the effective lever arm of the buoyancy of the valve-closing float 540 on the swing of the swing rod 530, thereby changing the swing torque of the swing rod 530, and further adjusting the clamping force of the second wedge 520 on the first wedge 510.

[0047] In this embodiment, the first working surface 501 is set as a sloped surface with a small inclination, and the second working surface 502 is set as an arc surface. The equivalent slope at the contact position between the arc surfaces is always greater than the slope of the sloped surface. The arc surface is used to avoid additional locking torque caused by the shape of the contact surface, thereby preventing self-locking. Due to the small inclination of the first working surface 501, the pressure exerted by the second wedge 520 on the first wedge 510, which hinders the upward movement of the first wedge 510, is negligible.

[0048] When the liquid level reaches the valve opening float 450 and continues to rise, the buoyancy of the valve opening float 450 is greater than the weight of the valve stem 430 and the valve plate 440. The buoyancy of the valve opening float 450 can drive the first wedge 510 to push the second wedge 520 upward, thereby causing the valve stem 430 to switch to the second state, the valve plate 440 to rise with the liquid level and open the drain port 102.

[0049] When the liquid level drops to between the open valve float 450 and the closed valve float 540, the buoyancy of the open valve float 450 disappears, and only the supporting force exerted by the second wedge 520 on the first wedge 510 to resist the gravity of the valve stem 430 and the valve plate 440 is used to prevent the valve stem 430 and the valve plate 440 from moving downward.

[0050] As the liquid level continues to drop, the valve-closing float 540 descends with the liquid level, and the buoyancy of the valve-closing float 540 decreases synchronously. The swing torque of the swing rod 530 also decreases, and the clamping force of the second wedge 520 on the first wedge 510 decreases. When the supporting force is less than the weight of the valve stem 430 and the valve plate 440, the weight of the valve stem 430 and the valve plate 440 drives the first wedge 510 to push the second wedge 520 downward, thereby switching the valve stem 430 to the first state, and the valve plate 440 sinks and blocks the drain port 102.

[0051] To prevent the liquid flow discharged from the screen tube 220 from directly impacting the drainage assembly 400 and the liquid level accumulation assembly 500, in this embodiment, the gas-liquid separation assembly 200 further includes a water-distributing umbrella 230, which is installed at the end of the screen tube 220 away from the liquid inlet 101. The water-distributing umbrella 230 is configured as a conical part, with its large-diameter end facing away from the separation umbrella 210. The vertical projection of the water-distributing umbrella 230 covers the drainage assembly 400 and the liquid level accumulation assembly 500, guiding the liquid discharged from the screen tube 220 to fall from the annular space between the water-distributing umbrella 230 and the outer shell 100, thus avoiding impact on the drainage assembly 400 and the liquid level accumulation assembly 500.

[0052] To prevent excessively high liquid levels due to drainage malfunctions, this embodiment also includes a safety relief assembly 600, which comprises a safety relief pipe 610 and a safety relief float valve 620. The safety relief pipe 610 is connected to the housing 100, and its opening is higher than the valve-opening float 450. The safety relief float valve 620 is installed on the safety relief pipe 610 and is used to open when the liquid level is higher than the opening of the pipe to prevent excessively high liquid levels.

[0053] Specifically, regarding the composition of the exhaust assembly 300:

[0054] The exhaust assembly 300 includes an exhaust pipe 310 and a float valve 320, a check valve 330, and a flow meter 340 installed on the exhaust pipe 310. The housing 100 is connected to a gas collection line system via the exhaust pipe 310. The float valve 320 allows gas to pass through while blocking liquid flow. The check valve 330 blocks the flow of gas from the gas collection line system towards the housing 100. The flow meter 340 displays the flow rate of gas discharged along the exhaust pipe 310.

[0055] In summary, the specific working process of the coalbed methane horizontal well gas leakage recovery device provided in this embodiment is as follows:

[0056] Taking the initial state of valve stem 430 as the first state, and the first wedge 510 located below the second wedge 520 as an example.

[0057] The inlet 101 of the outer casing 100 is connected to the outlet of the rodless pump. The pressurized gas-liquid mixture discharged through the inlet 101 impacts the tip of the separating umbrella 210 along the screen tube 220, and is separated into a liquid film spreading along the umbrella surface and a reversing airflow due to the inertial difference between the gas and liquid. The separated gas is discharged through the exhaust port of the screen tube 220 and discharged to the gas collection pipeline system for recovery through the exhaust pipe 310. The separated liquid falls from the annular space between the water separating umbrella 230 and the outer casing 100 and accumulates, causing the liquid level to gradually rise.

[0058] When the liquid level reaches the initial height of the valve-closing float 540, as the liquid level continues to rise, the buoyancy of the valve-closing float 540 drives the second wedge 520 to press against the first wedge 510 through the swing of the rocker arm 530, and the first working surfaces 501 of the second wedge 520 and the first wedge 510 abut together.

[0059] Once the liquid level reaches the initial height of the valve-opening float 450, as the liquid level continues to rise, the buoyancy of the valve-opening float 450 exceeds the weight of the valve stem 430 and valve plate 440. This buoyancy causes the first wedge 510 to push the second wedge 520 upwards, thus switching the valve stem 430 to the second state. The valve plate 440 then rises with the liquid level and opens the drain port 102. The separated liquid flows through the drain port 102 and the drain pipe 410 into the water tank, causing the liquid level to continuously decrease.

[0060] When the liquid level drops to between the open valve float 450 and the closed valve float 540, the buoyancy of the open valve float 450 disappears, and only the supporting force exerted by the second wedge 520 on the first wedge 510 to resist the gravity of the valve stem 430 and the valve plate 440 is used to prevent the valve stem 430 and the valve plate 440 from moving downward.

[0061] As the liquid level continues to drop, the valve-closing float 540 descends with the liquid level, and the buoyancy of the valve-closing float 540 decreases synchronously. The swing torque of the swing rod 530 also decreases, and the clamping force of the second wedge 520 on the first wedge 510 decreases. When the supporting force is less than the weight of the valve stem 430 and the valve plate 440, the weight of the valve stem 430 and the valve plate 440 drives the first wedge 510 to push the second wedge 520 downward, thereby switching the valve stem 430 to the first state, and the valve plate 440 sinks and blocks the drain port 102.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A coal bed gas horizontal well channeling recovery apparatus, characterized by, include: The system comprises a housing, a gas-liquid separation component, an exhaust component, and a liquid discharge component. The housing has an inlet that connects to the discharge port of the rodless pump. The gas-liquid separation component includes a separation umbrella, which is cone-shaped with its tip facing the inlet. The pressurized gas-liquid mixture at the inlet impacts the tip of the separation umbrella and, due to the difference in inertia between the gas and liquid, is separated into a liquid film spreading along the umbrella surface and a reversing airflow. The separated liquid and gas are discharged to a water tank and a gas collection pipeline system, respectively, through the liquid discharge component and the exhaust component.

2. The coalbed methane horizontal well channeling recovery device according to claim 1, characterized in that: The gas-liquid separation assembly also includes a sieve tube, which is coaxially surrounded around the outer periphery of the separation umbrella; One end of the sieve tube is connected to the liquid inlet, and the other end has an annular gap with the separation umbrella; An air vent is provided on the outer periphery of the screen tube near the liquid inlet. The sieve tube is used to guide the pressurized gas-liquid mixture to impact the separation umbrella, the annular slit allows the liquid film to pass through, and the exhaust port allows the reversed airflow to pass through.

3. The coalbed methane horizontal well channeling recovery device according to claim 2, characterized in that: The drainage assembly includes a drainage pipeline, a support frame, a valve stem, a valve plate, and a valve-opening float. The outer casing has a drain port, which is connected to the water tank through a drain pipe; The support frame is installed on the outer casing, and the valve stem is slidably installed on the support frame in the vertical direction and is coaxially arranged with the drain port; The valve float and valve plate are located at the upper and lower ends of the valve stem, respectively. The weight of the valve stem and valve plate is used to move the valve stem downward to switch to the first state, thereby causing the valve plate to block the drain port; The buoyancy of the valve float is used to drive the valve stem to move upward against gravity to switch to the second state, thereby causing the valve plate to open the drain port.

4. The coalbed methane horizontal well channeling recovery device according to claim 3, characterized in that: It also includes a liquid level accumulation assembly, which includes a first wedge, a second wedge, and a rocker arm; The first wedge has a first working surface and a second working surface on both sides. The first wedge and the second wedge have the same shape and are respectively installed on one end of the valve stem and the swing rod. The end of the swing arm away from the second wedge is hinged to the outer casing, and the swing of the swing arm is used to drive the second wedge to press against the first wedge in the horizontal direction; When the first wedge is located below or above the second wedge, the second wedge applies vertical resistance to the first wedge through the contact of the first or second action surface, thereby restricting the sliding of the first wedge in the vertical direction. The combined force of the buoyancy of the valve float, the weight of the valve stem and valve plate, and the vertical resistance is used to drive the valve stem to move vertically.

5. The coalbed methane horizontal well channeling recovery device according to claim 4, characterized in that: The liquid level accumulation assembly also includes a valve-closing float; The valve-closing float is installed at the end of the swing arm away from the hinge axis. The buoyancy generated by the valve-closing float is used to drive the swing arm to swing towards the first wedge, thereby driving the second wedge to press against the first wedge.

6. The coalbed methane horizontal well channeling recovery device according to claim 5, characterized in that: With the rotation axis of the swing arm as the center, there is an angular difference between the second wedge and the valve-closing float, with the valve-closing float located on the side of the second wedge away from the first wedge; The angle difference is used to adjust the effective lever arm of the buoyancy of the valve-closing float on the swing arm, thereby changing the swing torque of the swing arm, and thus adjusting the clamping force of the second wedge on the first wedge.

7. The coalbed methane horizontal well channeling recovery device according to claim 4, characterized in that: The first working surface is set as a sloped surface with a small inclination, and the second working surface is set as an arc surface. The equivalent slope at the contact point between the arc surfaces is always greater than the slope of the sloped surface.

8. The coalbed methane horizontal well channeling recovery device according to claim 4, characterized in that: The gas-liquid separation assembly also includes a water separator, which is installed at the end of the screen tube away from the liquid inlet; The water-dividing umbrella is designed as a cone-shaped component, with the larger diameter end facing away from the separating umbrella; The vertical projection of the water-distributing umbrella covers the drainage assembly and the liquid level accumulation assembly, which guides the liquid discharged from the screen tube to fall from the annular space between the water-distributing umbrella and the outer shell, thus avoiding impact on the drainage assembly and the liquid level accumulation assembly.

9. The coalbed methane horizontal well channeling recovery device according to claim 3, characterized in that: It also includes a safety relief assembly, which includes a safety relief pipe and a safety relief float valve; The safety relief pipe is connected to the outer casing, and the opening of the connecting pipe is higher than the valve opening float. The safety relief float valve is installed on the safety relief pipe and is used to open when the liquid level is higher than the connecting pipe opening to prevent the liquid level from becoming too high.

10. The coalbed methane horizontal well channeling recovery device according to claim 1, characterized in that: The exhaust assembly includes an exhaust pipe and a float valve, a check valve, and a flow meter installed on the exhaust pipe; The outer casing is connected to the air collection pipeline system via an exhaust pipe. A float valve is used to allow gas to pass through while blocking liquid from passing through; A check valve is used to block the flow of gas from the gas collection line system toward the housing; A flow meter is used to display the flow rate of gas discharged along an exhaust pipe.

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