A gas well sealed liquid discharge device and use method

Abstract

The application discloses a kind of gas well sealing liquid discharge device and use method, it is related to oil and gas well sealing liquid discharge technical field, including box, recovery mechanism and controller, box back is fixedly connected with controller;Recovery mechanism includes drive device and collection device, drive device is connected with collection device, and is set in the inside of box, the collection device includes first collection roller, the upper surface of first collection roller is fixedly connected with second collection roller, the outer bottom wall of first collection roller is connected drive device, inner bottom wall is fixedly connected with fixed seat, fixed seat is embedded with liquid pumping pump, the input end of liquid pumping pump is fixedly communicated with liquid pumping pipe right end, and output end is fixedly communicated with liquid outlet pipe left end, controller is electrically connected with drive device and liquid pumping pump;The application effectively avoids the time and effort of manual collection when using hose line connection liquid discharge ends, solves the problem that the recovery work of a large number of hose lines to human resources is huge test and the cost pressure of oil field operation to large-scale, multi-well site oil and gas field.

Description

Technical Field

[0001] This invention relates to the field of closed-loop drainage technology for oil and gas wells, specifically to a closed-loop drainage device for gas wells and its usage method. Background Technology

[0002] Gas well closed drainage technology is a key means to improve the extraction efficiency of natural gas wells in the later stage of production. As natural gas wells enter the later stage of production, the formation energy gradually decreases, and some wells are accompanied by formation water production. The formation water accumulates in the wellbore to form a water column of a certain height, which balances with the formation pressure in the well, causing natural gas to be unable to reach the surface from the well, and the downhole natural gas cannot be extracted.

[0003] To address this issue, methods such as mixed-gas-water drainage, liquid nitrogen drainage, and pump drainage are commonly used to extract liquids from oil and gas wells. Pump drainage is particularly advantageous due to its flexibility and high efficiency. However, this method also faces several significant challenges. Pump drainage requires placing the pump on the ground and connecting it to the wellhead via pipeline to extract the accumulated liquid. While flexible hoses are convenient for laying in complex terrain, their scattered locations after drainage operations present a significant retrieval challenge. Because these hoses are typically long and flexible, lacking rigid support, manual collection is not only time-consuming and labor-intensive but also prone to twisting, wear, or even breakage due to improper handling. This increases maintenance costs and may affect the safety and reliability of subsequent use. Furthermore, for large-scale, multi-well oil and gas fields, the retrieval of numerous hoses places a heavy burden on human resources, further exacerbating operational costs.

[0004] While the pump drainage method in gas well closed drainage technology is highly effective, the problem of hose retrieval also needs attention. Therefore, there is an urgent need for a gas well closed drainage device that can solve the problem of the laborious manual collection of hoses when using surface pumps for drainage and gas extraction.

[0005] The purpose of this invention is to provide a closed drainage device for gas wells, which can automatically recover pipelines extending into the oil and gas well through a recovery mechanism, and is equipped with a sorting device to reduce the resistance generated when the pipeline moves. This overcomes the shortcomings of the prior art, which is that manual collection of hoses is time-consuming and labor-intensive, and is also prone to pipeline twisting, wear or even damage due to improper operation. It also has high maintenance costs, is time-consuming and labor-intensive, and may affect the safety and reliability of subsequent use.

[0006] To achieve the above objectives, the present invention provides a closed-loop drainage device for gas wells, the specific technical solution of which is as follows:

[0007] It includes a container, a recycling mechanism, and a controller, with the controller fixedly connected to the back of the container;

[0008] The recovery mechanism includes a drive unit and a collection unit. The drive unit is connected to the collection unit and is located inside the housing. The collection unit includes a first collection roller, a second collection roller is fixedly connected to the upper surface of the first collection roller, the drive unit is connected to the outer bottom wall of the first collection roller, and a fixed base is fixedly connected to the inner bottom wall. A pump is embedded in the fixed base. The input end of the pump is fixedly connected to the right end of the pumping pipe, and the output end is fixedly connected to the left end of the outlet pipe. The controller is electrically connected to the drive unit and the pump. The drive unit provides operating power to the collection unit. When the drive unit rotates, it drives the collection unit to rotate. The rotating collection unit collects the pumping lines, pumping pipes, and outlet pipes that extend into the oil and gas well.

[0009] Furthermore, the driving device includes a stepper motor, the output end of which is fixedly connected to a rotating shaft, and the inner wall of the housing is fixedly connected to a bearing. The rotating shaft is embedded in the inner wall of the bearing, and the top of the rotating shaft is fixedly connected to a first collecting roller.

[0010] Furthermore, a sorting device is provided on both sides of the box body; the sorting device includes a rectangular plate, which is fixedly connected to the side of the box body. Multiple telescopic rods are fixedly connected to the upper surface of the rectangular plate. Each telescopic rod is electrically connected to the controller via a wire. A fixing ring is fixedly connected to the telescopic ends of the multiple telescopic rods. A long groove is formed at one end of the fixing ring near the telescopic end of the telescopic rod, and a rotating shaft is rotatably connected to the inner wall of the long groove. By providing the telescopic rods and the rectangular plate, the rectangular plate can provide support for the telescopic rods, ensuring that the telescopic rods have sufficient force-bearing positions. By providing the fixing ring and the rotating shaft, during device operation, the pumping pipe and outlet pipe extending into the oil and gas well will first pass through the interior of the fixing ring. The rotating shaft inside the fixing ring can rotate in the same direction as the pumping pipe, outlet pipe, and outlet pipe when they pass through, reducing the resistance generated during pipeline movement. This effectively prevents the pipeline from being twisted, worn, or even damaged due to significant resistance during device use.

[0011] Furthermore, the outer surface of the rotating shaft is fixedly connected with a roller to reduce friction when retrieving the pumping lines, pumping pipes, and outlet pipes that extend into the oil and gas well, thereby preventing pipeline twisting, wear, or even damage, increasing pipeline service life, and reducing maintenance costs.

[0012] Furthermore, a fixing block is fixedly connected to one end of the inner wall of the housing, and the other end of the fixing block is connected to the bottom of the stepper motor. By setting the fixing block, the stepper motor can be fixed, ensuring that the stepper motor runs more stably during use and does not shift.

[0013] Furthermore, a base plate is fixed to the bottom of the housing, and two sets of casters are fixedly connected to the bottom of the base plate. The device can be moved by the base plate and the casters, thereby reducing the resistance generated when the device moves.

[0014] Furthermore, a push handle is fixedly connected to the upper surface of the base plate. The back of the push handle contacts the front of the housing. By providing the push handle, the device can be moved by pushing the handle, thereby facilitating the application of thrust to the device.

[0015] Furthermore, the left end of the suction tube extends through the first collecting roller to the outside of the first collecting roller and passes through the inside of the retaining ring.

[0016] Furthermore, the right end of the outlet pipe extends through the second collecting roller to the outside of the second collecting roller and passes through the inside of the retaining ring.

[0017] Furthermore, the present invention also provides a method for using a gas well closed drainage device, specifically including the following steps:

[0018] Connect the pumping pipeline that needs to be extended into the oil and gas well to the pumping pipe, and control the operation of the pumping pump to extract the accumulated liquid inside the oil and gas well.

[0019] When there are signs of a blowout in an oil or gas well, stop operating the pumping unit.

[0020] The stepper motor is controlled to rotate. When the stepper motor rotates, it transmits the power generated during operation to the first and second collecting rollers through the rotating shaft, thereby driving the first and second collecting rollers to rotate; extending into the oil and gas well to the pumping pipeline, pumping pipe, and outlet pipe;

[0021] When the pump is running, the pumping lines, pumping pipes, and outlet pipes extending into the oil and gas well will first pass through the rotating shaft and roller inside the fixed ring, and then the pumping pipes and pumping lines extending into the oil and gas well will be wrapped around the side of the first collecting roller, and the outlet pipes will be wrapped around the side of the second collecting roller, until all the lines are recovered.

[0022] Compared with the prior art, the present invention has the following beneficial technical effects:

[0023] This invention provides a closed-loop drainage device for gas wells. Through a recovery mechanism equipped with a drive device and a collection device, the power generated by the drive device during operation is transmitted to other devices. Through the cooperation of a pump, a pumping pipe, a discharge pipe, a first collection roller, and a second collection roller, the pump provides power to the pumping pipe, thereby extracting the downhole fluid and discharging it through the discharge pipe, thus treating the accumulated downhole fluid. The first and second collection rollers rotate together under the power transmitted from the drive device, thereby winding the pumping pipe (which extends into the oil and gas well) around the side of the first collection roller and the discharge pipe around the side of the second collection roller. This invention effectively avoids the time-consuming and labor-intensive manual collection required when using hose connections at the end of drainage, solving the problem of the enormous human resource burden of recovering a large number of hoses, especially in large-scale, multi-well oil and gas fields, which further exacerbates the cost pressure of oil field operations.

[0024] Furthermore, the driving device of the present invention, through the cooperation between the stepper motor, the rotating shaft and the bearing, enables the rotating shaft to rotate by the operation of the stepper motor, and the rotating shaft can rotate more stably inside the bearing. Thus, the power generated by the stepper motor can be transmitted to other devices through the rotating shaft. In addition, a fixing block is set between the stepper motor and the housing, which can fix the stepper motor and ensure that the rotation of the stepper motor is more stable.

[0025] Furthermore, the present invention includes a sorting device. Through the cooperation between the rectangular plate, the telescopic rod, the fixed ring, and the rotating shaft, the rectangular plate provides support for the telescopic rod, ensuring that the telescopic rod has sufficient force-bearing position. The inner wall of the fixed ring is rotatably connected to the rotating shaft. By setting the fixed ring and the rotating shaft, and by setting the roller on the rotating shaft, the rotating shaft and the roller can rotate inside the fixed ring, reducing the resistance when recovering the pumping pipeline, pumping pipe, and discharge pipe extending into the oil and gas well, avoiding pipeline twisting, wear, or even damage, increasing the service life of the pipeline, and reducing maintenance costs. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the gas well closed drainage device in an embodiment of the present invention.

[0027] Figure 2 This is a schematic diagram of the collection device structure of the gas well closed drainage device in an embodiment of the present invention.

[0028] Figure 3 This is a schematic diagram of the drive device structure of the gas well closed drainage device in an embodiment of the present invention.

[0029] Figure 4 This is a schematic diagram of the finishing device structure of the gas well closed drainage device in an embodiment of the present invention.

[0030] Figure 5 This is a schematic diagram of the controller structure of the gas well closed drainage device in an embodiment of the present invention.

[0031] In the diagram, 1. Box body; 2. Recycling mechanism; 201. Second collecting roller; 202. First collecting roller; 203. Liquid extraction pipe; 204. Liquid extraction pump; 205. Liquid outlet pipe; 206. Fixed base; 207. Rotating shaft; 208. Bearing; 209. Stepper motor; 210. Controller; 3. Casters; 4. Base plate; 5. Push handle; 6. Rectangular plate; 7. Telescopic rod; 8. Fixing ring; 9. Fixing block; 10. Roller; 11. Rotating shaft. Detailed Implementation

[0032] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0033] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0034] This invention provides a closed-loop drainage device for gas wells, which can automatically recover pipelines extending into the oil and gas well through a recovery mechanism. It is equipped with a sorting device to reduce the resistance generated when the pipeline moves, avoiding problems such as pipeline twisting, wear, or even breakage during the recovery process. It effectively avoids the time-consuming and labor-intensive manual collection when the drainage is completed using flexible hoses. This invention solves the problem that, especially for large-scale, multi-well oil and gas fields, the recovery of a large number of pipelines is a huge test of human resources, further exacerbating the cost pressure of oil field operations.

[0035] Example 1

[0036] See Figures 1 to 2The present invention provides a gas well closed drainage device, comprising a housing 1, a recovery mechanism 2 and a controller 210, wherein the controller 210 is fixedly connected to the back of the housing 1.

[0037] The recovery mechanism 2 includes a drive device and a collection device. The drive device is connected to the collection device and is located inside the housing 1. The collection device includes a first collection roller 202 and a second collection roller 201 fixedly connected to the upper surface of the first collection roller 202. When the drive device is running, it can drive the first collection roller 202 and the second collection roller 201 to rotate. The outer bottom wall of the first collection roller 202 is connected to the drive device, and the inner bottom wall is fixedly connected to a fixed seat 206. The fixed seat 206 is embedded with a liquid pump 204. The input end of the liquid pump 204 is fixedly connected to the right end of the liquid extraction pipe 203, and the output end is fixedly connected to the left end of the liquid outlet pipe 205. The controller 210 is electrically connected to the drive device and the liquid pump 204, and can control the drive device to rotate and control the liquid pump 204 to extract the accumulated liquid inside the oil and gas well.

[0038] Example 2

[0039] See Figure 1 , Figure 2 and Figure 5 Based on Embodiment 1, the driving device used in this invention includes a stepper motor 209. A rotating shaft 207 is fixedly connected to the output end of the stepper motor 209. A bearing 208 is fixedly connected to the inner wall of the housing 1. The rotating shaft 207 is embedded within the inner wall of the bearing 208. A first collecting roller 202 is fixedly connected to the top of the rotating shaft 207. A second collecting roller 201 is fixedly connected to the upper surface of the first collecting roller 202. A fixing block 9 is fixedly connected to the inner wall of the housing 1. The inner wall of the fixing block 9 is fixedly connected to the outer surface of the stepper motor 209. By providing the fixing block 9, the stepper motor 209 can be fixed, ensuring more stable operation during use. The stepper motor 209 is electrically connected to the controller 210 to control its rotation. The stepper motor 209 drives the rotating shaft 207 to rotate. The rotating shaft 207 rotates more stably within the bearing 208, thereby transmitting the power generated by the stepper motor 209 during operation to other devices via the rotating shaft.

[0040] Example 3

[0041] See Figure 2 and Figure 3Based on Embodiment 2, the gas well closed drainage device provided by the present invention is further provided with a sorting device, which is set on both sides of the box body. The sorting device includes a rectangular plate 6, which is fixedly connected to the side of the box body 1. Multiple telescopic rods 7 are fixedly connected to the upper surface of the rectangular plate 6. Each telescopic rod 7 is electrically connected to the controller 210 through a wire. By setting the telescopic rods 7 and the rectangular plate 6, the rectangular plate 6 can provide support for the telescopic rods 7, ensuring that the telescopic rods 7 have sufficient force-bearing positions. The telescopic ends of the multiple telescopic rods 7 are fixedly connected to a fixing ring 8. The fixing ring 8 has a long groove at one end near the telescopic end of the telescopic rod 7. A rotating shaft 11 is rotatably connected to the inner wall of the long groove. The left end of the suction pipe 203 extends through the first collecting roller 202 to the first collecting roller 203. The right end of the outlet pipe 205 extends through the second collecting roller 201 to the outside of the second collecting roller 201 and passes through the inside of the fixed ring 8. By setting the fixed ring 8 and the rotating shaft 11, when the device is running, the pumping pipe 203, the pumping line extending into the oil and gas well and the outlet pipe 205 will first pass through the inside of the fixed ring 8. The rotating shaft 11 set inside the fixed ring 8 can rotate in the same direction as the pumping pipe 203 and the outlet pipe 205 when they pass through. This can reduce the resistance generated when the pipeline moves, and thus effectively avoid the pipeline from being twisted, worn or even broken due to large resistance when the device is in use.

[0042] Example 4

[0043] See Figures 2 to 4 Based on embodiment 3, the controller 210 is electrically connected to the stepper motor 209 and the pump 204 via wires. A roller 10 is fixedly connected to the outer surface of each rotating shaft 11. The left end of the pumping pipe 203 extends through the first collecting roller 202 to the outside of the first collecting roller 202 and passes through the inside of the fixing ring 8. The right end of the outlet pipe 205 extends through the second collecting roller 201 to the outside of the second collecting roller 201 and passes through the inside of the fixing ring 8. By setting the roller 10, when the device is running, the pumping pipe 203, the pumping pipeline extending into the oil and gas well and the outlet pipe 205 pass through the fixing ring 8. Through the cooperation of the rotating shaft 11 and the roller 10, the friction experienced by the pumping pipe 203 and the outlet pipe 205 during recovery can be reduced, avoiding pipeline twisting, wear or even breakage, increasing the service life of the pipeline and reducing maintenance costs.

[0044] Example 5

[0045] See Figure 1Based on embodiment 4, a base plate 4 is fixedly connected to the bottom surface of the housing 1, and two sets of casters 3 are fixedly connected to the bottom surface of the base plate 4. By setting the base plate 4 and the casters 3, the device can be moved by the base plate 4 and the casters 3, thereby reducing the resistance generated when the device moves. A bearing 208 is fixedly connected to the inner wall of the housing 1, and a push handle 5 is fixedly connected to the upper surface of the base plate 4. The back of the push handle 5 is in contact with the front of the housing 1. By setting the push handle 5, the device can be moved by the push handle 5, thereby facilitating the application of thrust to the device.

[0046] Furthermore, the present invention also provides a method for using a gas well closed drainage device, specifically including the following steps:

[0047] Connect the pumping pipeline that needs to be extended into the oil and gas well to the pumping pipe 203, and control the operation of the pumping pump 204 to extract the accumulated liquid inside the oil and gas well.

[0048] When there are signs of a blowout in an oil or gas well, stop the operation of pump 204.

[0049] The stepper motor 209 is controlled to rotate. When the stepper motor 209 rotates, it transmits the power generated during operation to the first collecting roller 202 and the second collecting roller 201 through the rotating shaft 207, thereby driving the first collecting roller 202 and the second collecting roller 201 to rotate; extending into the oil and gas well are the pumping pipeline, the pumping pipe 203, and the outlet pipe 205.

[0050] When the pump 204 is running, the pumping pipeline, pumping pipe 203, and outlet pipe 205 extending into the oil and gas well will first pass through the rotating shaft 11 and roller 10 inside the fixed ring 8, and then the pumping pipe 203 and the pumping pipeline extending into the oil and gas well will be wrapped around the side of the first collecting roller 202, and the outlet pipe 205 will be wrapped around the side of the second collecting roller 201, until all pipelines are recovered.

[0051] Working principle of the invention:

[0052] First, connect the stepper motor 209, telescopic rod 7, pump 204, and controller 210 to the power supply. Once the power is connected, the device can be used normally. When using this device, push the handle 5 to move the device to the appropriate working position. Then, connect the pumping pipeline that needs to be extended into the oil and gas well to the pumping pipe 203. Subsequently, the pumping pump 204 can be controlled to operate normally to extract the accumulated liquid inside the oil and gas well. When the operator observes signs of a blowout in the oil and gas well, the pumping pump 204 can be stopped immediately. Then, control the stepper motor 209 to rotate. When the stepper motor 209 rotates, it will transmit the power generated during operation to the first collecting roller 202 and the second collecting roller 201 through the rotating shaft 207, thereby driving the first collecting roller 202 and the second collecting roller 201 to rotate. Since the pumping pipe 203 and the outlet pipe 205 are both inside the fixed ring 8, the pumping pump 204 rotates... During operation, the pumping pipe 203, the pumping line extending into the oil and gas well, and the outlet pipe 205 first pass through the inside of the fixing ring 8 and then wrap around the surfaces of the first collecting roller 202 and the second collecting roller 201. The rotating shaft 11 and the roller 10 installed inside the fixing ring 8 can rotate in the same direction as the extended pumping pipe 203 and outlet pipe 205 when they pass through, which can reduce the resistance generated when the pipeline moves. This effectively avoids the situation where the pipeline is twisted, worn, or even broken due to the large resistance when the device is in use. It also effectively avoids the time-consuming and laborious manual collection when the drainage is finished using a flexible hose connection. This solves the problem that the recovery of a large number of pipelines is a huge test of human resources, especially for large-scale, multi-well oil and gas fields, which further exacerbates the cost pressure of oil field operation.

[0053] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A method of using a closed-loop drainage device for gas wells, characterized in that, A closed-loop drainage device for gas wells is adopted. The device includes a housing (1), a recovery mechanism (2), and a controller (210). The controller (210) is fixedly connected to the back of the housing (1). The recycling mechanism (2) includes a driving device and a collecting device. The driving device is connected to the collecting device and is set inside the box (1). The collecting device includes a first collecting roller (202). A second collecting roller (201) is fixedly connected to the upper surface of the first collecting roller (202). The outer bottom wall of the first collecting roller (202) is connected to the driving device, and the inner bottom wall is fixedly connected to a fixed seat (206). A liquid pump (204) is embedded in the fixed seat (206). The input end of the liquid pump (204) is fixedly connected to the right end of the liquid pumping pipe (203), and the output end is fixedly connected to the left end of the liquid outlet pipe (205). The controller (210) is electrically connected to the driving device and the liquid pump (204). The driving device includes a stepper motor (209), the output end of which is fixedly connected to a rotating shaft (207), and the inner wall of the housing (1) is fixedly connected to a bearing (208). The rotating shaft (207) is embedded in the inner wall of the bearing (208), and the top of the rotating shaft (207) is fixedly connected to a first collecting roller (202). The method includes the following steps: Connect the pumping pipeline that needs to be extended into the oil and gas well to the pumping pipe (203), and control the operation of the pumping pump (204) to extract the accumulated liquid inside the oil and gas well; When there are signs of a blowout in an oil or gas well, stop the operation of the pumping pump (204); The stepper motor (209) is controlled to rotate. When the stepper motor (209) rotates, it will transmit the power generated during operation to the first collecting roller (202) and the second collecting roller (201) through the rotating shaft (207), thereby driving the first collecting roller (202) and the second collecting roller (201) to rotate; extending into the oil and gas well are the pumping pipeline, pumping pipe (203), and outlet pipe (205); When the pump (204) is running, the pumping line, pumping pipe (203), and outlet pipe (205) extending into the oil and gas well will first pass through the rotating shaft (11) and roller (10) inside the fixed ring (8), and then the pumping pipe (203) and the pumping line extending into the oil and gas well will be wrapped around the side of the first collecting roller (202), and the outlet pipe (205) will be wrapped around the side of the second collecting roller (201) until all the pipelines are recovered.

2. The gas well closed drainage device according to claim 1, characterized in that, The box (1) is provided with sorting devices on both sides; the sorting device includes a rectangular plate (6), which is fixedly connected to the side of the box (1). Multiple telescopic rods (7) are fixedly connected to the upper surface of the rectangular plate (6). Each telescopic rod (7) is electrically connected to the controller (210) through a wire. The telescopic ends of the multiple telescopic rods (7) are fixedly connected to a fixing ring (8). The fixing ring (8) has a long groove at one end near the telescopic end of the telescopic rod (7). A rotating shaft (11) is rotatably connected to the inner wall of the long groove.

3. A gas well closed-loop drainage device according to claim 2, characterized in that, A roller (10) is fixedly connected to the outer surface of the rotating shaft (11).

4. A gas well closed-loop drainage device according to claim 1, characterized in that, One end of the fixing block (9) is fixedly connected to the inner wall of the housing (1), and the other end of the fixing block (9) is connected to the bottom of the stepper motor (209).

5. A gas well closed-loop drainage device according to claim 1, characterized in that, The bottom of the box (1) is fixed with a base plate (4), and the bottom of the base plate (4) is fixedly connected with two sets of casters (3).

6. A gas well closed-loop drainage device according to claim 5, characterized in that, A push handle (5) is fixedly connected to the upper surface of the base plate (4).

7. A gas well closed-loop drainage device according to claim 1, characterized in that, The left end of the suction tube (203) extends through the first collecting roller (202) to the outside of the first collecting roller (202) and through the inside of the fixing ring (8).

8. A gas well closed-loop drainage device according to claim 2, characterized in that, The right end of the outlet pipe (205) extends through the second collecting roller (201) to the outside of the second collecting roller (201) and through the inside of the fixing ring (8).

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