Coal bed gas well monitoring device
By using a hose with a gas pressure regulating and telescopic structure to fix the sensor assembly in the coalbed methane well monitoring device, the problem of complex, time-consuming and labor-intensive maintenance of the existing device is solved, and convenient maintenance and cost reduction are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- INNER MONGOLIA NINTH GEOLOGY & MINERAL EXPLORATION & DEV CO LTD
- Filing Date
- 2025-07-31
- Publication Date
- 2026-07-14
AI Technical Summary
Existing coalbed methane well monitoring devices are complex, time-consuming, labor-intensive, and costly to maintain in the later stages.
It uses a hose with one end open, which is connected to a pressure regulating device and a pressure telescopic structure. When the internal air pressure increases, the hose extends to tighten the oil pipe and sleeve and fix them in the annular space. When the air pressure decreases, it shortens to facilitate disassembly. The cable is located inside the hose and connected to the sensor assembly, simplifying the maintenance process.
This enables convenient maintenance of sensor components, saving time and effort, reducing maintenance costs, and protecting the cables.
Smart Images
Figure CN224496410U_ABST
Abstract
Description
Technical Field
[0001] This application relates to coalbed methane extraction technology, and more particularly to a coalbed methane well monitoring device. Background Technology
[0002] During the coalbed methane drainage process, it is necessary to dynamically monitor parameters such as temperature, pressure, flow rate, and liquid level within the coalbed methane well to provide practical data for the scientific formulation or adjustment of the coalbed methane drainage process.
[0003] Currently, a commonly used coalbed methane well monitoring device includes a cable, sensor components, and a ground data conversion and transmission device. One end of the cable is connected to the sensor components, and the other end is connected to the ground data conversion and transmission device. The cable and sensor components are fixed to the outer wall of the tubing inside the coalbed methane well. The sensor components collect parameters of the annular space between the casing and tubing in the coalbed methane well and transmit the collected data to the ground data conversion and transmission device via the cable. The ground data conversion and transmission device then transmits the collected data to a computer network. The sensor components include pressure sensors, temperature sensors, flow sensors, and level sensors.
[0004] However, after fixing the cable and sensor assembly to the outer wall of the tubing, when the sensor needs to be maintained later, the tubing string needs to be removed, which is not only complicated, time-consuming and labor-intensive, but also expensive. Utility Model Content
[0005] This application provides a coalbed methane well monitoring device to solve the problems of complex operation, time-consuming and labor-intensive operation, and high cost of existing coalbed methane well monitoring devices during later maintenance.
[0006] This application provides a coalbed methane well monitoring device, including a cable, a sensor assembly, a ground data conversion and transmission device, and a hose;
[0007] The hose is a hollow structure with one open end, and the open end of the hose is sealed with an air pressure regulating device that can adjust the air pressure inside the hose.
[0008] The hose is connected to a pneumatic expansion structure that can simultaneously compress the tubing and casing of the coalbed methane well. When the internal air pressure of the hose increases, the pneumatic expansion structure extends; when the internal air pressure of the hose decreases, the pneumatic expansion structure shortens.
[0009] The sensor assembly is fixed to the lower part of the flexible tube;
[0010] The cable is located inside the hose and the air pressure regulator. One end of the cable extends out of the hose and connects to the sensor assembly, while the other end extends out of the air pressure regulator and connects to the ground data conversion and transmission device.
[0011] Optionally, the cylinder of the air pressure regulating device has its lower end connected and sealed to the open end of the hose. The cylinder is equipped with a piston inside, and a screw is rotatably connected to the upper end of the piston. The screw passes through the upper end of the cylinder and is threadedly connected to the upper end of the cylinder. A handwheel is fixed to the upper end of the screw.
[0012] Optionally, the pneumatic telescopic structure includes multiple sets of telescopic components distributed along the axial direction of the hose, and the telescopic component is composed of two corrugated telescopic tubes symmetrically distributed about the center line of the hose.
[0013] The corrugated expansion joint is connected to the flexible hose and sealed and fixed.
[0014] Optionally, when the hoses are vertically distributed and the corrugated expansion tubes are in a free state, the corrugated expansion tubes are horizontally distributed.
[0015] Optionally, a mounting base is fixed to the lower part of the hose, and the sensor assembly is mounted on the mounting base.
[0016] Optionally, the sensor assembly includes a pressure sensor, a temperature sensor, a flow sensor, and a level sensor.
[0017] The coalbed methane well monitoring device provided in this application comprises a flexible hose with one open end, connected to a pressure regulating device that adjusts the internal air pressure. The hose is also connected to a pressure-expanding structure that simultaneously compresses the tubing and casing of the coalbed methane well. When the internal air pressure increases, the pressure-expanding structure extends; when the internal air pressure decreases, the structure shortens. A sensor assembly is fixed to the lower part of the hose. A cable is located inside the hose and the pressure regulating device. One end of the cable extends out of the hose and connects to the sensor assembly, while the other end extends out of the pressure regulating device and connects to a surface data conversion and transmission device. In use, an eccentric wellhead is first installed on the well cover of the coalbed methane well. Then, the hose is lowered from the eccentric wellhead into the annular space of the coalbed methane well, and the pressure regulating device is fixed at the eccentric wellhead position. Simultaneously, the pressure regulating device closes the eccentric opening. Then, the pressure regulating device is operated to increase the internal pressure of the hose, causing the pressure-expanding structure to extend. The pressure-expanding structure then presses tightly against the tubing and casing, fixing the hose within the annular space of the coalbed methane well. This means fixing the sensor assembly and cable within the annular space of the coalbed methane well for data acquisition. When maintenance of the sensor assembly is required, simply operate the pressure regulating device to decrease the internal pressure of the hose, shortening the pressure-expanding structure, releasing the hose from its fixation, removing the pressure-expanding structure from the eccentric wellhead, and pulling the hose out of the annular space to maintain the sensor assembly. Compared to existing sensor assembly maintenance methods, this method eliminates the need to remove the tubing string; simply pulling out the hose is sufficient. This not only makes the operation more convenient, time-saving, and labor-saving but also reduces maintenance costs. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 A schematic diagram of the unsecured main structure of a hose entering a coalbed methane well;
[0020] Figure 2 A schematic diagram of a hose fixed inside a coalbed methane well;
[0021] Figure 3 for Figure 2 A magnified structural diagram of region A;
[0022] Figure 4 for Figure 2 A magnified structural diagram of region B;
[0023] Figure 5 This is a partial three-dimensional structural diagram of the coalbed methane well monitoring device provided in the embodiments of this application.
[0024] Explanation of reference numerals in the attached drawings: 1. Cable; 2. Sensor assembly; 3. Ground data conversion and transmission device; 4. Hoses; 5. Air pressure regulating device; 5. Cylinder; 51. Piston; 52. Screw; 53. Internal threaded sleeve; 54. Handwheel; 55. Annular plate; 56. Air pressure telescopic structure; 6. Telescopic assembly; 61. Corrugated telescopic pipe; 62. Mounting base; 7. Coalbed methane well; 8. Casing; 9. Oil pipe; 10. Well cover; 11. Eccentric wellhead; 12. Detailed Implementation
[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.
[0026] like Figures 1-5 As shown:
[0027] An embodiment of this application provides a coalbed methane well monitoring device, which includes a cable 1, a sensor assembly 2, a ground data conversion and transmission device 3, and a hose 4.
[0028] The hose 4 is a hollow structure with one end open. The open end of the hose 4 is sealed with an air pressure regulating device 5 that can adjust the air pressure inside the hose 4.
[0029] In this embodiment, the hose 4 is a PVC (polyvinyl chloride) hose, and the hose 4 is cylindrical in the free state.
[0030] The hose 4 is connected to a pneumatic expansion structure 6 that can simultaneously press the tubing 10 and casing 9 of the coalbed methane well 8. When the internal air pressure of the hose 4 increases, the pneumatic expansion structure 6 extends and simultaneously presses the outer wall of the tubing 10 and the inner wall of the casing 9. When the internal air pressure of the hose 4 decreases, the pneumatic expansion structure 6 shortens.
[0031] The sensor assembly 2 is fixed to the lower part of the hose 4.
[0032] Cable 1 is located inside hose 4 and air pressure regulating device 5, with a gap between cable 1 and hose 4 to ensure that the gas in hose 4 can smoothly enter the air pressure telescopic structure 6. One end of cable 1 extends out of hose 4 and connects to sensor assembly 2, while the other end of cable 1 extends out of air pressure regulating device 5 and connects to ground data conversion and transmission device 3.
[0033] In this embodiment, cable 1, sensor assembly 2, and ground data conversion and transmission device 3 are all existing technologies and will not be described in detail.
[0034] In this embodiment, an eccentric wellhead 12 is provided on the well cover 11 of the coalbed methane well 8, and the gas pressure regulating device 5 can be fixed at the position of the eccentric wellhead 12 by bolts and the eccentric wellhead is closed.
[0035] In use, first, the hose 4 is vertically lowered from the eccentric wellhead 12 into the annular space of the coalbed methane well 8. Then, the pressure regulating device 5 is fixed at the eccentric wellhead 12. Next, the pressure regulating device 5 is operated to increase the internal pressure of the hose 4, causing the pressure telescopic structure 6 to extend. The pressure telescopic structure 6 presses tightly against the outer wall of the tubing 10 and the inner wall of the casing 9, thus fixing the hose 4 in the annular space of the coalbed methane well 8. In other words, the sensor assembly 2 and the cable 1 are fixed in the annular space of the coalbed methane well 8. At this time, the sensor assembly 2 can collect data in the annular space and dynamically monitor the coalbed methane well 8.
[0036] When it is necessary to maintain sensor assembly 2, simply operate the air pressure regulating device 5 to reduce the air pressure inside the hose 4, shorten the air pressure telescopic structure 6, release the hose 4 from its fixation, remove the air pressure telescopic structure 6 from the eccentric wellhead 12, and pull the hose 4 out of the annular space to maintain sensor assembly 2. Compared with the existing maintenance method for sensor assembly 2, it is not necessary to pull up the tubing string 10 when maintaining sensor assembly 2; simply pull out the hose 4. This is not only convenient, time-saving, and labor-saving, but also reduces maintenance costs.
[0037] In addition, placing the cable 1 inside the flexible hose 4 provides a certain degree of protection for the cable 1. Furthermore, since both the cable 1 and the flexible hose 4 are flexible, the flexible hose 4 can be coiled into a loop during transportation and tied with ropes, cable ties, etc., which facilitates transportation.
[0038] In some embodiments of this application, the air pressure regulating device 5 has a cylinder 51. The lower end of the cylinder 51 is connected to the open end of the hose 4 and sealed and fixed by adhesive. The cylinder 51 has a piston 52 adapted to it inside. The upper end of the piston 52 is rotatably connected to a screw 53 through a bearing. The screw 53 passes through the upper end of the cylinder 51 and is threadedly connected to the upper end of the cylinder 51. Specifically, the upper end of the cylinder 51 has an internal threaded sleeve 54 that passes through the upper end of the cylinder 51. The screw 53 passes through the internal threaded sleeve 54 and is engaged with the internal threaded sleeve 54. A handwheel 55 is fixed to the upper end of the screw 53.
[0039] In this embodiment, an annular plate 56, integrally formed with the lower end of the cylinder 51, is fitted onto the lower end of the cylinder 51. The annular plate 56 is fixedly connected to the edge of the eccentric wellhead 12 by bolts. After the annular plate 56 is fixedly connected to the edge of the eccentric wellhead 12, the lower end of the cylinder 51 and the cylinder 51 seal the eccentric wellhead 12. The cable 1 extends from the hose 4 to the lower part of the cylinder 51, and extends out of the cylinder 51 from the lower part of the cylinder 51 and is sealed and fixedly connected to the cylinder 51 by adhesive.
[0040] In this embodiment, after the lower end of the handwheel 55 contacts the upper end of the internal threaded sleeve 54, the pneumatic telescopic structure 6 presses tightly against the outer wall of the oil pipe 10 and the inner wall of the sleeve 9, thereby making it easier for the staff to confirm whether the pneumatic telescopic structure 6 presses tightly against the oil pipe 10 and the sleeve 9.
[0041] In use, the operator manually turns the handwheel 55, which drives the screw 53 to rotate. Under the action of the internal threaded sleeve 54, the screw 53 moves up and down while rotating, and the screw 53 drives the piston 52 to move synchronously with it.
[0042] When piston 52 moves down, the gas in cylinder 51 is compressed into hose 4 by piston 52. The gas pressure inside hose 4 increases, and the gas pressure telescopic structure 6 extends. At the same time, the gas pressure telescopic structure 6 presses tightly against oil pipe 10 and casing 9, fixing hose 4 in the annular space of coalbed methane well 8.
[0043] When piston 52 moves upward, cylinder 51 draws in gas from hose 4. Some of the gas in hose 4 enters cylinder 51, reducing the air pressure in hose 4. The air pressure expansion structure 6 shortens, releasing hose 4 from its fixation in the annular space.
[0044] In some embodiments of this application, the pneumatic telescopic structure 6 includes multiple sets of telescopic components 61 distributed axially along the hose 4. Each telescopic component 61 consists of two corrugated telescopic tubes 62 symmetrically distributed about the centerline of the hose 4, such that one corrugated telescopic tube 62 presses tightly against the outer wall of the oil pipe 10, and the other corrugated telescopic tube 62 presses tightly against the outer wall of the sleeve 9.
[0045] The corrugated expansion tube 62 is connected to the hose 4 and sealed and fixed by adhesive.
[0046] In this embodiment, the corrugated expansion tube 62 is made of elastic rubber.
[0047] In use, when the internal air pressure of hose 4 increases, the gas inside hose 4 enters the corrugated telescopic tube 62, increasing the air pressure inside the corrugated telescopic tube 62. One side of the corrugated telescopic tube 62 extends to contact and press tightly against the outer wall of the oil pipe 10, while the other side of the corrugated telescopic tube 62 extends to contact and press tightly against the outer wall of the sleeve 9, thus fixing hose 4 inside the annular space. When the internal air pressure of hose 4 decreases, the gas inside the corrugated telescopic tube 62 enters hose 4, and the internal air pressure of the corrugated telescopic tube 62 also decreases. Under its elastic force, the corrugated telescopic tube 62 shortens and returns to its original position, thus releasing hose 4 from being fixed in the annular space.
[0048] In some embodiments of this application, when the hose 4 is vertically distributed and the corrugated telescopic tube 62 is in a free state, the corrugated telescopic tube 62 is horizontally distributed. After the hose 4 is placed vertically in the annular space, the corrugated telescopic tube 62 is horizontally distributed. After the air pressure inside the hose 4 increases, that is, after the air pressure inside the corrugated telescopic tube 62 increases, the corrugated telescopic tube 62 can smoothly extend in the horizontal direction to fix the hose 4.
[0049] In some embodiments of this application, a mounting base 7 is fixed to the lower part of the hose 4, and the mounting base 7 is located above the lowermost corrugated telescopic tube 62. The mounting base 7 is sleeved on the hose 4 and fixedly connected to the hose 4. The sensor assembly 2 can be detachably mounted on the mounting base 7, which facilitates the installation of the sensor assembly 2 on the hose 4.
[0050] In some embodiments of this application, sensor assembly 2 includes a pressure sensor, a temperature sensor, a flow sensor, and a liquid level sensor.
[0051] In this embodiment, the pressure sensor, temperature sensor, flow sensor, and level sensor are all connected to cable 1 via wires. All of these sensors are detachably mounted on mounting base 7. The pressure sensor, temperature sensor, flow sensor, and level sensor respectively collect temperature, pressure, flow rate, and level data within the coalbed methane well 8.
[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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 application.
Claims
1. A coalbed methane well monitoring device, comprising a cable (1), a sensor assembly (2), and a ground data conversion and transmission device (3), characterized in that: It also includes hoses (4); The hose (4) is a hollow structure with one end open. The open end of the hose (4) is sealed with an air pressure regulating device (5) that can adjust the air pressure inside the hose (4). The hose (4) is connected to a pneumatic expansion structure (6) that can simultaneously press the tubing and casing of the coalbed methane well. When the internal air pressure of the hose (4) increases, the pneumatic expansion structure (6) extends; when the internal air pressure of the hose (4) decreases, the pneumatic expansion structure (6) shortens. The sensor assembly (2) is fixed to the lower part of the flexible hose (4); The cable (1) is located inside the hose (4) and the air pressure regulating device (5). One end of the cable (1) extends out of the hose (4) and is connected to the sensor assembly (2). The other end of the cable (1) extends out of the air pressure regulating device (5) and is connected to the ground data conversion and transmission device (3).
2. The coalbed methane well monitoring device according to claim 1, characterized in that: The air pressure regulating device (5) has a cylinder (51). The lower end of the cylinder (51) is connected to the open end of the hose (4) and sealed and fixed. The cylinder (51) is equipped with a piston (52). The upper end of the piston (52) is rotatably connected to a screw (53). The screw (53) passes through the upper end of the cylinder (51) and is threadedly connected to the upper end of the cylinder (51). The upper end of the screw (53) is fixed with a handwheel (55).
3. The coalbed methane well monitoring device according to claim 1, characterized in that: The pneumatic telescopic structure (6) includes multiple sets of telescopic components (61) distributed along the axial direction of the hose (4). The telescopic components (61) are composed of two corrugated telescopic tubes (62) symmetrically distributed about the center line of the hose (4). The corrugated expansion tube (62) is connected to the hose (4) and sealed and fixed.
4. The coalbed methane well monitoring device according to claim 3, characterized in that: When the hose (4) is vertically distributed and the corrugated expansion tube (62) is in a free state, the corrugated expansion tube (62) is horizontally distributed.
5. The coalbed methane well monitoring device according to claim 1, characterized in that: The lower part of the hose (4) is fixed with a mounting base (7), and the sensor assembly (2) is mounted on the mounting base (7).
6. The coalbed methane well monitoring device according to claim 5, characterized in that: The sensor assembly (2) includes a pressure sensor, a temperature sensor, a flow sensor, and a liquid level sensor.