Small-size downhole pressure gauge system for middle-deep coal bed gas
By designing a small-size downhole pressure gauge system and adopting a direct-reading pressure gauge and a protective component fixing structure, the problem of real-time monitoring of downhole pressure in medium-deep coalbed methane has been solved, and stable transmission of cables in deep well environments and cost savings have been achieved.
Patent Information
- Application Number
- CN202423012927.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-06
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2034-12-06
AI Technical Summary
Existing medium-deep coalbed methane mining cannot achieve real-time monitoring of downhole pressure, and the existing storage pressure gauge system is expensive and cannot meet the needs of real-time monitoring of downhole pressure.
A small-sized downhole pressure gauge system was designed. It uses a direct-reading pressure gauge, which is fixed by a bracket and a protective piece. A fixing piece with a large friction coefficient is used to rotate and clamp on the surface of the pipe. The contact diameter between the protective piece and the connecting piece surface is smaller than the specified diameter. The hole and groove design alleviates thermal expansion and contraction to ensure that the cable will not loosen or be damaged in deep well environments.
It achieves stable cable transmission in deep well environments, reduces the risk of cable damage, meets the real-time monitoring needs of medium and deep coalbed methane wells, and saves costs.
Smart Images
Figure CN223359098U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of logging cable protection, in particular to a small-sized downhole pressure gauge system for medium-deep coalbed methane. Background Art
[0002] Coalbed methane refers to hydrocarbon gas with methane as the main component that exists in coal seams. It is an unconventional natural gas and a high-quality energy and chemical raw material. my country is rich in coalbed methane resources and has huge potential for exploration and development. It is mainly concentrated in North China and Northwest China and parts of South and Northeast China. The existing shallow coalbed methane has been almost mined, and the development of deeper coalbed methane has become the main direction now. In order to solve the shortcomings of existing technologies, domestic companies have begun to develop small-sized downhole pressure gauge systems with independent intellectual property rights. The existing medium and deep coalbed methane mining is all small annular horizontal wells. In the past, storage-type pressure gauges were used to collect and store data, and then they were pulled out through well repair operations at fixed times. Not only is the cost very high, but it also cannot meet the working requirements of real-time monitoring of downhole pressure in coalbed methane wells. Therefore, some improvements are needed.
[0003] Therefore, it is necessary to design a small-sized downhole pressure gauge system for medium and deep coalbed methane with strong practicality, smaller diameter and wider adaptability. Utility Model Content
[0004] The purpose of the utility model is to provide a small-sized downhole pressure gauge system for medium-deep coalbed methane, so as to solve the problems raised in the above-mentioned background technology.
[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a small-size downhole pressure gauge system for medium and deep coalbed methane, including a connecting piece, pipe fittings are provided on both sides of the connecting piece, one of the pipe fittings is provided with a support tube on the surface, a pressure gauge is provided inside the support tube, a cable is provided at one end of the pressure gauge, a protective piece is provided on the surface of the pipe fitting, a fixing piece is provided on one side of the protective piece, and the protective piece covers the contact surface between the cable and the connecting piece.
[0006] According to the above technical solution, the pressure gauge is a direct-reading pressure gauge.
[0007] According to the above technical solution, there is a pair of brackets and they are adapted to the positions of the protective members.
[0008] According to the above technical solution, there is a pair of fixing members, which are respectively distributed at both ends of the connecting member and are symmetrical.
[0009] According to the above technical solution, holes and grooves are provided on the surface of the fixing member.
[0010] According to the above technical solution, there is a pair of fixing members that are rotationally connected to one side of the protective member, wherein the friction coefficient at the rotational connection between the fixing member and the protective member is large.
[0011] Compared with the prior art, the beneficial effects achieved by the present invention are:
[0012] (1) By providing a protective part, the direct-reading pressure gauge is fixed by two brackets, which can ensure that it will not loosen at any time even if vibration occurs in a deep well environment, and can stably transmit signals to the ground through the cable. However, due to the work in a deep well environment, the pipes need to be connected through connectors one by one. When the cable extends to the ground, it will contact the position of the connector and the protrusions on the surface. As the pipes are raised and lowered, collisions and vibrations will occur, which will generate squeezing force on the contact point between the cable and the connector, causing damage to the cable and exposing the internal circuit, resulting in the cable losing its transmission function. Therefore, a protective part is needed to press the cable on the surface of the connector. When the pipe vibrates, it can no longer continuously impact the cable surface. Since this system structure is adapted to medium-deep coalbed methane drilling work, it means that the aperture of the hole under the pipe must be smaller than the aperture of shallow mining in normal times to save costs. The maximum diameter of the contact between the protective part and the connecting part surface must be limited to comply with regulations. The protective part reduces its diameter and is rotated and clamped on the pipe surface by two symmetrical fixing parts. The high friction force ensures the fixing effect while the protective part and the fixing part are clamped on the surface of the connecting part without increasing the maximum diameter. The hole and groove design can alleviate the thermal expansion and contraction of the fixing part in the deep well environment, making the structure more stable. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a three-dimensional structural diagram of the utility model;
[0014] Figure 2 It is a schematic diagram of the cable position of the utility model;
[0015] In the figure: 1. Pipe fitting; 2. Bracket; 3. Pressure gauge; 4. Cable; 5. Connector; 6. Protective part; 7. Fixing part; 8. Hole groove. DETAILED DESCRIPTION
[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0017] See also Figure 1-2The utility model provides a technical solution: a small-size downhole pressure gauge system for medium and deep coalbed methane, including a connecting piece 5, with pipe fittings 1 provided on both sides of the connecting piece 5, a bracket 2 provided on the surface of one of the pipe fittings 1, a pressure gauge 3 provided inside the bracket 2, a cable 4 provided at one end of the pressure gauge 3, a protective piece 6 provided on the surface of the pipe fitting 1, a fixing piece 7 provided on one side of the protective piece 6, the protective piece 6 covers the contact surface between the cable 4 and the connecting piece 5, the pressure gauge 3 is a direct-reading pressure gauge, the bracket 2 has a pair and is adapted to the position of the protective piece 6, the fixing piece 7 has a pair, which are respectively distributed at both ends of the connecting piece 5 and are symmetrical, the fixing piece 7 has a hole groove 8 provided on the surface, the fixing piece 7 has a pair and is rotatably connected to one side of the protective piece 6, wherein the friction coefficient at the rotating connection between the fixing piece 7 and the protective piece 6 is large.
[0018] Specifically, the direct-reading pressure gauge 3 is fixed by two brackets 2, and it can be guaranteed not to loosen at any time even if vibration occurs in a deep well environment, and can stably transmit signals to the ground through the cable 4. Since it works in a deep well environment, the pipes 1 need to be connected through connectors 5 one by one. When the cable 4 extends to the ground, it will contact the position of the connector 5 and the protrusions on the surface. As the pipe 1 is raised and lowered, it will collide and vibrate, which will generate an extrusion force on the contact point between the cable 4 and the connector, causing the cable 4 to be damaged, exposing the internal circuit and losing the transmission function. Therefore, a protective member 6 is required to press the cable 4 on the surface of the connector 5, so that the pipe 1 can no longer continuously impact the surface of the cable 4 when vibrating. However, since this system structure is adapted to medium-deep coalbed methane drilling work, it means that the aperture of the hole under the pipe 1 should be smaller than the aperture of shallow mining in normal times to save costs. The maximum diameter of the contact between the protective part 6 and the connecting part 5 surface should be limited. The connection between the protective part 6 and the connecting part 5 in the system is 104mm, which meets the regulations. The protective part 6 reduces its diameter and is rotated and clamped on the surface of the pipe 1 through two symmetrical fixing parts 7. The large friction force ensures the fixing effect while the protective part 6 and the fixing part 7 are clamped on the surface of the connecting part 5 without increasing the maximum diameter. In addition, the design of the hole groove 8 can alleviate the thermal expansion and contraction of the fixing part 7 in the deep well environment, making the structure more stable.
[0019] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.
Claims
1. A small-sized downhole pressure gauge system for medium-deep coalbed methane, comprising a connector (5), characterized in that: Pipe fittings (1) are provided on both sides of the connecting piece (5), a support tube (2) is provided on the surface of one of the pipe fittings (1), a pressure gauge (3) is provided inside the support tube (2), a cable (4) is provided at one end of the pressure gauge (3), a protective piece (6) is provided on the surface of the pipe fitting (1), a fixing piece (7) is provided on one side of the protective piece (6), and the protective piece (6) covers the contact surface between the cable (4) and the connecting piece (5).
2. The small-sized downhole pressure gauge system for medium-deep coalbed methane according to claim 1 is characterized in that: The pressure gauge (3) is a direct-reading pressure gauge.
3. The small-sized downhole pressure gauge system for medium-deep coalbed methane according to claim 2 is characterized in that: The brackets (2) are provided in a pair and are adapted to the positions of the protective members (6).
4. The small-sized downhole pressure gauge system for medium-deep coalbed methane according to claim 1 is characterized in that: There is a pair of fixing members (7), which are respectively distributed at both ends of the connecting member (5) and are symmetrical.
5. The small-sized downhole pressure gauge system for medium-deep coalbed methane according to claim 4 is characterized in that: The surface of the fixing member (7) is provided with a hole groove (8).
6. The small-sized downhole pressure gauge system for medium-deep coalbed methane according to claim 1 is characterized in that: The fixing members (7) are in pair and are rotatably connected to one side of the protection member (6), wherein the friction coefficient at the rotatable connection between the fixing members (7) and the protection member (6) is large.