Methane content measuring device for coal bed gas exploration

Abstract

The invention relates to the technical field of coal bed gas exploration, and discloses a methane content measuring device for coal bed gas exploration, which comprises a ring sleeve in threaded connection outside a sonic probe main body, supporting seats are uniformly arranged on the outer edge of the ring sleeve in the circumferential direction, limiting mechanisms are movably mounted in the supporting seats, and ball heads of the limiting mechanisms are matched with ball sockets of the supporting seats. A limiting base is fixed to the ball head through a connecting rod, the connecting rod is sleeved with a spring, the two ends of the spring abut against the end face of the supporting base and the end face of the limiting base respectively, and a ball is movably installed at the free end of the limiting base. According to the device, the sonic probe main body is prevented from being in direct contact with a foreign object, so that hard collision to the sonic probe main body is prevented, meanwhile, in the process of being in contact with a well wall, the device can rotate in different directions and can move along with the sonic probe main body, and friction force is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of coalbed methane exploration, and in particular to groundwater monitoring, specifically to a methane content measuring device for coalbed methane exploration. Background Art

[0002] Coalbed gas, also known as coal-bed methane, is a mixed gas composed of methane, carbon dioxide and nitrogen that escapes from coal and surrounding rocks.

[0003] In order to facilitate accurate exploitation of coalbed methane, it is necessary to measure the methane content in the coalbed methane in advance. Conventional coalbed methane exploration methods mainly include geological exploration, geophysical exploration and gasification experiments.

[0004] Geological exploration is one of the most commonly used exploration methods: it is mainly carried out through field investigation and the collection of mine data. Through geological exploration, information on the distribution of coalbed methane resources, coal seam stratigraphic structure, coal seam thickness, coal seam porosity, etc. can be obtained. Geological exploration mainly includes geological measurement, geological drilling and the preparation of geological profiles.

[0005] Geophysical exploration is the use of geophysical methods to detect the distribution and properties of coalbed methane resources. Geophysical exploration mainly includes seismic exploration and well logging exploration. Seismic exploration is the detection of underground structures through seismic waves, which can obtain information about the conditions and distribution patterns of coalbed methane accumulation. Well logging exploration is to understand the distribution and reserves of coalbed methane by measuring the physical properties of underground rocks. Commonly used well logging methods include resistivity logging, acoustic logging and natural potential logging.

[0006] Geophysical exploration is the use of geophysical methods to detect the distribution and properties of coalbed methane resources. Geophysical exploration mainly includes seismic exploration and well logging exploration. Seismic exploration is the detection of underground structures through seismic waves, which can obtain information about the conditions and distribution patterns of coalbed methane accumulation. Well logging exploration is to understand the distribution and reserves of coalbed methane by measuring the physical properties of underground rocks. Commonly used well logging methods include resistivity logging, acoustic logging and natural potential logging.

[0007] However, when the existing logging probe is used in the well, it is easy to cause unnecessary damage to the probe when it comes into contact with the surface of the probe due to the lack of any buffer structure on the probe surface. Therefore, it is very necessary to invent a methane content measuring device for coalbed methane exploration. Summary of the invention

[0008] In order to solve the problem that the probe surface collides with the well wall during the underground use of the current well logging exploration probe, thus causing unnecessary damage to the probe, the present invention provides a methane content measuring device for coalbed methane exploration.

[0009] The present invention is implemented by the following technical solutions: A methane content measuring device for coalbed methane exploration comprises a ring sleeve threadedly connected to the outside of an acoustic wave probe body, support seats are evenly arranged circumferentially on the outer edge of the ring sleeve, a limiting mechanism is movably installed in the support seat, a ball head of the limiting mechanism cooperates with a ball socket of the support seat, the ball head is fixed to the limiting seat by a connecting rod, a spring is outerly disposed on the connecting rod, two ends of the spring are respectively mounted on the end faces of the support seat and the limit seat, and a sphere is movably installed on the free end of the limit seat.

[0010] During implementation, the invention comprises a ring sleeve threadedly connected to the outside of the acoustic wave probe body, which can prevent the acoustic wave probe body from directly contacting the well wall after the acoustic wave probe body enters the well, and the upper, middle and lower parts of the outer periphery of the acoustic wave probe body are respectively provided with external threads, the lower part of the outer periphery of the acoustic wave probe body is provided with a first external thread, the middle part is provided with a second external thread, and the middle part is provided with a third external thread; the inner wall of the ring sleeve is provided with an internal thread matched with the external thread, the first ring sleeve is installed on the first external thread, the second ring sleeve is installed on the second external thread, and the third ring sleeve is installed on the third external thread, so that the acoustic wave probe body and the ring sleeve can be easily disassembled and assembled; through the multi-position sleeve replacement design, the stability of the measurement can be guaranteed, and at the same time, various positions of the acoustic wave probe can be protected from damage; Support seats are evenly arranged along the circumference of the outer edge of the ring sleeve, and buffer recesses are provided on the ring sleeve to provide a buffer space for the limiting mechanism. A support seat is fixed at each buffer recess, and the support seat completely covers the buffer space. The first ball socket of the support seat is connected to the buffer space, providing the ball head with a moving space along the length direction of the connecting rod in addition to rotation. When the spring is fully compressed, the edge of the ball head contacts the surface of the buffer recess; when the spring is stretched, the ball head rests on the inner edge of the limiting hole to achieve the reset of the limiting mechanism on the side that is not in contact with the well wall, thereby avoiding the detachment of the limiting mechanism. The outer diameter of the connecting rod is smaller than the aperture of the limiting hole, and the aperture of the limiting hole is smaller than the outer diameter of the ball head. The ball head extends out of the limiting hole of the support seat through the connecting rod; The limiting mechanism is movably installed in the support seat, that is, the limiting mechanism includes a ball head, a connecting rod, and a limiting seat that are integrally connected. The ball head of the limiting mechanism cooperates with the ball socket of the supporting seat, and the ball head is fixed to the limited seat through the connecting rod, that is, one end of the connecting rod is fixed to the limited seat, and the other end is fixed with the ball head. The connecting rod is covered with a spring, and the two ends of the spring are respectively mounted on the end faces of the supporting seat and the limiting seat. In order to facilitate the rotation of the limiting mechanism, the two ends of the spring are not fixed to the supporting seat and the limiting seat. A ball is movably installed on the free end of the limiting seat, and a second ball socket is opened on the limiting seat, and a ball is movably installed in the second ball socket; the ball rotates universally in the second ball socket. During the contact process between the measuring device and the well wall, when friction occurs along the well depth direction, the ball converts the sliding friction into rotational friction, thereby reducing the friction force. At the same time, it can improve the flexibility of the overall movement, improve the smoothness of the overall movement, prevent the surface of the acoustic wave probe body from being scratched, and reduce the damage to the acoustic wave probe body. At the same time, it can also effectively avoid bending and damage of the connecting rod.

[0011] When in use, first screw the second ring sleeve onto the second external thread in the middle of the sonic probe body, and then screw the first ring sleeve and the third ring sleeve in the same way, and the device is installed.

[0012] The main body of the sonic probe is slowly inserted into the well. During the descent, when it contacts the surface of the well wall and causes a hard bump, the ball squeezes the second ball socket inward, pushing the limit seat to shrink inward. At this time, the edge of the limit seat squeezes the spring, and the spring shrinks, converting the collision kinetic energy into elastic potential energy. At the same time, the limit mechanism moves into the first ball socket, that is, the ball head moves toward the buffer depression, further playing a buffering role to prevent the probe from directly bumping against the well wall.

[0013] In another case, during the descent, the detection device slides down along the well wall, and the ball rotates universally in the second ball socket. When friction occurs along the depth direction of the well, the ball converts sliding friction into rotational friction, reducing friction, improving smoothness during movement, and preventing scratches on the surface of the limit mechanism. When replacement is needed, only the worn ball needs to be replaced to reduce losses.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The methane content measuring device for coalbed methane exploration provided by the present invention can protect the main body of the acoustic wave probe when it contacts with foreign objects or the well wall during use in the well, thereby preventing the main body of the acoustic wave probe from directly contacting with foreign objects, thereby preventing hard bumps on the main body of the acoustic wave probe. At the same time, in the process of contacting with the well wall, it can not only rotate in different directions, but also move with the main body of the acoustic wave probe and reduce friction, thereby ensuring the stability and smoothness of the main body of the acoustic wave probe during movement, thereby preventing scratches on the surface of the main body of the acoustic wave probe. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram showing the overall structure of the present invention.

[0016] Figure 2 An exploded view showing the present invention.

[0017] Figure 3 A schematic diagram showing the installation of the limiting mechanism of the present invention.

[0018] In the figure: 1-sonic wave probe body, 2-external thread, 201-first external thread, 202-second external thread, 203-third external thread, 3-ring sleeve, 301-first ring sleeve, 302-second ring sleeve, 303-third ring sleeve, 4-spring, 5-support seat, 501-first ball socket, 502-limiting hole, 6-limiting mechanism, 601-connecting rod, 602-limiting seat, 603-ball head, 604-second ball socket, 7-sphere. DETAILED DESCRIPTION

[0019] The specific embodiments of the present invention are described below in conjunction with the accompanying drawings.

[0020] A methane content measuring device for coalbed methane exploration, such as Figures 1 to 3 As shown: it includes a ring sleeve 3 threadedly connected to the outside of the sonic probe body 1, which can prevent the sonic probe body 1 from directly contacting the well wall after the sonic probe body 1 enters the well. The upper, middle and lower parts of the outer periphery of the sonic probe body 1 are respectively provided with external threads 2, the lower part of the outer periphery of the sonic probe body 1 is provided with a first external thread 201, the middle part is provided with a second external thread 202, and the middle part is provided with a third external thread 203; the inner wall of the ring sleeve 3 is provided with an internal thread matching the external thread 2, the first external thread 201 is installed with a first ring sleeve 301, the second external thread 202 is installed with a second ring sleeve 302, and the third external thread 203 is installed with a third ring sleeve 303, which is convenient for disassembly and assembly between the sonic probe body 1 and the ring sleeve 3; through the multi-position sleeve replacement design, the stability of the measurement can be guaranteed, and at the same time, various positions of the sonic probe are protected from damage; Support seats 5 are evenly arranged along the circumference of the outer edge of the ring sleeve 3, and buffer recesses are provided on the ring sleeve 3 to provide buffer space for the limiting mechanism 6. A support seat 5 is fixed at each buffer recess, and the support seat 5 completely covers the buffer space. The first ball socket 501 of the support seat 5 is connected to the buffer space, providing the ball head 603 with a moving space along the length direction of the connecting rod except for rotation. When the spring 4 is fully compressed, the edge of the ball head 603 contacts the surface of the buffer recess; when the spring is stretched, the ball head 603 rests on the inner edge of the limiting hole 502 to achieve the reset of the limiting mechanism 6 on the side that is not in contact with the well wall, and avoid the limiting mechanism 6 from disengaging. The outer diameter of the connecting rod 601 is smaller than the aperture of the limiting hole 502, and the aperture of the limiting hole 502 is smaller than the outer diameter of the ball head 603. The ball head 603 extends from the limiting hole 502 of the support seat 5 through the connecting rod 601; A limiting mechanism 6 is movably installed in the support seat 5, that is, the limiting mechanism 6 includes a ball head 603, a connecting rod 601, and a limiting seat 602 that are integrally connected. The ball head 603 of the limiting mechanism 6 cooperates with the ball socket of the support seat 5, and the ball head 603 is fixed to the limiting seat 602 through the connecting rod 601, that is, one end of the connecting rod 601 is fixed to the limiting seat 602, and the other end is fixed with the ball head 603. The connecting rod 601 is covered with a spring 4, and the two ends of the spring 4 are respectively mounted on the end faces of the support seat 5 and the limiting seat 602. In order to facilitate the rotation of the limiting mechanism 6, the two ends of the spring are not fixed to the support seat 5 and the limiting seat 602 A ball 7 is movably mounted on the free end of the limit seat 602, and a second ball socket 604 is formed on the limit seat 602, in which the ball 7 is movably mounted; the ball 7 is universally rotatable in the second ball socket 604, and when friction occurs along the depth direction of the well during contact between the measuring device and the well wall, the ball 7 converts the sliding friction into rotational friction, thereby reducing the friction force, and at the same time improving the flexibility and smoothness of the overall movement, thereby preventing the surface of the acoustic wave probe body 1 from being scratched, and reducing the damage to the acoustic wave probe body 1, and at the same time, effectively preventing the connecting rod 601 from being bent and damaged.

[0021] When in use, first screw the second ring sleeve 302 onto the second external thread in the middle of the sonic probe body 1, and then screw the first ring sleeve 301 and the third ring sleeve 303 in the same way, and the device is installed.

[0022] The sonic probe body 1 is slowly lowered into the well. During the descent, when it contacts the well wall surface and causes a hard bump, the ball 7 presses the second ball socket 604 inward, pushing the limit seat 602 to shrink inward. At this time, the edge of the limit seat 602 squeezes the spring 4, and the spring 4 shrinks, converting the collision kinetic energy into elastic potential energy. At the same time, the limit mechanism 6 moves into the first ball socket 501, that is, the ball head moves toward the buffering recess, further playing a buffering role to prevent the probe from directly bumping against the well wall.

[0023] As another case, during the descent process, the detection device slides down along the well wall, and the ball 7 rotates universally in the second ball socket 604. When friction occurs along the depth direction of the well, the ball 7 converts sliding friction into rotational friction, reducing friction, improving smoothness during movement, and preventing scratches on the surface of the limiting mechanism 6. When replacement is needed, only the worn ball needs to be replaced, reducing losses.

[0024] The scope of protection claimed by the present invention is not limited to the above specific embodiments. For those skilled in the art, the present invention may have various deformations and changes. Any modifications, improvements and equivalent substitutions made within the concept and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A methane content measuring device for coalbed methane exploration, characterized in that: The invention comprises a ring sleeve (3) which is threadedly connected to the outside of a sonic wave probe body (1); a support seat (5) is evenly arranged on the outer edge of the ring sleeve (3) in the circumferential direction; a limit mechanism (6) is movably installed in the support seat (5); a ball head (603) of the limit mechanism (6) cooperates with a ball socket of the support seat (5); the ball head (603) is fixed to the limit seat (602) via a connecting rod (601); a spring (4) is sheathed on the connecting rod (601); two ends of the spring (4) are respectively mounted on the end surfaces of the support seat (5) and the limit seat (602); a sphere (7) is movably installed on the free end of the limit seat (602).

2. The methane content measuring device for coalbed methane exploration according to claim 1 is characterized in that: The upper, middle and lower parts of the outer circumference of the sonic probe body (1) are respectively provided with external threads (2), and the inner wall of the ring sleeve (3) is provided with internal threads matching the external threads (2).

3. The methane content measuring device for coalbed methane exploration according to claim 1 is characterized in that: The limiting mechanism (6) comprises a ball head (603), a connecting rod (601), and a limiting seat (602) which are integrally connected. The limiting seat (602) is fixed at one end of the connecting rod (601), and the ball head (603) is fixed at the other end. The ball head (603) extends from the limiting hole (502) of the support seat (5) through the connecting rod (601).

4. The methane content measuring device for coalbed methane exploration according to claim 1 is characterized in that: The ring sleeve (3) is provided with a buffer recess, and a support seat (5) is fixed to each buffer recess. When the spring (4) is fully compressed, the edge of the ball head (603) contacts the surface of the buffer recess; when the spring is stretched, the ball head (603) rests on the inner edge of the limiting hole (502).

5. The methane content measuring device for coalbed methane exploration according to claim 2 is characterized in that: The lower part of the outer circumference of the sonic probe body (1) is provided with a first external thread (201), the middle part is provided with a second external thread (202), and the middle part is provided with a third external thread (203); a first ring sleeve (301) is mounted on the first external thread (201), a second ring sleeve (302) is mounted on the second external thread (202), and a third ring sleeve (303) is mounted on the third external thread (203).

6. The methane content measuring device for coalbed methane exploration according to claim 1 is characterized in that: The limiting seat (602) is provided with a second ball socket (604), and a ball (7) is movably mounted in the second ball socket (604).

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