Coal mine underground while-drilling azimuth gamma measurement nipple and measurement system thereof

Abstract

The utility model provides a coal mine underground while-drilling azimuth gamma measuring pup joint and a measuring system thereof, the measuring pup joint is composed of an upper connecting unit, a lower connecting unit, a control unit, a gamma measuring unit and a shell, the two ends of the shell are respectively in threaded connection with the upper connecting unit and the lower connecting unit, and the sealing pressure bearing is realized through an O-shaped ring; the control unit and the gamma measurement unit are arranged in the shell; the utility model has the advantages of compact structure, good sealing performance, strong anti-seismic property, good shielding effect, reliable connection and the like, and provides a while-drilling azimuth gamma measurement nipple which is suitable for severe environment of an underground coal mine, and can be matched with a mining wired while-drilling measurement system or a mining wireless while-drilling measurement system; the geological section of the drill hole, the content of sandstone shale in the section, the permeability of the rock stratum and the distance between the drill hole and a coal seam top plate and a coal seam bottom plate are measured, and remarkable technical progress and practical application value are achieved.

Description

Technical Field

[0001] This utility model relates to the field of measurement while drilling technology, and in particular to a short section for measuring azimuth and gamma measurement in coal mines and its measurement system. Background Technology

[0002] In existing technologies, underground directional drilling measurement-while-drilling (MWD) systems in coal mines include two types: wired and wireless. Wired MWD systems typically use a borehole-end computer connected to a wired MWD probe at the bottom of the borehole via a dedicated cable drill rod, providing power and transmitting data. Specifically, the dip angle, azimuth angle, and tool face angle measured by the wired MWD probe are transmitted to the borehole-end computer via a wired connection and displayed in real time. Wireless MWD systems are powered by a wireless MWD probe at the bottom of the borehole with its own rechargeable power supply. They measure the dip angle, azimuth angle, and tool face angle according to certain rules and transmit the data wirelessly to the borehole-end computer via electromagnetic waves or mud pulses, displaying the data in real time. However, neither of these methods possesses a measuring instrument with azimuth gamma rays, making it impossible to determine the geological profile of the borehole, the sandstone and mudstone content within the profile, the permeability of the rock strata, or the distance to the coal seam roof and floor, thus limiting their application scope.

[0003] The petroleum industry has widely adopted and applied measurement-while-drilling (MWD) systems with azimuth gamma measurement capabilities. However, in coal mines, due to safety concerns, explosion-proof designs and coal mine safety certifications are required. Therefore, to better measure the MWD trajectory and acquire geological information for analysis and application in coal mines, it is necessary to invent a MWD sub with azimuth gamma measurement functionality. This sub can be used in conjunction with existing wired or wireless MWD systems. When needed, it can measure the borehole trajectory and obtain geological information such as borehole profile, sandstone mud content, rock permeability, and distances to the coal seam roof and floor. Utility Model Content

[0004] To address the lack of a drilling measurement sub with azimuth gamma measurement function in the existing technology, this utility model provides a coal mine downhole drilling azimuth gamma measurement sub.

[0005] This utility model provides a short sub for underground azimuth gamma measurement in coal mines and its measurement system, which adopts the following technical solution:

[0006] A short section for azimuth gamma measurement while drilling in coal mines consists of an upper connecting unit, a lower connecting unit, a control unit, a gamma measurement unit, and a housing. The two ends of the housing are threaded to the upper connecting unit and the lower connecting unit, respectively, and are sealed and pressure-bearing through O-rings. The control unit and the gamma measurement unit are located inside the housing.

[0007] The control unit includes a power board, a control board, and a frame shared with the gamma measurement unit. The frame is located inside the housing. Rectangular slots are formed on both sides of one end of the frame. The power board and the control board are respectively installed in the rectangular slots on both sides and fixed by four screws and nuts. Grooves are formed at both ends of the rectangular slots. Second O-rings are installed in the two grooves respectively. The frame is centrally located inside the housing through the second O-rings.

[0008] The gamma measurement unit includes a photomultiplier tube, a crystal, a shield, a plug, and a shock-absorbing pad. The other end of the frame has an inner hole in which the photomultiplier tube and the crystal are sequentially arranged. An open shield is fitted over the outer side of the frame. One end of the frame and the shield are connected by countersunk screws arranged in a circumferential array. The other end of the shield is fixedly connected to a plug by countersunk screws arranged in a circumferential array. A shock-absorbing pad is placed between the plug and the crystal. A groove is formed on the plug, and a second O-ring is installed in the groove. The plug is centrally located inside the housing via the second O-ring.

[0009] The upper connection unit includes an upper connector, a vibration damper, an aviation plug, and a spring wire. The left end of the housing is threaded with the upper connector and sealed with two first O-rings for pressure resistance. The vibration damper is disposed between the upper connector and the frame. The vibration damper contacts the upper connector and the frame through two semi-cylinders of equal diameter and is connected to the upper connector and the frame through two cylindrical head screws. The aviation plug is fixedly connected inside the upper connector. One end of the spring wire is welded to the output end of the aviation plug. The other end of the spring wire passes through the inner hole of the upper connector and the vibration damper and extends to the control unit, and is electrically connected to the power board and the control board respectively.

[0010] The lower connection unit includes a lower connector, a stabilizer, a socket sleeve, an aviation socket, and a pressure ring. The lower connector is threaded to the right end of the housing and is sealed and pressure-bearing through two first O-rings. The stabilizer is fixedly installed on the outer side wall of the lower connector. A stepped hole is opened inside the lower connector, and a socket sleeve is threaded into the stepped hole. An aviation socket is threaded into the center hole of the socket sleeve. The pressure ring is installed in the stepped hole of the lower connector and fixes the socket sleeve and the aviation socket together. A wire is welded to the aviation socket. The wire passes through the inner hole of the lower connector and leads to the control unit, and is electrically connected to the power board and the control board respectively.

[0011] Furthermore, the power board is equipped with a power module and a high-voltage module, and the control board is equipped with an MCU, an attitude measurement module and a storage module;

[0012] The power module is used to provide a stable voltage to the control board;

[0013] The high-voltage module is used to provide a stable high voltage for the photomultiplier tube;

[0014] The MCU is used to complete gamma signal acquisition and processing, gamma window position determination and communication control;

[0015] The attitude measurement module is used to measure the well inclination angle and tool face angle, and calculate the gamma window position;

[0016] The storage module is used to store data and parameters of the azimuth gamma measurement sub in coal mine drilling.

[0017] Furthermore, the shielding cover is made of tungsten alloy or lead alloy.

[0018] Furthermore, the shielding cover has an opening with an opening angle of M, where 55°≤M≤85°.

[0019] Furthermore, a wired measurement while drilling system includes a coal mine downhole azimuth gamma measurement sub, a wired transmission sub, and a wired trajectory measurement sub. The front end of the coal mine downhole azimuth gamma measurement sub is connected to the wired transmission sub, and the rear end of the coal mine downhole azimuth gamma measurement sub is connected to the wired trajectory measurement sub.

[0020] Furthermore, a wireless measurement while drilling system includes a coal mine downhole drilling azimuth gamma measurement sub, a wireless transmission sub, a battery sub, and a wireless trajectory measurement sub. One end of the wireless transmission sub is connected to one end of the battery sub, the other end of the battery sub is connected to one end of the coal mine downhole drilling azimuth gamma measurement sub, and the other end of the coal mine downhole drilling azimuth gamma measurement sub is connected to the wireless trajectory measurement sub.

[0021] In summary, the beneficial effects of this utility model are as follows:

[0022] This invention integrates a control unit, a gamma measurement unit, an upper connection unit, and a lower connection unit into a single housing, resulting in a compact and highly integrated structure that facilitates installation and use in the confined spaces of underground coal mines. The gamma measurement unit features an open-design shielding cover, effectively blocking external interference and improving the reliability of the measurement data. By combining the underground coal mine azimuth gamma measurement sub with a wired or wireless mine-use measurement-while-drilling system, it is possible to measure the geological profile of the borehole, the sandstone and mudstone content within the profile, the permeability of the rock strata, and the distances to the roof and floor of the coal seam. Attached Figure Description

[0023] Figure 1 This is a sectional view of the main view of the drilling azimuth gamma measurement short section of this utility model;

[0024] Figure 2 This is a top view of the drilling azimuth gamma measurement sub after removing the shell.

[0025] Figure 3 This is a three-dimensional schematic diagram of the drilling azimuth gamma measurement sub after removing the shell.

[0026] Figure 4 This is a cross-sectional view of the drilling azimuth gamma measurement sub AA of this utility model;

[0027] Figure 5 This is a schematic diagram of the in-hole instrument connection when the drilling azimuth gamma measurement sub of this utility model is used in conjunction with a wired drilling measurement system.

[0028] Figure 6 This is a schematic diagram of the in-hole instrument connection when the drilling azimuth gamma measurement sub of this utility model is used in conjunction with the wireless drilling measurement system.

[0029] As shown in the figure: 1-Aviation plug, 2-Spring wire, 3-Upper connector, 4-Vibration damper, 5-Power board, 6-Control board, 7-Frame, 8-Housing, 9-Photomultiplier tube, 10-Shielding cover, 11-Crystal, 12-Shock damping pad, 13-Plug, 14-Lower connector, 15-Center, 16-Socket sleeve, 17-Aviation socket, 18-Pressure ring, 19-First O-ring, 20-Second O-ring, 21-Gamma measurement sub for underground drilling in coal mines, 22-Wired transmission sub, 23-Wired trajectory measurement sub, 24-Wireless transmission sub, 25-Battery sub, 26-Wireless trajectory measurement sub. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1 -Appendix Figure 6 The present invention will be further described in detail below:

[0031] This utility model discloses a short section for azimuth gamma measurement while drilling in coal mines, such as... Figures 1-3 As shown, the present invention relates to a short section for measuring azimuth and gamma ray while drilling in coal mines, comprising an upper connecting unit, a lower connecting unit, a control unit, a gamma ray measuring unit, and a housing 8. The upper connecting unit and the housing 8, and the lower connecting unit and the housing 8 are all connected by threads and sealed with O-rings for pressure bearing. The control unit and the gamma ray measuring unit are installed on the frame 7 inside the housing 8. The short section for measuring azimuth and gamma ray while drilling conforms to the intrinsically safe design for underground coal mines.

[0032] The upper connection unit consists of an aviation plug 1, a spring wire 2, an upper connector 3, and a shock absorber 4. The upper connector 3 is connected to the housing 8 by threads and is sealed and pressure-bearing by two first O-rings 19. The upper connector 3 and the shock absorber 4 are in contact by two semi-cylinders of equal diameter and are connected by two cylindrical head screws. The aviation plug 1 is welded to the spring wire 2 and vulcanized to form a whole. The other end of the spring wire 2 passes through the inner hole of the upper connector 3 and the shock absorber 4 to the control unit and is electrically connected to the power board 5 and the control board 6 respectively.

[0033] The lower connection unit consists of an aviation socket 17, a socket sleeve 16, a pressure ring 18, a lower connector 14, and a stabilizer 15. The lower connector 14 is connected to the housing 8 by threads and is sealed and pressure-bearing by two first O-rings 19. The stabilizer 15 is installed on the lower connector 14. The aviation socket 17 is installed in the center hole of the socket sleeve 16 by threads. The socket sleeve 16 is installed in the stepped hole inside the lower connector 14 and is connected to the lower connector 14 by threads using the pressure ring 18, thus fixing the socket sleeve 16 together with the aviation socket 17. The aviation socket 17 is soldered with wires that are led through the inner hole of the lower connector 14 to the control unit and electrically connected to the power board 5 and the control board 6 respectively.

[0034] The control unit consists of a power board 5, a control board 6, and a frame 7 shared with the gamma measurement unit. The frame 7 contacts the damper 4 through two semi-cylinders of equal diameter and is connected by two cylindrical head screws. Rectangular slots are provided on both sides of one end of the frame 7. The power board 5 and the control board 6 are respectively installed in the rectangular slots on both sides and fixed with four screws and nuts. Grooves are provided at both ends of the rectangular slots, and a second O-ring 20 is installed in each to ensure that the frame 7 is located in the center of the housing 8.

[0035] The gamma measurement unit consists of a crystal 11, a photomultiplier tube 9, a shield 10, a shock-absorbing pad 12, a plug 13, and a frame 7 shared with the control unit. The photomultiplier tube 9 and the crystal 11 are sequentially installed in the inner hole of the other end of the frame 7, and the shield 10 with an opening is covered on the frame 7. The frame 7 and the shield 10 are connected by a ring of countersunk screws around the circumference. The other end of the shield 10 is also connected to the plug 13 by a ring of countersunk screws around the circumference. A shock-absorbing pad 12 is installed between the plug 13 and the crystal 11 to prevent damage to the crystal 11 from a hard connection. The plug 13 has a groove and a second O-ring 20 is installed to ensure that the plug 13 and the frame 7 are centered in the housing 8.

[0036] Preferably, the power board 5 is equipped with a power module, a high voltage module and supporting circuits, and the control board 6 is equipped with an MCU, an attitude measurement module, a storage module and control circuits.

[0037] The power module is used to provide a stable voltage for the control board 5;

[0038] The high-voltage module is used to provide a stable high voltage for the photomultiplier tube 6;

[0039] The MCU is used to complete gamma signal acquisition and processing, gamma window position determination, and communication control.

[0040] The attitude measurement module is used to measure the well inclination angle and tool face angle, and calculate the gamma window position;

[0041] The storage module is used to store the data and parameters of the azimuth gamma measurement sub in coal mine drilling.

[0042] like Figure 4 As shown, the shielding cover 10 is made of tungsten alloy or lead alloy and has an opening with an opening angle M = 55° to 85°.

[0043] like Figure 5 As shown, the coal mine underground drilling azimuth gamma measurement sub can be used in conjunction with a mine wired drilling measurement system: a wired drilling measurement system includes a coal mine underground drilling azimuth gamma measurement sub, a wired transmission sub 22, and a wired trajectory measurement sub 23. The front end of the coal mine underground drilling azimuth gamma measurement sub is connected to the wired transmission sub 22, and the rear end of the coal mine underground drilling azimuth gamma measurement sub is connected to the wired trajectory measurement sub 23.

[0044] like Figure 6 As shown, the coal mine underground drilling azimuth gamma measurement sub can be used in conjunction with a mining wireless drilling measurement system: A wireless drilling measurement system includes a coal mine underground drilling azimuth gamma measurement sub, a wireless transmission sub 24, a battery sub 25, and a wireless trajectory measurement sub 26. One end of the wireless transmission sub 24 is connected to one end of the battery sub 25, the other end of the battery sub 25 is connected to one end of the coal mine underground drilling azimuth gamma measurement sub, and the other end of the coal mine underground drilling azimuth gamma measurement sub is connected to the wireless trajectory measurement sub 26. Using this utility model's drilling azimuth gamma measurement sub, it can be used in conjunction with a mining wired drilling measurement system or a mining wireless drilling measurement system to measure the geological profile of the borehole, the sandstone mudstone content in the profile, the permeability of the rock strata, and the distance from the top and bottom of the coal seam.

[0045] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. The various components mentioned in this utility model are common technologies in the existing field. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A short section for azimuth gamma measurement while drilling in coal mines, comprising an upper connecting unit, a lower connecting unit, a control unit, a gamma measurement unit, and a housing (8), characterized in that: The two ends of the housing (8) are threaded to the upper connecting unit and the lower connecting unit respectively, and are sealed and pressure-bearing through O-rings. The control unit and the gamma measuring unit are located inside the housing (8). The control unit includes a power board (5), a control board (6), and a frame (7) shared with the gamma measurement unit. The frame (7) is located inside the housing (8). A rectangular groove is provided on both sides of one end of the frame (7). The power board (5) and the control board (6) are respectively installed in the rectangular grooves on both sides and fixed by four screws and nuts. A groove is provided at both ends of the rectangular groove. A second O-ring (20) is installed in each of the two grooves. The frame (7) is centrally located inside the housing (8) through the second O-ring (20). The gamma measurement unit includes a photomultiplier tube (9), a crystal (11), a shield (10), a plug (13), and a shock-absorbing pad (12). The other end of the frame (7) has an inner hole in which the photomultiplier tube (9) and the crystal (11) are arranged in sequence. The outer side of the frame (7) is fitted with a shield (10) with an opening. The frame (7) and one end of the shield (10) are connected by countersunk screws distributed in a circumferential array. The other end of the shield (10) is fixedly connected to the plug (13) by countersunk screws distributed in a circumferential array. A shock-absorbing pad (12) is arranged between the plug (13) and the crystal (11). The plug (13) has a groove in which a second O-ring (20) is installed. The plug (13) is centrally located inside the housing (8) through the second O-ring (20). The upper connection unit includes an upper connector (3), a shock absorber (4), an aviation plug (1), and a spring wire (2). The left end of the housing (8) is threaded with the upper connector (3) and sealed and pressure-bearing by two first O-rings (19). The shock absorber (4) is located between the upper connector (3) and the frame (7). The shock absorber (4) contacts the upper connector (3) and the frame (7) respectively through two semi-cylinders of equal diameter, and is connected to the upper connector (3) and the frame (7) respectively through two cylindrical head screws. The aviation plug (1) is fixedly connected inside the upper connector (3). One end of the spring wire (2) is welded to the output end of the aviation plug (1). The other end of the spring wire (2) extends through the inner hole of the upper connector (3) and the shock absorber (4) to the control unit and is electrically connected to the power board (5) and the control board (6) respectively. The lower connection unit includes a lower connector (14), a stabilizer (15), a socket sleeve (16), an aviation socket (17), and a pressure ring (18). The lower connector (14) is threaded to the right end of the housing (8) and is sealed and pressure-bearing through two first O-rings (19). The stabilizer (15) is fixedly installed on the outer side wall of the lower connector (14). A stepped hole is opened inside the lower connector (14), and the socket sleeve (16) is threaded inside the stepped hole. The aviation socket (17) is threaded inside the center hole of the socket sleeve (16). The pressure ring (18) is installed in the stepped hole of the lower connector (14) and fixes the socket sleeve (16) and the aviation socket (17) together. The aviation socket (17) is welded with a wire, which passes through the inner hole of the lower connector (14) to the control unit and is electrically connected to the power board (5) and the control board (6) respectively.

2. The short sub for azimuth gamma measurement in coal mines under drilling as described in claim 1, characterized in that: The power board (5) is equipped with a power module and a high voltage module, and the control board (6) is equipped with an MCU, an attitude measurement module and a storage module; The power module is used to provide a stable voltage to the control board (6); The high-voltage module is used to provide a stable high voltage for the photomultiplier tube (9); The MCU is used to complete gamma signal acquisition and processing, gamma window position determination and communication control; The attitude measurement module is used to measure the well inclination angle and tool face angle, and calculate the gamma window position; The storage module is used to store data and parameters of the azimuth gamma measurement sub in coal mine drilling.

3. The short sub for azimuth gamma measurement in coal mines under drilling as described in claim 1, characterized in that: The shield (10) is made of tungsten alloy or lead alloy.

4. The short sub for azimuth gamma measurement in coal mines under drilling as described in claim 1, characterized in that: The shield (10) has an opening with an opening angle of M, 55°≤M≤85°.

5. A wired measurement-while-drilling system, characterized in that: Includes the coal mine downhole azimuth gamma measurement sub, wired transmission sub (22), and wired trajectory measurement sub (23) as described in any one of claims 1-4, wherein the front end of the coal mine downhole azimuth gamma measurement sub is connected to the wired transmission sub (22), and the rear end of the coal mine downhole azimuth gamma measurement sub is connected to the wired trajectory measurement sub (23).

6. A wireless measurement-while-drilling system, characterized in that: Includes the coal mine downhole drilling azimuth gamma measurement sub, wireless transmission sub (24), battery sub (25), and wireless trajectory measurement sub (26) as described in any one of claims 1-4, wherein one end of the wireless transmission sub (24) is connected to one end of the battery sub (25), the other end of the battery sub (25) is connected to one end of the coal mine downhole drilling azimuth gamma measurement sub, and the other end of the coal mine downhole drilling azimuth gamma measurement sub is connected to the wireless trajectory measurement sub (26).

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