Knocking type pipe lowering device in underground coal mine drill hole
The inner knocking type lower pipe device of the coal mine drilling hole uses the torque and high-pressure pushing force of the drill rod to drive the upper knocking hammer to rotate, and the transmission bump engages the isolation casing of the lower knocking hammer to hit the hole, solving the problem that the drill rod is difficult to penetrate in the complex geological layer and improving the drilling efficiency.
Patent Information
- Application Number
- CN202422565761.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-23
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-10-23
AI Technical Summary
During the drilling process of underground drilling of coal mines, it is difficult for the drilling rod to penetrate deep into the hard and complex blocked hole sections, and the existing casing is difficult to provide sufficient drilling support, resulting in inefficient drilling.
A type of internal knock-in pipe device for drilling underground in coal mines is designed to provide torque and high-pressure pushing force through the rotation of the drill rod, which drives the upper knock-in hammer to rotate, and drives the transmission bump to engage and drives the isolation sleeve inside the lower knock-in hammer to knock-in hole, so that it can enter the blocked hole section, and provide continuous knock-in force by using the micro-bending and reset of the drill rod.
It improves drilling efficiency, adapts to drilling needs under different geological conditions, and enhances the penetration ability of drilling rods in complex geological layers.
Smart Images
Figure CN223164476U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of downhole drilling equipment, and more specifically, the utility model relates to a percussion type pipe placer in a coal mine downhole borehole. Background Technique
[0002] Coal is the most important solid fuel, which is formed by the gradual accumulation of ancient lush plants in a suitable geological environment into thick layers and buried under water or sediment, and through the natural coalification process of a long geological age. Coal mines can be divided into underground coal mines and surface coal mines according to different mining methods.
[0003] During the underground operation of coal mines, drilling is an essential part. Through drilling, geological information of coal seams can be obtained, providing a scientific basis for coal mine mining design, ensuring the rationality and safety of mining plans. At the same time, harmful gases such as gas often exist in coal mine underground. Drilling can be used for gas drainage, releasing or pumping the gas in the coal seam to the ground for treatment in advance, effectively reducing the gas pressure in the coal seam and reducing the risk of gas outburst during the mining process, ensuring the safe production of coal mines.
[0004] When drilling underground, the drilling machine will drive the drill pipe to rotate to achieve drilling. However, with the continuous penetration of the drill pipe, the end of the drill pipe will contact the fault area. The geological structure in this area is complex, the rocks are broken, it is difficult for the drill pipe to continue to penetrate, and the wear of the drill pipe will also increase. Therefore, usually, a casing is used to protect the drill pipe and the drilling area. However, this kind of casing can only be used in stable geological layers and is difficult to provide sufficient drilling support in hard and complex blocked hole sections, resulting in low drilling efficiency. Therefore, it needs to be improved and optimized. Content of the Utility Model
[0005] In order to overcome the deficiencies of the prior art, the utility model provides a percussion type pipe placer in a coal mine downhole borehole, which has the advantage of self-vibration percussion.
[0006] To achieve the above purpose, the utility model provides the following technical solution: a percussion type pipe placer in a coal mine downhole borehole, including a drill pipe, an upper percussion hammer, a lower percussion hammer, a core pipe, a guide pipe and a fixing nut. The upper percussion hammer is connected to the drill pipe by a screw thread, and a first transmission convex block is arranged at the lower part of the upper percussion hammer and is connected to the core pipe;
[0007] The outer wall of the core pipe is movably sleeved with the inner wall of the guide pipe. The outer wall of the guide pipe is movably sleeved with an in-hole isolation casing. The upper part of the guide pipe is fixedly connected to the lower percussion hammer. A second transmission convex block is arranged at the upper part of the lower percussion hammer. The second transmission convex block and the first transmission convex block are meshed with each other. A fixing pipe is sleeved on the outer surface of the lower part of the core pipe.
[0008] As a preferred technical solution of the present utility model, the outer surface of the lower part of the fixed pipe is fixedly connected to a fixed nut, and the fixed nut is responsible for preventing the guide pipe from separating from the core pipe.
[0009] As a preferred technical solution of the present utility model, the outer wall of the lower part of the core pipe is provided with threads, and the core pipe and the fixed pipe are sleeved through the threads.
[0010] As a preferred technical solution of the present utility model, the end faces of the first driving convex block and the second driving convex block match, and both the first driving convex block and the second driving convex block can slide along the end face of the other.
[0011] As a preferred technical solution of the present utility model, the outer wall of the lower part of the in-hole isolation casing is fixedly provided with drilling teeth responsible for knocking the crushed stones, and the lower end face of the in-hole isolation casing contacts the blocked hole section.
[0012] As a preferred technical solution of the present utility model, the lower part of the lower knocking hammer is provided with teeth.
[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0014] 1. The present utility model drives the upper knocking hammer to push and rotate under high pressure through the torque and high-pressure driving force provided by the rotation of the drill pipe. At this time, the first driving convex block and the second driving convex block mesh with each other. Under the continuous rotation of the upper knocking hammer, the lower knocking hammer does not move. The relatively stationary second driving convex block of the first driving convex block rotating under high pressure, when the upper and lower convex blocks reset, the first driving convex block strongly knocks the second driving convex block, and conducts this strong knocking force to the in-hole isolation casing to be lowered into the hole, forcing the in-hole isolation casing to enter the blocked hole section, causing the drill pipe to be continuously squeezed and reset during rotation, further providing a continuous knocking force for the in-hole isolation casing. Due to the high impact force, and the knocking frequency can also be adjusted by the rotation speed of the drill pipe to adapt to the drilling requirements under different geological conditions, thus improving the drilling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 is a schematic structural diagram of the present utility model;
[0016] Figure 2 is a structural diagram of the in-hole isolation casing of the present utility model
[0017] Figure 3 is an exploded view of the present utility model;
[0018] Figure 4 is a schematic sectional view of the present utility model;
[0019] Figure 5 is a schematic structural diagram when the upper knocking hammer and the lower knocking hammer of the present utility model are operating;
[0020] Figure 6 This is a schematic diagram of the fixed nut structure of the present utility model.
[0021] In the figure: 1, drill pipe; 2, teeth; 3, upper percussion hammer; 4, first transmission convex block; 5, core pipe; 6, fixed pipe; 7, fixed nut; 8, guide pipe; 9, lower percussion hammer; 10, second transmission convex block; 11, in-hole isolation sleeve; 12, drilling teeth; 13, thread. Specific embodiments
[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0023] As Figures 1 to 6 shown, the present utility model provides a percussion-type downhole pipe placer in a coal mine borehole, including a drill pipe 1, an upper percussion hammer 3, a lower percussion hammer 9, a core pipe 5, a guide pipe 8, and a fixed nut 7. The upper percussion hammer 3 is threadedly connected to the drill pipe 1, and a first transmission convex block 4 is provided at the lower part of the upper percussion hammer 3 and is connected to the core pipe 5;
[0024] The outer wall of the core pipe 5 is movably sleeved with the inner wall of the guide pipe 8. The outer wall of the guide pipe 8 is movably sleeved with an in-hole isolation sleeve 11. The upper part of the guide pipe 8 is fixedly connected to the lower percussion hammer 9. A second transmission convex block 10 is provided at the upper part of the lower percussion hammer 9, and the second transmission convex block 10 and the first transmission convex block 4 are engaged with each other. The outer surface of the lower part of the core pipe 5 is sleeved with a fixed pipe 6.
[0025] When carrying out the drilling operation, the staff first use a drill bit with a diameter of 75 mm to drill in the coal mine underground. After reaching a certain depth, the bottom of the drill pipe reaches the blocked hole section in the coal mine underground. At this time, it is difficult for the drill pipe to continue drilling. Then the staff recover the 75 mm drill bit and use a drill bit with a diameter of 130 mm to expand the drill hole. After the expansion of the drill hole diameter is completed, the inner hole isolation sleeve 11 is lowered into the hole. When the bottom of the inner hole isolation sleeve 11 contacts the blocked hole section, the inner hole isolation sleeve 11 cannot continue to penetrate deeper. The staff thread-mount the lower part of the drill pipe 1 and the upper hammer 3. Then the staff control the drilling machine to always give the upper hammer 3 a downward high-pressure driving force through the drill pipe 1, ensuring that the inner hole isolation sleeve 11 always abuts against the blocked hole section, and drive the drilling machine to operate. At this time, the drill pipe 1 rotates clockwise (the clockwise rotation viewing direction is clockwise when looking from the drill pipe 1 towards the inner hole isolation sleeve 11), driving the upper hammer 3 to rotate. When the upper hammer 3 rotates, the inclined surface of the transmission convex block 4 abuts against the transmission convex block 2 10, causing the rotation of the upper hammer 3 to drive the lower hammer 9 to displace downward along the core pipe 5. However, the guide pipe 8 at the bottom of the lower hammer 9 is sleeved with the inner hole isolation sleeve 11. The diameter of the guide pipe 8 is slightly smaller than the inner wall diameter of the inner hole isolation sleeve 11. The guide pipe 8 is sleeved inside the inner hole isolation sleeve 11 to guide the lower hammer 9 and prevent the angle of the lower hammer 9 from deviating. And the bottom of the inner hole isolation sleeve 11 contacts the blocked hole section. At this time, the inner hole isolation sleeve 11 will not displace downward, which causes the upper hammer 3 to give the drill pipe 1 an upward thrust when rotating, making the drill pipe 1 slightly bent. It should be noted that the lengths of the transmission convex block 4 and the transmission convex block 2 10 are about 5 mm, and the drill pipe 1 is usually made of high-strength alloy steel material. These materials themselves have a certain elasticity, enough to support a deformation of 5 mm. And under the continuous rotation of the upper hammer 3, the drill pipe 1 will continuously bend slightly and reset, so that the lower hammer 9 is affected by the force of the upper hammer 3, thereby giving the inner hole isolation sleeve 11 a knocking force, making the inner hole isolation sleeve 11 move towards the blocked hole section.
[0026] Through the rotational torque of the drill pipe 1 and the high-pressure driving force, the upper percussion hammer 3 is driven to rotate under high pressure. At this time, the first transmission convex block 4 and the second transmission convex block 10 are engaged with each other. Under the continuous rotation of the upper percussion hammer 3, the lower percussion hammer 9 remains stationary. The relatively stationary second transmission convex block 10 of the first transmission convex block 4 that rotates under high pressure is strongly struck by the first transmission convex block 4 when the upper and lower convex blocks are reset. This strong knocking force is transmitted to the downhole isolation casing 11 in the hole to be inserted, forcing the downhole isolation casing 11 to enter the blocked hole section. Compared with the traditional device, this device continuously squeezes and resets the drill pipe 1 during rotation, further providing a continuous knocking force for the downhole isolation casing 11. Due to the high impact force, the knocking frequency can also be adjusted by the rotation speed of the drill pipe 1 to meet the drilling requirements under different geological conditions, improving the drilling efficiency.
[0027] Under the continuous rotation of the upper percussion hammer 3, the drill pipe 1 will continuously undergo micro-deformation and reset. The upper percussion hammer 3 will continuously reciprocate during the process of the drill pipe 1 from micro-deformation to reset, and then apply force to the lower percussion hammer 9, thereby giving a knocking force to the downhole isolation casing 11, and further causing the downhole isolation casing 11 to move towards the blocked hole section.
[0028] Among them, the outer surface of the lower part of the fixed pipe 6 is fixedly connected to the fixed nut 7, and the fixed nut 7 is responsible for preventing the guide pipe 8 from detaching from the core pipe 5.
[0029] Through the setting of the fixed nut 7, it is prevented that the guide pipe 8 and the lower percussion hammer 9 detach from the core pipe 5, providing guarantee for the knocking operation, and Figure 4 As shown, a water passage is provided inside the core pipe 5, which is responsible for dissipating heat for the upper percussion hammer 3 and the lower percussion hammer 9.
[0030] Among them, external threads 13 are provided on the outer wall of the lower part of the core pipe 5, and the core pipe 5 and the fixed pipe 6 are threadedly sleeved through the threads 13.
[0031] Through the setting of the threads 13, it is convenient for the installation and fixation of the fixed nut 7.
[0032] Among them, the end faces of the first transmission convex block 4 and the second transmission convex block 10 are matched, and both the first transmission convex block 4 and the second transmission convex block 10 can slide along the end face of the other.
[0033] Among them, drilling teeth 12 responsible for knocking gravel are fixedly provided on the outer wall of the lower part of the downhole isolation casing 11, and the lower end face of the downhole isolation casing 11 is in contact with the blocked hole section.
[0034] Among them, teeth 2 are provided at the lower part of the lower percussion hammer 9 to prevent the lower percussion hammer 9 from rotating following the upper percussion hammer 3.
[0035] The teeth 2 of the lower percussion hammer 9 are in pressure contact with the end face of the inner-hole isolation sleeve 11, and the inner-hole isolation sleeve 11 does not rotate, so the lower percussion hammer 9 will not rotate under the action of the upper percussion hammer 3.
[0036] Through the torque provided by the drill pipe 1, when the inner-hole isolation sleeve 11 is struck up and down, the drilling teeth 12 on the outer wall of the inner-hole isolation sleeve 11 can also break and strike the blocked hole section. The function of the drilling teeth 12 is not only to break and strike the blocked hole section to enable the inner-hole isolation sleeve 11 to better enter the blocked hole section, but also to prevent the inner-hole isolation sleeve 11 from rotating and prevent the entire device from failing.
[0037] As Figure 1 shown, in the above description, the lower part is the right side and the upper part is the left side, and the directions of other drawings are the same.
[0038] The working principle and usage process of the present utility model:
[0039] During the drilling operation, the staff first uses a drill bit with a diameter of 75 mm to drill in the coal mine underground. After reaching a certain depth, the bottom of the drill pipe reaches the blocked hole section underground. At this time, it is difficult for the drill pipe to continue drilling. At this time, the staff retrieves the 75 mm drill bit and uses a drill bit with a diameter of 130 mm to enlarge the drill hole. After the drill hole diameter enlargement is completed, the inner-hole isolation sleeve 11 is lowered into the hole. When the bottom of the inner-hole isolation sleeve 11 contacts the blocked hole section, the staff thread-mounts the connecting piece 2 at the bottom of the drill pipe 1 and the upper percussion hammer 3 to complete the preparatory operation for drilling the blocked hole section. Then the staff controls the drilling machine to always give the upper percussion hammer 3 a downward force through the drill pipe 1 to ensure that the inner-hole isolation sleeve 11 is always in contact with the blocked hole section, and drives the drilling machine to operate. At this time, the drill pipe 1 rotates clockwise to drive the upper percussion hammer 3 to rotate. When the upper percussion hammer 3 rotates, the top of the inclined surface of the transmission convex block 4 abuts against the top of the inclined surface of the transmission convex block 10, and the drill pipe 1 is slightly bent. When the upper percussion hammer 3 rotates a little (the rotation speed of the drill pipe 1 is relatively fast, so that the frequency of the upper percussion hammer 3 striking the lower percussion hammer 9 is also relatively high), the rotation of the upper percussion hammer 3 attempts to drive the lower percussion hammer 9 to displace downward along the core pipe 5. However, the guide pipe 8 at the bottom of the lower percussion hammer 9 is movably sleeved with the inner-hole isolation sleeve 11, and the bottom of the inner-hole isolation sleeve 11 abuts against the blocked hole section. At this time, the inner-hole isolation sleeve 11 will not displace downward. The lengths of the transmission convex block 4 and the transmission convex block 10 are about 5 mm, and the drill pipe 1 is usually made of high-strength alloy steel material, and these materials themselves have a certain elasticity, which is sufficient to support a deformation of 5 mm. And under the continuous rotation of the upper percussion hammer 3, the drill pipe 1 will continuously bend and reset, thereby giving the inner-hole isolation sleeve 11 an up-and-down striking force and breaking the blocked hole section through the serrated end face on the right side of the inner-hole isolation sleeve 11.
[0040] It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.
[0041] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A percussion type pipe lowering device in a borehole underground in a coal mine, comprising a drill pipe (1), an upper percussion hammer (3), a lower percussion hammer (9), a core pipe (5), a guide pipe (8) and a fixing nut (7), characterized in that: The upper percussion hammer (3) is threadedly connected to the drill pipe (1), and a first transmission convex block (4) is arranged at the lower part of the upper percussion hammer (3) and is connected to the core pipe (5); The outer wall of the core pipe (5) is movably sleeved with the inner wall of the guide pipe (8), the outer wall of the guide pipe (8) is movably sleeved with an in-hole isolation sleeve (11), the upper part of the guide pipe (8) is fixedly connected to the lower percussion hammer (9), a second transmission convex block (10) is arranged at the upper part of the lower percussion hammer (9), the second transmission convex block (10) and the first transmission convex block (4) are meshed with each other, and the outer surface of the lower part of the core pipe (5) is sleeved with a fixed pipe (6).
2. The percussion type pipe lowering device in a borehole in a coal mine according to claim 1, characterized in that: The outer surface of the lower part of the fixed pipe (6) is fixedly connected to a fixed nut (7), and the fixed nut (7) is responsible for preventing the guide pipe (8) from detaching from the core pipe (5).
3. The percussion type pipe lowering device in a borehole underground in a coal mine according to claim 1, wherein: External threads (13) are provided on the outer wall of the lower part of the core pipe (5), and the core pipe (5) and the fixed pipe (6) are threadedly sleeved through the threads (13).
4. The percussion type pipe lowering device in a borehole underground in a coal mine according to claim 1, wherein: The end faces of the first transmission convex block (4) and the second transmission convex block (10) match each other, and both the first transmission convex block (4) and the second transmission convex block (10) can slide along the end face of the other.
5. A percussion type pipe lowering device in a borehole underground in a coal mine according to claim 1, characterized in that: Drilling teeth (12) responsible for knocking crushed stones are fixedly provided on the outer wall of the lower part of the in-hole isolation sleeve (11), and the lower end face of the in-hole isolation sleeve (11) is in contact with the blocked hole section.
6. The percussion type pipe lowering device in a borehole underground in a coal mine according to claim 1, wherein: Teeth (2) are provided in the lower part of the lower percussion hammer (9).