Low-stress high-torque-resistance double-thread drill rod joint

Abstract

The invention provides a low-stress high-torque-resistance double-thread drill rod joint, which relates to the technical field of drill rod joints, and comprises a male joint, a female joint and a reinforcing structure, one end of the male connector is provided with the female connector, the end, close to the female connector, of the male connector is provided with the first external thread, the end of the first external thread is provided with the guide conical head, through arrangement of the reinforcing structure, the connection stability of the male connector and the female connector is enhanced, and the phenomenon that the male connector and the female connector are loosened due to high-frequency vibration in the drilling process is prevented to a great extent; serious accidents such as drill hole collapse and drill rod breakage caused by loosening of the connector are effectively avoided, it is ensured that drilling work can be continuously and stably carried out, through the arrangement of the disassembling assembly, abraded threads can be independently disassembled, only the corresponding abraded threads need to be replaced, the whole connector does not need to be disassembled and replaced, and the working efficiency is improved. And therefore, the problem of resource waste in a traditional integral replacement mode is effectively avoided, and the maintenance cost is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of drill pipe joints, and particularly to a double - headed threaded drill pipe joint with low stress and high anti - torque. Background Art

[0002] In the field of modern resource exploration and development, the drilling operations of energy such as oil and natural gas are continuously expanding into deep and complex geological areas, which pose unprecedented challenges to the performance of drill pipe joints. As the core component in the drill pipe system for torque transmission and drill string connection, the performance of drill pipe joints directly affects the safety, efficiency, and cost of drilling operations. However, the currently widely used double - headed threaded drill pipe joints are only connected by thread meshing. During the drilling process, they are prone to loosening due to high - frequency vibration, affecting the normal progress of drilling work. Moreover, due to the long - term rotation between the drill pipe joint and the drill pipe, the threads of the joint are easily worn, which in turn affects the connection stability between the drill pipe joint and the drill pipe. When the damage is severe, replacement is required. However, the current replacement method can only replace the entire drill pipe joint, resulting in waste of resources in other parts of the drill pipe joint and indirectly increasing the maintenance cost. Summary of the Invention

[0003] In view of this, the present invention provides a double - headed threaded drill pipe joint with low stress and high anti - torque. Through the setting of a reinforcement structure, it can strengthen the connection stability between the male joint and the female joint, greatly prevent the loosening of the two due to high - frequency vibration during the drilling process, effectively avoid serious accidents such as borehole collapse and drill pipe breakage caused by joint loosening, ensure the continuous and stable progress of drilling work, and greatly improve the safety and reliability of operations; through the setting of a double - seal structure, it effectively forms a double - seal barrier, can maintain a good sealing effect under downhole conditions of high pressure, high temperature, and complex chemical environments, effectively prevent the leakage of drilling fluid, protect the downhole environment, ensure the stability of the drilling fluid performance, increase the service life of the drill bit, and reduce the risk of accidents such as sticking of the drill pipe; through the setting of split components, the threads of the connection part are designed modularly, and the worn threads can be disassembled separately. When the threads are worn due to long - term use, only the corresponding worn threads need to be replaced, and there is no need to disassemble and replace the entire joint, enabling the joint to resume normal work. This effectively avoids the problem of resource waste in the traditional overall replacement mode, maximizes the utilization of other intact parts of the joint, greatly reduces the maintenance cost, and significantly improves the economic efficiency and sustainability of the drill pipe joint, providing a strong guarantee for the efficient and low - cost operation of drilling operations.

[0004] The present invention provides a double - headed threaded drill pipe joint with low stress and high anti - torque, which specifically includes: a male joint, a female joint, and a reinforcement structure; One end of the male connector is provided with a female connector. One end of the male connector close to the female connector is provided with an external first thread. The end of the external first thread is provided with a guiding cone head. One end of the female connector close to the male connector is provided with an internal first thread, and the internal first thread meshes with the external first thread. A reinforcing structure is provided on the outer sides of the male connector and the female connector, and the reinforcing structure includes: A limiting convex disk, fixedly connected to the outer side of one end of the male connector, and limiting slots are opened at the four sides of the limiting convex disk; A first outer ring, fixedly connected to the outer side of the female connector. A second outer ring is provided at the rear side of the first outer ring. An external second thread is opened on the outer side of the female connector between the first outer ring and the second outer ring, and a compression nut is meshed with the external second thread; A moving sliding ring is slidably installed between the first outer ring and the second outer ring. Connecting convex blocks are fixedly connected to the four outer sides of the moving sliding ring, and limiting insertion strips are fixedly connected to the connecting convex blocks. The limiting insertion strips are inserted into the limiting slots.

[0005] In at least some embodiments, a guiding groove is opened on the female connector between the first outer ring and the second outer ring. A guiding convex block is fixedly connected to the inner side wall of the moving sliding ring, and the guiding convex block is fitted and slidably installed in the guiding groove.

[0006] In at least some embodiments, a sealing structure is provided between the male connector and the female connector. The sealing structure includes a first sealing groove, a first sealing ring, a second sealing groove and a second sealing ring. The end of the external first thread and the inner side wall of the female connector are provided with the first sealing groove, and the first sealing ring is installed inside the first sealing groove. And a second sealing groove is opened at the end of the female connector and the root of the external first thread. At the same time, the second sealing ring is installed inside the second sealing groove.

[0007] In at least some embodiments, a splitting component is provided on the male connector and the female connector. The splitting component includes an installation slot hole and a positioning slot. The end of the male connector is provided with the installation slot hole. A positioning slot is opened on the inner side wall of the installation slot hole. An assembly ring is fitted and installed in the installation slot hole. Positioning convex strips are fixedly connected to the four sides of the assembly ring, and the positioning convex strips are inserted into the positioning slot. At the same time, an internal second thread is opened on the inner side wall of the assembly ring.

[0008] In at least some embodiments, a limiting inner ring is provided at the end of the assembly ring. The outer side of the limiting inner ring is fixedly connected to one end of a limiting cylinder. The limiting cylinder is installed on the outer side of the male connector. And the other end of the limiting cylinder is fixedly connected to a connecting disk, and a first through hole is opened on the connecting disk.

[0009] In at least some embodiments, a fixed disk is fixedly connected to the outer side of the male connector on one side of the connecting disk. A second through hole is opened on the fixed disk. A bolt is installed in the first through hole and the second through hole, and a fastening nut is meshed with the outer side of the bolt.

[0010] In at least some embodiments, one end of the female joint is fixedly connected with a connecting pillar. A third internal thread is provided inside the connecting pillar, and a guiding slot is provided outside the connecting pillar.

[0011] In at least some embodiments, a threaded ring is provided outside the connecting pillar. A third external thread is provided outside the threaded ring, and a guiding insert is fixedly connected to the inner side wall of the threaded ring. The guiding insert is fitted and inserted into the guiding slot.

[0012] In at least some embodiments, a limiting screw cylinder is engaged in the third internal thread. One end of the limiting screw cylinder is fixedly connected with a pressing convex ring. The pressing convex ring is arranged outside the guiding insert. At the same time, hexagonal slots are provided in the inner side walls of the limiting screw cylinder and the pressing convex ring.

[0013] A low-stress and high anti-torque double-thread drill pipe joint provided by the present invention has the following beneficial effects Through the setting of the reinforcement structure, the stability of the connection between the male joint and the female joint is strengthened, and the loosening phenomenon of the two caused by high-frequency vibration during the drilling process is greatly prevented. Serious accidents such as borehole collapse and drill pipe breakage caused by joint loosening are effectively avoided, ensuring that the drilling work can proceed continuously and stably, and greatly improving the safety and reliability of the operation.

[0014] Through the setting of the double-sealing structure, a double-sealing barrier is effectively formed, which can maintain a good sealing effect under downhole conditions of high pressure, high temperature and complex chemical environments, effectively prevent the leakage of drilling fluid, protect the downhole environment, ensure the stability of the drilling fluid performance at the same time, improve the service life of the drill bit, and reduce the risk of accidents such as sticking of the drill.

[0015] Through the setting of the split components, the threads of the connecting part are designed modularly, and the worn threads can be disassembled separately. When the threads are worn due to long-term use, only the corresponding worn threads need to be replaced, and there is no need to disassemble and replace the whole joint, so that the joint can continue to work normally, effectively avoiding the waste of resources in the traditional overall replacement mode. By maximizing the use of other intact parts of the joint, the maintenance cost is greatly reduced, and the economy and sustainability of the drill pipe joint are significantly improved, providing a strong guarantee for the efficient and low-cost operation of the drilling operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below.

[0017] The drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0018] In the drawings: Figure 1Shows the overall structural schematic diagram according to the present invention; Figure 2 Shows the sealing structural schematic diagram according to the present invention; Figure 3 Shows the structural schematic diagram of the limiting convex disk in the reinforcement structure according to the present invention; Figure 4 Shows the structural schematic diagram of some components in the reinforcement structure according to the present invention; Figure 5 Shows the split structural schematic diagram of the male joint component in the split component according to the present invention; Figure 6 Shows the combined structural schematic diagram of the male joint in the split component according to the present invention; Figure 7 Shows the split structural schematic diagram of the female joint component in the split component according to the present invention; Figure 8 Shows the combined structural schematic diagram of the female joint in the split component according to the present invention; List of reference numerals 1. Male joint; 101. First external thread; 1011. Guide cone head; 2. Female joint; 201. First internal thread; 3. Sealing structure; 301. First sealing groove; 3011. First sealing ring; 302. Second sealing groove; 3021. Second sealing ring; 4. Reinforcement structure; 401. Limiting convex disk; 4011. Limiting slot; 402. First outer ring; 4021. Second outer ring; 4022. Second external thread; 4023. Guide groove; 4024. Compression nut; 403. Moving sliding ring; 4031. Guide projection; 4032. Connecting projection; 4033. Limiting insertion bar; 5. Split component; 501. Mounting slot hole; 5011. Positioning slot; 502. Assembly ring; 5021. Second internal thread; 5022. Positioning rib; 503. Limiting cylinder; 5031. Limiting inner ring; 5032. Connecting disk; 5033. First through hole; 504. Fixed disk; 5041. Second through hole; 505. Bolt; 5051. Fastening nut; 506. Connecting pillar; 5061. Third internal thread; 5062. Guide slot; 507. Threaded ring; 5071. Third external thread; 5072. Guide insert 508. Limit screw cylinder; 5081. Pressing convex ring; 5082. Hexagonal slot Specific implementation mode

[0019] In this embodiment: Please refer to Figures 1 to 8 : The present invention provides a low-stress and high anti-torque double-thread drill pipe joint, including: male joint 1, female joint 2 and reinforcement structure 4 One end of the male joint 1 is provided with a female joint 2. One end of the male joint 1 close to the female joint 2 is provided with a first external thread 101. The end of the first external thread 101 is provided with a guide cone head 1011. One end of the female joint 2 close to the male joint 1 is provided with a first internal thread 201. The first internal thread 201 meshes with the first external thread 101. The outer sides of the male joint 1 and the female joint 2 are provided with a reinforcement structure 4, and the reinforcement structure 4 includes: Limit convex disk 401, fixedly connected to the outer side of one end of the male joint 1. Limit slots 4011 are opened at the four sides of the limit convex disk 401 First outer ring 402, fixedly connected to the outer side of the female joint 2. A second outer ring 4021 is provided at the rear side of the first outer ring 402. A second external thread 4022 is opened on the outer side of the female joint 2 between the first outer ring 402 and the second outer ring 4021. A pressing nut 4024 is meshed on the second external thread 4022 Moving sliding ring 403, slidably installed between the first outer ring 402 and the second outer ring 4021. Connecting convex blocks 4032 are fixedly connected to the four outer sides of the moving sliding ring 403. Limit insert strips 4033 are fixedly connected to the connecting convex blocks 4032. The limit insert strips 4033 are inserted into the limit slots 4011

[0020] A guide groove 4023 is opened on the female joint 2 between the first outer ring 402 and the second outer ring 4021. A guide convex block 4031 is fixedly connected to the inner side wall of the moving sliding ring 403. The guide convex block 4031 is fitted and slidably installed in the guide groove 4023

[0021] A sealing structure 3 is provided between the male joint 1 and the female joint 2. The sealing structure 3 includes a first sealing groove 301, a first sealing ring 3011, a second sealing groove 302 and a second sealing ring 3021. A first sealing groove 301 is opened at the end of the first external thread 101 and the inner side wall of the female joint 2. A first sealing ring 3011 is installed inside the first sealing groove 301. A second sealing groove 302 is opened at the end of the female joint 2 and the root of the first external thread 101. At the same time, a second sealing ring 3021 is installed inside the second sealing groove 302

[0022] When connecting the drill pipes, first align the guiding conical head 1011 of the male joint 1 with the connection port of the female joint 2, and then slowly insert the male joint 1 into the female joint 2. Under the action of the guiding conical head 1011, the male joint 1 can be quickly and accurately centered. As the male joint 1 is deeply inserted, the first external thread 101 and the first internal thread 201 gradually mesh, thereby completing the preliminary connection between the male joint 1 and the female joint 2. After the connection is completed, the limiting slot 4011 on the limiting convex disk 401 is aligned with the limiting insertion strip 4033. Then, by rotating the compression nut 4024, it moves under the meshing action of the second external thread 4022, thereby pushing the moving sliding ring 403 to move. Finally, the moving sliding ring 403 drives the limiting insertion strip 4033 to be inserted into the limiting slot 4011, and at the same time, the compression nut 4024 presses and limits the moving sliding ring 403, thereby completing the further reinforcement of the two, and finally completing the connection between the male joint 1 and the female joint 2. At the same time, after the first external thread 101 and the first internal thread 201 are meshed, the first sealing ring 3011 and the second sealing ring 3021 are squeezed and deformed, so that they are closely attached to the first sealing groove 301 and the second sealing groove 302, thereby completing effective double-layer sealing.

[0023] Embodiment 2: On the basis of Embodiment 1, as Figures 5 to 8 shown, a splitting component 5 is provided on the male joint 1 and the female joint 2. The splitting component 5 includes an installation slot hole 501 and a positioning slot 5011. The end of the male joint 1 is provided with the installation slot hole 501. The inner side wall of the installation slot hole 501 is provided with the positioning slot 5011. An assembly ring 502 is fitted and installed in the installation slot hole 501. Positioning convex strips 5022 are fixedly connected to the four sides of the assembly ring 502. The positioning convex strips 5022 are inserted into the positioning slot 5011. At the same time, a second internal thread 5021 is provided on the inner side wall of the assembly ring 502.

[0024] A limiting inner ring 5031 is provided at the end of the assembly ring 502. The outer side of the limiting inner ring 5031 is fixedly connected to one end of a limiting cylinder 503. The limiting cylinder 503 is installed on the outer side of the male joint 1, and the other end of the limiting cylinder 503 is fixedly connected to a connection disk 5032. A first through hole 5033 is provided on the connection disk 5032.

[0025] A fixed disk 504 is fixedly connected to the outer side of the male joint 1 on one side of the connection disk 5032. A second through hole 5041 is provided on the fixed disk 504. A bolt 505 is installed in the first through hole 5033 and the second through hole 5041. A fastening nut 5051 is meshed on the outer side of the bolt 505.

[0026] One end of the female joint 2 is fixedly connected to a connection pillar 506. A third internal thread 5061 is provided inside the connection pillar 506, and a guiding slot 5062 is provided on the outer side of the connection pillar 506.

[0027] A threaded ring 507 is disposed on the outer side of the connecting pillar 506 . A third outer thread 5071 is formed on the outer side of the threaded ring 507 . A guide strip 5072 is fixedly connected to the inner side wall of the threaded ring 507 . The guide strip 5072 is inserted into the guide slot 5062 .

[0028] The third internal thread 5061 is meshed with a limiting screw barrel 508, and the end of the limiting screw barrel 508 is fixedly connected with a clamping convex ring 5081, which is arranged on the outside of the guide insert 5072. At the same time, the inner side walls of the limiting screw barrel 508 and the clamping convex ring 5081 are provided with a hexagonal slot 5082.

[0029] When the thread at the end of the male connector 1 is damaged, the fastening nut 5051 is removed from the bolt 505, and then the bolt 505 is disassembled, thereby releasing the fixation of the connecting plate 5032 and the fixing plate 504, and then the limiting cylinder 503 can be removed, thereby releasing the limiting inner ring 5031 on the assembly ring 502, and then the assembly ring 502 can be pulled out and replaced. During installation, it is only necessary to align the positioning convex strips 5022 on the four sides of the assembly ring 502 with the positioning slots 5011, and then push the assembly ring 502 into the installation slot 501, and then put the limiting cylinder 503 on the outside of the male connector 1 so that it aligns the first through hole 5033 with the second through hole The holes 5041 are aligned, and then the bolt 505 and the fastening nut 5051 are used to tighten the two to complete the replacement; when the third threaded external thread 5071 on the female connector 2 is damaged, at this time, the hexagonal tool is inserted into the hexagonal slot 5082, and the limiting screw barrel 508 is removed by reverse rotation, thereby releasing the limit on the guide strip 5072, so that the threaded ring 507 can be removed. When replacing, it is only necessary to insert the guide strip 5072 into the guide slot 5062, and then use the hexagonal tool to install the limiting screw barrel 508, and at the same time, the pressing convex ring 5081 is embedded in the front end of the guide strip 5072 to limit it, and finally the threaded ring 507 is installed.

[0030] Specific usage and functions of this embodiment: In the present invention, first, the first sealing ring 3011 and the second sealing ring 3021 are installed into the first sealing groove 301 and the second sealing groove 302. Then, the guiding cone head 1011 of the male connector 1 is aligned with the connection port of the female connector 2. Then, the male connector 1 is slowly inserted into the female connector 2. Under the action of the guiding cone head 1011, the male connector 1 can be quickly and accurately centered. As the male connector 1 is inserted deeper, the first external thread 101 and the first internal thread 201 gradually engage. When the first external thread 101 and the first internal thread 201 are fully engaged, the first sealing ring 3011 and the second sealing ring 3021 are squeezed and deformed, so that they are tightly fitted in the first sealing groove 301 and the second sealing groove 302, thus completing effective double-layer sealing and at the same time completing the preliminary connection between the male connector 1 and the female connector 2. After the connection is completed, the limiting slot 4011 on the limiting convex disk 401 is aligned with the limiting insertion strip 4033. Then, by rotating the compression nut 4024, it moves under the meshing action of the second external thread 4022, thereby pushing the moving sliding ring 403 to move. Finally, the moving sliding ring 403 drives the limiting insertion strip 4033 to be inserted into the limiting slot 4011, and at the same time the compression nut 4024 presses and limits the moving sliding ring 403, thereby completing the further reinforcement of the two, and finally completing the connection between the male connector 1 and the female connector 2, strengthening the connection stability between the male connector 1 and the female connector 2, greatly preventing the loosening of the two caused by high-frequency vibration during the drilling process, effectively avoiding serious accidents such as borehole collapse and drill pipe breakage caused by the loosening of the connector, ensuring that the drilling work can proceed continuously and stably, and greatly improving the safety and reliability of the operation. Then, after the combination is completed, the two ends of the drill pipe connector are respectively connected to the ends of the two groups of drill pipes, thus completing the overall assembly. However, when the thread at the male connector 1 end is damaged, at this time, the fastening nut 5051 is removed from the bolt 505, and then the bolt 505 is disassembled, thereby releasing the fixation between the connection disk 5032 and the fixed disk 504. Then, the limiting cylinder 503 can be removed, thereby releasing the limitation of the limiting inner ring 5031 on the assembly ring 502. Then, the assembly ring 502 can be pulled out, and thus it can be replaced. When installing, only need to align the positioning convex strips 5022 at the four sides of the assembly ring 502 with the positioning slots 5011, then push the assembly ring 502 into the installation slot hole 501, then put the limiting cylinder 503 on the outside of the male connector 1 to align the first through hole 5033 with the second through hole 5041, and then fasten the two through the cooperation of the bolt 505 and the fastening nut 5051 to complete the replacement;When the external male thread 5071 on the female connector 2 is damaged, at this time, by inserting a hexagonal tool into the hexagonal slot 5082 and rotating it in the reverse direction to remove the limit screw cylinder 508, the limit on the guiding insert 5072 can be released, and then the threaded ring 507 can be removed. When replacing, just insert the guiding insert 5072 into the guiding slot 5062, and then use the hexagonal tool to install the limit screw cylinder 508. At the same time, the pressing convex ring 5081 is embedded at the front end of the guiding insert 5072 to limit it. Finally, the threaded ring 507 is installed, making the thread of the connecting part adopt a modular design, and the worn thread can be disassembled separately. When the thread wears due to long-term use, only the corresponding worn thread needs to be replaced, and there is no need to disassemble and replace the entire connector, enabling the connector to resume normal operation, effectively avoiding the problem of resource waste in the traditional overall replacement mode.

Claims

1. A double - ended threaded drill pipe joint with low stress and high anti - torque, comprising: Male connector (1), female connector (2) and reinforcement structure (4); One end of the male connector (1) is provided with a female connector (2). One end of the male connector (1) close to the female connector (2) is provided with a first external thread (101). The end of the first external thread (101) is provided with a guiding cone head (1011). One end of the female connector (2) close to the male connector (1) is provided with a first internal thread (201). The first internal thread (201) meshes with the first external thread (101). A reinforcement structure (4) is provided on the outer sides of the male connector (1) and the female connector (2). It is characterized in that the reinforcement structure (4) includes: A limit convex disk (401), fixedly connected to the outer side of one end of the male connector (1). Limit slots (4011) are opened at the four sides of the limit convex disk (401); A first outer ring (402), fixedly connected to the outer side of the female connector (2). A second outer ring (4021) is provided at the rear side of the first outer ring (402). A second external thread (4022) is opened on the outer side of the female connector (2) between the first outer ring (402) and the second outer ring (4021). A compression nut (4024) is meshed on the second external thread (4022); A movable sliding ring (403), slidably installed between the first outer ring (402) and the second outer ring (4021). Connecting convex blocks (4032) are fixedly connected to the four outer sides of the movable sliding ring (403). Limit insertion strips (4033) are fixedly connected to the connecting convex blocks (4032). The limit insertion strips (4033) are inserted into the limit slots (4011).

2. The double-headed threaded drill pipe joint with low stress and high anti-torque according to claim 1, characterized in that: A guiding groove (4023) is opened on the female connector (2) between the first outer ring (402) and the second outer ring (4021). A guiding convex block (4031) is fixedly connected to the inner side wall of the movable sliding ring (403). The guiding convex block (4031) is fitted and slidably installed in the guiding groove (4023).

3. A low-stress and high anti-torque double-thread drill pipe joint according to claim 1, characterized in that: A sealing structure (3) is provided between the male connector (1) and the female connector (2). The sealing structure (3) includes a first sealing groove (301), a first sealing ring (3011), a second sealing groove (302) and a second sealing ring (3021). A first sealing groove (301) is opened at the end of the first external thread (101) and the inner side wall of the female connector (2). A first sealing ring (3011) is installed inside the first sealing groove (301). A second sealing groove (302) is opened at the end of the female connector (2) and the root of the first external thread (101). At the same time, a second sealing ring (3021) is installed inside the second sealing groove (302).

4. The double - ended threaded drill pipe joint with low stress and high anti - torque according to claim 1, wherein: The male connector (1) and the female connector (2) are provided with a disassembly component (5). The disassembly component (5) includes a mounting slot hole (501) and a positioning slot (5011). The end of the male connector (1) is provided with the mounting slot hole (501). A positioning slot (5011) is formed on the inner side wall of the mounting slot hole (501). An assembly ring (502) is fitted and mounted in the mounting slot hole (501). Positioning ridges (5022) are fixedly connected to the four sides of the assembly ring (502). The positioning ridges (5022) are inserted into the positioning slot (5011). At the same time, a second internal thread (5021) is formed on the inner side wall of the assembly ring (502).

5. A low-stress and high anti-torque double-headed drill pipe joint according to claim 4, characterized in that: A limiting inner ring (5031) is provided at the end of the assembly ring (502). The outer side of the limiting inner ring (5031) is fixedly connected to one end of a limiting cylinder (503). The limiting cylinder (503) is mounted on the outer side of the male connector (1). And the other end of the limiting cylinder (503) is fixedly connected to a connection disk (5032). A first through hole (5033) is formed in the connection disk (5032).

6. The double - end threaded drill pipe joint with low stress and high anti - torque according to claim 5, characterized in that: A fixed disk (504) is fixedly connected to the outer side of the male connector (1) on one side of the connection disk (5032). A second through hole (5041) is formed in the fixed disk (504). A bolt (505) is mounted in the first through hole (5033) and the second through hole (5041). A fastening nut (5051) is engaged with the outer side of the bolt (505).

7. A low-stress and high anti-torque double-headed drill pipe joint according to claim 1, characterized in that: One end of the female connector (2) is fixedly connected to a connection support column (506). A third internal thread (5061) is formed inside the connection support column (506). A guiding slot (5062) is formed on the outer side of the connection support column (506).

8. The double-headed threaded drill pipe joint with low stress and high anti-torque according to claim 3, characterized in that: A threaded ring (507) is provided on the outer side of the connection support column (506). A third external thread (5071) is formed on the outer side of the threaded ring (507). A guiding insertion bar (5072) is fixedly connected to the inner side wall of the threaded ring (507). The guiding insertion bar (5072) is fitted and inserted into the guiding slot (5062).

9. A low-stress and high anti-torque double-headed drill pipe joint according to claim 7, characterized in that: A limiting screw cylinder (508) is engaged in the third internal thread (5061). A pressing convex ring (5081) is fixedly connected to the end of the limiting screw cylinder (508). The pressing convex ring (5081) is arranged on the outer side of the guiding insertion bar (5072). At the same time, hexagonal slots (5082) are formed in the inner side walls of the limiting screw cylinder (508) and the pressing convex ring (5081).

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