A low stress high torque double-shouldered threaded drill pipe joint

Abstract

The application provides a low-stress high-torque double-end threaded drill pipe joint, and relates to the technical field of drill pipe joints.The low-stress high-torque double-end threaded drill pipe joint comprises a male joint, a female joint and a reinforcing structure.The one end of the male joint is provided with the female joint, and the one end of the male joint close to the female joint is provided with a first threaded outer wire.The end of the first threaded outer wire is provided with a guide cone head.The reinforcing structure is arranged to strengthen the stability of the connection between the male joint and the female joint, greatly prevent the loosening of the male joint and the female joint due to high-frequency vibration during drilling, effectively avoid serious accidents such as drilling collapse and drill pipe breakage caused by joint loosening, ensure that the drilling work can be continuously and stably carried out, and make the worn threads be separately disassembled through the arrangement of the split assembly, so that only the corresponding worn threads need to be replaced, the whole joint need not be disassembled and replaced, the joint can continue to work normally, the resource waste problem under the traditional overall replacement mode is effectively avoided, and the maintenance cost is greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drill pipe joints, in particular to a low-stress high-torque double-end threaded drill pipe joint. BACKGROUND

[0002] In the modern resource exploration and development field, the drilling operation of energy such as oil and natural gas is constantly expanding to deep and complex geological areas, which poses unprecedented challenges to the performance of drill pipe joints. As the core component of the drill pipe system for torque transmission and drill string connection, the performance of the drill pipe joint directly affects the safety, efficiency and cost of the drilling operation. However, the current widely used double-end threaded drill pipe joints are only connected by thread engagement, which is prone to disengagement due to high-frequency vibration during drilling, affecting the normal progress of drilling work. Moreover, the threads of the drill pipe joint are prone to wear due to long-term rotation and torsion with the drill pipe, which affects the stability of the connection between the drill pipe joint and the drill pipe. In severe cases, the drill pipe joint needs to be replaced, but the current replacement method can only replace the entire drill pipe joint, resulting in waste of resources of other parts of the drill pipe joint and indirectly increasing the maintenance cost. SUMMARY

[0003] Therefore, the present application provides a low-stress high-torque double-end threaded drill pipe joint, which can strengthen the stability of the connection between the male joint and the female joint by the arrangement of the reinforcing structure, greatly prevent the disengagement of the two due to high-frequency vibration during drilling, effectively avoid serious accidents such as drill hole collapse and drill pipe breakage caused by joint disengagement, ensure the continuous and stable progress of drilling work, and greatly improve the safety and reliability of the operation. The arrangement of the double-sealing structure effectively forms a double-sealing barrier, which can maintain good sealing effect in high-pressure, high-temperature and complex chemical environment downhole conditions, effectively prevent drilling fluid leakage, protect the downhole environment, ensure the stability of the drilling fluid performance, improve the service life of the drill bit, and reduce the risk of accidents such as sticking.

[0004] The present application provides a low-stress high-torque double-end threaded drill pipe joint, which specifically comprises: a male joint, a female joint and a reinforcing structure.

[0005] One end of the male joint is provided with a female joint, one end of the male joint close to the female joint is provided with a first threaded outer wire, the end of the first threaded outer wire is provided with a guide cone, one end of the female joint close to the male joint is provided with a first threaded inner wire, the first threaded inner wire is engaged with the first threaded outer wire, the outer side of the male joint and the female joint is provided with a reinforcing structure, the reinforcing structure comprises:

[0006] The limiting convex disc is fixedly connected to the outer side of one end of the male joint, and limiting insertion grooves are formed at the four edges of the limiting convex disc;

[0007] The first outer ring is fixedly connected to the outer side of the female joint, the rear side of the first outer ring is provided with a second outer ring, a second threaded outer wire is formed on the outer side of the female joint between the first outer ring and the second outer ring, and a compression nut is engaged on the second threaded outer wire;

[0008] The movable sliding ring is slidingly installed between the first outer ring and the second outer ring, the outer side of the movable sliding ring is fixedly connected with connecting convex blocks, limiting insertion strips are fixedly connected to the connecting convex blocks, and the limiting insertion strips are inserted into the limiting insertion grooves.

[0009] In at least some embodiments, a guide groove is formed on the female joint between the first outer ring and the second outer ring, and a guide convex block is fixedly connected to the inner side wall of the movable sliding ring, and the guide convex block is slidingly installed in the guide groove.

[0010] In at least some embodiments, a sealing structure is arranged between the male joint and the female joint, the sealing structure comprises a first sealing groove, a first sealing ring, a second sealing groove and a second sealing ring, the end of the first threaded outer wire and the inner side wall of the female joint are provided with the first sealing groove, the first sealing ring is installed in the first sealing groove, and the end of the female joint and the root of the first threaded outer wire are provided with the second sealing groove, and the second sealing ring is installed in the second sealing groove.

[0011] In at least some embodiments, a split assembly is arranged on the male joint and the female joint, the split assembly comprises a mounting slot hole and a positioning insertion groove, the end of the male joint is provided with the mounting slot hole, the inner side wall of the mounting slot hole is provided with the positioning insertion groove, the assembly ring is fitted and installed in the mounting slot hole, the positioning convex strips are fixedly connected to the four edges of the assembly ring, the positioning convex strips are inserted into the positioning insertion groove, and the second threaded inner wire is formed in the inner side wall of the assembly ring.

[0012] In at least some embodiments, the end of the assembly ring is provided with a limiting inner 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 joint, the other end of the limiting cylinder is fixedly connected with a connecting disc, and the first through hole is formed in the connecting disc.

[0013] In at least some embodiments, the outer side of the male joint of the connecting disc is fixedly connected with a fixed disc, the fixed disc is provided with a second through hole, and bolts are installed in the first through hole and the second through hole.

[0014] In at least some embodiments, one end of the female joint is fixedly connected with a connecting support, the inner side of the connecting support is provided with a third threaded inner wire, and the outer side of the connecting support is provided with a guide slot.

[0015] In at least some embodiments, the outer side of the connecting support is provided with a threaded ring, the outer side of the threaded ring is provided with a third threaded outer wire, the inner side wall of the threaded ring is fixedly connected with a guide plug, and the guide plug is fitted and installed in the guide slot.

[0016] In at least some embodiments, the third threaded inner wire is engaged with a limiting screw cylinder, the end of the limiting screw cylinder is fixedly connected with a pressing convex ring, the pressing convex ring is arranged on the outer side of the guide plug, and the inner side wall of the limiting screw cylinder and the pressing convex ring is provided with a hexagonal slot.

[0017] The low-stress high-torque double-end threaded drill pipe joint provided by the application has the following beneficial effects

[0018] By arranging the reinforcing structure, the stability of the connection between the male joint and the female joint is improved, the loosening of the two caused by high-frequency vibration during drilling is greatly prevented, the accidents such as drilling collapse and drill pipe breakage caused by joint loosening are effectively avoided, the drilling work can be continuously and stably carried out, and the safety and reliability of the work are greatly improved.

[0019] By arranging the double-sealing structure, a double-sealing barrier is effectively formed, the sealing effect is good in the downhole working condition of high pressure, high temperature and complex chemical environment, the leakage of drilling fluid is effectively prevented, the downhole environment is protected, the stability of the drilling fluid performance is ensured, the service life of the drill bit is improved, and the risk of accidents such as sticking is reduced.

[0020] By arranging the split assembly, the threads of the connecting part are designed in a modular manner, the worn threads can be individually disassembled, when the threads are worn due to long-term use, only the corresponding worn threads need to be replaced, the entire joint does not need to be disassembled and replaced, the joint can continue to work normally, the resource waste problem in the traditional overall replacement mode is effectively avoided, the other intact parts of the joint are maximized, the maintenance cost is greatly reduced, the use economy and sustainability of the drill pipe joint are significantly improved, and powerful protection is provided for efficient and low-cost operation of drilling work. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings of the embodiments will be briefly introduced below.

[0022] The accompanying drawings, which are described below, relate to some embodiments of the present application and are not limiting of the present application.

[0023] In the drawings:

[0024] Figure 1 The overall structure is shown according to the present application;

[0025] Figure 2 The sealing structure is shown according to the present application;

[0026] Figure 3 The limiting convex disc structure in the reinforcing structure is shown according to the present application;

[0027] Figure 4 The reinforcing structure partial assembly structure is shown according to the present application;

[0028] Figure 5 The male joint assembly split structure in the split assembly is shown according to the present application;

[0029] Figure 6 The male joint assembly structure in the split assembly is shown according to the present application;

[0030] Figure 7 The female joint assembly split structure in the split assembly is shown according to the present application;

[0031] Figure 8 The female joint assembly structure in the split assembly is shown according to the present application;

[0032] List of reference signs

[0033] 1, male joint;

[0034] 101, first threaded outer thread; 1011, guide cone head;

[0035] 2, female joint;

[0036] 201, first threaded inner thread;

[0037] 3, sealing structure;

[0038] 301, first sealing groove; 3011, first sealing ring;

[0039] 302, second sealing groove; 3021, second sealing ring;

[0040] 4, reinforcing structure;

[0041] 401, limiting convex disc; 4011, limiting insertion slot;

[0042] 402, first outer ring; 4021, second outer ring; 4022, second threaded outer thread; 4023, guide slot; 4024, compression nut;

[0043] 403, movable sliding ring; 4031, guide protrusion; 4032, connecting protrusion; 4033, limiting insertion strip;

[0044] 5, disassembly assembly;

[0045] 501, mounting slot hole; 5011, positioning insertion slot;

[0046] 502, assembly ring; 5021, second threaded inner thread; 5022, positioning protrusion;

[0047] 503, limiting cylinder; 5031, limiting inner ring; 5032, connecting disc; 5033, first through hole;

[0048] 504, fixed disc; 5041, second through hole;

[0049] 505, bolt; 5051, fastening nut;

[0050] 506, connecting strut; 5061, third threaded inner thread; 5062, guide insertion slot;

[0051] 507, threaded ring; 5071, third threaded outer thread; 5072, guide insertion strip;

[0052] 508, limiting screw cylinder; 5081, compression protruding ring; 5082, hexagonal insertion slot. DETAILED DESCRIPTION

[0053] The embodiment is described as follows Figures 1 to 8 :

[0054] The application provides a low-stress high-torque double-end threaded drill rod joint, which comprises a male joint 1, a female joint 2 and a reinforcing structure 4.

[0055] The female joint 2 is arranged at one end of the male joint 1, the first threaded outer thread 101 is arranged at the end of the male joint 1 close to the female joint 2, the end of the first threaded outer thread 101 is provided with a guide taper head 1011, the first threaded inner thread 201 is arranged at the end of the female joint 2 close to the male joint 1, the first threaded inner thread 201 is engaged with the first threaded outer thread 101, the reinforcing structure 4 is arranged on the outer side of the male joint 1 and the female joint 2, and the reinforcing structure 4 comprises:

[0056] The limiting protruding disc 401 is fixedly connected to the outer side of one end of the male joint 1, and limiting insertion slots 4011 are arranged at four edges of the limiting protruding disc 401.

[0057] The first outer ring 402 is fixedly connected to the outer side of the female connector 2, the rear side of the first outer ring 402 is provided with a second outer ring 4021, a second threaded outer wire 4022 is formed on the outer side of the female connector 2 between the first outer ring 402 and the second outer ring 4021, and a compression nut 4024 is engaged on the second threaded outer wire 4022;

[0058] The moving sliding ring 403 is slidingly installed between the first outer ring 402 and the second outer ring 4021, the outer side of the moving sliding ring 403 is fixedly connected with a connecting lug 4032, the connecting lug 4032 is fixedly connected with a limiting insertion strip 4033, and the limiting insertion strip 4033 is inserted into the limiting insertion slot 4011.

[0059] The female connector 2 is provided with a guide groove 4023 between the first outer ring 402 and the second outer ring 4021, and the inner side wall of the moving sliding ring 403 is fixedly connected with a guide lug 4031 which is slidingly installed in the guide groove 4023.

[0060] The sealing structure 3 is arranged between the male connector 1 and the female connector 2, the sealing structure 3 comprises a first sealing groove 301, a first sealing ring 3011, a second sealing groove 302 and a second sealing ring 3021, the end of the first threaded outer wire 101 and the inner side wall of the female connector 2 are provided with the first sealing groove 301, the first sealing ring 3011 is arranged in the first sealing groove 301, and the end of the female connector 2 and the root of the first threaded outer wire 101 are provided with the second sealing groove 302, and the second sealing ring 3021 is arranged in the second sealing groove 302.

[0061] When the drill rod is connected, the guide cone head 1011 of the male connector 1 is aligned with the connecting port of the female connector 2, then the male connector 1 is slowly inserted into the female connector 2, under the action of the guide cone head 1011, the male connector 1 can be quickly and accurately centered, with the deep insertion of the male connector 1, the first threaded outer wire 101 and the first threaded inner wire 201 are gradually engaged, thereby completing the preliminary connection of the male connector 1 and the female connector 2, after the connection is completed, the limiting insertion slot 4011 on the limiting lug plate 401 is aligned with the limiting insertion strip 4033, then the compression nut 4024 is rotated to move under the meshing action of the second threaded outer wire 4022, thereby moving the moving sliding ring 403, finally the moving sliding ring 403 drives the limiting insertion strip 4033 to be inserted into the limiting insertion slot 4011, and the compression nut 4024 compresses and limits the moving sliding ring 403, thereby further reinforcing the two, and finally completing the connection of the male connector 1 and the female connector 2; meanwhile, after the first threaded outer wire 101 and the first threaded inner wire 201 are engaged, the first sealing ring 3011 and the second sealing ring 3021 are deformed by extrusion, so that they are tightly fitted in the first sealing groove 301 and the second sealing groove 302, thereby completing effective double-layer sealing.

[0062] Example two: on the basis of example one, as shown in Figures 5 to 8 The male connector 1 and the female connector 2 are provided with a split assembly 5, the split assembly 5 comprises a mounting slot hole 501 and a positioning slot 5011, the end of the male connector 1 is provided with a mounting slot hole 501, the inner side wall of the mounting slot hole 501 is provided with a positioning slot 5011, a mounting ring 502 is mounted in the mounting slot hole 501, the mounting ring 502 is fixedly connected with a positioning convex strip 5022 at four edges, the positioning convex strip 5022 is inserted and mounted in the positioning slot 5011, and the inner side wall of the mounting ring 502 is provided with a second threaded inner wire 5021.

[0063] The end of the mounting ring 502 is provided with a limiting inner ring 5031, the outer side of the limiting inner ring 5031 is fixedly connected with 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 with a connecting disc 5032, and the connecting disc 5032 is provided with a first through hole 5033.

[0064] The outer side of the male connector 1 on one side of the connecting disc 5032 is fixedly connected with a fixed disc 504, the fixed disc 504 is provided with a second through hole 5041, the first through hole 5033 and the second through hole 5041 are provided with a bolt 505, and the outer side of the bolt 505 is engaged with a fastening nut 5051.

[0065] One end of the female connector 2 is fixedly connected with a connecting support 506, the inner side of the connecting support 506 is provided with a third threaded inner wire 5061, and the outer side of the connecting support 506 is provided with a guide slot 5062.

[0066] The outer side of the connecting support 506 is provided with a threaded ring 507, the outer side of the threaded ring 507 is provided with a third threaded outer wire 5071, the inner side wall of the threaded ring 507 is fixedly connected with a guide insertion strip 5072, and the guide insertion strip 5072 is inserted and mounted in the guide slot 5062.

[0067] The third threaded inner wire 5061 is engaged with a limiting screw cylinder 508, the end of the limiting screw cylinder 508 is fixedly connected with a pressing convex ring 5081, the pressing convex ring 5081 is located on the outer side of the guide insertion strip 5072, and the inner side walls of the limiting screw cylinder 508 and the pressing convex ring 5081 are provided with a hexagonal slot 5082.

[0068] When the threads at the end of the male joint 1 are damaged, the fastening nut 5051 is removed from the bolt 505, the bolt 505 is disassembled, the fixing of the connecting disc 5032 and the fixing disc 504 is released, the limiting cylinder 503 is removed, the limiting of the assembling ring 502 by the limiting inner ring 5031 is released, the assembling ring 502 is pulled out, and the assembling ring 502 is replaced. When assembling, the positioning protrusions 5022 at the four edges of the assembling ring 502 are aligned with the positioning slots 5011, the assembling ring 502 is pushed into the installation slot hole 501, the limiting cylinder 503 is sleeved outside the male joint 1, the first perforation 5033 is aligned with the second perforation 5041, the bolt 505 and the fastening nut 5051 are fastened, and the replacement is completed. When the third thread external thread 5071 on the female joint 2 is damaged, the hexagonal tool is inserted into the hexagonal slot 5082, the limiting cylinder 508 is removed by reverse rotation, the limiting of the guide insertion strip 5072 is released, the thread ring 507 is removed, the guide insertion strip 5072 is inserted into the guide slot 5062, the limiting cylinder 508 is installed by means of the hexagonal tool, the convex ring 5081 is embedded in the front end of the guide insertion strip 5072, the limiting cylinder 508 is limited, and finally the thread ring 507 is installed.

[0069] The specific use and role of the embodiment are as follows: in the application, 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 guide cone head 1011 of the male joint 1 is aligned with the connecting port of the female joint 2, then the male joint 1 is slowly inserted into the female joint 2, under the action of the guide cone head 1011, the male joint 1 can be quickly and accurately centered, with the deep insertion of the male joint 1, the first threaded outer wire 101 and the first threaded inner wire 201 are gradually engaged, when the first threaded outer wire 101 and the first threaded inner wire 201 are engaged, the first sealing ring 3011 and the second sealing ring 3021 are deformed by extrusion, so that they are tightly fitted in the first sealing groove 301 and the second sealing groove 302, thereby completing effective double sealing and the preliminary connection of the male joint 1 and the female joint 2, after the connection is completed, the limiting slot 4011 on the limiting convex disc 401 is aligned with the limiting insert bar 4033, then the movable sliding ring 403 is moved by rotating the compression nut 4024 under the engagement of the second threaded outer wire 4022, so as to push the movable sliding ring 403 to move, finally the movable sliding ring 403 drives the limiting insert bar 4033 to be inserted into the limiting slot 4011, and the compression nut 4024 compresses and limits the movable sliding ring 403, thereby further reinforcing the two, and finally completing the connection of the male joint 1 and the female joint 2, strengthening the stability of the connection of the male joint 1 and the female joint 2, greatly preventing the loosening of the two due to high-frequency vibration during drilling, effectively avoiding serious accidents such as drilling collapse and drill pipe breakage caused by joint loosening, ensuring that the drilling work can continue and be stable, greatly improving the safety and reliability of the operation, then the two ends of the drill pipe joint are connected with the ends of the two groups of drill pipes after the combination is completed, thereby completing the overall assembly, however, when the thread at the end of the male joint 1 is damaged, the fastening nut 5051 is removed from the bolt 505, then the bolt 505 is disassembled, thereby releasing the fixation of the fixing disc 504 and the connecting disc 5032, then the limiting cylinder 503 can be removed, thereby releasing the limitation of the assembly ring 502 by the limiting inner ring 5031, then the assembly ring 502 can be pulled out, thereby the assembly ring 502 can be replaced, during installation, only need to align the positioning convex strip 5022 at the four edges of the assembly ring 502 with the positioning slot 5011, then push the assembly ring 502 into the installation slot hole 501, then put the limiting cylinder 503 outside the male joint 1, so that the first perforation 5033 is aligned with the second perforation 5041, then fasten the two by the cooperation of the bolt 505 and the fastening nut 5051, thereby completing the replacement.When the third thread outer wire 5071 on the female joint 2 is damaged, the limiting screw cylinder 508 is removed by reversing the rotation and inserting the hexagonal tool into the hexagonal slot 5082, thereby releasing the limiting of the guide insertion strip 5072, so that the threaded ring 507 can be removed. When replacing, only need to insert the guide insertion strip 5072 into the guide slot 5062, and then install the limiting screw cylinder 508 with the help of the hexagonal tool, at the same time, the convex ring 5081 is embedded in the front end of the guide insertion strip 5072, thereby limiting it, finally the threaded ring 507 is installed, the threads of the connecting part are designed in a modular way, the worn threads can be removed separately, when the threads are worn due to long-term use, only the corresponding worn threads need to be replaced, without disassembling and replacing the entire joint, the joint can continue to work normally, effectively avoiding the resource waste problem under the traditional overall replacement mode.

Claims

1. A low stress, high torque double-shouldered threaded drill pipe joint comprising: The male connector (1), the female connector (2) and the reinforcing structure (4); One end of the male connector (1) is provided with the female connector (2), one end of the male connector (1) close to the female connector (2) is provided with the first threaded outer wire (101), the end of the first threaded outer wire (101) is provided with the guide cone head (1011), one end of the female connector (2) close to the male connector (1) is provided with the first threaded inner wire (201), the first threaded inner wire (201) is engaged with the first threaded outer wire (101), the outer side of the male connector (1) and the female connector (2) is provided with the reinforcing structure (4), characterized in that the reinforcing structure (4) comprises: The limiting convex disc (401) is fixedly connected to one end of the outer side of the male connector (1), and the limiting convex disc (401) is provided with the limiting insertion slot (4011) at four edges thereof; The first outer ring (402) is fixedly connected to the outer side of the female connector (2), the rear side of the first outer ring (402) is provided with the second outer ring (4021), the outer side of the female connector (2) between the first outer ring (402) and the second outer ring (4021) is provided with the second threaded outer wire (4022), and the second threaded outer wire (4022) is engaged with the compression nut (4024); The movable sliding ring (403) is slidingly installed between the first outer ring (402) and the second outer ring (4021), the outer side of the movable sliding ring (403) is fixedly connected with the connecting convex block (4032) at four edges thereof, the connecting convex block (4032) is fixedly connected with the limiting insertion strip (4033), and the limiting insertion strip (4033) is inserted into the limiting insertion slot (4011); The male connector (1) and the female connector (2) are provided with the disassembly assembly (5), the disassembly assembly (5) comprises an installation slot hole (501) and a positioning insertion slot (5011), one end of the male connector (1) is provided with the installation slot hole (501), the inner side wall of the installation slot hole (501) is provided with the positioning insertion slot (5011), the assembly ring (502) is fitted and installed in the installation slot hole (501), the four edges of the assembly ring (502) are fixedly connected with the positioning convex strip (5022), the positioning convex strip (5022) is inserted into the positioning insertion slot (5011), and the inner side wall of the assembly ring (502) is provided with the second threaded inner wire (5021).

2. A low stress, high torque resistance double shoulder premium thread drill pipe connection according to claim 1, characterized in that: The guiding groove (4023) is formed in the female connector (2) between the first outer ring (402) and the second outer ring (4021), the inner side wall of the movable sliding ring (403) is fixedly connected with the guide convex block (4031), and the guide convex block (4031) is slidingly installed in the guiding groove (4023).

3. A low stress, high torque resistance double shoulder premium thread drill pipe connection according to claim 1, characterized in that: The male joint (1) and the female joint (2) are provided with a sealing structure (3), the sealing structure (3) comprises a first sealing groove (301), a first sealing ring (3011), a second sealing groove (302) and a second sealing ring (3021), the end of the first threaded outer wire (101) is provided with the first sealing groove (301) on the inner side wall of the female joint (2), the first sealing groove (301) is internally provided with the first sealing ring (3011), and the end of the female joint (2) and the root of the first threaded outer wire (101) are provided with the second sealing groove (302), and the second sealing groove (302) is internally provided with the second sealing ring (3021).

4. A low stress, high torque resistance double shoulder premium thread drill pipe connection according to claim 1, characterized in that: The end of the assembling ring (502) is provided with a limiting inner ring (5031), the outer side of the limiting inner ring (5031) is fixedly connected with one end of a limiting barrel (503), the limiting barrel (503) is installed on the outer side of the male joint (1), and the other end of the limiting barrel (503) is fixedly connected with a connecting disc (5032), and the connecting disc (5032) is provided with a first perforation (5033).

5. A low stress, high torque resistance double shoulder premium thread drill pipe connection according to claim 4, characterized in that: The outer side of the connecting disc (5032) is fixedly connected with a fixed disc (504) on one side of the male joint (1), the fixed disc (504) is provided with a second perforation (5041), and the first perforation (5033) and the second perforation (5041) are provided with a bolt (505), and the outer side of the bolt (505) is engaged with a fastening nut (5051).

6. A low stress, high torque resistance double shoulder premium thread drill pipe connection according to claim 1, characterized in that: One end of the female joint (2) is fixedly connected with a connecting support (506), the inner side of the connecting support (506) is provided with a third threaded inner wire (5061), and the outer side of the connecting support (506) is provided with a guide insertion slot (5062).

7. A low stress, high torque resistance double shoulder premium thread drill pipe connection according to claim 6, characterized in that: The outer side of the connecting support (506) is provided with a threaded ring (507), the outer side of the threaded ring (507) is provided with a third threaded outer wire (5071), the inner side wall of the threaded ring (507) is fixedly connected with a guide insertion strip (5072), and the guide insertion strip (5072) is inserted into the guide insertion slot (5062).

8. A low stress, high torque resistance double shoulder premium thread drill pipe connection according to claim 7, characterized in that: The third threaded inner wire (5061) is engaged with a limiting screw barrel (508), one end of the limiting screw barrel (508) is fixedly connected with a pressing convex ring (5081), the pressing convex ring (5081) is arranged on the outer side of the guide insertion strip (5072), and the inner side wall of the limiting screw barrel (508) and the pressing convex ring (5081) is provided with a hexagonal insertion slot (5082).

Images