Butt welding joint for drill rod

Abstract

The utility model relates to a drill rod butt welding joint, which belongs to drill rod joints and is characterized in that drill rods are welded at the top and the bottom of a joint, an anti-falling component is arranged on the outer wall of the joint and comprises a protective plate, insertion holes are formed in the drill rods, insertion rods are inserted into the insertion holes, first insertion holes are formed in the upper portion of the protective plate, and second insertion holes are formed in the lower portion of the protective plate. One end of the insertion rod penetrates through the insertion hole I and is fastened by a nut I; a positioning insertion block is fixed to the lower portion of one side face of the protective plate, a second insertion hole is formed in the positioning insertion block and penetrates through the lower portion of the protective plate, two threaded rods are fixed to the outer wall of the connector and penetrate through the second insertion hole, and second nuts are connected to the outer walls of the threaded rods in a threaded mode. According to the device, the situation that a drill rod or a drill bit below falls off can be avoided, the positioning insertion block and the positioning block are matched to play a supporting role, the broken drill rod or drill bit can be smoothly pulled out for well drilling, and replacement or maintenance is convenient; after being installed, the guard plate is tightly attached to the connector and the drill rod, so that the welding position between the drill rod and the connector is not prone to breakage.

Description

Technical Field

[0001] The utility model belongs to a drill pipe joint, and particularly relates to a butt-welding joint of a drill pipe. Background Art

[0002] The butt-welding joint of a drill pipe plays a crucial role in oil drilling. It not only involves technical specifications and manufacturing processes, but also is directly related to the service life of the drill pipe and the safety and efficiency of the drilling project.

[0003] After retrieval, a Chinese patent with the publication number CN 208900032 U and the name of a welded drill pipe with a flat-end joint has the advantages of simple structure, low cost, light product weight, small drilling friction resistance, and low processing difficulty. It is easy to operate, reduces the investment in supporting equipment, and is convenient for use in oil drilling; however, this structure does not have a reinforcement structure, which easily leads to the fracture of the welding part after long-term use, and easily causes the drill bit and the like to fall into the well, thus affecting the normal operation of drilling; another example is a Chinese patent with the publication number CN 213980681 U and the name of a small-joint friction-welded titanium alloy drill pipe. The pipe body size at the friction-welding position of the second cylindrical section is the same as the joint size, which can effectively reduce the outer diameter and wall thickness of the pipe body of the first cylindrical section, reduce the outer diameter of the second cylindrical section. Through the design of a small-taper double-shoulder joint thread, the torsional strength of the thread connection can be improved, the water hole diameter of the drill pipe can be increased, the outer diameter of the drill pipe joint can be reduced, the cost of the titanium alloy drill pipe can be reduced, and the applicability of the drill pipe in small-hole drilling conditions can be improved; however, when the welding part of this structure breaks, it will cause the drill pipe to fall, resulting in the problem that it is not easy to remove the broken drill pipe subsequently, thus affecting the normal operation of drilling. Content of the Utility Model

[0004] The utility model provides a butt-welding joint of a drill pipe to solve the deficiencies of the prior art.

[0005] A butt-welding joint of a drill pipe of the utility model comprises a connecting head, drill pipes are welded at the top and bottom of the connecting head respectively, anti-falling components are arranged on the outer walls of two symmetrical sides of the connecting head respectively, each anti-falling component comprises a guard plate, the guard plate is an arc-shaped plate, and the arc-shaped concave surface thereof contacts with the outer surface of the drill pipe. A socket is formed inside the drill pipe, a plug rod is inserted into the socket, a socket one is formed in the upper part of the guard plate, one ends of the plug rods respectively pass through the socket ones on the guard plates on both sides of the drill pipe and are fastened with a nut one; a positioning plug block is fixedly connected to the lower part of one side surface of the guard plate close to the connecting head, a socket two is formed inside the positioning plug block, the socket two penetrates through the lower part of the guard plate, two threaded rods are fixedly connected to the outer walls of two symmetrical sides of the connecting head at intervals respectively, the threaded rods pass through the socket two and are threadedly connected with a nut two on the outer walls thereof.

[0006] As a further improvement of the present utility model, positioning blocks are provided on the connecting heads above and below each of the threaded rods. The positioning plug is placed between the two positioning blocks at the upper and lower ends of the threaded rod and is inserted therewith. The end face of the positioning plug away from the protective plate is in contact with the surface of the connecting head.

[0007] As a further improvement of the present utility model, one end of the insertion rod is fixedly connected with a limiting block, and the outer wall surface of the other end is provided with threads. A first nut is threadedly connected to the threaded portion of the insertion rod, and the side of the limiting block close to the protective plate is in contact with the surface of the protective plate.

[0008] As a further improvement of the present utility model, the side surface of the positioning block close to the protective plate is an arc surface, and the arc surface on the positioning block is adapted to the arc-shaped recess on the protective plate.

[0009] As a further improvement of the present utility model, the lower part of the outer side wall of the protective plate is provided with a flat surface, and the side surface of the second nut close to the protective plate is in contact with this flat surface.

[0010] A butt welding joint of a drill pipe of the present utility model has a reasonable structural design. By setting the anti-falling component, when the welded joint between the drill pipe and the connecting head breaks, since the protective plate is installed on the connecting head and the insertion rod is inserted into the insertion hole on the drill pipe at the same time, the connecting head can be supported, so that the drill pipe or drill bit below can be prevented from falling, and the positioning plug can play a supporting role again through the cooperation with the positioning block, and the broken drill pipe or drill bit can be smoothly pulled out of the drilling well, which is convenient for subsequent replacement or maintenance; by setting the insertion rod, specifically, when in use, the protective plate will be in close contact with the connecting head and the drill pipe after installation, so as to disperse the vibration force and torsional force received by it to the insertion rod and the protective plate, thereby reducing the impact force, improving the service life, and making the welded joint between the drill pipe and the connecting head not easy to break. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a structural schematic diagram of the present utility model;

[0012] Figure 2 is a partial structural schematic diagram of the present utility model;

[0013] Figure 3 is a structural schematic diagram of the drill pipe of the present utility model;

[0014] Figure 4 is a structural schematic diagram of the protective plate of the present utility model;

[0015] Figure 5 is a structural schematic diagram of the connecting head of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] A butt welding joint for drill pipes of the utility model includes a connector 1. Drill pipes 11 are welded to both the top and bottom of the connector 1. An insertion hole 111 is formed inside the drill pipe 11. A plug rod 122 is inserted into the insertion hole 111. A limit block 221 is fixedly connected to one end of the plug rod 122, and threads are provided on the outer wall surface of the other end. A first nut 222 is threadedly connected to the threaded portion of the plug rod 122.

[0017] Anti-falling components 12 are respectively arranged on the outer walls on both sides of the connector 1 that are symmetrical to each other. The anti-falling component 12 includes a guard plate 121. The guard plate 121 is an arc-shaped plate, and its arc-shaped concave surface contacts the outer surface of the drill pipe 11. A first insertion hole 211 is formed in the upper part of the guard plate 121. One end of the plug rod 122 passes through the first insertion holes 211 on the guard plates 121 on both sides of the drill pipe 11 and the insertion hole 111, and is fastened with the first nut 222. At this time, the side surface of the limit block 221 close to the guard plate 121 contacts the surface of the guard plate 121.

[0018] A positioning plug 212 is fixedly connected to the lower part of the side surface of the guard plate 121 close to the connector 1. A second insertion hole 213 is formed inside the positioning plug 212, and the second insertion hole 213 penetrates through the lower part of the guard plate 121. Two threaded rods 13 are respectively and spacedly fixedly connected to the outer walls on both sides of the connector 1 that are symmetrical to each other. The threaded rods 13 pass through the second insertion holes 213, and a second nut 131 is threadedly connected to the outer walls thereof. A plane is provided on the lower part of the outer side wall of the guard plate 121, and the side surface of the second nut 131 close to the guard plate 121 contacts this plane, which can increase the contact area between the second nut 131 and the guard plate 121 and improve the fixing effect. Positioning blocks 14 are arranged on the connector 1 above and below each threaded rod 13. The side surface of the positioning block 14 close to the guard plate 121 is an arc-shaped surface, and the arc-shaped surface on the positioning block 14 is adapted to the arc-shaped concave surface on the guard plate 121. The positioning plug 212 is placed between the two positioning blocks 14 at the upper and lower ends of the threaded rod 13 and is inserted together with them, playing a role in positioning the positioning plug 212. The end surface of the positioning plug 212 far from the guard plate 121 contacts the surface of the connector 1.

[0019] When the utility model is in use, first weld the two ends of the connector 1 to the ends of two drill pipes 11 respectively. After the welding is completed, insert the threaded rod 13 into the second jack 213. At the same time, insert the positioning plug 212 between the two positioning blocks 14 on both sides of the threaded rod 13 to limit the guard plate 121. Then, fix the guard plate 121 with the second nut 131. At this time, the first jack 211 on the guard plate 121 corresponds to the jack 111. Then, insert one end of the insertion rod 122 into the first jack 211 and the jack 111 on the guard plate 121 and fasten it with the first nut 222; this installation method can disperse the vibration force and torsion force received by the drill pipe 11 during use to the insertion rod 122 and the guard plate 121, reduce the impact force, improve the service life, and make the welded joint between the drill pipe 11 and the connector 1 not easy to break. When the welded joint between the drill pipe 11 and the connector 1 breaks, the guard plate 121 can also support the connector 1, so as to avoid the situation that the drill pipe 11 or the drill bit below drops. At the same time, the positioning plug 212 can also play a supporting role through the cooperation with the positioning block 14, and can smoothly pull out the broken drill pipe 11 or drill bit from the drilling well, facilitating subsequent replacement or maintenance.

Claims

1. A drill pipe butt welding joint, comprising a connecting head (1), drill pipes (11) are welded to both the top and bottom of the connecting head (1), and anti-falling components (12) are respectively arranged on the outer walls of two symmetrical sides of the connecting head (1), characterized in that, The anti-falling component (12) includes a guard plate (121). The guard plate (121) is an arc-shaped plate, and its arc-shaped concave surface contacts the outer surface of the drill pipe (11). A socket (111) is provided inside the drill pipe (11), and a plug rod (122) is inserted into the socket (111). A first socket (211) is provided in the upper part of the guard plate (121). One end of the plug rod (122) passes through the first sockets (211) on the guard plates (121) on both sides of the drill pipe (11) and is fastened with a first nut (222); A positioning plug (212) is fixedly connected to the lower part of the side surface of the guard plate (121) close to the connector (1). A second socket (213) is provided inside the positioning plug (212), and the second socket (213) penetrates the lower part of the guard plate (121). Two threaded rods (13) are respectively and spaced fixedly connected to the outer walls on both sides of the connector (1) symmetrically. The threaded rods (13) pass through the second sockets (213) and are threadedly connected with second nuts (131) on their outer walls.

2. The butt welding joint of drill pipes according to claim 1, characterized in that, Positioning blocks (14) are provided on the connector (1) above and below each of the threaded rods (13). The positioning plug (212) is placed between the two positioning blocks (14) at the upper and lower ends of the threaded rod (13) and is inserted together with them. The end face of the positioning plug (212) away from the guard plate (121) contacts the surface of the connector (1).

3. The butt-welding joint of a drill pipe according to claim 1, wherein, One end of the plug rod (122) is fixedly connected with a limit block (221), and the outer wall surface of the other end is provided with threads. A first nut (222) is threadedly connected to the threaded part of the plug rod (122). The side of the limit block (221) close to the guard plate (121) contacts the surface of the guard plate (121).

4. The butt-welding joint of a drill pipe according to claim 2, characterized in that, The side surface of the positioning block (14) close to the guard plate (121) is an arc-shaped surface, and the arc-shaped surface on the positioning block (14) is adapted to the arc-shaped concave surface on the guard plate (121).

5. The butt welded joint of drill pipe according to claim 1, characterized in that, The lower part of the outer side wall of the guard plate (121) is provided with a plane, and the side surface of the second nut (131) close to the guard plate (121) contacts this plane.

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