Well drilling casing pipe with good wear resistance

Abstract

The utility model belongs to the technical field of well drilling equipment, and particularly relates to a well drilling casing pipe with good abrasion resistance, which comprises a plurality of well drilling casing pipe main bodies, connecting assemblies are arranged at the opposite ends of the adjacent well drilling casing pipe main bodies, and each connecting assembly comprises a middle pipe and a threaded connector. Threaded grooves are formed in the upper end and the lower end of the middle pipe correspondingly, the threaded connectors are fixedly connected with the well casing pipe body, the threaded connectors are in threaded connection with the threaded grooves, fixing assemblies are installed on the middle pipe and the well casing pipe body, and each fixing assembly comprises an installation cavity and a plurality of fixing grooves. The mounting cavity is formed in the surface of the middle pipe; according to the utility model, the threaded connectors are connected with the threaded grooves, the adjacent well casing main bodies are assembled and connected through the middle pipes, and the fixing rods are inserted into the fixing grooves, so that the influence of looseness of the middle pipes on the assembling stability can be effectively prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling equipment, in particular to a drilling casing with good wear resistance. Background Art

[0002] Drilling rig casing needs to be spliced ​​to increase its length when in use. The common connection method is referred to in CN201120086454.7. Usually, an external thread male end is set at one end of the pipe body, and a threaded female end matching it is set at the adjacent pipe body, and the threaded connection is achieved by relative rotation of the two pipe bodies.

[0003] However, the length of the drilling casing is usually several meters or even more than ten meters, and it is heavy. It is relatively difficult to directly thread the two pipe bodies, and the requirements for equipment and personnel are relatively high. Therefore, it is necessary to study new connection structures to reduce the difficulty of installing drilling casing.

[0004] The existing Chinese patent with announcement number CN220726209U discloses a drilling casing connection structure, including: two drilling casings and a butt-joint pipe group for connecting the two drilling casings; the ends of the drilling casings are provided with an external spline structure and an external thread structure; the butt-joint pipe group includes: an intermediate pipe and two joint pipes; the two ends of the intermediate pipe are respectively connected to the two drilling casings through the two joint pipes; the two ends of the intermediate pipe are respectively formed with two butt-joint holes for inserting the ends of the two drilling casings; the hole wall of the butt-joint hole is provided with an internal spline structure for forming a spline connection with the external spline structure; the two ends of the intermediate pipe are also respectively formed with intermediate pipe limit blocks; the joint pipe is arranged on the outside of the whole formed by the drilling casing and the intermediate pipe; one end of the joint pipe is formed with an internal thread structure for forming a threaded connection with the external thread structure; the other end of the joint pipe is formed with a joint pipe limit block.

[0005] In view of the above-mentioned and existing related technologies, the inventors believe that the following defects often exist: the rotating joint pipe of the device utilizes the connection of the external thread structure and the internal thread structure to lock the drilling casing and the intermediate pipe in the axial direction, but the rotating joint pipe is located on the outside and is easily loosened by external forces, which needs to be improved; therefore, a drilling casing with good wear resistance is proposed to address the above problems. Utility Model Content

[0006] In order to make up for the deficiencies of the prior art and solve the above-mentioned technical problems, the utility model provides a drilling casing with good wear resistance.

[0007] The utility model adopts the following technical scheme to solve the technical problem: the utility model discloses a drilling casing with good wear resistance, comprising a plurality of drilling casing main bodies, a connecting assembly is installed at the opposite end of the adjacent drilling casing main bodies, the connecting assembly comprises an intermediate pipe and a threaded connector, the upper and lower ends of the intermediate pipe are respectively provided with threaded grooves, the threaded connector is fixedly connected with the drilling casing main body, the threaded connector is threadedly connected with the threaded groove, a fixing assembly is installed on the intermediate pipe and the drilling casing main body, the fixing assembly comprises an installation cavity and a plurality of fixing grooves, the installation cavity is provided on the surface of the intermediate pipe, an air bag is fixedly connected inside the installation cavity, the air bag is installed inside the installation cavity to avoid damage, the upper and lower ends of the air bag are respectively provided with fixing rods, the fixing rod passes through the intermediate pipe and extends to the outside, the fixing groove is provided at one end of the drilling casing main body, during assembly, the threaded connector is connected with the threaded groove, adjacent drilling casing main bodies are assembled and connected through the intermediate pipe, and the fixing rod is inserted into the fixing groove, which can effectively prevent the intermediate pipe from loosening and affecting the stability of assembly.

[0008] Preferably, the number and positions of the fixing rods and fixing slots correspond to each other.

[0009] Preferably, connecting rings are installed at the upper and lower parts of the installation cavity respectively, one end of the fixing rod is fixedly connected to the connecting ring, and the connecting ring is lifted up by the expansion of the airbag so that the fixing rod is inserted into the fixing groove.

[0010] Preferably, a connecting port is provided on the side wall of the intermediate tube, and an inflatable nozzle is installed on the surface of the airbag. During installation, the airbag is deflated, and the fixing rod is kept in the cavity by the tension of the spring to prevent the fixing rod from affecting the rotational docking between the drilling casing body and the intermediate tube. After the connection is completed, the airbag is inflated by the inflatable nozzle, and the connecting ring is lifted by the expansion of the airbag, so that the fixing rod is inserted into the fixing groove. When disassembly is required at a later time, the inflatable nozzle can be opened to deflate the air, so that the fixing rod can withdraw from the fixing groove, and the drilling casing body and the intermediate tube can be quickly disassembled.

[0011] Preferably, the fixing assembly further comprises two upper and lower cavities, the cavities are respectively opened at the upper and lower parts of the middle tube, and the fixing rod passes through the cavities.

[0012] Preferably, the surface of the fixing rod protrudes outward to form a limiting layer.

[0013] Preferably, a spring is sleeved on the surface of the fixing rod.

[0014] Preferably, the intermediate tube is made of wear-resistant polyurethane material to improve the wear resistance.

[0015] The utility model is beneficial in that:

[0016] 1. The utility model connects the threaded connector with the threaded groove, assembles and connects adjacent drilling casing bodies through the intermediate pipe, and inserts the fixing rod into the fixing groove, which can effectively prevent the intermediate pipe from loosening and affecting the stability of the assembly.

[0017] 2. The utility model can release air by opening the inflation nozzle, so that the fixing rod can withdraw from the fixing groove, and the drilling casing body and the intermediate pipe can be quickly disassembled or installed. After the connection is completed, the air bag is inflated through the inflation nozzle, and the connecting ring is lifted up by the expansion of the air bag, so that the fixing rod can be inserted into the interior of the fixing groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 This is a cross-sectional view of the main body of the drilling casing of the utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the connection assembly of the utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the fixed component of the utility model;

[0023] Figure 5 For this utility model Figure 4 Schematic diagram of the A structure.

[0024] In the figure: 1. Drilling casing body; 2. Connecting assembly; 21. Intermediate pipe; 22. Threaded connector; 3. Fixing assembly; 31. Mounting cavity; 32. Air bag; 33. Fixing rod; 34. Connecting ring; 35. Cavity; 36. Fixing groove; 37. Limiting layer; 38. Spring; 4. Connecting port; 5. Inflatable nozzle. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Embodiment 1

[0027] See also Figure 1-5 As shown, a drilling casing with good wear resistance includes a plurality of drilling casing bodies 1, and a connecting assembly 2 is installed at the opposite end of the adjacent drilling casing bodies 1. The connecting assembly 2 includes an intermediate pipe 21 and a threaded connector 22. The upper and lower ends of the intermediate pipe 21 are respectively provided with threaded grooves. The threaded connector 22 is fixedly connected to the drilling casing body 1. The threaded connector 22 is threadedly connected to the threaded groove. A fixing assembly 3 is installed on the intermediate pipe 21 and the drilling casing body 1. The fixing assembly 3 includes an installation cavity 31 and a plurality of fixing grooves 36. The installation cavity 31 is provided at the intermediate pipe 21. On the surface, the inside of the installation cavity 31 is fixedly connected with an airbag 32, and the airbag 32 is installed in the inside of the installation cavity 31 to avoid damage. The upper and lower ends of the airbag 32 are respectively installed with fixing rods 33, which penetrate the intermediate tube 21 and extend to the outside. The fixing groove 36 is opened at one end of the drilling casing body 1. During assembly, the threaded connector 22 is connected to the threaded groove, and the adjacent drilling casing bodies 1 are assembled and connected through the intermediate tube 21. The fixing rod 33 is inserted into the fixing groove 36, which can effectively prevent the intermediate tube 21 from loosening and affecting the stability of the assembly.

[0028] The number and positions of the fixing rods 33 and the fixing grooves 36 correspond to each other.

[0029] Connecting rings 34 are installed at the upper and lower parts of the installation cavity 31 , and one end of the fixing rod 33 is fixedly connected to the connecting ring 34 . The connecting ring 34 is lifted up by the expansion of the airbag 32 , so that the fixing rod 33 is inserted into the fixing groove 36 .

[0030] A connecting port 4 is provided on the side wall of the intermediate tube 21, and an inflatable nozzle 5 is installed on the surface of the airbag 32. During installation, the airbag 32 is deflated, and the fixing rod 33 is kept in the cavity 35 by the tension of the spring 38 to prevent the fixing rod 33 from affecting the rotational docking between the drilling casing body 1 and the intermediate tube 21. After the connection is completed, the airbag 32 is inflated by the inflatable nozzle 5, and the connecting ring 34 is lifted up by the expansion of the airbag 32, so that the fixing rod 33 is inserted into the fixing groove 36. When disassembly is required later, the inflatable nozzle 5 can be opened to deflate the air, so that the fixing rod 33 withdraws from the fixing groove 36, and the drilling casing body 1 and the intermediate tube 21 can be quickly disassembled.

[0031] The fixing assembly 3 further includes two upper and lower cavities 35 . The cavities 35 are respectively opened at the upper and lower parts of the middle tube 21 , and the fixing rod 33 passes through the cavities 35 .

[0032] The surface of the fixing rod 33 protrudes outward to form a limiting layer 37 .

[0033] A spring 38 is sleeved on the surface of the fixing rod 33 .

[0034] The middle pipe 21 is made of wear-resistant polyurethane material to improve the wear resistance.

[0035] Working principle: during assembly, the threaded connector 22 is connected to the threaded groove, and the adjacent drilling casing bodies 1 are assembled and connected through the intermediate tube 21. After the connection is completed, the air bag 32 is inflated through the inflation nozzle 5, and the connecting ring 34 is lifted up by the expansion of the air bag 32, so that the fixing rod 33 is inserted into the inside of the fixing groove 36. When disassembly is required later, the inflation nozzle 5 can be opened to deflate the air, so that the fixing rod 33 withdraws from the fixing groove 36, and the drilling casing body 1 and the intermediate tube 21 can be quickly disassembled.

[0036] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0037] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A drilling casing with good wear resistance, comprising a plurality of drilling casing bodies (1), characterized in that: A connecting assembly (2) is installed at the opposite end of the adjacent drilling casing body (1), the connecting assembly (2) comprising an intermediate tube (21) and a threaded connector (22), the upper and lower ends of the intermediate tube (21) are respectively provided with threaded grooves, the threaded connector (22) is fixedly connected to the drilling casing body (1), the threaded connector (22) is threadedly connected to the threaded groove, a fixing assembly (3) is installed on the intermediate tube (21) and the drilling casing body (1), the fixing assembly (3) comprising a mounting cavity (31) and a plurality of fixing grooves (36), the mounting cavity (31) is provided on the surface of the intermediate tube (21), an air bag (32) is fixedly connected to the inside of the mounting cavity (31), fixing rods (33) are respectively installed at the upper and lower ends of the air bag (32), the fixing rods (33) penetrate the intermediate tube (21) and extend to the outside, and the fixing groove (36) is provided at one end of the drilling casing body (1).

2. The wear-resistant drilling casing according to claim 1, characterized in that: The number and positions of the fixing rods (33) and the fixing grooves (36) correspond to each other.

3. The wear-resistant drilling casing according to claim 1, characterized in that: Connecting rings (34) are respectively installed at the upper and lower parts of the installation cavity (31), and one end of the fixing rod (33) is fixedly connected to the connecting ring (34).

4. The wear-resistant drilling casing according to claim 1, characterized in that: A connecting port (4) is provided on the side wall of the intermediate tube (21), and an inflating nozzle (5) is installed on the surface of the air bag (32).

5. The wear-resistant drilling casing according to claim 1, characterized in that: The fixing assembly (3) further comprises two upper and lower cavities (35), wherein the cavities (35) are respectively opened at the upper and lower parts of the intermediate tube (21), and the fixing rod (33) passes through the cavities (35).

6. The wear-resistant drilling casing according to claim 1, characterized in that: The surface of the fixing rod (33) protrudes outwards to form a limiting layer (37).

7. The wear-resistant drilling casing according to claim 1, characterized in that: A spring (38) is sleeved on the surface of the fixing rod (33).

8. The wear-resistant drilling casing according to claim 1, characterized in that: The intermediate tube (21) is made of polyurethane wear-resistant material.

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