Threaded joint and coupling of pipeline pipe

Abstract

The utility model discloses a pipeline pipe screwed joint and coupling, which comprises a casing coupling and a casing body, the tail end of the casing coupling is sequentially provided with a reverse shoulder, a first transition surface and an arc bulge from the outer side to the inner side along the radial direction; the position, corresponding to the tail end of the casing coupling, of a threaded connector of the casing body is sequentially provided with a reverse inclined abutting face, a first transition arc face and an arc groove from the outer side to the inner side in the radial direction. Wherein buttress external threads are arranged on the outer wall of the casing pipe body, buttress internal threads matched with the buttress external threads are arranged on the inner wall of the casing pipe coupling, and when the buttress internal threads of the casing pipe coupling are completely meshed with the buttress external threads of the casing pipe body, the buttress external threads of the casing pipe coupling are meshed with the buttress external threads of the casing pipe body. The reverse circular bead abuts against the reverse inclined abutting face to form a first sealing face, the arc protrusion is matched with the arc groove to form a second sealing arc face, the sealing performance can be improved, and external substances are prevented from permeating.

Description

Technical Field

[0001] This utility model relates to a pipeline threaded joint and coupling, belonging to the field of oil and gas well drilling and extraction technology. Background Technology

[0002] Currently, pipeline pipes are widely used in the transportation of fluids such as oil and natural gas. Their main function is to be run down into the well along with the oil and gas well to ensure the stability and sealing of the transportation pipeline.

[0003] After searching the existing technology, Chinese patent CN107956431A was found to disclose an oil casing coupling. This patent adds a positioning groove and a sealing section to the oil casing coupling, improving the sealing performance and connection stability of the coupling. However, during use, it was found that due to factors such as external pressure and temperature changes, external substances such as moisture and impurities may still seep into the connection from the end of the coupling, leading to cross-contamination of the internal and external environments of the pipeline, and thus affecting the overall sealing performance of the pipeline system. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a pipeline threaded joint and coupling that can improve sealing performance and prevent the infiltration of external substances.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: a pipeline threaded joint and coupling, comprising:

[0006] The sleeve coupling has a reverse shoulder, a first transition surface and an arc protrusion arranged in sequence from the outside to the inside in the radial direction at its end.

[0007] The sleeve body has a reverse oblique abutment surface, a first transition arc surface and a circular arc groove arranged in the radial direction from the outside to the inside at the position corresponding to the end of the sleeve coupling of the threaded joint of the sleeve body.

[0008] The outer wall of the sleeve body is provided with a trapezoidal external thread, and the inner wall of the sleeve coupling is provided with a trapezoidal internal thread that matches the trapezoidal external thread. When the trapezoidal internal thread of the sleeve coupling is fully engaged with the trapezoidal external thread of the sleeve body, the reverse shoulder and the reverse oblique abutment surface abut together to form a first sealing surface, the arc protrusion and the arc groove cooperate to form a second sealing arc surface, and a gap is formed between the first transition surface of the sleeve coupling and the first transition arc surface of the sleeve body.

[0009] Furthermore, the anti-shoulder includes a first outer plane disposed on the outer wall of the sleeve coupling and a second plane connected to the first outer plane disposed on the end of the sleeve coupling, wherein:

[0010] The first outer plane is parallel to the axial direction of the sleeve coupling;

[0011] The angle between the second plane and the first outer plane is 60°-90°.

[0012] Furthermore, the trapezoidal internal thread of the sleeve coupling is an NPT thread with a thread density of 11.5 TPI.

[0013] Furthermore, the taper of both the trapezoidal external thread of the sleeve body and the trapezoidal internal thread of the sleeve coupling is 1:16.

[0014] Furthermore, the outer diameter of the sleeve body is 33.4 mm.

[0015] Furthermore, the outer diameter of the sleeve coupling is 40 mm.

[0016] Furthermore, the surface roughness of both the trapezoidal external thread of the sleeve body and the trapezoidal internal thread of the sleeve coupling is no greater than Ra3.2 micrometers.

[0017] Furthermore, to prevent rust spots from appearing, the trapezoidal internal thread surface of the sleeve coupling is provided with an anti-rust paint layer.

[0018] By adopting the above technical solution, this utility model has the following beneficial effects:

[0019] In this invention, when the trapezoidal internal thread of the sleeve coupling is fully engaged with the trapezoidal external thread of the sleeve body, the reverse shoulder and the reverse oblique abutment surface abut against each other, forming a first sealing surface. The first sealing surface forms a certain angle with the radial direction, and the meshing force of the threads tightly abuts the two surfaces, effectively preventing the infiltration of external liquids or gases. Furthermore, the cooperation of the arc-shaped protrusion and the arc-shaped groove forms a second sealing arc surface, providing additional sealing protection for the connection. Through the combined effect of these two sealing structures, the sealing performance of the connection is improved, avoiding leakage caused by gaps at the threaded connection.

[0020] Furthermore, the surface roughness of the threads on both the casing body and the casing coupling is no greater than Ra 3.2 micrometers, further improving the meshing accuracy and the smoothness of the contact surface, reducing frictional resistance during installation, and extending service life. Simultaneously, the anti-rust paint layer on the inner thread surface of the casing coupling enhances rust prevention performance and improves product quality.

[0021] In summary, this invention not only significantly improves the sealing performance of threaded joints and prevents the infiltration of external substances, but also enhances the connection stability and durability of the joints, thus possessing promising application prospects. Attached Figure Description

[0022] Figure 1This is a schematic diagram of the pipeline threaded joint and coupling of this utility model.

[0023] Figure 2 for Figure 1 A magnified view of part A in the middle;

[0024] Figure 3 This is a schematic diagram of the pipe threaded joint and coupling sleeve body of the present invention.

[0025] Figure 4 This is a schematic diagram of the pipe threaded joint and the sleeve coupling of the present invention. Detailed Implementation

[0026] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0027] like Figure 1-4 As shown, a pipeline threaded joint and coupling include:

[0028] The sleeve coupling 1 has a reverse shoulder, a first transition surface 12 and an arc protrusion arranged in sequence from the outside to the inside in the radial direction at its end.

[0029] The sleeve body 2, the threaded joint of the sleeve body 2 and the end of the sleeve coupling 1 are provided with a reverse oblique abutment surface, a first transition arc surface 22 and an arc groove in the radial direction from the outside to the inside.

[0030] The outer wall of the sleeve body 2 is provided with a trapezoidal external thread, and the inner wall of the sleeve coupling 1 is provided with a trapezoidal internal thread that matches the trapezoidal external thread. When the trapezoidal internal thread of the sleeve coupling 1 is fully engaged with the trapezoidal external thread of the sleeve body 2, the reverse shoulder and the reverse oblique abutment surface abut together to form a first sealing surface 31, and the arc protrusion and the arc groove cooperate to form a second sealing arc surface 32. A gap is formed between the first transition surface 12 of the sleeve coupling 1 and the first transition arc surface 22 of the sleeve body 2.

[0031] In this embodiment, as Figure 1-4 As shown, when the trapezoidal internal thread of the sleeve coupling 1 fully engages with the trapezoidal external thread of the sleeve body 2, the reverse shoulder and the reverse oblique abutment surface abut against each other, forming a first sealing surface 31. The first sealing surface 31 forms a certain angle with the radial direction, and the meshing force of the threads tightly abuts the two, thereby effectively preventing the infiltration of external liquids or gases. In addition, the cooperation of the arc protrusion and the arc groove forms a second sealing arc surface 32, providing additional sealing protection for the connection. Through the combined action of these two sealing structures, the sealing performance of the connection is improved, avoiding leakage caused by gaps at the threaded connection.

[0032] Specifically, such as Figure 1 and Figure 4 As shown, the anti-shoulder includes a first outer plane disposed on the outer wall of the sleeve coupling 1 and a second plane connected to the first outer plane disposed on the end of the sleeve coupling 1, wherein:

[0033] The first outer plane is parallel to the axial direction of the sleeve coupling 1;

[0034] The angle between the second plane and the first outer plane is 60°-90°.

[0035] Specifically, such as Figure 1 and Figure 4 As shown, the trapezoidal internal thread of sleeve coupling 1 is an NPT thread with a thread density of 11.5TPI.

[0036] Specifically, such as Figure 1 and Figure 3-4 As shown, the taper of the trapezoidal external thread of the sleeve body 2 and the trapezoidal internal thread of the sleeve coupling 1 are both 1:16.

[0037] Specifically, such as Figure 1 and Figure 3 As shown, the outer diameter of the sleeve body 2 is 33.4 mm.

[0038] Specifically, such as Figure 1 and Figure 4 As shown, the outer diameter of sleeve coupling 1 is 40 mm.

[0039] Specifically, such as Figure 1 and Figure 3-4 As shown, the surface roughness of the trapezoidal external thread of the sleeve body 2 and the trapezoidal internal thread of the sleeve coupling 1 is no greater than Ra 3.2 micrometers.

[0040] Specifically, such as Figure 1 and Figure 4 As shown, the trapezoidal internal thread surface of the sleeve coupling 1 is provided with a rust-proof paint layer.

[0041] In this embodiment, as Figure 1 and Figure 3 As shown, the main trapezoidal external thread of the casing body 2 is a 1-inch NPT thread, and the technical parameters are as follows:

[0042] The total thread length L4 needs to be measured using a vernier caliper or a special plate gauge. The measurement range is from the pipe end to the point where the thread disappears, and the dimension is 25.01±2.21mm.

[0043] The complete thread length is also measured using a vernier caliper or a special plate gauge, either at the actual position or by observing the distance from the pipe end. The dimension is not less than 13.93 mm.

[0044] The effective thread length L2 is 17.34 mm.

[0045] The pitch is 11.5 threads / in. An API pitch gauge or a NPT calibration block is required for zeroing and measuring the deviation value.

[0046] This embodiment also includes a trapezoidal internal thread on the sleeve coupling 1 of 1inNPT, such as... Figure 1 and Figure 4 As shown, the technical parameter requirements are as follows:

[0047] The outer diameter W of sleeve coupling 1 needs to be measured using a vernier caliper. Measure once at each end of sleeve coupling 1, and the dimension is 40.03±1%.

[0048] The length NL of sleeve coupling 1 is also measured using vernier calipers, and the actual value is not less than 66.7mm.

[0049] The pitch is also 11.5 threads / in, and an API pitch gauge or NPT calibration block is required for zeroing and measuring the deviation value.

[0050] After processing, phosphating is required. After phosphating, the surface of the trapezoidal external thread needs to be coated with anti-rust oil to ensure that the product has good anti-rust performance during storage and transportation.

[0051] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A pipeline threaded connector and coupling, characterized in that, include: The sleeve coupling (1) has a reverse shoulder, a first transition surface (12) and an arc protrusion in the radial direction from the outside to the inside at its end; The sleeve body (2) has a reverse oblique contact surface, a first transition arc surface (22) and a circular arc groove in the radial direction from the outside to the inside at the position corresponding to the end of the sleeve coupling (1) at the threaded joint of the sleeve body (2). The outer wall of the sleeve body (2) is provided with a trapezoidal external thread, and the inner wall of the sleeve coupling (1) is provided with a trapezoidal internal thread that matches the trapezoidal external thread. When the trapezoidal internal thread of the sleeve coupling (1) is fully engaged with the trapezoidal external thread of the sleeve body (2), the reverse shoulder abuts against the reverse oblique contact surface to form a first sealing surface (31), the arc protrusion cooperates with the arc groove to form a second sealing arc surface (32), and a gap is formed between the first transition surface (12) of the sleeve coupling (1) and the first transition arc surface (22) of the sleeve body (2).

2. The pipeline threaded joint and coupling according to claim 1, characterized in that, The anti-shoulder includes a first outer plane disposed on the outer wall of the sleeve coupling (1) and a second plane connected to the first outer plane disposed on the end of the sleeve coupling (1), wherein: The first outer plane is parallel to the axial direction of the sleeve coupling (1); The angle between the second plane and the first outer plane is 60°-90°.

3. The pipeline threaded joint and coupling according to claim 1, characterized in that, The trapezoidal internal thread of the sleeve coupling (1) is an NPT thread with a thread density of 11.5TPI.

4. The pipeline threaded joint and coupling according to claim 1, characterized in that, The taper of the trapezoidal external thread of the sleeve body (2) and the trapezoidal internal thread of the sleeve coupling (1) are both 1:

16.

5. The pipeline threaded joint and coupling according to claim 1, characterized in that, The outer diameter of the sleeve body (2) is 33.4 mm.

6. The pipeline threaded joint and coupling according to claim 1, characterized in that, The outer diameter of the sleeve coupling (1) is 40 mm.

7. The pipeline threaded joint and coupling according to claim 1, characterized in that, The surface roughness of the trapezoidal external thread of the sleeve body (2) and the trapezoidal internal thread of the sleeve coupling (1) is no greater than Ra3.2 micrometers.

8. The pipeline threaded joint and coupling according to claim 1, characterized in that, The trapezoidal internal thread surface of the sleeve coupling (1) is provided with a rust-proof paint layer.

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