CN219012520U - High-strength internal-leveling reinforced sealing oil pipe threaded joint - Google Patents
High-strength internal-leveling reinforced sealing oil pipe threaded joint Download PDFInfo
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- CN219012520U CN219012520U CN202222731303.3U CN202222731303U CN219012520U CN 219012520 U CN219012520 U CN 219012520U CN 202222731303 U CN202222731303 U CN 202222731303U CN 219012520 U CN219012520 U CN 219012520U
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- oil pipe
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Abstract
The utility model discloses a high-strength internal flat reinforced sealing oil pipe threaded joint, which comprises a coupling and an oil pipe of the threaded joint, wherein the coupling is connected with the oil pipe through buttress thread teeth, the top of the coupling is provided with an internal flat structure, an external thread is arranged on the oil pipe, an internal thread is arranged on the coupling, the tail part of the internal thread of the coupling is provided with a torque shoulder inclined towards the oil pipe by 20 degrees, the torque shoulder and the end part of the oil pipe are matched and provided with conical sealing surfaces inclined inwards by 30 degrees towards the axis of the oil pipe, and an excessive chamfer is arranged between the tail part of the internal thread of the coupling and the conical sealing surfaces; the inclination angle of the guide surface of the thread tooth is 20 degrees, the inclination angle of the thread bearing surface of the thread tooth is 1 degree, and the inclination direction of the thread bearing surface is opposite to the screwing direction of the oil pipe. The utility model aims to provide the oil pipe threaded joint which can reduce gaps among thread teeth, improve axial tensile strength, ensure reliability of nose metal seal, is not easy to produce erosion dirt and enhance sealing performance.
Description
Technical Field
The utility model relates to the technical field of drilling quick connectors, in particular to a high-strength internal flat reinforced sealing oil pipe threaded connector.
Background
The AP worker thread oil pipe use amount is huge in the offshore oil gas field exploitation, API thread oil pipe generally adopts the round thread type, round thread easily takes place the slippage, joint strength is poor, when API thread oil pipe is applied to ultra deep well, because tubular column length increases the tensile strength that leads to the screw thread to bear increases, thereby fracture or the phenomenon of slippage, simultaneously, when API thread oil pipe is applied to the water injection well, because API thread oil pipe connects and adopts the coupling to connect, the structural style of oil pipe coupling leads to there is certain gap in the middle of two male threads, easily produce erosion dirt, influence oil pipe passing rate, lead to oil pipe change frequently, the leakproofness of API thread is only realized sealedly through screw thread and screw thread fat filling, sealing performance is along with life cycle and service environment variation, very easily take place to leak, cause the sleeve pressure phenomenon between sleeve pipe and the oil pipe, thereby influence production. Therefore, there is a need for an oil pipe threaded joint that reduces the gap between the thread teeth, is less prone to erosion and fouling, and enhances the sealing performance.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art, and aims to provide the oil pipe threaded joint which can reduce gaps among thread teeth, improve the axial tensile strength, ensure the reliability of nose metal sealing, is not easy to produce erosion dirt and enhance the sealing performance.
In order to achieve the above purpose, the utility model is realized by the following technical scheme:
the utility model provides a high strength internal flat reinforcing seals oil pipe screwed joint, includes screwed joint's coupling and oil pipe, its characterized in that: the coupling is connected with the oil pipe through buttress thread teeth, the top of the coupling is provided with an inner flat structure, the oil pipe is provided with external threads, the coupling is provided with internal threads, the tail part of the internal threads of the coupling is provided with a torque shoulder inclined towards the oil pipe by 15-20 degrees, the torque shoulder is matched with the end part of the oil pipe and is provided with a conical sealing surface inclined inwards towards the axis of the oil pipe by 30 degrees, and an excessive chamfer is arranged between the tail part of the internal threads of the coupling and the conical sealing surface; the inclination angle of the guide surface of the thread tooth is 20 degrees, the inclination angle of the thread bearing surface of the thread tooth is 1 degree, and the inclination direction of the thread bearing surface is opposite to the screwing direction of the oil pipe.
Further, the axial length of the seal interference area of the conical sealing surface is 1.42mm.
Further, the inclination angle of the excessive chamfer is 5 degrees.
Further, the thread tooth height of the external thread is 1.27mm, and the thread tooth height of the internal thread is 1.32mm.
Compared with the prior art, the utility model has the following beneficial effects:
the thread teeth adopt buttress threads, so that the axial tensile strength is improved, the reliability of nose metal sealing is ensured, and the anti-slip performance is enhanced. The coupling adopts a torque shoulder with an inclination angle of 20 degrees and an internal flat structural form, compared with the connection of an API oil pipe coupling, the eddy current phenomenon can be reduced, and the problem that erosion dirt is easy to occur is solved. The torque shoulder is provided with the conical sealing surface with the end part of the oil pipe in a matched manner, so that the sealing performance of the threads of the oil pipe is enhanced relative to the planar sealing surface, the axial tensile strength is improved, the reliability of the metal seal of the nose is ensured, and the problem of casing pressure caused by oil pipe leakage is solved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a schematic diagram of a split structure of the present utility model;
fig. 3 is an enlarged view of a portion a in fig. 2;
fig. 4 is a schematic view of the structure of the thread tooth in the present utility model.
Reference numerals:
1-oil pipe, 2-external thread, 3-coupling, 4-internal thread, 5-internal flat structure, 6-torque shoulder, 7-conical sealing surface, 8-excessive chamfer, 9-guide surface and 10-thread bearing surface.
Detailed Description
The utility model will be described in detail below with reference to the drawings in connection with embodiments.
As shown in fig. 1 to 4, a high-strength internal flat reinforced seal oil pipe threaded joint comprises a coupling 3 and an oil pipe 1 of the threaded joint, wherein the coupling 3 is connected with the oil pipe 1 through buttress thread teeth, the top of the coupling 3 is provided with an internal flat structure 5, an external thread 2 is arranged on the oil pipe 1, an internal thread 4 is arranged on the coupling 3, the tail part of the internal thread 4 of the coupling 3 is provided with a torque shoulder 6 inclined towards the oil pipe by 15 degrees to 20 degrees, the torque shoulder 6 and the end part of the oil pipe 1 are matched with each other and provided with a conical sealing surface 7 inclined inwards by 30 degrees towards the axis of the oil pipe 1, and an excessive chamfer 8 is arranged between the tail part of the internal thread 4 of the coupling 3 and the conical sealing surface 7; the inclination angle of the guide surface 9 of the thread tooth is 20 degrees, the inclination angle of the thread bearing surface 10 of the thread tooth is 1 degree, and the inclination direction of the thread bearing surface 10 is opposite to the screwing direction of the oil pipe 1.
The axial length of the sealing interference area of the conical sealing surface 7 is 1.42mm, conical surface sealing is added relative to the API oil pipe thread, and sealing performance is enhanced.
Wherein the inclination angle of the excessive chamfer 8 is 5 degrees. The starting point of the conical sealing surface 7 is very important for the quality of the machining of the sealing surface and the control of the machining dimension, and the chamfer transition can facilitate the control of the quality of the machining dimension.
As shown in FIG. 4, the buttress thread is adopted as the thread teeth in the utility model, so that the connection strength of the thread can be improved, and the anti-slip performance can be enhanced. The buttress thread tooth angle is buttress for API, and guide surface 9 increases to 20, and the screw thread bearing surface 10 becomes 1, can be convenient for go into the knot, and the maximum clearance of machine tight state guide surface 9 is 0.05, for the maximum clearance of API screw thread 0.16, is favorable to keeping the metal seal variation little under tensile state. Wherein, the thread tooth height of the external thread 2 is 1.27mm, and the thread tooth height of the internal thread 4 is 1.32 epistaxis. Compared with the common thread tooth height of 1mm, the bearing area of the internal and external thread is increased, and the anti-galling performance is improved. Meanwhile, the given fit tolerance of the transition fillets of the thread profiles ensures that the internal threads and the external threads of the thread profiles are not interfered when being matched, and the anti-galling performance is improved.
The coupling 3 adopts the form of a torque shoulder 6 with an inclination angle of 15-20 degrees and an inner flat structure 5, and compared with the connection of an API oil pipe coupling, the inner flat structure 5 protruding inwards can reduce the vortex phenomenon and solve the problem of easy erosion and dirt generation. The torque shoulder 6 is matched with the end part of the oil pipe 1 and is provided with a conical sealing surface 7, so that the sealing performance of the threads of the oil pipe 1 is enhanced relative to the planar sealing surface, and the problem of casing pressure generated by leakage of the oil pipe 1 is solved.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (4)
1. The utility model provides a high strength internal flat reinforcing seals oil pipe screwed joint, includes screwed joint's coupling (3) and oil pipe (1), its characterized in that: the coupling (3) is connected with the oil pipe (1) through buttress thread teeth, an inner flat structure (5) is arranged at the top of the coupling (3), an external thread (2) is arranged on the oil pipe (1), an internal thread (4) is arranged on the coupling (3), a torque shoulder (6) inclined by 15 degrees and 20 degrees towards the oil pipe (1) is arranged at the tail part of the internal thread (4) of the coupling (3), a conical sealing surface (7) inclined by 30 degrees towards the axis of the oil pipe (1) is arranged at the end part of the torque shoulder (6) in a matched manner, and an excessive chamfer (8) is arranged between the tail part of the internal thread (4) of the coupling (3) and the conical sealing surface (7); the inclination angle of the guide surface (9) of the thread tooth is 20 degrees, the inclination angle of the thread bearing surface (10) of the thread tooth is 1 degree, and the inclination direction of the thread bearing surface (10) is opposite to the screwing direction of the oil pipe (1).
2. The high strength, internal flat reinforced seal tubing nipple of claim 1, wherein: the axial length of the sealing interference area of the conical sealing surface (7) is 1.42mm.
3. The high strength, internal flat reinforced seal tubing nipple of claim 1, wherein: the inclination angle of the excessive chamfer (8) is 5 degrees.
4. The high strength, internal flat reinforced seal tubing nipple of claim 1, wherein: the thread tooth height of the external thread (2) is 1.27mm, and the thread tooth height of the internal thread (4) is 1.32mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222731303.3U CN219012520U (en) | 2022-10-17 | 2022-10-17 | High-strength internal-leveling reinforced sealing oil pipe threaded joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222731303.3U CN219012520U (en) | 2022-10-17 | 2022-10-17 | High-strength internal-leveling reinforced sealing oil pipe threaded joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219012520U true CN219012520U (en) | 2023-05-12 |
Family
ID=86235002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222731303.3U Active CN219012520U (en) | 2022-10-17 | 2022-10-17 | High-strength internal-leveling reinforced sealing oil pipe threaded joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219012520U (en) |
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2022
- 2022-10-17 CN CN202222731303.3U patent/CN219012520U/en active Active
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