CN221169467U

CN221169467U - Threaded joint with high sealing performance

Info

Publication number: CN221169467U
Application number: CN202323078427.7U
Authority: CN
Inventors: 张英歌; 张雷; 石建云
Original assignee: Jiangsu Saiwei Petroleum Technology Co ltd
Current assignee: Jiangsu Saiwei Petroleum Technology Co ltd
Priority date: 2023-11-14
Filing date: 2023-11-14
Publication date: 2024-06-18
Anticipated expiration: 2033-11-14

Abstract

The utility model relates to a threaded joint with high sealing performance, which comprises a female buckle and a male buckle which are matched with each other, wherein the root of a thread of the female buckle is provided with a first sealing surface and a first limiting surface which are intersected with each other, the first sealing surface and the first limiting surface form a dihedral torque shoulder, one end of the first sealing surface, which is far away from the first limiting surface, is inclined towards the direction away from the male buckle, one end of the first limiting surface, which is far away from the first sealing surface, is inclined towards the direction close to the end part of the thread of the female buckle, and the top of the male buckle is provided with a second sealing surface matched with the first sealing surface and a second limiting surface matched with the first limiting surface. The utility model has the effect of improving the connection tightness and the connection strength of the threaded joint.

Description

Threaded joint with high sealing performance

Technical Field

The utility model relates to the field of special threads, in particular to a threaded joint with high sealing performance.

Background

The oil pipe is the pipe with the largest dosage in the exploitation of petroleum and natural gas, and two adjacent oil pipes are connected in a threaded connection mode. Common thread types mainly comprise standard thread types such as triangular threads, round threads, buttress threads, rectangular threads and the like, and the round threads and buttress threads are widely applied to oil well exploitation.

With the continuous progress of drilling and production process technology, under the problems of increased well depth, corrosion deterioration, high pressure, excessive temperature and the like, the requirements on the connection strength and the tightness between oil pipes are also continuously improved, and under the special well conditions such as deep wells, ultra-deep wells, horizontal wells, high-pressure wells, heavy corrosion wells, thickened oil thermal recovery wells and the like, the connection strength and the sealing performance of standard threads between the oil pipes are required to be improved.

Because the sealing performance and the connection strength of the round threaded joint and the buttress threaded joint are insufficient, oil pipe manufacturers at home and abroad develop special threaded joints suitable for complex well conditions. The research of oil pipe manufacturers at home and abroad on special threaded joints is mainly focused on analyzing the sealing performance, the connection strength, the mechanical behavior, the deformation failure condition and the like of a threaded section, a sealing surface and a shoulder under the loading and unloading of threads, axial load, internal and external pressure, bending moment, temperature and the like.

In oil well drilling and production, the sealing performance between oil pipes is a key factor affecting the drilling and production process technology, so that an oil pipe threaded joint with excellent sealing performance is needed.

Disclosure of utility model

In order to improve the sealing performance of a threaded joint, the application provides a threaded joint with high sealing performance.

The threaded joint with high sealing performance provided by the application adopts the following technical scheme:

The utility model provides a screwed joint of high leakproofness ability, includes box and pin thread that the cooperation was used, the screw thread root of box is provided with crossing first sealed face and first spacing face, first sealed face and first spacing face form dihedral moment of torsion shoulder, the one end that first sealed face was kept away from is kept away from to first spacing face is inclined towards the direction of keeping away from the pin thread, the one end that first sealed face was kept away from to first spacing face is inclined towards the direction that is close to box screw thread tip, the top of pin thread be provided with first sealed face complex second sealed face, with first spacing face complex second spacing face.

Preferably, the first sealing surface is inclined at an angle of 20 °.

Preferably, the inclination angle of the first limiting surface is 15 °.

Preferably, the bottom surface of the female thread tooth is a first bearing surface, one end of the first bearing surface away from the female thread groove is inclined towards the direction away from the first guide surface, the top surface of the male thread tooth is a second bearing surface, and the second bearing surface is matched with the first bearing surface.

Preferably, the inclination angle of the first bearing surface is 3 °.

Preferably, the top surface of the female thread tooth is a first guiding surface, one end of the first guiding surface far away from the female thread groove is inclined towards the direction close to the first bearing surface, the bottom surface of the male thread tooth is a second guiding surface, and the second guiding surface is matched with the first guiding surface.

Preferably, the first guide surface has an inclination angle of 10 °.

Preferably, the outer side edge of the top of the female thread is provided with a first arc surface, the outer side edge of the bottom of the female thread is provided with a second arc surface, the outer side edge of the top of the male thread is provided with a third arc surface, and the outer side edge of the bottom of the male thread is provided with a fourth arc surface.

Preferably, the threads of the box and the pin both have a taper and the taper is 6.25%.

In summary, the present application includes at least one of the following beneficial technical effects:

1. The wedge effect of the dihedral torque shoulder caused by the reverse angle of the first sealing surface and the matched second sealing surface gives the threaded joint superior sealing performance and connection strength, and the first limiting surface and the matched second limiting surface provide a resistance torque stop, so that accurate power tightness performance is allowed, the threaded connection is kept more stable at a limited distance, the ring stress in the connection is reduced, and the service life of the threaded joint is prolonged;

2. The first bearing surface and the second bearing surface which are matched for use not only improve the tensile property of the threaded joint, but also have higher properties under external pressure, compression and bending;

3. The first guide surface and the second guide surface which are matched for use, and the first arc surface and the second arc surface on the female thread tooth, and the third arc surface and the fourth arc surface on the male thread tooth reduce the abrasion risk caused by improper application of the thread lubricant.

Drawings

Fig. 1 is a schematic view of the overall structure of a high-sealing-performance threaded joint according to an embodiment of the present application, and the thread form is not specifically shown.

Fig. 2 is a schematic diagram of an exploded structure for showing the first sealing surface and the second sealing surface in the embodiment of the present application.

Fig. 3 is a schematic view showing a partial structure of a specific thread form in an embodiment of the present application.

Fig. 4 is a schematic view of an exploded structure for showing a first bearing surface and a second bearing surface in an embodiment of the present application.

Reference numerals illustrate: 1. a female buckle; 11. a first sealing surface; 12. a first limiting surface; 2. a male buckle; 21. a second sealing surface; 22. the second limiting surface; 3. a dihedral torque shoulder; 4. female thread teeth; 41. a first bearing surface; 42. a first guide surface; 43. a first arc surface; 44. a second arc surface; 5. a male thread tooth; 51. a second bearing surface; 52. a second guide surface; 53. a third arc surface; 54. and a fourth arc surface.

Detailed Description

The application is described in further detail below with reference to fig. 1-4.

The embodiment of the application discloses a threaded joint with high sealing performance.

Referring to fig. 1-2, a high-sealability threaded joint comprises a box 1 and a pin 2 which are matched for use, wherein the threads of the box 1 and the pin 2 are tapered and the taper is 6.25%. The thread root of the box 1 is provided with a first sealing surface 11 and a first limiting surface 12 which are intersected, the first sealing surface 11 and the first limiting surface 12 form a dihedral torque shoulder 3, one end of the first sealing surface 11 away from the first limiting surface 12 is inclined towards a direction away from the pin 2, the inclination angle of the first sealing surface 11 is 20 degrees, one end of the first limiting surface 12 away from the first sealing surface 11 is inclined towards a direction close to the thread end of the box 1, and the inclination angle of the first limiting surface 12 is 15 degrees. The top of the pin 2 is provided with a second sealing surface 21 matched with the first sealing surface 11 and a second limiting surface 22 matched with the first limiting surface 12, and the second sealing surface 21 and the second limiting surface 22 are also intersected.

The wedge effect of the dihedral torque shoulder 3 caused by the reverse angle of the first sealing surface 11 and the mating second sealing surface 21 gives the threaded joint superior sealing properties and connection strength, and the first stop surface 12 and the mating second stop surface 22 provide a resistive torque stop, allowing accurate dynamic tightening properties, keeping the threaded connection more stable at limited distances, reducing ring stresses in the connection, and improving the service life of the threaded joint.

Referring to fig. 3 to 4, the bottom surface of the box thread 4 is a first bearing surface 41, one end of the first bearing surface 41 away from the box thread groove is inclined towards a direction away from the first guiding surface 42, the inclination angle of the first bearing surface 41 is 3 °, the top surface of the pin thread 5 is a second bearing surface 51, and the second bearing surface 51 is matched with the first bearing surface 41.

The first bearing surface 41 and the second bearing surface 51 used in combination not only improve the tensile properties of the threaded joint, but also have higher properties under external pressure, compression and bending.

The top surface of the box thread tooth 4 is a first guiding surface 42, one end of the first guiding surface 42 away from the box thread groove is inclined towards a direction approaching to the first bearing surface 41, the inclination angle of the first guiding surface 42 is 10 degrees, the bottom surface of the pin thread tooth 5 is a second guiding surface 52, and the second guiding surface 52 is matched with the first guiding surface 42.

The outer side of the top of the female thread 4 is provided with a first arc surface 43, the outer side of the bottom of the female thread 4 is provided with a second arc surface 44, the outer side of the top of the male thread 5 is provided with a third arc surface 53, and the outer side of the bottom of the male thread 5 is provided with a fourth arc surface 54.

The first guide surface 42 and the second guide surface 52 which are matched for use, and the first arc surface 43 and the second arc surface 44 on the box thread 4, and the third arc surface 53 and the fourth arc surface 54 on the pin thread 5 reduce the abrasion risk caused by improper application of the thread lubricant.

The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.

Claims

1. A screwed joint with high sealing performance is characterized in that: including box (1) and pin thread (2) that the cooperation was used, the screw thread root of box (1) is provided with crossing first sealed face (11) and first spacing face (12), first sealed face (11) and first spacing face (12) form dihedral torque shoulder (3), the one end that first spacing face (12) was kept away from to first sealed face (11) is towards the direction slope of keeping away from pin thread (2), the one end that first sealed face (11) was kept away from to first spacing face (12) is towards the direction slope that is close to box (1) screw thread tip, the top of pin thread (2) is provided with first sealed face (11) complex second sealed face (21), with first spacing face (12) complex second spacing face (22).

2. A high-tightness threaded joint according to claim 1, characterized in that: the first sealing surface (11) is inclined at an angle of 20 degrees.

3. A high-tightness threaded joint according to claim 1, characterized in that: the inclination angle of the first limiting surface (12) is 15 degrees.

4. A high-tightness threaded joint according to claim 1, characterized in that: the bottom surface of box screw thread tooth (4) is first loading surface (41), the one end that box thread groove was kept away from to first loading surface (41) is inclined towards the direction of keeping away from first guide surface (42), and the top surface of pin thread tooth (5) is second loading surface (51), second loading surface (51) and first loading surface (41) cooperation.

5. The high-tightness threaded joint as claimed in claim 4, wherein: the first bearing surface (41) has an inclination angle of 3 degrees.

6. A high-tightness threaded joint according to claim 1, characterized in that: the top surface of box screw thread tooth (4) is first guide surface (42), the one end that box thread groove was kept away from to first guide surface (42) is towards being close to the direction slope of first loading surface (41), and the bottom surface of pin thread tooth (5) is second guide surface (52), second guide surface (52) and first guide surface (42) cooperation.

7. The high-tightness threaded joint according to claim 6, characterized in that: the first guide surface (42) is inclined at an angle of 10 °.

8. The high-tightness threaded joint as claimed in claim 4, wherein: the novel male thread comprises a female thread tooth (4), wherein a first arc surface (43) is arranged on the outer side edge of the top of the female thread tooth (4), a second arc surface (44) is arranged on the outer side edge of the bottom of the female thread tooth (4), a third arc surface (53) is arranged on the outer side edge of the top of a male thread tooth (5), and a fourth arc surface (54) is arranged on the outer side edge of the bottom of the male thread tooth (5).

9. A high-tightness threaded joint according to claim 1, characterized in that: the threads of the female buckle (1) and the male buckle (2) are tapered and the taper is 6.25%.