CN219974434U

CN219974434U - Special threaded joint

Info

Publication number: CN219974434U
Application number: CN202321286430.5U
Authority: CN
Inventors: 秦双双; 陈晨; 王领; 刘辉; 尤天龙; 马鹏越; 王永胜; 安中望; 佟明达
Original assignee: China National Offshore Oil Corp CNOOC; CNOOC Energy Development of Equipment and Technology Co Ltd; Processing and Manufacturing Branch of CNOOC Energy Development of Equipment and Technology Co Ltd
Current assignee: China National Offshore Oil Corp CNOOC; CNOOC Energy Development of Equipment and Technology Co Ltd; Processing and Manufacturing Branch of CNOOC Energy Development of Equipment and Technology Co Ltd
Priority date: 2023-05-25
Filing date: 2023-05-25
Publication date: 2023-11-07
Anticipated expiration: 2033-05-25

Abstract

The utility model provides a special threaded joint which comprises a pipe body, a clamp and a contact surface sealing ring, wherein a connecting end is arranged on the pipe body, a shoulder sealing structure is arranged on the connecting end, a sealing groove is arranged on the shoulder sealing structure, the contact surface sealing ring is arranged in the sealing groove, an external thread is arranged on the outer wall of the connecting end of the pipe body, the external thread is matched with an internal thread correspondingly arranged on the clamp, and a sealing convex structure is arranged on the inner wall of the clamp and matched with the shoulder sealing structure. The utility model has the advantages of simple and reliable structure, stable connection performance, excellent sealing performance and the like. The pipe has two metal-metal sealing structures, wherein the first metal-metal sealing structure is formed by arc-shaped bulges on the outer surface of the head of the pipe body and the inner surface of the head of the clamp, and is used as a fixed type seal. The second metal-metal sealing structure is formed by a metal sealing ring arranged at the connecting end of the pipe body and the inner surface of the head part of the clamp, and the contact stress of the sealing position can be regulated in three modes.

Description

Special threaded joint

Technical Field

The utility model relates to the field of threaded joints of oil well pipes, in particular to a special threaded joint.

Background

The oil pipe and the sleeve are the pipes with the largest consumption in the exploitation of oil and natural gas. The underground casing string is a unique and permanent passage for exploiting oil and gas resources, and is mainly used for sealing stratum, protecting well wall and sealing oil, gas and water layers of different pressure systems, thereby playing a vital role in the rational development of oil and gas reservoirs. In the oil and gas industry, the oil casings are used in very large quantities. The threaded part of the oil casing is the weakest and important link in the whole oil casing connection, and is the key part of the oil casing.

API circular thread and buttress thread oil sleeve joint are widely used in oil fields. Because of the defects of the API joint, in order to improve the joint strength and performance, casing manufacturers at home and abroad begin to develop non-API joints, and successfully develop special threaded joints suitable for complex well conditions. The research on special threaded joints mainly focuses 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 other loads.

Along with the increasing exploitation of deep wells, ultra-deep wells, high-pressure oil and gas wells and thermal recovery wells, the drilling requirements are continuously improved, the problems of stress and deformation of the threaded tooth surface of the oil casing become more complex, the problems of sliding thread leakage, breakage and the like caused by thread failure are also increasingly outstanding, and the oil and gas production under various working conditions is seriously influenced. In particular, oil casing joints with excellent sealing performance have been developed as a focus of attention, as the requirements for sealing performance in oil and gas production are becoming higher and higher.

Disclosure of Invention

The utility model overcomes the defects in the prior art and provides a special threaded joint.

The aim of the utility model is achieved by the following technical scheme.

The utility model provides a special screwed joint, includes body, clamp and contact surface sealing ring, is equipped with the link on the body, is equipped with circular bead seal structure on the link, is equipped with seal groove on the circular bead seal structure, is equipped with the contact surface sealing ring in the seal groove, is equipped with the external screw thread on the link outer wall of body, and the external screw thread corresponds the internal screw thread assorted that sets up on clamp, is equipped with sealed protruding structure and circular bead seal structure assorted on the clamp inner wall.

The sealing bulge structure is an arc bulge structure.

The outer wall of the connecting end of the pipe body is a cylindrical surface or a conical surface.

The external thread and the internal thread are buttress threads.

The contact surface sealing ring is a metal sealing ring.

The cross section of the contact surface sealing ring is of a C-shaped structure, and the C-shaped arc surface of the contact surface sealing ring faces the inner wall of the clamp.

The beneficial effects of the utility model are as follows: the special threaded joint for the oil casing has the characteristics of simple and reliable structure, stable connection performance, excellent sealing performance and the like. The pipe has two metal-metal sealing structures, wherein the first metal-metal sealing structure is formed by arc-shaped bulges on the outer surface of the head of the pipe body and the inner surface of the head of the clamp, and is used as a fixed type seal. The second metal-metal sealing structure is formed by a metal sealing ring arranged at the connecting end of the pipe body and the inner surface of the head part of the clamp, and the sealing structure is used as an adjustable seal, and can adjust the contact stress of the sealing position by changing the pretightening force, the sealing ring material and the shape of the sealing ring. In summary, the special threaded joint has good multi-working condition adaptability, and can be adjusted according to the required sealing pressure on the basis of not changing the main body structure.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is an enlarged partial view of portion A of FIG. 1;

FIG. 3 is an enlarged partial view of portion B of FIG. 1;

in the figure: 100. a tube body; 110. a shoulder seal arrangement; 120. sealing the groove; 130. an external thread; 200. a clamp; 210. an internal thread; 220. a sealing protrusion structure; 300. contact surface sealing ring.

Detailed Description

The technical scheme of the utility model is further described by specific examples.

Examples

The utility model provides a special screwed joint, includes body 100, clamp 200 and contact surface sealing ring 300, is equipped with the link on the body 100, is equipped with shoulder seal structure 110 on the link, is equipped with seal groove 120 on the shoulder seal structure 110, is equipped with contact surface sealing ring 300 in the seal groove 120, is equipped with external screw thread 130 on the link outer wall of body 100, and external screw thread 130 matches with the internal screw thread 210 phase-match that corresponds the setting on the clamp 200, is equipped with sealed protruding structure 220 and shoulder seal structure 110 phase-match on the clamp 200 inner wall.

The sealing protrusion structure 220 is an arc-shaped protrusion structure.

The outer wall of the connecting end of the pipe body 100 is a cylindrical surface or a conical surface.

The external threads 130 and the internal threads 210 are buttress threads.

The contact surface seal ring 300 is a metal seal ring.

The cross section of the contact surface sealing ring 300 is of a C-shaped structure, and the C-shaped arc surface of the contact surface sealing ring 300 faces the inner wall of the clamp 200.

The working principle of the present utility model is as follows, as shown in fig. 1 to 3, the pipe body 100 and the yoke 200 are coupled together by the external thread 130 and the internal thread 210, and the shoulder seal structure 110 and the seal protrusion structure 220 are contacted to form a metal-metal contact as a first seal structure of the stationary seal. When the pipe body 100 and the yoke 200 are coupled together with a certain make-up torque, the inner surface of the yoke 200 presses the contact surface seal ring 300 to form contact as a second seal structure. The second sealing structure is an adjustable seal, and the contact stress of the sealing position can be adjusted by changing the pretightening force, changing the material of the contact surface sealing ring 300 and changing the shape of the contact surface sealing ring 300, so that the special threaded joint of the oil pipe sleeve has good multi-space condition adaptability, and the device can be adjusted according to the required sealing pressure on the basis of not changing the main structure.

Preferably, the contact surface sealing ring 300 is a metal sealing ring with a C-shaped cross section, and can form a metal-metal contact seal with the inner surface of the clip 200. The interface seal ring 300 may alternatively take the form of an O-ring or other shape.

The foregoing describes one embodiment of the present utility model in detail, but the description is only a preferred embodiment of the present utility model and should not be construed as limiting the scope of the utility model. All equivalent changes and modifications within the scope of the present utility model are intended to be covered by the present utility model.

Claims

1. A special threaded joint, characterized in that: including body, clamp and contact surface sealing ring, be equipped with the link on the body, be equipped with circular bead seal structure on the link, be equipped with seal groove on the circular bead seal structure, be equipped with the contact surface sealing ring in the seal groove, be equipped with the external screw thread on the link outer wall of body, the external screw thread corresponds the internal thread assorted that sets up on with the clamp, is equipped with sealed protruding structure and circular bead seal structure assorted on the clamp inner wall.

2. A special threaded joint according to claim 1, characterized in that: the sealing bulge structure is an arc bulge structure.

3. A special threaded joint according to claim 1, characterized in that: the outer wall of the connecting end of the pipe body is a cylindrical surface or a conical surface.

4. A special threaded joint according to claim 1, characterized in that: the external thread and the internal thread are buttress threads.

5. A special threaded joint according to claim 1, characterized in that: the cross section of the contact surface sealing ring is of a C-shaped structure, and the C-shaped arc surface of the contact surface sealing ring faces the inner wall of the clamp.

6. A special threaded joint according to any one of claims 1 to 5, characterized in that: the contact surface sealing ring is a metal sealing ring.