Anti-deformation high-sealing-performance threaded connection structure

Abstract

The utility model relates to the field of threaded connection structures, in particular to an anti-deformation threaded connection structure with high sealing performance. An anti-deformation high-sealing-performance threaded connection structure comprises a female buckle, the female buckle is of an internal thread structure arranged in the circumferential direction in the axial direction of the female buckle, and the internal thread structure is obliquely arranged from one end of the female buckle to the other end of the female buckle; the male buckle is of an external thread structure matched with the female buckle, the external thread structure is obliquely arranged from one end of the male buckle to the other end of the male buckle, the oblique arrangement angle of the female buckle and the oblique arrangement angle of the male buckle are the same, a metal sealing section is arranged at the top end of the male buckle, and the metal sealing section is formed into three arc sections which abut against one another. And the end part of the male buckle and the end part of the female buckle are sealed. The three arc sections which abut against one another serve as the top ends, stress concentration of the combination part of the male buckle and the female buckle is reduced, and the over-torque resistance and the fatigue resistance are improved.

Description

Technical Field

[0001] The utility model relates to the field of threaded connection structures, in particular to a deformation-resistant and highly sealing threaded connection structure. Background Art

[0002] Oil casing is a steel pipe used to support the wall of oil and gas wells to ensure the normal operation of the entire oil well during the drilling process and after completion. According to the use, casing can be divided into: guide tube, surface casing, technical casing and oil layer casing. Oil special pipe is mainly used for drilling oil and gas wells and transporting oil and gas. It includes oil drill pipe, oil casing and pumping pipe. Oil drill pipe is mainly used to connect drill collars and drill bits and transmit drilling power. Pumping pipe mainly transports oil and gas at the bottom of the oil well to the ground.

[0003] In the application process of existing oil pipes, production casings and intermediate casing strings, a relatively strict airtight sealing environment is required. At the same time, under the external air pressure, temperature and external force environment, the oil pipes are required to maintain good structural characteristics.

[0004] In view of the above-mentioned prior art, the inventors found that the existing oil pipe threaded connection structure has poor sealing performance due to the simple use of a threaded connection method. At the same time, it cannot provide a good anti-deformation effect under the action of external forces, resulting in weak overall sealing stability. Utility Model Content

[0005] In order to solve the above technical problems, the present application provides a deformation-resistant and highly sealing threaded connection structure.

[0006] The present application provides an anti-loosening vehicle fastener adopts the following technical solution:

[0007] A deformation-resistant and highly sealing threaded connection structure comprises:

[0008] A female buckle, wherein the female buckle is formed into an internal thread structure arranged circumferentially along its axial direction, and the internal thread structure is inclined from one end of the female buckle toward the other end;

[0009] A male buckle, wherein the male buckle is formed into an external thread structure matched with the female buckle, the external thread structure is inclined along one end of the male buckle toward the other end, the female buckle and the male buckle are inclined at the same angle, and a metal sealing section is provided at the top of the male buckle, and the metal sealing section is formed into three arc sections abutting against each other to seal the end of the male buckle with the end of the female buckle.

[0010] Through the above technical solution, the present application uses three arc segments that are arranged to abut against each other as the top end, which can effectively reduce the stress concentration at the joint between the male buckle and the female buckle, and improve the ability to resist over-torque and fatigue.

[0011] On this basis, the three arc segments that abut each other can be introduced more smoothly during the make-up process compared to the traditional double-taper design. The axial and radial pressures at the end of the male buckle can produce good sealing performance. The metal-to-metal seal at the end is optimized to improve the sealing performance while preventing any wear problems. Despite the use and deformation of the seal, as well as load cycles, the sealing integrity remains unchanged.

[0012] Preferably, the female buckle comprises:

[0013] A main thread segment, which is disposed at one end of the box buckle and has a plurality of main thread teeth disposed at equal intervals;

[0014] A secondary thread segment, the secondary thread segment is arranged at the other end of the box buckle and is provided with a plurality of secondary thread teeth arranged at equal intervals;

[0015] The spaced thread segment is abutted between the main thread segment and the secondary thread segment, and the spaced thread segment is provided with a plurality of spaced thread teeth at equal intervals.

[0016] Preferably, the pin includes a plurality of pin thread teeth arranged at equal intervals.

[0017] Preferably, the spacing between the male thread teeth is the same as the spacing between the spaced thread teeth.

[0018] Preferably, the spacing between the secondary thread segments is smaller than the spacing between the spaced thread teeth, and the spacing between the spaced thread teeth is smaller than the spacing between the primary thread teeth.

[0019] Through the above technical solution, the present application optimizes the structure of the male buckle and the female buckle, and adjusts the pitch of the female buckle to a three-stage structure. Compared with the traditional equally spaced pitch distributed structure, the pitch of the main thread segment is the largest, the pitch of the interval thread segment is moderate, and the pitch of the secondary thread segment is adjusted to be the smallest. This structural design can reduce the load on the main thread segment and the secondary thread segment due to the different bearing surface gaps when the connection structure is subjected to external force, and the interval thread segment is subjected to force first, thereby reducing the circumferential interference of the structure and reducing the risk of sticking.

[0020] Preferably, the main thread teeth, the secondary thread teeth and the spacer thread teeth are all provided with end faces abutting against the pin thread teeth, and the end faces are inclined at 3° with respect to the axial direction of the box thread teeth.

[0021] Through the above technical solution, the present application optimizes the contact between the end face and the axial direction of the box buckle, and adopts a smoother structural design. Compared with the traditional solution, this design can improve the tensile performance and has higher performance under external pressure, compression and bending. The optimized thread geometry can also reduce the risk of wear even if the thread lubricant is not applied properly.

[0022] Preferably, the central angles of the three mutually abutting arc segments in the metal sealing segment from bottom to top are 15°, 75° and 25° respectively.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. The present application uses three arc segments that are mutually abutted as the top, which can effectively lower and reduce the stress concentration at the joint between the male buckle and the female buckle, thereby improving the ability to resist over-torque and fatigue.

[0025] On this basis, the three arc segments that abut each other can be introduced more smoothly during the make-up process compared to the traditional double-taper design. The axial and radial pressures at the end of the male buckle can produce good sealing performance. The metal-to-metal seal at the end is optimized to improve the sealing performance while preventing any wear problems. Despite the use and deformation of the seal, as well as load cycles, the sealing integrity remains unchanged.

[0026] 2. This application optimizes the structure of the male buckle and the female buckle, and adjusts the pitch of the female buckle to a three-stage structure. Compared with the traditional equally spaced pitch distributed structure, the pitch of the main thread segment is the largest, the pitch of the interval thread segment is moderate, and the pitch of the secondary thread segment is adjusted to be the smallest. This structural design can reduce the load on the main thread segment and the secondary thread segment due to the different bearing surface gaps when the connection structure is subjected to external force, and the interval thread segment is subjected to force first, thereby reducing the circumferential interference of the structure and reducing the risk of sticking.

[0027] 3. This application optimizes the contact between the end face and the axial direction of the box buckle, and adopts a smoother structural design. Compared with the traditional solution, this design can improve the tensile performance and has higher performance under external pressure, compression and bending. The optimized thread geometry can also reduce the risk of wear even if the thread lubricant is not applied properly. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of a special threaded joint with high sealing performance in an embodiment of the present application, and the thread profile is not specifically shown.

[0029] Figure 2 It is an exploded schematic diagram of a deformation-resistant and highly sealing threaded connection structure in an embodiment of the present application.

[0030] Figure 3 It is a structural schematic diagram of the metal sealing end of the male thread in the deformation-resistant and highly sealing threaded connection structure in the embodiment of the present application, and the thread profile is not specifically shown.

[0031] Figure 4It is a partial schematic diagram of a deformation-resistant and highly sealing threaded connection structure in an embodiment of the present application.

[0032] Explanation of the reference numerals: 1. female thread; 11. main thread segment; 111. main thread teeth; 12. spacer thread segment; 121. spacer thread teeth; 13. secondary thread segment; 131. secondary thread teeth; 2. male thread; 21. male thread teeth; 22. metal sealing segment; 23. end face. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-4 This application is described in further detail.

[0034] The embodiment of the present application discloses a deformation-resistant and highly sealing threaded connection structure.

[0035] Reference Figure 1-4 A deformation-resistant and highly sealing threaded connection structure includes a pin 2 and a box 1. The box 1 is an internal thread structure circumferentially arranged along its axial direction, and is inclined from one end of the box 1 toward the other end. The pin 2 is an external thread structure matched with the box 1, and is inclined from one end of the pin 2 toward the other end. The angles of the inclination of the box 1 and the pin 2 are the same. A metal sealing section 22 is provided at the top of the pin 2. The metal sealing section 22 is formed into three circular arc sections that are arranged to abut against each other. The central angles of the three circular arc sections from bottom to top are 15°, 75° and 25° respectively. By optimizing the end structure of the three circular arc sections, the sealing performance is improved while preventing any wear problems. During the use and deformation of the seal, as well as load cycles, the sealing integrity remains unchanged.

[0036] like Figure 2 As shown, the box buckle 1 includes a main thread segment 11, a secondary thread segment 13 and a spacer thread segment 12. The main thread segment 11 is provided at one end of the box buckle 1 and is provided with a plurality of main thread teeth 111 arranged at equal intervals. The secondary thread segment 13 is provided at the other end of the box buckle 1 and is provided with a plurality of secondary thread teeth 131 arranged at equal intervals. The spacer thread segment 12 is abutted between the main thread segment 11 and the secondary thread segment 13 and is provided with a plurality of spacer thread teeth 121 arranged at equal intervals.

[0037] like Figure 4As shown, the male buckle 2 includes a plurality of male buckle threads 21 arranged at equal intervals. The spacing of the male buckle threads 21 is the same as the spacing between the spaced threads 121. The spacing of the secondary thread segments 13 is smaller than the spacing of the spaced threads 121, and the spacing of the spaced threads 121 is smaller than the spacing between the main thread segments 111. By adjusting the pitch of the female buckle 1 to a three-stage structure, compared with the traditional equally spaced pitch distributed structure, the pitch of the main thread segment 11 is the largest, the pitch of the spaced thread segment 12 is moderate, and the pitch of the secondary thread segment 13 is adjusted to be the smallest. This structural design can reduce the load on the main thread segment 11 and the secondary thread segment 13 when the connection structure is subjected to external force due to the different bearing surface gaps, and the spaced thread segment 12 is subjected to force first, thereby reducing the circumferential interference of the structure and reducing the risk of sticking.

[0038] The main thread 111 , the secondary thread 131 and the spacer thread 121 are all provided with an end face 23 which is arranged to abut against the pin thread 21 , and the end face 23 is arranged to be inclined at 3° with respect to the axial direction of the box 1 .

[0039] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A deformation-resistant and highly sealing threaded connection structure, characterized in that include: A female buckle (1), wherein the female buckle (1) is formed into an internal thread structure arranged circumferentially along its axial direction, and the internal thread structure is arranged obliquely from one end of the female buckle (1) toward the other end; A male buckle (2), wherein the male buckle (2) is formed into an external thread structure matched with the female buckle (1), the external thread structure is inclined along one end of the male buckle (2) toward the other end, the female buckle (1) and the male buckle (2) are inclined at the same angle, and a metal sealing section (22) is provided at the top end of the male buckle (2), and the metal sealing section (22) is formed into three circular arc sections abutting against each other, so that the end of the male buckle (2) is sealed with the end of the female buckle (1); The female buckle (1) comprises: A main thread section (11), the main thread section (11) being arranged at one end of the box buckle (1) and having a plurality of main thread teeth (111) arranged at equal intervals; A secondary thread segment (13), the secondary thread segment (13) being arranged at the other end of the box buckle (1) and having a plurality of secondary thread teeth (131) arranged at equal intervals; An interval thread segment (12), the interval thread segment (12) being disposed in contact between the primary thread segment (11) and the secondary thread segment (13), the interval thread segment (12) being provided with a plurality of equally spaced interval thread teeth (121); The spacing of the secondary thread segments (13) is smaller than the spacing of the spaced thread teeth (121), and the spacing of the spaced thread teeth (121) is smaller than the spacing between the primary thread teeth (111).

2. The anti-deformation high-sealing threaded connection structure according to claim 1, characterized in that: The male buckle (2) comprises a plurality of male buckle thread teeth (21) arranged at equal intervals.

3. The anti-deformation high-sealing threaded connection structure according to claim 2, characterized in that: The spacing between the male thread teeth (21) is the same as the spacing between the spaced thread teeth (121).

4. The anti-deformation high-sealing threaded connection structure according to claim 3, characterized in that: The main thread teeth (111), the secondary thread teeth (131) and the spacer thread teeth (121) are all provided with end faces (23) arranged to abut against the male thread teeth (21), and the end faces (23) are arranged to be inclined at 3° with respect to the axial direction of the female buckle (1).

5. The anti-deformation high-sealing threaded connection structure according to claim 1, characterized in that: The three circular arc segments in the metal sealing segment (22) that are arranged to abut against each other have central angles of 15°, 75° and 25° from bottom to top respectively.

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