A multi-seal, no collar threaded connection

Abstract

The utility model discloses a kind of multi-sealing no coupling thread connection structure, including first connecting end and second connecting end, the first connecting end is thread-connected between second connecting end, the tooth shape of thread connection adopts API bias spiral, pitch all adopts 5 teeth design structure, the first connecting end is provided with lengthened sealing surface A, lengthened sealing surface A and the lengthened sealing surface B of second connecting end and be provided form main sealing surface, the second connecting end is contacted with the first connecting end position and forms V type sealing anti-torsion shoulder, the length of lengthened sealing surface A is 8-10mm, shoulder end surface contact surface angle is at 0-5 degrees, 45 degrees chamfer is set, this connection structure, in sealing, anti-torque, compression resistance capability all have improved.

Description

Technical Field

[0001] This utility model belongs to the field of petroleum extraction technology, specifically relating to a multi-seal, coupling-free threaded connection structure. Background Technology

[0002] As oil well conditions become increasingly complex, and to reduce costs, smaller wells and old well repairs are becoming more common, leading to the widespread application of coupling-less threaded connections in oil tubing. The API standard specifies coupling-less direct-connection oil casing sizes ranging from 5 to 10 3 / 4 inches, with thick-walled tubing. Sizes from 5 to 7 5 / 8 inches have a thread pitch of 6 threads per inch, while sizes from 8 5 / 8 to 10 3 / 4 inches have a thread pitch of 5 threads per inch. This patent, however, uses a 5-thread design for all sizes from 5 to 10 3 / 4 inches, unlike the API design, thus improving downhole speed. The API direct-connection design lacks an external sealing surface, only having an internal sealing surface with a 45° retraction angle and no torsional shoulder, resulting in weak sealing and torsional resistance.

[0003] In view of the above factors, this utility model provides a multi-seal couplingless threaded connection structure, which improves sealing performance, torque resistance, and compression resistance. Utility Model Content

[0004] The purpose of this utility model is to provide a multi-seal, coupling-free threaded connection structure to solve the problems mentioned in the background art.

[0005] The purpose of this utility model is achieved through the following technical solution: a multi-seal coupling-free threaded connection structure, including a first connection end and a second connection end, the first connection end and the second connection end are threadedly connected, the tooth profile of the threaded connection adopts API trapezoidal tooth profile, and the pitch adopts a 5-tooth design structure.

[0006] An extended sealing surface A is provided on the first connecting end, and the extended sealing surface A and the extended sealing surface B provided on the second connecting end form a main sealing surface;

[0007] A V-shaped sealing anti-torsion shoulder is formed at the contact position between the second connecting end and the first connecting end.

[0008] Furthermore, the length of the extended sealing surface A is 8-10mm, and the shoulder end face contact surface is chamfered at 45 degrees.

[0009] Furthermore, the cone angle of the V-shaped sealing anti-torsion shoulder is 150 degrees, the angle between the two sealing surfaces and the axis is 15°, and the height of the sealing surfaces on both sides of the V-shaped sealing anti-torsion shoulder is higher than that of the extended sealing surface B to form a circumferential anti-torsion shoulder.

[0010] Furthermore, the contact position between the shoulder of the second connecting end and the first connecting end transitions from an arc surface to a conical surface.

[0011] Furthermore, both the first connecting end and the second connecting end are provided with a sealing surface A and a sealing surface B at their mating contact positions.

[0012] Furthermore, the sealing surface A end of the first connecting end forms a conical angle surface that mates with the V-shaped sealing anti-torsion shoulder formed on the second connecting end. The conical angle surface is 150 degrees, and the angle between the two sealing surfaces of the conical angle surface and the axis is 15°.

[0013] Furthermore, two shoulders are formed on the first and second connecting ends. The two shoulders include a main shoulder and an auxiliary shoulder. The main shoulder is close to the trapezoidal side of the API, and the auxiliary shoulder is the contact end of the first and second connecting ends.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This invention features multiple sealing surfaces for enhanced sealing performance, and employs a double-shoulder design to reduce the torque on the threads and improve torsional resistance.

[0016] The connection structure of this utility model has improved in terms of sealing performance, torque resistance, and compression resistance. Attached Figure Description

[0017] Figure 1 This is a schematic cross-sectional view of the overall connection of this utility model;

[0018] Figure 2 This is a schematic diagram of the first connecting end of this utility model;

[0019] Figure 3 This is a schematic diagram of the second connecting end of this utility model;

[0020] Figure 4 This is a utility model Figure 1 A magnified view of a portion of the image;

[0021] Figure 5 This is a utility model Figure 2 A magnified view of a portion of the image. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] like Figure 1-5 As shown, a multi-seal couplingless threaded connection structure includes a first connecting end 1 and a second connecting end 2. The first connecting end 1 and the second connecting end 2 are threaded together. The tooth profile of the threaded connection adopts the API trapezoidal tooth profile, and the pitch adopts a 5-tooth design structure.

[0026] The first connecting end 1 is provided with an extended sealing surface A3, and the extended sealing surface A3 and the extended sealing surface B4 provided on the second connecting end 2 form a main sealing surface;

[0027] A V-shaped sealing anti-torsion shoulder 5 is formed at the contact position between the second connecting end 2 and the first connecting end 1.

[0028] The length of the extended sealing surface A3 is 8-10mm, and the shoulder end face contact surface is chamfered at 45 degrees.

[0029] To improve sealing performance during use, the V-shaped anti-torsion shoulder 5 has a cone angle of 150 degrees, and the angle between the two sealing surfaces and the axis is 15°. Furthermore, the height of the sealing surfaces on both sides of the V-shaped anti-torsion shoulder 5 is higher than that of the extended sealing surface B4 to form a circumferential anti-torsion shoulder.

[0030] The contact position between the second connecting end 2 and the shoulder of the first connecting end 1 transitions from an arc surface to a conical surface.

[0031] Both the first connecting end 1 and the second connecting end 2 are provided with a sealing surface A6 and a sealing surface B7 at the mating contact position.

[0032] The sealing surface A6 end of the first connecting end 1 forms a conical angle surface 8 that mates with the V-shaped sealing anti-torsion shoulder formed on the second connecting end 2. The conical angle surface 8 is 150 degrees, and the angle between the two sealing surfaces of the conical angle surface 8 and the axis is 15°.

[0033] To reduce the torque on the threads and improve torsional resistance during use, two shoulders are formed on the first connecting end 1 and the second connecting end 2. The two shoulders include a main shoulder 9 and an auxiliary shoulder 10. The main shoulder 9 is close to the API trapezoidal tooth side, and the auxiliary shoulder 10 is the contact end of the first connecting end 1 and the second connecting end 2.

[0034] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0035] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-seal, coupling-free threaded connection structure, characterized in that: It includes a first connecting end (1) and a second connecting end (2), and the first connecting end (1) and the second connecting end (2) are threaded together. The threaded connection adopts the API trapezoidal tooth profile, and the pitch adopts a 5-tooth design structure. An extended sealing surface A (3) is provided on the first connecting end (1), and the extended sealing surface A (3) and the extended sealing surface B (4) provided on the second connecting end (2) form the main sealing surface; A V-shaped sealing anti-torsion shoulder (5) is formed at the contact position between the second connecting end (2) and the first connecting end (1).

2. The multi-seal couplingless threaded connection structure according to claim 1, characterized in that: The length of the extended sealing surface A(3) is 8-10mm, and the shoulder end face contact surface is chamfered at 45 degrees.

3. The multi-seal couplingless threaded connection structure according to claim 2, characterized in that: The cone angle of the V-shaped sealing anti-torsion shoulder (5) is 150 degrees, the angle between the two sealing surfaces and the axis is 15°, and the height of the sealing surfaces on both sides of the V-shaped sealing anti-torsion shoulder (5) is higher than the extended sealing surface B (4) to form a circumferential anti-torsion shoulder.

4. The multi-seal couplingless threaded connection structure according to claim 3, characterized in that: The contact position between the second connecting end (2) and the shoulder of the first connecting end (1) transitions from an arc surface to a conical surface.

5. The multi-seal couplingless threaded connection structure according to claim 3, characterized in that: The first connecting end (1) and the second connecting end (2) are both provided with sealing surface A (6) and sealing surface B (7) at the mating contact position.

6. The multi-seal couplingless threaded connection structure according to claim 5, characterized in that: The sealing surface A (6) of the first connecting end (1) forms a conical angle surface (8) that mates with the V-shaped sealing anti-torsion shoulder formed on the second connecting end (2). The conical angle surface (8) is 150 degrees, and the angle between the two sealing surfaces of the conical angle surface (8) and the axis is 15°.

7. The multi-seal couplingless threaded connection structure according to claim 6, characterized in that: Two shoulders are formed on the first connecting end (1) and the second connecting end (2). The two shoulders include a main shoulder (9) and an auxiliary shoulder (10). The main shoulder (9) is close to the API trapezoidal side, and the auxiliary shoulder (10) is the contact end of the first connecting end (1) and the second connecting end (2).

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