Buckling hoop for buttress
By designing a 45-degree angle at the bottom of the shoulder and a rounded structure at the shoulder of the trapezoidal coupling, the problem of poor sealing between the oil casing and the coupling was solved, achieving resistance to yielding and deformation under high torque and meeting the over-torsion requirements of deep well mining.
Patent Information
- Application Number
- CN202521004580.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-21
- Publication Date
- 2026-04-21
- Estimated Expiration
- 2035-05-21
AI Technical Summary
The existing oil casing and couplings have poor sealing performance, and are prone to yielding deformation, especially under high torque, which cannot meet the requirements of anti-torsion capability for deep well oil extraction.
A trapezoidal coupling is designed with a 45-degree angle at the bottom of the shoulder and a rounded shoulder design to increase sealing and compressive strength. A forming tool is used to remove burrs and improve the smoothness of the connecting pipe.
It improves the sealing effect of oil casing and coupling, prevents yielding deformation under high torque, and ensures the smooth progress of deep well oil extraction.
Smart Images
Figure CN224149513U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of special pipes for oil extraction, and specifically relates to a trapezoidal snap coupling. Background Technology
[0002] As oil extraction becomes increasingly difficult both domestically and internationally, the depth of oil casing running into wells is also increasing. In particular, during shale gas extraction, pre-resistance to the casing is prone to occur downhole. Under such pre-resistance conditions, it is necessary to rotate the casing before running it into the well. This places higher demands on the threaded joints between the casing and the pipe to ensure sealing while maintaining a higher resistance to over-torsion.
[0003] To address the aforementioned issues, the most common solution in existing technology is to rotate the casing, connecting the oil casing to the coupling via API threads. This alters the friction between the casing and the pipe wall, reducing resistance and facilitating smooth casing lowering. However, ordinary API threaded connections suffer from gaps between the threads, resulting in poor sealing between the oil casing and the coupling. Furthermore, under high torque, the coupling end is prone to yielding deformation, further reducing the sealing effect between the oil casing and the coupling.
[0004] In view of the above factors, a trapezoidal coupling is provided, with a 45-degree angle at the bottom of the shoulder to increase the compressive strength. The rounded design of the shoulder makes the inner wall of the connecting pipe smoother, and can achieve the effect of high torque without sticking. Utility Model Content
[0005] The purpose of this utility model is to provide a trapezoidal snap coupling to solve the problems mentioned in the background art.
[0006] The purpose of this utility model is achieved through the following technical solution: a trapezoidal coupling, comprising a coupling, wherein a female connector is provided inside the coupling, and the female connector is connected to a male connector on the pipe;
[0007] The connecting female buckle includes a machine tightening shoulder, and a first connecting female buckle end and a second connecting female buckle end are respectively provided on both sides of the connecting female buckle. The first connecting female buckle end and the second connecting female buckle end are respectively connected to the finished tube.
[0008] The first end shoulder A is provided on the end of the connecting female buckle away from the machine tightening shoulder, and the side closer to the machine tightening shoulder cooperates with the second end shoulder C on the upper end of the connecting male buckle.
[0009] The first shoulder A of the female connector abuts against the first shoulder B of the male connector.
[0010] The side surfaces at both ends of the machine tensioning shoulder are sealing surfaces, and a tool relief groove is provided on the side closest to the machine tensioning shoulder.
[0011] Furthermore, the tightening shoulder is a tightening position shoulder, and the angle between the tightening shoulder and the radial plane is 0-5°. After tightening, it is flush with the inner hole of the male thread end.
[0012] Furthermore, the bottom of the machine clamping shoulder is set at a 45-degree angle to the threaded end of the connecting nut near the sealing surface.
[0013] Furthermore, the contact position between the shoulder of the machine clamping shoulder and the connecting male buckle is designed with an arc.
[0014] Furthermore, the first end shoulder A of the female connector has a trapezoidal cross-section that mates with the male connector.
[0015] Furthermore, the connecting female thread is provided with a square or non-square thread.
[0016] Furthermore, the bearing surface of the threaded connection is provided with a square thread profile and an inclined thread profile, and the upper and lower corners of the square thread profile and the inclined thread profile are provided.
[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0018] This utility model features an intermediate shoulder and a machine-tightening shoulder, which increases its sealing performance and effectively prevents the connecting female and male threads on the pipe from yielding and deforming under high torque. The shoulder of the coupling is a machine-tightening shoulder, with an angle of 0-5° to the radial plane. After machine tightening, the inner holes of the male and female ends are flush. The 45-degree angle at the bottom of the shoulder increases the compressive strength. The rounded design of the shoulder improves the smoothness of the inner wall of the connecting pipe. The bottom of the shoulder has a thread retraction tool, designed to use a forming tool to remove burrs, changing the previous method of deburring with a manual grinding wheel, which caused damage to the shoulder. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the coupling of this utility model;
[0020] Figure 2 This is a schematic diagram of the mating of the female and male connecting buckles of this utility model;
[0021] Figure 3 This is a schematic diagram of another state of the connection between the female and male buckles of this utility model.
[0022] Figure 4 This is a schematic diagram of the male connector of this utility model;
[0023] Figure 5 This is a utility model Figure 1 Cross-sectional view;
[0024] Figure 6 This is an enlarged schematic diagram of the machine tension shoulder of this utility model. Detailed Implementation
[0025] 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.
[0026] 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.
[0027] 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.
[0028] like Figure 1-6 As shown, a trapezoidal coupling is characterized in that it includes a coupling 1, wherein a female connector 2 is provided inside the coupling 1, and the female connector 2 is connected to a male connector 3 on the pipe.
[0029] The connecting female buckle 2 includes a machine tightening shoulder 4. A first connecting female buckle end 21 and a second connecting female buckle end 22 are respectively provided on both sides of the connecting female buckle 2. The first connecting female buckle end 21 and the second connecting female buckle end 22 are respectively connected to the finished tube.
[0030] The first end shoulder A5 is provided on the end of the connecting female buckle 2 away from the machine tension shoulder 4, and the side closer to the machine tension shoulder 21 cooperates with the second end shoulder C6 on the upper end of the connecting male buckle 3.
[0031] The first end shoulder A5 of the connecting female buckle 2 abuts against the first end shoulder B7 of the connecting male buckle 3.
[0032] The side surfaces at both ends of the machine tension shoulder 21 are sealing surfaces, and a tool relief groove 8 is provided on the side near the machine tension shoulder 21.
[0033] The machine tightening shoulder 4 is a machine tightening position shoulder. The angle between the machine tightening shoulder 4 and the radial plane is 0-5°. After machine tightening, it is flush with the inner hole of the connecting male buckle 3.
[0034] To facilitate increased compression strength during use, the shoulder is designed with a rounded arc to improve the smoothness of the inner wall of the connecting pipe. The bottom of the machine tightening shoulder 4 is set at a 45° angle to the threaded end of the connecting female buckle 2 near the sealing surface. The contact position between the shoulder of the machine tightening shoulder 4 and the connecting male buckle 3 is designed with a rounded arc.
[0035] To ensure overall sealing during use, the first shoulder A of the female connector 2 has a trapezoidal cross-section that mates with the male connector 3.
[0036] To improve tensile performance while ensuring sealing during use, the connecting nut 2 is provided with a square or non-square thread. The bearing surface of the thread of the connecting nut 2 is provided with a square thread profile or an inclined thread profile, and the upper and lower corners of the square thread profile and the inclined thread profile are provided.
[0037] 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.
[0038] 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 strap coupling, characterized by: The utility model provides a connecting nipple (1) which is internally provided with a connecting box (2) connected with a connecting pin (3) on a pipeline. The connecting box (2) comprises a machine shoulder (4), and the two sides of the connecting box (2) are respectively provided with a first connecting box end (21) and a second connecting box end (22), which are respectively connected with a finished pipe. The first end shoulder A (5) of the connecting box (2) is provided at an end away from the machine shoulder (4), and the side close to the machine shoulder (4) is matched with the second end shoulder C (6) at the upper end of the connecting pin (3). The first end shoulder A (5) of the connecting box (2) is in abutment with the first end shoulder B (7) of the connecting pin (3). The side vertical surface at the two ends of the machine shoulder (4) is a sealing surface, and a tool withdrawal groove (8) is arranged on the side close to the machine shoulder (4).
2. The bell and spigot coupling of claim 1, wherein: The machine shoulder (4) is a machine shoulder, and the angle between the machine shoulder (4) and a radial plane is 0-5°, and the machine shoulder (4) is flush with the inner hole at the end of the connecting pin (3) after being tightened.
3. The bell and spigot coupling of claim 2, wherein: The bottom of the machine shoulder (4) close to the sealing surface is provided with a 45° angle on one side of the threaded end of the connecting box (2).
4. The bell and spigot coupling of claim 3, wherein: The shoulder of the machine shoulder (4) is designed as a circular arc at the contact position with the connecting pin (3).
5. The bell and spigot coupling of claim 4, wherein: The first end shoulder A of the connecting box (2) is in a trapezoidal shape in cross section and is matched with the connecting pin (3).
6. The bell and spigot coupling of claim 5, wherein: The connecting box (2) in the connecting nipple (1) is provided with a thread, and the thread is a trapezoidal thread structure.
7. The bell and spigot coupling of claim 6, wherein: The thread of the connecting box (2) is a square or non-square thread.
8. The box coupling of claim 7, wherein: The bearing surface of the thread of the connecting box (2) is a square thread tooth type and an inclined tooth type, and the upper and lower round corners of the square thread tooth type and the inclined tooth type are provided.