A Christmas tree clamp for use in an oil production wellhead

Abstract

The utility model provides a kind of Christmas tree clamp for oil production wellhead, including second clamp, the both ends of second clamp are rotatably connected with first clamp, second clamp and two first clamps form circular ring structure, and the central angle of second clamp and first clamp is 120 °, second clamp and first clamp are integrally formed.The utility model, set three half formula, improve the easy machinability of clamp.

Description

Technical Field

[0001] This utility model relates to the field of clamp technology, and in particular to a tree clamp for oil wellheads. Background Technology

[0002] The wellhead is a device used to extract oil in flowing wells and mechanically operated wells. It is the main equipment at the top of an oil and gas well for controlling and regulating oil and gas production, and mainly consists of three parts: the casing head, the tubing head, and the wellhead itself.

[0003] The clamps used on the production tree must withstand high pressure and extreme environmental stress to ensure the sealing and stability of the pipeline connection. They are generally made of 35CrMo material and obtained through die forging. A common clamp is the one described in the patent subject "Clamp," application number "CN202220618653.6." In this design, the clamp has a two-part structure. If produced using the same die forging method, the billet would undergo multiple forging processes. Furthermore, the billet is generally a block shape, and the two-part structure requires significant changes to the billet's dimensions. Therefore, it suffers from drawbacks such as numerous forging operations and poor surface quality due to metal fatigue.

[0004] The patent subject is "clamp-type clamping device", application number "CN201410698736.0". It is assembled with multiple parts and is equipped with two hinge connecting pins. The above-mentioned two-half clamp can be called a three-half clamp. However, due to the assembly of multiple parts, there are problems such as structural attachment reliability. Utility Model Content

[0005] To address the aforementioned problems, this utility model discloses a wellhead tree clamp, comprising a second clamp, with first clamps rotatably connected to both ends of the second clamp. The second clamp and the two first clamps form a circular structure, and the central angle of both the second clamp and the first clamps is 120°. Both the second clamp and the first clamp are integrally formed. Traditional clamps are mostly two-part structures; this utility model adopts a half-part structure, which facilitates die forging manufacturing.

[0006] The inner wall of the annular structure formed by the second clamp and the first clamp is provided with a groove, and a copper sleeve is provided inside the groove, the copper sleeve being open. That is, when installing the first clamp and the second clamp, the copper sleeve is first fitted onto the end of the pipe fitting.

[0007] The second clamp includes a second clamp body, with third connecting ears at both ends. The first clamp includes a first clamp body, with a second connecting ear on the side wall of one end of the first clamp body, and the second connecting ear engages with an opening in the middle of the third connecting ear. A rotating shaft is inserted through the second and third connecting ears. The rotation of the first and second clamps is achieved through the rotating shaft, the second connecting ear, and the third connecting ear.

[0008] A first connecting lug is fixedly connected to the other side wall of the first clamp body. The first connecting lug is provided with a through hole, and an internal hexagon bolt is inserted into the through hole. The other end of the internal hexagon bolt is threaded with a nut. The internal hexagon bolt and the nut are used to connect adjacent first clamps, thereby fixing the clamps to the pipe fitting.

[0009] The beneficial effects of this utility model are as follows: 1. The clamp is divided into three main parts, which facilitates die forging and manufacturing and meets the requirements for use on the wellhead. In addition, this utility model can be installed by tightening a single hexagonal bolt, which has the advantage of ease of use.

[0010] 2. A copper sleeve is provided to protect the inner seal. Attached Figure Description

[0011] Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 This is a three-dimensional schematic diagram of the first clamp of this utility model; Figure 3 This is a three-dimensional schematic diagram of the second clamp of this utility model; Figure 4 This is a three-dimensional schematic diagram of the copper sleeve of this utility model; Figure 5 This is a front view of the second clamp of this utility model; Figure 6 This is a front view of a standard clamp structure.

[0012] List of reference numerals in the attached diagram: 1. Socket head cap screw; 2. First clamp; 3. Shaft; 4. Second clamp; 5. Brass sleeve; 21. First connecting ear; 22. Through hole; 23. First hoop; 24. Second connecting ear; 41. Second hoop; 42. Third connecting ear. Detailed Implementation

[0013] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to the directions in the accompanying drawings, and the terms "inner" and "outer" refer to the directions toward or away from the geometric center of a specific component, respectively.

[0014] like Figures 1 to 6As shown, an oil wellhead tree clamp includes a second clamp 4, with first clamps 2 rotatably connected to both ends of the second clamp 4. The second clamp 4 and the two first clamps 2 form a ring structure, which is used to clamp onto the pipe fitting. The central angle of the second clamp 4 and the first clamp 2 is 120° to minimize the deformation of the forging. The second clamp 4 and the first clamp 2 are both integrally formed.

[0015] like Figure 5 and Figure 6 As shown, when the inner and outer diameters of the clamp are equal, the height of the existing two-half type is H, while in this utility model, the height is h. In the figure, h is less than H. Since the clamp used in the oil wellhead requires die forging, by reducing the height, the deformation scale is small during the die forging process, thus improving the processing quality.

[0016] The inner wall of the annular structure formed by the second clamp 4 and the first clamp 2 is provided with a groove, and a copper sleeve 5 is provided inside the groove. The copper sleeve 5 has an opening. The opening allows the copper sleeve 55 to be pre-fitted onto the pipe fitting before the first clamp 2 and the second clamp 4 are fixed. Copper is relatively soft and can protect the inner seal.

[0017] The second clamp 4 includes a second clamp body 41, with third connecting ears 42 at both ends. The first clamp 2 includes a first clamp body 23, with a second connecting ear 24 on the side wall of one end of the first clamp body 23. The second connecting ear 24 fits into the opening in the middle of the third connecting ear 42. A rotating shaft 3 is inserted through the second connecting ear 24 and the third connecting ear 42. The first clamp 2 and the second clamp 4 are rotatably connected through the second connecting ear 24, the third connecting ear 42, and the rotating shaft 3. In addition, the end of the rotating shaft 3 is deformed by stamping to prevent it from falling off the second connecting ear 24 and the third connecting ear 42.

[0018] The other end of the first clamp 23 is fixedly connected to a first connecting ear 21. The first connecting ear 21 is provided with a long through hole 22. The long through hole 22 is provided so that when the two first clamps 2 are connected, the first connecting ears 21 are not parallel. An internal hex bolt 1 is inserted through the long through hole 22. That is, the long through hole 22 is long enough to facilitate the insertion of the internal hex bolt 1. The other end of the internal hex bolt 1 is threaded with a nut, and the fixed connection is achieved by the mating nut.

[0019] The technical means disclosed in this utility model are not limited to the technical means disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features.

Claims

1. A wellhead Christmas tree clamp, characterized in that, It includes a second clamp (4), both ends of which are rotatably connected to a first clamp (2). The second clamp (4) and the two first clamps (2) form a ring structure, and the central angle of the second clamp (4) and the first clamp (2) is 120°. The second clamp (4) and the first clamp (2) are both integrally formed.

2. The wellhead Christmas tree clamp according to claim 1, characterized in that: The inner wall of the ring structure formed by the second clamp (4) and the first clamp (2) is provided with a buckle groove, and a copper sleeve (5) is provided inside the buckle groove, and the copper sleeve (5) is open.

3. The wellhead Christmas tree clamp according to claim 1, characterized in that: The second clamp (4) includes a second clamp body (41), and both ends of the second clamp body (41) are provided with third connecting ears (42). The first clamp (2) includes a first clamp body (23), and a second connecting ear (24) is provided on the side wall of one end of the first clamp body (23). The second connecting ear (24) fits into the opening in the middle of the third connecting ear (42). A rotating shaft (3) is inserted through the second connecting ear (24) and the third connecting ear (42).

4. The wellhead Christmas tree clamp according to claim 3, characterized in that: The other side wall of the first hoop (23) is fixedly connected to a first connecting ear (21), and a long through hole (22) is provided on the first connecting ear (21). An internal hex bolt (1) is inserted in the long through hole (22), and a nut is provided at the other end of the internal hex bolt (1) with thread engagement.

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