Wellhead fracturing tree four-way cross structure

Abstract

The utility model discloses a wellhead fracturing tree four -way structure, include: four -way structure body, the first pass of four -way structure body, the second pass, the third pass and the fourth pass are connected through the intercommunication cavity between, the first guide cambered surface recessed towards intercommunication cavity interior is arranged between intercommunication cavity and the second pass, the second guide cambered surface recessed towards intercommunication cavity interior is arranged between intercommunication cavity and the fourth pass, the first horizontal guide surface is arranged between intercommunication cavity and the first pass, the second horizontal guide surface is arranged between intercommunication cavity and the fourth pass, the first convex surface is arranged respectively in the connection included angle department of first pass and second pass of intercommunication cavity, the second convex surface is arranged in the connection included angle department of second pass and third pass, the third convex surface is arranged in the connection included angle department of third pass and fourth pass, the fourth convex surface is arranged in the connection included angle department of fourth pass and first pass. The structure design of the change of the intersecting line has reduced the bearing stress of four -way inner chamber greatly.

Description

Technical Field

[0001] This utility model relates to the field of oilfield production equipment technology, specifically to a wellhead fracturing tree four-way structure. Background Technology

[0002] Currently, wellhead fracturing trees require more durable fracturing products during the fracturing process.

[0003] The existing wellhead fracturing tree four-way structure has an intersection line inside the four-way connecting the middle part due to the processing. The intersection line inside the cavity is not easy to be rounded, resulting in great stress on the intersection line inside the four-way cavity.

[0004] To reduce the high stress inside the four-way joint of the wellhead fracturing tree structure, various new structures have emerged, such as embedded alloys, to increase the durability of the four-way joint during fracturing. However, this also increases the cost and the difficulty of the process. Utility Model Content

[0005] To overcome the above-mentioned defects of the prior art, the purpose of this utility model is to provide a four-way structure for wellhead fracturing tree.

[0006] Compared with existing technologies, the structure of this utility model has a lower manufacturing difficulty and can significantly save costs.

[0007] This invention significantly reduces the bearing stress in the inner cavity of the four-way structure of the wellhead fracturing tree by changing the structural design of the intersection line and the method of displacing the stress concentration point, making the inner cavity of the four-way structure of the wellhead fracturing tree more durable and resistant to high pressure during the fracturing process.

[0008] To achieve the purpose of this utility model, the technical solution adopted is as follows: A wellhead fracturing tree four-way structure includes: A four-way structure body, wherein the first, second, third and fourth passages of the four-way structure body are connected by a connecting cavity; A first guide arc surface that is recessed toward the interior of the connecting cavity is provided between the connecting cavity and the second passage; A second guide arc surface that is recessed toward the interior of the connecting cavity is provided between the connecting cavity and the fourth passage; A first horizontal guide surface is provided between the connecting cavity and the first passage; A second horizontal guide surface is provided between the connecting cavity and the fourth passage; The connecting cavity is provided with a first convex surface at the connection angle between the first passage and the second passage; A second convex surface is provided at the angle between the connection between the second and third passages; A third convex surface is provided at the angle between the connection between the third and fourth passages; A fourth convex surface is provided at the angle between the fourth passage and the first passage.

[0009] In a preferred embodiment of the present invention, the first guide arc surface and the second guide arc surface are symmetrical about the central axis of the first or fourth passage.

[0010] In a preferred embodiment of this utility model, the length of the connecting cavity is 400mm.

[0011] The beneficial effects of this utility model are as follows: The structure of this utility model has a low manufacturing difficulty and can significantly save costs.

[0012] This invention significantly reduces the bearing stress of the four-way cavity of the wellhead fracturing tree four-way structure by changing the structural design of the intersection line and the method of displacing the stress concentration point. The maximum internal stress is reduced to 232.8 MPa, making the four-way cavity of the wellhead fracturing tree four-way structure more durable and resistant to high pressure during the fracturing process. Attached Figure Description

[0013] Figure 1 This is a schematic diagram (including intersection lines) of the internal structure of the existing wellhead fracturing tree four-way structure.

[0014] Figure 2 This is a schematic diagram (including the intersection line) of the four-way structure of the wellhead fracturing tree of this utility model.

[0015] Figure 3 This is a schematic diagram of the stress distribution inside the existing wellhead fracturing tree cross-section structure (15000psi).

[0016] Figure 4 This is a schematic diagram of the stress distribution (15000psi) at the R5 rounded transition of the internal intersection line of the existing wellhead fracturing tree four-way structure.

[0017] Figure 5 This is a schematic diagram of the internal stress distribution (15000psi) of the four-way structure of the wellhead fracturing tree of this utility model. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit its scope. Furthermore, in the following descriptions, well-known structures and technologies have been omitted to avoid unnecessary confusion regarding the concept of this utility model.

[0019] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] like Figure 2 The diagram shows a four-way structure for a wellhead fracturing tree, which includes a four-way structure body 100. The first passage 101, the second passage 102, the third passage 103 and the fourth passage 104 of the four-way structure body 100 are connected by a cylindrical connecting cavity 105.

[0021] A first guide arc surface 105a is provided between the connecting cavity 105 and the second passage 102, which is recessed towards the inside of the connecting cavity 105.

[0022] A second guide arc surface 105b is provided between the connecting cavity 105 and the fourth passage 104, which is recessed towards the inside of the connecting cavity 105.

[0023] The first guide arc surface 105a and the second guide arc surface 105b are symmetrical about the central axis of the first passage 101 or the fourth passage 104.

[0024] A first horizontal guide surface 105c is provided between the connecting cavity 105 and the first channel 101, and a second horizontal guide surface 105d is provided between the connecting cavity 105 and the fourth channel 104.

[0025] The connecting cavity 105 is provided with a first convex surface 105e at the connection angle between the first channel 101 and the second channel 102.

[0026] The connecting cavity 105 is provided with a second convex surface 105f at the connection angle between the second passage 102 and the third passage 103.

[0027] The connecting cavity 105 has a third convex surface 105g at the angle between the connection of the third passage 103 and the fourth passage 104.

[0028] The connecting cavity 105 has a fourth convex surface 105h at the angle between the fourth passage 104 and the first passage 101.

[0029] contrast Figure 1 It can be seen that, Figure 2 The new structure makes the internal intersection lines clearer and simpler.

[0030] Assuming a pressure of 15,000 psi is applied inside the four-way valve, Figure 3The stress distribution inside the existing wellhead fracturing tree cross structure is shown. The maximum internal stress is 263.7 MPa, and the maximum stress is concentrated on the intersection line.

[0031] Figure 4 The stress distribution of the intersection line R5 rounded transition inside the four-way structure of the wellhead fracturing tree in the existing technology is clearly shown. It can be seen that after the intersection line is rounded by R5, the maximum internal stress is 255.7 MPa. The maximum stress is reduced, but the rounded R5 transition is difficult to process in actual manufacturing, and the dimensions are also difficult to guarantee.

[0032] Figure 5 The internal stress distribution of the wellhead fracturing tree four-way structure of this utility model is shown. Obviously, the maximum internal stress has been reduced to 232.8 MPa, and it can be clearly seen that the stress points have been dispersed to various locations, which improves the durability of the product.

[0033] This invention, through a structural design that alters the intersection line, controls the outer diameter and length of the machinable connecting cavity 105, significantly reducing the stress intensity at stress concentration points and shifting high-stress points to other locations. This greatly reduces the bearing stress of the four-way inner cavity of the wellhead fracturing tree four-way structure, lowering the maximum internal stress to 232.8 MPa. Consequently, the four-way inner cavity of the wellhead fracturing tree four-way structure becomes more durable and resistant to high pressure during fracturing.

[0034] Compared with existing technologies, this utility model only requires a slight change in the internal structure design, which greatly reduces the load-bearing capacity of the product, making the four-way product better used in fracturing trees. The manufacturing process is simple and can significantly save costs.

[0035] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope. All such changes and modifications fall within the scope of this utility model as defined by the appended claims and their equivalents.

Claims

1. A four-way structure for wellhead fracturing trees, characterized in that, include: A four-way structure body, wherein the first, second, third and fourth passages of the four-way structure body are connected by a connecting cavity; A first guide arc surface that is recessed toward the interior of the connecting cavity is provided between the connecting cavity and the second passage; A second guide arc surface that is recessed toward the interior of the connecting cavity is provided between the connecting cavity and the fourth passage; A first horizontal guide surface is provided between the connecting cavity and the first passage; A second horizontal guide surface is provided between the connecting cavity and the fourth passage; The connecting cavity is provided with a first convex surface at the connection angle between the first passage and the second passage; A second convex surface is provided at the angle between the connection between the second and third passages; A third convex surface is provided at the angle between the connection between the third and fourth passages; A fourth convex surface is provided at the angle between the fourth passage and the first passage.

2. The wellhead fracturing tree four-way structure as described in claim 1, characterized in that, The first guide arc surface and the second guide arc surface are symmetrical about the central axis of the first or fourth passage.

Images