Sand prevention fracturing valve for fracturing wellhead

Abstract

A sand prevention fracturing valve for a fracturing wellhead relates to the technical field of fracturing valves and comprises a main valve body and a plurality of auxiliary valve bodies, and the auxiliary valve bodies are communicated with the main valve body. A sealing ring is arranged between the connecting disc at the end of the main valve body and the connecting disc at the end of the auxiliary valve body and comprises a sealing body, and the upper end and the lower end of the sealing body are provided with an upper sealing face and a lower sealing face respectively. The section of the upper sealing face is of an isosceles trapezoid structure, the inclination angles of the two bevel edges of the upper sealing face are consistent with the inclination angles of the outer end faces of the connecting discs of the main valve body and the auxiliary valve body respectively, and the section of the lower sealing face is of a linear structure. The two sides of the sealing body are provided with semi-arc protrusions in a mirror image mode, and grooves matched with the semi-arc protrusions are formed in the inner end face of the connecting disc of the main valve body and the inner end face of the connecting disc of the auxiliary valve body. According to the sealing ring structure, three-stage sealing can be achieved, and the sealing performance is further improved.

Description

Technical Field

[0001] This utility model relates to the field of fracturing valve technology, specifically to a sand-proof fracturing valve for fracturing wellheads. Background Technology

[0002] Hydraulic fracturing utilizes a high-pressure pump on the surface to inject a high-viscosity fracturing fluid into the oil reservoir through the wellbore. When the injection rate of the fracturing fluid exceeds the reservoir's absorption capacity, a very high pressure is created at the bottom of the well. When this pressure exceeds the fracturing pressure of the rock in the nearby reservoir, the reservoir is forced open, creating fractures. After fracturing, the production of oil and gas wells typically increases significantly. Fracturing valves are used during the fracturing process. These valves are stably connected using connectors to ensure stability between the main valve body and the auxiliary valve body.

[0003] In the prior art, such as the Chinese utility model patent with publication number CN202746646U, a double thrust gasket ball valve is disclosed, including a main valve body, a secondary valve body, valve body connecting bolts, and valve body sealing gaskets. The main valve body is fixed to the secondary valve body by the valve body connecting bolts, and the valve body sealing gasket is located between the main valve body and the secondary valve body. In this utility model patent, the main valve body and the secondary valve body are connected by bolts. In order to ensure sealing, a sealing gasket is set between the main valve body and the secondary valve body. Due to the high-speed impact pressure of the fluid, vibration will be generated, which can easily lead to sealing failure and leakage. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a sand-proof fracturing valve for fracturing wellheads, which can solve the above technical problems.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A sand-control fracturing valve for fracturing wellheads includes a main valve body and multiple auxiliary valve bodies, all of which are connected to the main valve body. A sealing ring is provided between the connecting disc at the end of the main valve body and the connecting disc at the end of the auxiliary valve bodies. The sealing ring includes a sealing body, with an upper sealing surface and a lower sealing surface at its upper and lower ends, respectively. The upper sealing surface has an isosceles trapezoidal cross-section, and the two inclined sides of the upper sealing surface are inclined at the same angle as the outer end faces of the connecting discs of the main valve body and the auxiliary valve bodies. The lower sealing surface has a straight cross-section. Semi-circular protrusions are mirrored on both sides of the sealing body, and grooves that mate with the semi-circular protrusions are formed on the inner end faces of the connecting discs of the main valve body and the auxiliary valve bodies.

[0007] Preferably, a clamp is provided on the outer side of the connection between the main valve body and the auxiliary valve body; the clamp includes an upper clamp and a lower clamp, which are connected by bolts and wing nuts, and rubber shock-absorbing pads are provided on the inner surfaces of the upper clamp and the lower clamp.

[0008] Preferably, the inner surface of the rubber shock-absorbing pad is provided with a plurality of rubber blocks, and the plurality of rubber blocks are distributed in an equidistant array.

[0009] Preferably, the widths of the rubber block, the rubber shock-absorbing pad, and the clamp are all equal.

[0010] Preferably, a washer is provided between the bolt and the lower clamp.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] The sealing ring structure of this invention can achieve three-level sealing, further improving sealing performance and reducing the impact of vibration on the seal.

[0013] This invention reduces vibration and ensures connection stability by setting rubber shock-absorbing pads and rubber blocks on the inner surface of the clamp; at the same time, clamp connection is more convenient to assemble and disassemble than bolt connection. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a cross-sectional view of the sealing ring structure of this utility model;

[0017] Figure 3 This is a cross-sectional view of the connection between the main valve body and the auxiliary valve body of this utility model.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1-Main valve body, 2-Sub-valve body, 3-Sealing ring, 31-Sealing body, 32-Upper sealing surface, 33-Lower sealing surface, 34-Protrusion, 4-Groove, 5-Clamp, 51-Upper clamp, 52-Lower clamp, 53-Bolt, 54-Wing nut, 55-Rubber shock absorber, 56-Rubber block. Detailed Implementation

[0020] The invention will now be described in detail with reference to the accompanying drawings, by way of example. Obviously, the described embodiments are only some embodiments of the invention, and not all embodiments.

[0021] like Figures 1 to 3As shown, this utility model discloses a sand-proof fracturing valve for fracturing wellheads, including a main valve body 1 and two auxiliary valve bodies 2. The two auxiliary valve bodies 2 are distributed on both sides of the main valve body 1 and are both connected to the main valve body 1. A sealing ring 3 is provided between the connecting disc at the end of the main valve body 1 and the connecting disc at the end of the auxiliary valve body 2. The sealing ring 3 includes a sealing body 31. The upper and lower ends of the sealing body 31 are respectively provided with an upper sealing surface 32 and a lower sealing surface 33. The cross-section of the upper sealing surface 32 is an isosceles trapezoidal structure. The two inclined sides of the upper sealing surface 32 are respectively inclined at the same angle as the outer end face of the connecting disc of the main valve body 1 and the auxiliary valve body 2. The cross-section of the lower sealing surface 33 is a straight line structure. The two sides of the sealing body 31 are provided with semi-circular arc protrusions 34. The inner end face of the connecting disc of the main valve body 1 and the auxiliary valve body 2 is provided with grooves 4 that cooperate with the semi-circular arc protrusions 34. This utility model uses an upper sealing surface 32 to seal the outer side of the connecting plate, a semi-circular protrusion 34 to seal the middle of the connecting plate, and a lower sealing surface 33 to seal the inner side of the connecting plate. These three seals further improve the sealing performance, prevent leakage, and ensure the smooth progress of fracturing operations.

[0022] Furthermore, in this embodiment, a clamp 5 is provided on the outer side of the connection between the main valve body 1 and the auxiliary valve body 2; the clamp 5 includes an upper clamp 51 and a lower clamp 52, which are connected by bolts 53 and wing nuts 54, and an anti-loosening washer is provided between the bolts 53 and the lower clamp 52; rubber shock-absorbing pads 55 are provided on the inner surfaces of both the upper clamp 51 and the lower clamp 52, and a plurality of rubber blocks 56 are provided on the inner surface of the rubber shock-absorbing pads 55. The plurality of rubber blocks 56 are distributed in an equidistant array. By providing rubber shock-absorbing pads 55 and rubber blocks 56, vibration can be reduced, connection stability can be ensured, and sealing failure can be avoided. The widths of the rubber blocks 56, rubber shock-absorbing pads 55, and clamp 5 are all equal.

[0023] During connection, place the protrusion 34 on one side of the sealing body 31 into the groove 4 of the connecting plate of the auxiliary valve body 2, and then align it with the connecting plate of the main valve body 1. At this time, the upper sealing surface 32 and the lower sealing surface 33 of the sealing ring 3 are respectively attached to the outer and inner sides of the connecting plate. Then, the upper clamp 51 and the lower clamp 52 are fitted onto the outer side of the connecting plate, and the rubber block 56 is tightly attached to the connecting plate and the upper sealing surface 32. Finally, it is locked by bolts 53 and wing nuts 54.

[0024] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and application concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A sand control fracturing valve for fracturing wellhead, comprising a main valve body (1) and a plurality of auxiliary valve bodies (2), the plurality of auxiliary valve bodies (2) are all communicated with the main valve body (1); characterized in that: The sealing ring (3) is arranged between the connecting disc at the end of the main valve body (1) and the connecting disc at the end of the auxiliary valve body (2), the sealing ring (3) comprises a sealing body (31), the upper and lower ends of the sealing body (31) are respectively provided with an upper sealing surface (32) and a lower sealing surface (33); the two sides of the sealing body (31) are mirror-symmetrically provided with semicircular arc protrusions (34), the inner end faces of the connecting discs of the main valve body (1) and the auxiliary valve body (2) are both provided with grooves (4) matched with the semicircular arc protrusions (34); The outer side of the connecting position of the main valve body (1) and the auxiliary valve body (2) is provided with a clamp (5); the clamp (5) comprises an upper clamp (51) and a lower clamp (52), the upper clamp (51) and the lower clamp (52) are connected through a bolt (53) and a butterfly nut (54), the inner surfaces of the upper clamp (51) and the lower clamp (52) are both provided with rubber shock-absorbing pads (55); The inner surface of the rubber shock-absorbing pad (55) is provided with a plurality of rubber blocks (56), the plurality of rubber blocks (56) are equidistantly arrayed.

2. The sand fracturing valve for fracturing wellhead as claimed in claim 1, wherein: The widths of the rubber block (56), the rubber shock-absorbing pad (55) and the clamp (5) are equal.

3. The sand fracturing valve for fracturing wellhead as claimed in claim 1, wherein: The bolt (53) and the lower clamp (52) are provided with a gasket.

4. The sand fracturing valve for fracturing wellhead as claimed in claim 1, wherein: The cross section of the upper sealing surface (32) is isosceles trapezoidal structure, the two oblique sides of the upper sealing surface (32) are respectively provided with the same inclination angle as the outer end faces of the connecting discs of the main valve body (1) and the auxiliary valve body (2).

5. The sand fracturing valve for fracturing wellhead as claimed in claim 1, wherein: The cross section of the lower sealing surface (33) is a one-letter type structure.

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