Large-drift-diameter anti-erosion check valve for fracturing

Abstract

The utility model relates to the technical field of petroleum shale gas drilling and production, and discloses a large-drift-diameter anti-erosion check valve for fracturing, which comprises a valve body, a valve cover, a valve seat assembly, a valve plate, a pin shaft, a supporting seat, a sealing steel ring, a positioning pin, a rotating hanging ring, a bolt nut, a set screw and a pin shaft protecting sleeve, the sealing steel ring and the positioning pin are installed between the valve body and the valve cover, the valve body and the valve cover are fixedly installed, the large-drift-diameter anti-erosion check valve for fracturing is of a swing type structure, and the passing ability of large-flow fluid under the fracturing working condition is fully met. The integral valve plate structure is arranged in the check valve, so that the check valve has good erosion resistance and scouring resistance, and is particularly suitable for large-drift-diameter and high-flow occasions for fracturing. And all parts in the check valve can be pre-assembled, so that integral replacement is realized, and the field maintenance efficiency is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of oil shale gas drilling and production technology, specifically a large-diameter anti-erosion check valve for fracturing. Background Technology

[0002] After nearly a decade of development, China has gradually mastered shale gas exploration and development technologies suitable for its geological conditions, and its fracturing technology has become increasingly mature. Large-diameter check valves are an indispensable part of the entire fracturing operation process.

[0003] Due to the high flow rate, high pressure, and high sand content of fracturing operations, traditional check valves often suffer from internal valve plate erosion damage during actual use, resulting in the valve being unable to achieve one-way sealing. Furthermore, after the check valve is damaged, on-site repair is cumbersome and inefficient, seriously affecting the progress of on-site fracturing operations. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a large-diameter erosion-resistant check valve for fracturing. It adopts a swing-type structure, which fully meets the requirements for high-flow-rate fluid passage under fracturing conditions. The internal structure of the check valve is an integral valve plate structure, and the sealing parts are reinforced with hard alloy welding, which has better erosion resistance. At the same time, the internal parts of the check valve can be pre-assembled to achieve overall replacement, which greatly improves the efficiency of on-site maintenance.

[0005] This utility model provides the following technical solution: a large-diameter anti-erosion check valve for fracturing, comprising a valve body, a valve cover, a valve seat assembly, a valve plate, a pin, a support seat, a sealing steel ring, a positioning pin, a rotating ring, bolts and nuts, a set screw, and a pin protective sleeve. The sealing steel ring and the positioning pin are installed between the valve body and the valve cover, and the valve body and the valve cover are fixedly installed together. The valve seat assembly is threaded into the inside of the valve body and locked by the set screw. The valve plate is an integral valve plate with a rotating hole at the top. The pin protective sleeve is embedded in the rotating hole. The pin and the valve plate are both installed on the support seat, and the support seat is fixedly installed in the middle cavity of the valve body.

[0006] Preferred technical solution 1: The sealing steel ring is a metal seal.

[0007] Preferred technical solution 2: The valve body and the valve cover are connected by bolts and nuts.

[0008] Preferred technical solution three: The valve seat assembly consists of a valve seat body part, a lip seal, a rectangular seal, and a T-shaped seal.

[0009] Preferred technical solution four: The valve plate is an integral valve plate structure, the sealing area is hard alloy welded, and the upper rotating hole is elliptical; the pin shaft protective sleeve is an elliptical ring that matches the rotating hole and is made of a highly wear-resistant material.

[0010] Preferred technical solution five: The number of rotating lifting rings is two and they are installed on both sides of the valve cover.

[0011] Compared with the prior art, this utility model provides a large-diameter anti-erosion check valve for fracturing, which has the following beneficial effects: 1. The large-diameter anti-erosion check valve for fracturing of this invention adopts a swing-type structure, which fully meets the requirements for the passage of large flow of fluid under fracturing conditions.

[0012] 2. The large-diameter anti-erosion check valve for fracturing of the present invention adopts an internal integral valve plate structure, which has good erosion resistance and scouring resistance, and is especially suitable for large-diameter, high-flow fracturing applications.

[0013] 3. The internal components of the large-diameter anti-erosion check valve for fracturing of the present invention can be pre-assembled to achieve overall replacement, which greatly improves the efficiency of on-site maintenance. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the valve seat assembly structure of this utility model;

[0016] Figure 3 This is a partial schematic diagram of the valve plate of this utility model.

[0017] In the diagram: 1. Valve body; 2. Valve cover; 3. Valve seat assembly; 3a. Valve seat body parts; 3b. Lip seal parts; 3c. Rectangular seal; 3d. T-type seal; 4. Valve plate; 4a. Weld overlay; 5. Pin; 6. Support seat; 7. Sealing steel ring; 8. Locating pin; 9. Rotary lifting ring; 10. Bolt and nut; 11. Set screw; 12. Pin protective sleeve. Detailed Implementation

[0018] Please see Figure 1-3 ,

[0019] Example 1: A large-diameter anti-erosion check valve for fracturing includes a valve body 1, a valve cover 2, a valve seat assembly 3, a valve plate 4, a pin 5, a support seat 6, a sealing steel ring 7, a locating pin 8, a rotating ring 9, a bolt and nut 10, a set screw 11, and a pin protective sleeve 12. The sealing steel ring 7 and the locating pin 8 are installed between the valve body 1 and the valve cover 2, and the valve body 1 and the valve cover 2 are fixedly installed together. The valve seat assembly 3 is threaded into the inside of the valve body 1 and locked by the set screw 11. The valve plate 4 is an integral valve plate with a rotating hole on the upper part. The pin protective sleeve 12 is embedded in the rotating hole. The pin 5 and the valve plate 4 are both installed on the support seat 6, and the support seat 6 is fixedly installed in the middle cavity of the valve body 1.

[0020] Example 2: The difference between this example and Example 1 is that the sealing steel ring 7 is a metal seal, which makes the sealing performance more reliable. At the same time, the positioning pin 8 can reduce installation errors and improve installation efficiency.

[0021] Example 3: The difference between this example and Example 1 is that the valve body 1 and the valve cover 2 are connected by bolts and nuts 10, and the bolts and nuts provide sealing preload for the sealing steel ring 7.

[0022] Example 4: The difference between this example and Example 1 is that the valve seat assembly 3 is composed of valve seat body part 3a, lip seal 3b, rectangular seal 3c, and T-shaped seal 3d. The valve seat assembly can be pre-assembled to achieve overall replacement.

[0023] Example 5: The difference between this example and Example 1 is that the valve plate 4 is an integral valve plate structure, the sealing area is hard alloy welded 4a, and the upper rotating hole is elliptical; the pin shaft protective sleeve 12 is an elliptical ring that matches the rotating hole and is made of a highly wear-resistant material to improve the service life of the valve.

[0024] Example 6: The difference between this example and Example 1 is that there are two rotating lifting rings 9 installed on both sides of the valve cover 2 for lifting and transporting the entire valve.

[0025] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A large-diameter anti-erosion check valve for fracturing, comprising a valve body (1), a valve cover (2), a valve seat assembly (3), a valve plate (4), a pin (5), a support seat (6), a sealing steel ring (7), a positioning pin (8), a rotating lifting ring (9), bolts and nuts (10), set screws (11), and a pin protective sleeve (12), characterized in that: The sealing steel ring (7) and the positioning pin (8) are installed between the valve body (1) and the valve cover (2), and the valve body (1) and the valve cover (2) are fixedly installed together. The valve seat assembly (3) is installed inside the valve body (1) by thread and locked by the set screw (11). The valve plate (4) is an integral valve plate. The upper part of the valve plate (4) is provided with a rotating hole. The pin shaft protective sleeve (12) is embedded inside the rotating hole. The pin shaft (5) and the valve plate (4) are both installed on the support seat (6). The support seat (6) is fixedly installed in the middle cavity of the valve body (1).

2. The large-diameter anti-erosion check valve for fracturing according to claim 1, characterized in that: The sealing steel ring (7) is a metal seal.

3. The large-diameter anti-erosion check valve for fracturing according to claim 1, characterized in that: The valve body (1) and the valve cover (2) are connected by bolts and nuts (10).

4. The large-diameter anti-erosion check valve for fracturing according to claim 1, characterized in that: The valve seat assembly (3) consists of a valve seat body part (3a), a lip seal (3b), a rectangular seal (3c), and a T-shaped seal (3d).

5. A large-diameter anti-erosion check valve for fracturing according to claim 1, characterized in that: The valve plate (4) is an integral valve plate structure, and the sealing area is hard alloy welded (4a). The upper rotating hole is elliptical in shape. The pin shaft protective sleeve (12) is an elliptical ring that matches the rotating hole and is made of a highly wear-resistant material.

6. A large-diameter anti-erosion check valve for fracturing according to claim 1, characterized in that: The number of rotating lifting rings (9) is two and they are installed on both sides of the valve cover (2).

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