A valve with sand control function

Abstract

The application discloses a valve with sand prevention function and a method, which comprises a valve body seat, a valve plate and valve seats, the valve plate and the valve seats are arranged in the cavity of the middle part of the valve body seat, the valve seat is provided with two valve seats which are symmetrically arranged on the two sides of the valve plate, the middle part of the valve body seat is provided with a valve body seat hole, the middle part of the valve plate is provided with a valve plate passage hole, the middle part of the valve seat is provided with a valve seat hole, the valve body seat hole, the valve plate passage hole and the valve seat hole correspond to each other, one side of the valve seat is a front end face, the other side of the valve seat is a rear end face, the outer edge of the rear end face is provided with a groove, and a floating sealing piece is arranged in the groove; the top end of the valve seat is provided with a fixed sand prevention plate on the side close to the rear end face, the top end of the valve seat is provided with a floating sand prevention plate on the side close to the front end face, and a spring is arranged between the fixed sand prevention plate and the floating sand prevention plate; through the arrangement of the overall structure, the granular matters in the pipeline, especially the fracturing sand, can be prevented from entering the valve cavity, so that the valve has the sand prevention function.

Description

Technical Field

[0001] This invention relates to the field of valve-related technology, specifically to a valve with sand-proof function. Background Technology

[0002] Shale gas and shale oil extraction requires formation fracturing operations. Throughout the fracturing process, ultrafine fracturing sand, typically 0.08-0.12 mm in diameter, is used. However, the gaps between the valve plate, seat, and body of the valves used in shale gas and oil extraction, especially fracturing valves, are much larger than the diameter of the fracturing sand. Therefore, a large amount of sand enters the valve cavity during operation, causing valve sealing failure. Sometimes, the valve becomes completely filled with sand before the entire fracturing operation is finished, requiring complete disassembly and sand removal. In emergencies, severe sand ingress can cause valves to fail to close properly, leading to injuries. To ensure the continued operation of fracturing, it is sometimes necessary to periodically remove sand from the fracturing valves. This process is time-consuming, labor-intensive, and disrupts the fracturing process. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a valve with sand-proof function.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0005] This invention discloses a valve with sand-proof function, comprising a valve body seat, a valve plate, and a valve seat. The valve plate and valve seat are both disposed within a cavity in the middle of the valve body seat. Two valve seats are provided, symmetrically arranged on both sides of the valve plate. A valve body seat hole is provided in the middle of the valve body seat, a valve plate channel hole is provided in the middle of the valve plate, and a valve seat hole is provided in the middle of the valve seat. The valve body seat hole, valve plate channel hole, and valve seat hole correspond to each other. One side of the valve seat is a front end face, and the other side is a rear end face. A groove is provided on the outer edge of the rear end face, and a floating seal is provided within the groove. A fixed sand-proof plate is provided on the top of the valve seat near the rear end face, and a floating sand-proof plate is provided on the top of the valve seat near the front end face. A spring is provided between the fixed sand-proof plate and the floating sand-proof plate.

[0006] As a preferred embodiment of the present invention, a metal anti-extrusion retaining ring is provided on the outer wall of the outer ring of the floating seal.

[0007] As a preferred embodiment of the present invention, the inner ring wall of the floating seal is provided with a metal support ring.

[0008] As a preferred embodiment of the present invention, the metal support ring is provided with a plurality of pressure grooves arranged in a ring array.

[0009] As a preferred embodiment of the present invention, the floating seal has a convex surface on its outer side, which is disposed between the metal anti-extrusion retaining ring and the metal support ring.

[0010] As a preferred embodiment of the present invention, the outer ring of the front end face of the valve seat is provided with an annular groove.

[0011] The beneficial effects of this invention are as follows:

[0012] 1. Through special design of the valve seat, floating seal and floating sandproof plate, the valve changes from a static state to a floating state under working pressure. This changes the valve's outlet end seal to an inlet end seal, thus preventing particles, especially fracturing sand, from entering the valve cavity under working pressure, giving the valve a sandproof function.

[0013] 2. The valve seat, floating seal, and floating sand guard all have a floating effect, which makes the valve's sealing capacity increase with the increase of working pressure. The higher the pressure, the more reliable the seal.

[0014] 3. When there is no pressure in the cavity, the valve seat, floating seal, and floating sandproof plate can return to their initial state on their own without external intervention, ensuring the normal and long-term use of the sandproof valve.

[0015] 4. Unlike other valves, it generally does not require complete disassembly for maintenance. Simply flush the valve cavity with clean water through the grease inlet. Maintenance is simple and can reduce maintenance costs for users. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of the stress analysis structure of a valve with a sealed outlet end during operation;

[0018] Figure 2 This is a schematic diagram of the working state of a valve with the outlet end sealed;

[0019] Figure 3 This is a schematic diagram of a valve with an outlet seal installed.

[0020] Figure 4 This is a schematic diagram of the stress analysis structure of a valve with an inlet-end seal during operation;

[0021] Figure 5 This is a schematic diagram of the working state of a valve with an inlet-end seal;

[0022] Figure 6This is a schematic diagram of the movement of sand-containing fluid during the opening or closing of an existing valve;

[0023] Figure 7 This is a schematic diagram of the structure of a valve with sand-proof function according to the present invention;

[0024] Figure 8 This is a schematic diagram of the valve seat structure of a valve with sand prevention function according to the present invention;

[0025] Figure 9 This invention relates to a valve with sand-proof function. Figure 8 Enlarged view of point A in the middle;

[0026] Figure 10 This is a schematic diagram of the side structure of the metal support ring of a valve with sand prevention function according to the present invention.

[0027] In the diagram: 1. Valve body seat; 2. Valve plate; 3. Valve seat; 4. Front end face; 5. Rear end face; 6. Groove; 7. Floating seal; 8. Fixed sandproof plate; 9. Floating sandproof plate; 10. Spring; 11. Metal anti-extrusion retaining ring; 12. Metal support ring; 13. Pressure inlet groove; 14. Valve body seat hole; 15. Valve seat hole; 16. Valve plate channel hole. Detailed Implementation

[0028] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0029] Example: An analysis of the existing valve structure is as follows;

[0030] 1. For example Figure 1-2 As shown, under operating pressure, for a valve with an outlet-sealed valve, the thrust causes the valve plate to move towards the outlet-end valve seat. Under this force transmission, the front sealing surface of the outlet-end valve seat contacts the valve plate, and the rear end face of the outlet-end valve seat contacts the valve body seat hole end face. This causes all design errors between the valve body, valve seat, and valve plate to accumulate at the inlet end. Furthermore, under operating pressure, the front face of the inlet-end valve seat will detach from the valve plate and move towards the valve body seat hole end face, eventually contacting each other. This results in the maximum clearance between the front face of the inlet-end valve seat and the valve plate. Figure 3As shown, a metal-to-metal seal is formed between the front face of the outlet valve seat and the valve plate. The non-metallic seal between the rear face of the outlet valve seat and the end face of the valve body seat bore is generally a lip seal. Similarly, the non-metallic seal between the rear face of the inlet valve seat and the end face of the valve body seat bore is also generally a lip seal. For valves with outlet-end sealing, a non-metallic lip seal is generally used between the end face of the valve body seat bore and the rear face of the valve seat. The lip seal is generally stationary in the flat groove of the rear face of the valve seat, and the transition seal between the valve body and the valve seat is ensured by the interference fit of the lip seal. When using a lip seal, the clearance between the valve body, valve seat, and valve plate must be strictly controlled. If the clearance is too large, particles in the pipeline will enter the valve cavity through the clearance. If the clearance is too small, it will affect the valve installation and the valve's opening torque.

[0031] 2. For example Figure 3-4 As shown, under working pressure, for a valve with an inlet-end seal, the valve plate is stationary. The thrust pushes the inlet-end valve seat towards the valve plate and into contact. The rear end face of the inlet-end valve seat does not contact the valve body seat hole cross-section, and there will be a gap. However, the gap is only 1 / 2 of the gap of the outlet-end valve. For the outlet-end valve seat, if the valve is closed, the front end face of the valve seat will be in close contact with the valve plate under the force, and the contact pressure is not very large. If the valve is open, the front end face of the valve seat will contact the valve plate under the interference thrust of the sealing element. The rear end face of the outlet-end valve seat does not contact the valve body seat hole cross-section, and there will be a gap. However, the gap is only 1 / 2 of the gap of the outlet-end valve.

[0032] 3. For example Figure 5 As shown, during the opening and closing process of the valve, the valve cavity will be connected to the valve channel hole through the valve plate channel hole, and sand will enter the valve cavity at this time.

[0033] Based on the above analysis of the valve structure, it is believed that three problems need to be solved to achieve the valve's sand-proof function. First, the seal at the valve outlet must be changed to a seal at the valve inlet. Second, the seal between the rear end face of the valve seat and the valve body must be improved. Third, sand must be prevented from entering the valve cavity during opening and closing. Once these three problems are solved, the valve's sand-proof function can be achieved.

[0034] like Figure 1As shown, this invention discloses a valve with sand-proof function, comprising a valve body seat 1, a valve plate 2, and a valve seat 3. The valve plate 2 and valve seat 3 are both disposed within the cavity in the middle of the valve body seat 1. Two valve seats 3 are provided, symmetrically arranged on both sides of the valve plate 2. A valve body seat hole 14 is provided in the middle of the valve body seat 1, a valve plate channel hole 16 is provided in the middle of the valve plate 2, and a valve seat hole 15 is provided in the middle of the valve seat 3. The valve body seat hole 14, the valve plate channel hole 16, and the valve seat hole 15 correspond to each other. One side of the valve seat 3 is a front end face 4. The valve seat 3 appears as a disc, but is rectangular in a partial cross-sectional view. An annular groove 17 is provided on the outer circumference of the front end face 4 of the valve seat 3. The annular groove 17 is close to the outer circle of the valve seat 3 and away from the valve seat hole 15. A sealing surface is provided at the front end of the valve seat 3. The sealing surface is relatively narrow, close to the valve seat hole 15, and away from the outer circle of the valve seat 3. The other side of the valve seat 3 is a rear end face 5. A groove 6 is provided on the outer edge of the rear end face 5. A floating seal 7 is provided within the groove 6. A metal anti-extrusion retaining ring 11 is provided on the outer wall of the outer ring of the floating seal 7. A metal support ring 12 is provided on the inner wall of the floating seal 7. Multiple pressure grooves 13 are arranged in a ring array on the metal support ring 12 to improve the positioning capability of the planar floating seal in the planar groove and ensure that the planar floating seal will not fall off the valve seat during installation. A convex surface is provided on the outer side of the floating seal 7, positioned between the metal anti-extrusion retaining ring 11 and the metal support ring 12. Because the floating seal 7 is an interference fit, it pushes the valve seat 3 towards the valve plate 2 when there is no working pressure, causing an initial specific pressure to be established between the valve seat 3 and the valve plate 2. At the same time, the floating seal 7 contacts the end face of the valve body seat 1, forming a transition seal between the rear end face 5 of the valve seat 3 and the end face of the valve body seat 1. Once the valve is under working pressure, the valve seat 3 itself converts the working pressure into thrust, pushing the front end face 4 of the valve seat 3 to fit tightly against the valve plate 2. The degree of fit increases with the pressure, thus isolating the valve body seat hole 14 from the valve cavity passage, thus forming an inlet end seal. A fixed sandproof plate 8 is provided on the side of the top of the valve seat 3 near the rear end face 5, and a floating sandproof plate 9 is provided on the side of the top of the valve seat 3 near the front end face 4. A spring 10 is provided between the fixed sandproof plate 8 and the floating sandproof plate 9. The fixed sandproof plate 8 is always fixed, and under the elastic force of the spring 10, the floating sandproof plate 9 is always in contact with the valve plate 2, isolating the conduction between the valve cavity and the main passage when the valve is opened or closed. With the above structural configuration, and through the special design of the external structure of the valve seat 3, floating seal 7 and floating sandproof plate 9, the valve changes from a static state to a floating state under working pressure. This changes the valve's outlet end seal to an inlet end seal, thus preventing particles, especially fracturing sand, from entering the valve cavity under working pressure, giving the valve a sandproof function.

[0035] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A valve with sand-proof function, comprising a valve body seat (1), a valve plate (2), and a valve seat (3), wherein the valve plate (2) and the valve seat (3) are both disposed in the cavity in the middle of the valve body seat (1), two valve seats (3) are provided, and the two valve seats (3) are symmetrically disposed on both sides of the valve plate (2), a valve body seat hole (14) is provided in the middle of the valve body seat (1), a valve plate channel hole (16) is provided in the middle of the valve plate (2), and a valve seat hole (15) is provided in the middle of the valve seat (3), wherein the valve body seat hole (14), the valve plate channel hole (16), and the valve seat hole (15) correspond to each other, characterized in that, One side of the valve seat (3) is the front end face (4), and the other side of the valve seat (3) is the rear end face (5). The outer edge of the rear end face (5) is provided with a groove (6), and a floating seal (7) is provided in the groove (6). A fixed sandproof plate (8) is provided on the top of the valve seat (3) near the rear end face (5), and a floating sandproof plate (9) is provided on the top of the valve seat (3) near the front end face (4). A spring (10) is provided between the fixed sandproof plate (8) and the floating sandproof plate (9). The outer wall of the outer ring of the floating seal (7) is provided with a metal anti-extrusion retaining ring (11). The inner ring wall of the floating seal (7) is provided with a metal support ring (12). The metal support ring (12) is provided with multiple pressure grooves (13) arranged in a ring array. The floating seal (7) has a convex surface on its outer side, which is located between the metal anti-extrusion retaining ring (11) and the metal support ring (12).

2. A valve with sand-proof function according to claim 1, characterized in that, The valve seat (3) has an annular groove (17) on the outer ring of the front end face (4).

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