175MPa hydraulic drive sand prevention type large-diameter fracturing valve

Abstract

The utility model discloses a 175 MPa hydraulic drive sand prevention type large-diameter fracturing valve which comprises a valve body, a valve seat, a valve plate, a valve cover, a valve rod, a hydraulic cylinder connecting disc and a hydraulic cylinder assembly. The valve cover is divided into an upper valve cover body and a lower valve cover body. The upper valve cover and the lower valve cover are each provided with at least one sand discharging hole, and the axis of each sand discharging hole is parallel to the axis, coaxial with the first channel hole, of the second channel hole. The sand discharging holes are additionally formed in the upper valve cover and the lower valve cover respectively, so that sand cleaning and sand discharging are facilitated in the maintenance process.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of oil and gas drilling and fracturing valve, especially relates to a 175MPa liquid sand prevention type large -diameter fracturing valve. BACKGROUND

[0002] With the increasing demand of domestic oil and gas and the rapid development of social economy, the deep well drilling technology of oil and gas is more and more mature, the drilling depth is more and more deep, and the rated working pressure of drilling equipment is more and more high.

[0003] The sand prevention effect of the conventional flat valve is poor, and fine sand can easily enter the valve cavity of the flat valve body during oil wellhead operation, affecting the normal opening and closing operation of the flat valve, and even causing the site to stop working and unable to continue operation. Therefore, a 175MPa liquid sand prevention type large-diameter fracturing valve is needed, which can be used in a pressure environment of 140MPa or above for a long time, and the liquid fracturing valve is a key equipment for shale gas high-pressure large-diameter fracturing.

[0004] Most of the traditional fracturing valves are manually operated, and with the factors of high pressure and large diameter of fracturing, the manual operation torque is large, the operation efficiency is low, and there is a safety risk, so the remote control liquid fracturing valve is gradually favored by users, but the fracturing valve needs to be repaired after a certain period of use. When the fracturing valve is disassembled and the sealing element is replaced, the fracturing valve needs to be completely disassembled, especially the liquid cylinder part needs to be completely disassembled, which is time-consuming and labor-consuming, and the liquid replacement manual structure is complex.

[0005] The traditional sand prevention sealing device adopts a fracturing valve, and particles such as sand and mud are very easy to enter the inner cavity of the valve body of the fracturing valve during fracturing operation, causing a large amount of sediment, affecting the opening and closing and sealing performance of the fracturing valve, and there is a risk of failure, so the sand prevention fracturing valve with sand removal function is gradually favored by users.

[0006] Chinese invention patent application publication No. CN117685383A discloses a 175MPa high-pressure resistant flat valve that can be quickly opened and closed, and the top of the right valve seat and the left valve seat is fixed with a sand prevention plate, but the patent does not provide a sand removal opening and a sand removal and cleaning maintenance channel on the right valve seat and the left valve seat, which is not conducive to sand removal and cleaning during maintenance.

[0007] The Chinese utility model patent authorization announcement No. CN219639488U discloses a 175MPa superhigh pressure erosion-resistant sand prevention flat plate valve, which is provided with a wave spring on the outer circle end of the end face of each valve seat and valve body, and a sand prevention plate assembly is arranged outside the valve plate bottom in the valve body. However, the patent does not set a sand discharge opening and a sand discharge and cleaning maintenance channel on the valve seat, which is not conducive to sand discharge and cleaning during maintenance.

[0008] The Chinese invention patent application publication No. CN116557558A discloses a 175MPa sand prevention type flat plate valve, which can avoid the direct or indirect entry of pressure sand between the valve seat and the valve plate through the cooperation of the elastic valve seat sealing and the spacer ring, block the path of direct entry of pressure sand between the valve seat and the valve plate, block the path of indirect entry of pressure sand between the valve seat and the valve plate, avoid the phenomenon of valve jamming, and meet the working condition of conveying superhigh pressure fracturing fluid. However, the patent does not set a sand discharge opening and a sand discharge and cleaning maintenance channel on the valve seat, which is not conducive to sand discharge and cleaning during maintenance.

[0009] The Chinese invention patent application publication No. CN115750819A discloses a flat plate gate valve sealing structure sealing mechanism for 175MPa superhigh pressure, which is provided with a first sealing device on the first side of the valve body and a third sealing device on the third side. By setting the first sealing device and the third sealing device on the valve seat, the sealing effect of the gate valve is improved, the medium is prevented from entering the valve cavity, the flexibility of valve opening and closing is improved, and the sealing effect is improved. However, the patent does not set a sand discharge opening and a sand discharge and cleaning maintenance channel on the valve seat, which is not conducive to sand discharge and cleaning during maintenance. Utility model content

[0010] In order to overcome the above-mentioned shortcomings, the utility model aims at providing a 175MPa liquid-driven sand prevention type large-diameter fracturing valve, which is more stable and reliable in work than the early used fracturing valve, can effectively prevent mud and sand from entering the cavity, greatly improves the sealing performance of the valve, and reserves a sand discharge hole and a sand discharge and cleaning maintenance channel.

[0011] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme of:

[0012] The utility model provides a kind of 175MPa liquid sand control type large-diameter fracturing valve, including valve body, valve seat, valve plate, valve cover, valve stem, liquid cylinder connecting disc, liquid cylinder assembly, the first passage hole is provided in the valve body, the valve seat is installed in the first passage hole of the valve body and with the valve body sealed contact, the valve seat has a second passage hole and valve plate insertion cavity, the second passage hole is coaxial with the first passage hole and communicates, the valve plate insertion cavity is perpendicular to the axis of the second passage hole;The valve plate is inserted into the valve plate insertion cavity in the valve seat, and the valve plate is driven connection by the valve stem and liquid cylinder assembly;The valve cover is divided into upper valve cover and lower valve cover;The upper valve cover is installed on the upper portion of valve body, and the lower valve cover is installed on the lower portion of valve body;The liquid cylinder assembly is installed on the upper valve cover by liquid cylinder connecting disc, and the valve stem passes through the upper valve cover;Its characterized in that, at least one sand hole is provided on the upper valve cover and lower valve cover, and the axis of the sand hole is parallel to the axis of the second passage hole coaxial with the first passage hole.

[0013] In a preferred embodiment of the utility model, four sand holes are provided on the upper valve cover and lower valve cover, and the four sand holes are distributed on the upper valve cover and lower valve cover with a circumferential interval of 90°.

[0014] In a preferred embodiment of the utility model, the inner diameter of each sand hole is greater than 10 mm, which is beneficial to high-pressure flushing and facilitates the smooth discharge of sand particles, mud and the like from the valve cavity.

[0015] In a preferred embodiment of the utility model, a sand plug is installed at the outer end of each sand hole.

[0016] In a preferred embodiment of the utility model, the valve seat is a two-piece structure, divided into a left valve seat and a right valve seat, and the left valve seat and the right valve seat are both provided with the second passage hole, and the valve plate insertion cavity is located between the left valve seat and the right valve seat;The left valve seat and the right valve seat both have a first sealing surface in sealing contact with the valve body and a second sealing surface in sealing contact with the valve plate, and two sealing assemblies are provided on the first sealing surface to form a seal between the left valve seat, the right valve seat and the valve body.

[0017] In a preferred embodiment of the utility model, both of the two sealing assemblies are end face sealing assemblies.

[0018] In a preferred embodiment of the utility model, a sand baffle is provided on the left valve seat and the right valve seat;The sand baffle extends towards the upper valve cover.

[0019] In a preferred embodiment of the utility model, the sand baffle has a third sealing surface in sealing contact with the valve plate, and the third sealing surface is flush with the second sealing surface.

[0020] In one preferred embodiment of the utility model, grease injection valve is arranged at the outer end of each sand drainage hole, and grease is injected into each sand drainage hole through the grease injection valve to avoid that the external silt enters the valve body through the sand drainage hole.

[0021] The 175MPa hydraulic sand-proof large-diameter fracturing valve improves the existing hydraulic fracturing valve, sand-proof baffles are arranged on the outer diameters of the left valve seat and the right valve seat, when the valve plate moves upward to open the valve, the sand-proof baffles can effectively block the mud and the like of the flow channel of the valve plate, and effectively prevent the fracturing sand and the like from entering the inner cavity of the valve body.

[0022] Compared with the prior art, the 175MPa hydraulic sand-proof large-diameter fracturing valve has the following advantages:

[0023] The 175MPa hydraulic sand-proof large-diameter fracturing valve of the utility model adds sand-proof baffles to the valve seat to form a sand-proof structure in which the sand-proof baffles are tightly attached to the valve plate, thereby preventing sand particles from entering the cavity from the flow channel during the opening and closing of the valve. The sealing structure of the valve seat end face has an axial pre-tightening force, and the pre-tightening force prevents the silt from entering the cavity when the pressure is low during the fracturing process, thereby effectively solving the problem of silt entering the inner cavity of the valve body. In addition, four sand drainage holes are arranged in the upper valve cover and the lower valve cover, which is beneficial to sand removal during maintenance. In addition, a sand drainage hole is arranged at the outer end of each sand drainage hole, the sand drainage hole is filled with sealing grease through the grease injection valve, the deposition of the mud in the valve cavity is effectively reduced, and the service life of the valve is improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a sectional view of the 175MPa hydraulic sand-proof large-diameter fracturing valve of the utility model.

[0025] Figure 2 It is a structural schematic view of the left valve seat of the utility model.

[0026] Figure 3 It is a structural schematic view of the right valve seat of the utility model.

[0027] Figure 4 It is a structural schematic view of the upper valve cover of the utility model.

[0028] Figure 5 It is a structural schematic view of the lower valve cover of the utility model. DETAILED DESCRIPTION

[0029] The following will be combined Figures 1-3 to specifically describe one preferred embodiment of the utility model.

[0030] Reference Figure 1The utility model discloses a 175MPa hydraulic sand prevention type large-diameter fracturing valve, which comprises a valve body 1, a valve seat 2, a valve plate 3, a valve cover, a valve rod 5, a hydraulic cylinder connecting disc 6 and a hydraulic cylinder assembly 8.

[0031] The valve body 1 is provided with a passage hole 1a (the first flow channel hole), and the valve seat 2 is installed in the passage hole 1a of the valve body 1 and in sealing contact with the valve body 1.

[0032] The valve seat 2 is a two-half structure and comprises a left valve seat 2a and a right valve seat 2b, both of which are provided with passage holes 2aa and 2ba (the second flow channel hole), which are coaxial with the passage hole 1a and communicate with each other. A valve plate insertion cavity 2c is located between the left valve seat 2a and the right valve seat 2b and is perpendicular to the coaxial axis of the passage holes 2aa and 2ba, and the valve plate 3 is inserted into the valve plate insertion cavity 2c.

[0033] The valve cover comprises an upper valve cover 4a and a lower valve cover 4b, the upper valve cover 4a is installed on the upper part of the valve body 1 by means of fastening bolts 4aa and sealing elements 4ab, and the lower valve cover 4b is installed on the lower part of the valve body 1 by means of fastening bolts 4ba and sealing elements 4bb.

[0034] The hydraulic cylinder assembly 8 is installed on the upper valve cover 4a through the hydraulic cylinder connecting disc 6, and the valve plate 3 is drivenly connected with the hydraulic cylinder assembly 8 through the valve rod 5, the valve rod 5 penetrates through the upper valve cover 4a, thereby realizing the opening and closing of the 175MPa hydraulic sand prevention type large-diameter fracturing valve, and preventing fracturing sand in the fluid from entering the valve body 1, so that the sealing performance is ensured and the service life is greatly prolonged.

[0035] The utility model discloses a characteristic is: four sand discharge holes 4ac and 4bc are arranged on the upper valve cover 4a and the lower valve cover, the axes of the four sand discharge holes 4ac and 4bc are parallel to the coaxial axes of the passage holes 2aa and 2ba and the passage hole 1a. The four sand discharge holes 4ac and 4bc are distributed on the upper valve cover 4a and the lower valve cover 4b at a circumferential interval of 90°. The inner diameter of each sand discharge hole 4ac and 4bc is greater than 10mm, which is beneficial to high-pressure flushing and facilitates the smooth discharge of sand particles and mud from the valve cavity. A sand discharge plug 4ad and 4bd is installed at the outer end of each sand discharge hole 4ac and 4bc.

[0036] The left valve seat 2a and the right valve seat 2b are provided with sealing surfaces 2ab and 2bb (the first sealing surface) in sealing contact with the valve body 1 and sealing surfaces 2ac and 2bc (the second sealing surface) in hard sealing contact with the valve plate 3.

[0037] Two sealing assemblies 2ad, 2ae, 2bd, 2be are arranged on the sealing surface 2ac, 2bc, and the left valve seat 2a and the right valve seat 2b are sealed from the valve body 1 by the two sealing assemblies 2ad, 2ae, 2bd, 2be respectively.

[0038] The sand prevention baffle 9a, 9b is fixed on the outer diameter of the left valve seat 4a and the right valve seat 4b, and extends to the upper valve cover 4a.

[0039] The sand prevention baffle 9a, 9b has a sealing surface 9aa, 9ba (the third sealing surface) in hard sealing contact with the valve plate 3, and the sealing surface 9aa, 9ba is flush with the sealing surface 2ac, 2bc.

[0040] In addition, grease injection valves (not shown in the figure) are arranged at the outer ends of the four sand discharge holes 4ac, 4bc, and grease is injected into the four sand discharge holes 4ac, 4bc through the grease injection valves to prevent external sand from entering the valve body 1 through the four sand discharge holes 4ac, 4bc.

[0041] The 175MPa hydraulic sand prevention type large-diameter fracturing valve provided by the utility model improves the existing hydraulic fracturing valve, increases the sand prevention baffle 9a, 9b on the left valve seat 4a and the right valve seat 4b, effectively prevents fracturing sand from entering the inner cavity of the valve body 1, and additionally, four sand discharge holes 4ac, 4bc are arranged on the upper valve cover 4a and the lower valve cover, so that the fracturing valve can be maintained and maintained during the fracturing operation, such as sand cleaning, sand discharge and grease injection, thereby greatly prolonging the service life.

[0042] Compared with the prior art, the sand prevention sealing device has the advantages that the 175MPa hydraulic sand prevention type large-diameter fracturing valve increases the sand prevention baffle 9a, 9b on the left valve seat 4a and the right valve seat 4b, so that the sealing is more reliable, thereby effectively solving the problem of sand entering the inner cavity of the valve body 1.

[0043] Although the content of the utility model has been described in detail through the above preferred embodiments, it should be recognized that the above description should not be considered as a limitation of the utility model. After reading the above content, various modifications and substitutions of the utility model will be obvious to those skilled in the art. Therefore, the protection scope of the utility model should be limited by the attached claims.

Claims

1. A 175MPa hydraulic sand control large-diameter fracturing valve, comprising a valve body, a valve seat, a valve plate, a valve cover, a valve stem, a hydraulic cylinder connecting plate, and a hydraulic cylinder assembly, wherein a first channel hole is provided in the valve body, the valve seat is mounted in the first channel hole of the valve body and is in sealing contact with the valve body, a second channel hole and a valve plate insert cavity are provided in the valve seat, the second channel hole is coaxial with and communicates with the first channel hole, the valve plate insert cavity is perpendicular to the axis of the second channel hole; the valve plate is inserted into the valve plate insert cavity in the valve seat, and the valve plate is driven and connected to the hydraulic cylinder assembly through the valve stem; the valve cover is divided into an upper valve cover and a lower valve cover; the upper valve cover is mounted on the upper part of the valve body, and the lower valve cover is mounted on the lower part of the valve body; the hydraulic cylinder assembly is mounted on the upper valve cover through the hydraulic cylinder connecting plate, and the valve stem passes through the upper valve cover; it is characterized in that At least one sand discharge hole is provided on each of the upper valve cover and the lower valve cover, and the axis of the sand discharge hole is parallel to the axis of the second channel hole that is coaxial with the first channel hole.

2. A 175MPa hydraulic sand control large-diameter fracturing valve according to claim 1, characterized in that: Four sand discharge holes are provided on each of the upper valve cover and the lower valve cover. The four sand discharge holes are distributed on the upper valve cover and the lower valve cover at a circumferential interval of 90 degrees.

3. A 175MPa hydraulic sand control large-diameter fracturing valve according to claim 2, characterized in that: The inner diameter of each sand discharge hole is greater than 10mm, which is conducive to high-pressure flushing and facilitates the smooth discharge of sand and mud from the valve cavity.

4. A 175MPa hydraulic sand control large-diameter fracturing valve according to claim 3, characterized in that: A sand discharge plug is installed at the outer end of each sand discharge hole.

5. A 175MPa hydraulic sand control large-diameter fracturing valve according to any one of claims 1 to 4, characterized in that: The valve seat is a two-half structure, divided into a left valve seat and a right valve seat, and the left valve seat and the right valve seat are both provided with the second channel hole, and the valve plate insertion cavity is located between the left valve seat and the right valve seat; the left valve seat and the right valve seat both have a first sealing surface in sealing contact with the valve body and a second sealing surface in sealing contact with the valve plate, and two sealing assemblies are provided on the first sealing surface, and the left valve seat and the right valve seat are respectively sealed with the valve body through the two sealing assemblies.

6. A 175MPa hydraulic sand control large-diameter fracturing valve according to claim 5, characterized in that: Both sealing components are end face sealing components.

7. A 175MPa hydraulic sand control large-diameter fracturing valve according to claim 6, characterized in that: Sand-proof baffles are provided on both the left valve seat and the right valve seat; the sand-proof baffles extend toward the upper valve cover.

8. The 175MPa hydraulic sand control large-diameter fracturing valve according to claim 7, characterized in that: The sand control shield has a third sealing surface in sealing contact with the valve plate, and the third sealing surface is flush with the second sealing surface.

9. The 175MPa hydraulic sand control large-diameter fracturing valve according to claim 8, characterized in that: A grease injection valve is provided at the outer end of each sand discharge hole, and grease is injected into each sand discharge hole through the grease injection valve to seal it, so as to prevent external mud and sand from entering the valve body through the sand discharge hole.

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