Oil-water well backwashing valve

By designing the component structure of the oil-water well backwash valve, the difference in area of ​​the wipe ring and the difference in spring strength can achieve frequent opening and closing and sealing of the valve, which solves the problem of short service life of the backwash valve and improves equipment stability and production efficiency.

CN223256799UActive Publication Date: 2025-08-22HAINAN SHANGSHAN PETROLEUM CO LTD
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Patent Information

Application Number
CN202422863898.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-11-22
Publication Date
2025-08-22
Estimated Expiration
2034-11-22

AI Technical Summary

Technical Problem

The service life of existing oil-water well backwash valves is short, resulting in the valve being no longer sealed after frequent well washing, increasing production management costs.

Method used

An oil-water well backwashing valve is designed, including components such as upper joint, spring outer cylinder, eraser ring, valve core, sealing sleeve, sheath and lower joint. The sliding of the valve core is achieved through the area difference of the eraser ring, and the circulation hole is opened and closed by using the washing pressure, combining the different strengths and lengths of the upper and lower springs to ensure the frequent opening and closing of the valve and sealing effect.

Benefits of technology

It extends the service life of the backwash valve, keeps the wellbore clean, reduces maintenance costs and improves production efficiency.

✦ Generated by Eureka AI based on patent content.

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    Figure CN223256799U_ABST
Patent Text Reader

Abstract

The utility model provides a backwashing valve for an oil-water well. The backwashing valve comprises an upper joint (1), a spring outer cylinder (2), an upper spring (3), a wiping ring (4), a valve core (5), a sealing sleeve, a sheath (6), a lower joint (7) and a lower spring (8), the spring outer barrel (2) is sleeved with the upper connector (1) and positioned below the upper connector (1), a circulating hole (20) communicated with an oil-water well is formed in the side wall of the spring outer barrel (2), and a spring outer barrel inner circle step (22) is arranged on the upper portion of the inner circle of the spring outer barrel (2); the lower connector (7) is connected to the lower portion of the spring outer barrel (2) in a sleeved mode, the circulating hole (20) is located in the sliding space, and a lower connector inner circle step (72) is arranged at the bottom of the inner circle of the lower connector (7); and the valve element (5) is arranged in the sliding space in a sliding mode, and the stroke of the valve element (5) passes through the circulation hole (20). The device can be repeatedly and frequently started and closed, and is long in service life, stable in performance and long-term effective.
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Description

Technical Field

[0001] The utility model relates to the field of oil and water well flushing operations in oil fields, in particular to an oil and water well backwashing valve. Background Art

[0002] Currently, when washing oil and water wells, the backwash valve often has a short service life and the backwash valve no longer seals after frequent well washing, which leads to high production management costs.

[0003] In summary, the prior art has at least the following problems: the backwash well valve has a short service life. Utility Model Content

[0004] The utility model provides an oil-water well backwash valve to solve the problem of short service life of the backwash well valve.

[0005] To this end, the utility model proposes an oil and water well backwash valve, which includes: an upper joint 1, a spring outer tube 2, an upper spring 3, a wiping ring 4, a valve core 5, a sealing sleeve, a sheath 6, a lower joint 7 and a lower spring 8;

[0006] The spring outer tube 2 is threadedly connected to the interior of the upper joint 1 and is positioned below the upper joint 1. A circulation hole 20 connected to the oil and water well is provided on the side wall of the spring outer tube 2. A spring outer tube inner circle step 22 is provided on the upper part of the inner circle of the spring outer tube 2.

[0007] The lower joint 7 is a stepped cylindrical structure and is sleeved below the spring outer tube 2 through a threaded connection. The inner cavity of the lower joint 7 is connected to the inner cavity of the spring outer tube 2 to form a sliding space for the valve core 5 to slide up and down. The circulation hole 20 is located within the sliding space. The inner bottom of the lower joint 7 is provided with a lower joint inner circle step 72;

[0008] The valve core 5 is slidably disposed in the sliding space, and the travel of the valve core 5 passes through the circulation hole 20;

[0009] A sealing sleeve is provided on the outer wall of the valve core 5;

[0010] The sheath 6 is cylindrical and is sleeved inside the lower joint 7 and is located below the valve core 5. The sheath 6 is pressed tightly between the inner circular step 72 of the lower joint and the valve core 5 through the lower spring 8.

[0011] The rubbing ring 4 is annular and is sleeved inside the spring outer tube 2 and located above the valve core 5. The rubbing ring 4 is pressed tightly between the inner circular step 22 of the spring outer tube and the valve core 5 through the upper spring 3;

[0012] The top area of ​​the wiping ring 4 is larger than the bottom area of ​​the sheath 6 .

[0013] Furthermore, an upper sealing groove 51 is provided on the upper portion of the valve core 5, and a lower sealing groove 53 is provided on the lower portion of the valve core 5.

[0014] The sealing sleeve includes: an upper sealing sleeve located in the upper sealing groove 51 and a lower sealing sleeve located in the lower sealing groove 53. The upper sealing sleeve is sealed between the valve core 5 and the spring outer tube 2; the lower sealing sleeve is sealed between the valve core 5 and the lower joint 7.

[0015] Furthermore, the wiping ring 4 is a stepped circular ring structure, with a large circular ring at the top and a small circular ring at the bottom.

[0016] Furthermore, the upper joint 1 is a first cylindrical structure, the upper and lower parts of the inner circle of the upper joint 1 are provided with internal threads, and the end of the lower internal thread is provided with a sealing surface.

[0017] Furthermore, the circulation hole 20 is provided on the spring outer tube 2 along the circumferential direction.

[0018] Furthermore, the valve core 5 is a second cylindrical body with a raised shoulder on the outer circle, the outer circle minor diameter of the valve core 5 is at the lower end, and the outer circle major diameter of the valve core 5 is at the upper part.

[0019] Furthermore, the upper spring 3 and the lower spring 8 have the same stiffness coefficient, and the length of the upper spring 3 is greater than the length of the lower spring 8 .

[0020] When the utility model is used, for example, when the annulus is pressurized for well washing, the top area of ​​the wipe ring 4 is larger than the bottom area of ​​the sleeve 6. Due to the area difference, the well washing pressure pushes the valve core 5 upward and opens the circulation hole of the spring outer tube 2. After the well washing is completed, the large spring, that is, the upper spring 3, pushes the valve core 5 downward and closes the circulation hole of the spring outer tube 2. The small spring, that is, the lower spring 8 is used to push the sleeve to reset. The oil and water well backwash valve of the utility model can be repeatedly started and closed frequently, has a long service life, stable performance, and is effective for a long time. The application of the oil and water well backwash valve of the utility model can keep the wellbore clean, maintain normal production for a long time, reduce the maintenance cost of oil and water wells, and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the internal structure of the oil-water well backwash valve of the utility model.

[0022] Description of Figure Numbers:

[0023] 1. Upper connector; 2. Spring outer tube; 3. Upper spring; 4. Wiping ring; 5. Valve core; 6. Sheath; 7. Lower connector; 8. Lower spring;

[0024] 20. Circulation hole; 22. Inner circular step of spring outer cylinder; 51. Upper sealing groove; 53. Lower sealing groove; 72. Inner circular step of lower joint. DETAILED DESCRIPTION

[0025] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the present invention is now described.

[0026] like Figure 1 As shown, the utility model proposes an oil-water well backwash valve, which includes: an upper joint 1, a spring outer tube 2, an upper spring 3, a wiping ring 4, a valve core 5, a sealing sleeve, a sheath 6, a lower joint 7 and a lower spring 8;

[0027] The spring outer tube 2 is threadedly connected to the interior of the upper joint 1 and is positioned below the upper joint 1. A circulation hole 20 connected to the oil and water well is provided on the side wall of the spring outer tube 2. A spring outer tube inner circle step 22 is provided on the upper part of the inner circle of the spring outer tube 2.

[0028] The lower joint 7 is a stepped cylindrical structure and is sleeved below the spring outer tube 2 through a threaded connection. The inner cavity of the lower joint 7 is connected to the inner cavity of the spring outer tube 2 to form a sliding space for the valve core 5 to slide up and down. The circulation hole 20 is located within the sliding space. The inner bottom of the lower joint 7 is provided with a lower joint inner circle step 72;

[0029] The valve core 5 is slidably disposed in the sliding space, and the travel of the valve core 5 passes through the circulation hole 20;

[0030] A sealing sleeve is provided on the outer wall of the valve core 5;

[0031] The sheath 6 is cylindrical and is sleeved inside the lower joint 7 and is located below the valve core 5. The sheath 6 is pressed tightly between the inner circular step 72 of the lower joint and the valve core 5 through the lower spring 8.

[0032] The rubbing ring 4 is sleeved inside the spring outer tube 2 and is located above the valve core 5. The rubbing ring 4 is pressed tightly between the inner circular step 22 of the spring outer tube and the valve core 5 through the upper spring 3;

[0033] The top area of ​​the wiping ring 4 is larger than the bottom area of ​​the sheath 6. Through the area difference, the well washing pressure pushes the valve core 5 upward and opens the circulation hole of the spring outer tube 2, thereby achieving well washing.

[0034] Furthermore, an upper sealing groove 51 is provided on the upper portion of the valve core 5, and a lower sealing groove 53 is provided on the lower portion of the valve core 5. The sealing sleeve comprises an upper sealing sleeve located in the upper sealing groove 51 and a lower sealing sleeve located in the lower sealing groove 53. The upper sealing sleeve is sealingly connected between the valve core 5 and the spring outer tube 2; the lower sealing sleeve is sealingly connected between the valve core 5 and the lower joint 7. The upper sealing sleeve and the lower sealing sleeve respectively seal the valve core 5 and the spring outer tube 2, and the valve core 5 and the lower joint 7, thereby ensuring a good well flushing effect.

[0035] Furthermore, the wiping ring 4 is a stepped ring structure, with a large ring at the top and a small ring at the bottom. The inner diameter of the large ring at the top can be equal to the inner diameter of the sheath 6, thereby ensuring that the top area of ​​the wiping ring 4 is larger than the bottom area of ​​the sheath 6. The wiping ring 4 is a ring structure with a raised shoulder on the outer circle, a small diameter at the lower end, and a regular inner diameter.

[0036] Furthermore, the upper joint 1 is a cylindrical structure, with internal threads on the upper and lower parts of the inner circle of the upper joint 1, and a sealing surface on the end of the lower internal thread. The upper part of the upper joint 1 can be connected to the oil pipe, and the lower part is connected to the spring outer tube 2.

[0037] The spring outer tube 2 is a cylindrical structure, with raised shoulders on both the outer and inner circles. The small raised shoulder on the outer circle is at the upper end and has an external thread, and a sealing surface is provided at the lower part of the thread. The large diameter of the inner circle is at the lower part and has an internal thread, and a sealing surface is provided at the lower part of the thread. There is a circular array of radial holes in the middle part, namely, circulation holes.

[0038] The sheath 6 is a cylindrical body with a smooth outer circle. The lower joint 7 is a cylindrical structure with raised shoulders on both the inner and outer circles. The inner diameter is at the lower end, the outer diameter is at the upper end, the upper end of the outer diameter is threaded, and there is a sealing groove below the thread.

[0039] Furthermore, the circulation hole 20 is a through hole, which is circumferentially arranged on the spring outer tube 2. For example, multiple, for example, four, circulation holes can be arranged in the circumferential direction of the spring outer tube 2. They can be evenly arranged to enable the smooth entry and circulation of well washing fluid in four directions.

[0040] Furthermore, the valve core 5 is a second cylindrical body with a raised shoulder on the outer circle. The outer circle minor diameter of the valve core 5 is at the lower end, and the outer circle major diameter of the valve core 5 is at the upper part, so as to match the area difference required for well washing.

[0041] Furthermore, the upper spring 3 and the lower spring 8 have the same stiffness coefficient, and the length of the upper spring 3 is greater than that of the lower spring 8. In this way, the valve core 5 is easier to close the circulation hole 20, or in other words, when the well is not flushed, the circulation hole 20 is in a stable closed state, and the lower spring 8 is used for resetting.

[0042] The utility model can be used for backwashing of oil and water wells.

[0043] Parameters of this utility model:

[0044] 1. Total length of oil and water well backwash valve: 0.86m

[0045] 2. External diameter: 95mm

[0046] 3. Inner diameter: 60mm

[0047] 4. Connector type: 2 7 / 8NU male x 2 3 / 8NU female

[0048] 5. Circulation hole diameter: 60mm (4 pcs)

[0049] 6. Tensile strength: 600KN

[0050] Directions:

[0051] 1. Use the oil pipe (connected to the upper joint) to lower the reverse circulation valve to the predetermined depth in the well (connected above the packer)

[0052] 2. After the packer is set, backwash the well from the annulus with pressure increased, and the starting pressure is 0.9 MPa.

[0053] During well washing with annular pressure, the top area of ​​the wiping ring 4 is larger than the bottom area of ​​the sleeve 6. Due to the area difference, the well washing pressure pushes the valve core 5 upward and opens the circulation hole of the spring outer tube 2. After the well washing is completed, the large spring, i.e., the upper spring 3, pushes the valve core 5 downward and closes the circulation hole of the spring outer tube 2. The small spring, i.e., the lower spring 8, is used to push the sleeve back to its original position. The oil and water well backwash valve of the utility model can be repeatedly started and closed frequently, has a long service life, stable performance, and is effective for a long time. The application of the oil and water well backwash valve of the utility model can keep the wellbore clean, maintain normal production for a long time, reduce the maintenance cost of oil and water wells, and improve production efficiency.

[0054] The above description is merely an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. The various components of the present invention may be combined with each other without conflict, and any equivalent changes and modifications made by a person skilled in the art without departing from the concept and principles of the present invention shall fall within the scope of protection of the present invention.

Claims

1. An oil and water well backwash valve, characterized in that: The oil-water well backwash valve comprises: an upper joint (1), a spring outer tube (2), an upper spring (3), a rubbing ring (4), a valve core (5), a sealing sleeve, a sheath (6), a lower joint (7) and a lower spring (8); The spring outer cylinder (2) is sleeved inside the upper joint (1) through a threaded connection and is positioned below the upper joint (1). A circulation hole (20) communicating with the oil and water well is provided on the side wall of the spring outer cylinder (2). A spring outer cylinder inner circle step (22) is provided on the upper inner circle of the spring outer cylinder (2). The lower joint (7) is a stepped cylindrical structure and is sleeved below the spring outer tube (2) through a threaded connection. The inner cavity of the lower joint (7) is connected to the inner cavity of the spring outer tube (2) to form a sliding space for the valve core (5) to slide up and down. The circulation hole (20) is located in the sliding space. The inner circle bottom of the lower joint (7) is provided with a lower joint inner circle step (72); A valve core (5) is slidably disposed in the sliding space, and the travel of the valve core (5) passes through the circulation hole (20); A sealing sleeve is arranged on the outer wall of the valve core (5); The sheath (6) is cylindrical and is sleeved inside the lower joint (7) and located below the valve core (5). The sheath (6) is pressed tightly between the inner circular step (72) of the lower joint and the valve core (5) through the lower spring (8). The rubbing ring (4) is annular and is sleeved inside the spring outer tube (2) and located above the valve core (5). The rubbing ring (4) is pressed tightly between the inner circular step (22) of the spring outer tube and the valve core (5) through the upper spring (3); The top area of ​​the rubbing ring (4) is larger than the bottom area of ​​the sheath (6).

2. The oil-water well backwash valve according to claim 1, characterized in that: The upper portion of the valve core (5) is provided with an upper sealing groove (51), and the lower portion of the valve core (5) is provided with a lower sealing groove (53). The sealing sleeve comprises: an upper sealing sleeve located in the upper sealing groove (51) and a lower sealing sleeve located in the lower sealing groove (53); the upper sealing sleeve is sealingly connected between the valve core (5) and the spring outer tube (2); and the lower sealing sleeve is sealingly connected between the valve core (5) and the lower joint (7).

3. The oil-water well backwash valve according to claim 1, characterized in that: The rubbing ring (4) is a stepped circular ring structure, with a large circular ring at the top and a small circular ring at the bottom.

4. The oil-water well backwash valve according to claim 1, characterized in that: The upper joint (1) is a first cylindrical structure. The upper and lower parts of the inner circle of the upper joint (1) are provided with internal threads, and the end of the lower internal thread is provided with a sealing surface.

5. The oil-water well backwash valve according to claim 1, characterized in that: The circulation hole (20) is arranged on the spring outer cylinder (2) along the circumferential direction.

6. The oil-water well backwash valve according to claim 1, characterized in that: The valve core (5) is a second cylindrical body with a raised shoulder on the outer circle. The outer circle minor diameter of the valve core (5) is at the lower end, and the outer circle major diameter of the valve core (5) is at the upper part.

7. The oil-water well backwash valve according to claim 1, characterized in that: The stiffness coefficients of the upper spring (3) and the lower spring (8) are the same, and the length of the upper spring (3) is greater than that of the lower spring (8).