Hydraulically-controlled switch sliding sleeve
By introducing a self-locking structure and power spring into the hydraulically controlled sliding sleeve switch, the problem of seal damage caused by long-term operation is solved, and the reliability and safety of sliding sleeve in deep well operation is achieved.
Patent Information
- Application Number
- CN202420869303.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-25
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-04-25
AI Technical Summary
The existing hydraulically controlled sliding sleeve switches are likely to cause lax sealing during long-term production operations, resulting in problems such as the sliding sleeve being unable to open or close.
A hydraulically controlled switch slip sleeve is designed, adopting a self-locking structure and a power spring, which enables the opening and closing of the slip sleeve through the pressurization of the hydraulic pipeline, reducing the dependence on downhole pressure.
It is achieved that the sliding sleeve can be penetrated into a deeper wellhead without considering the downhole pressure, meets the demand for deep well operation, and extends the service life of the sliding sleeve, improves operation safety and reduces costs.
Smart Images
Figure CN222633212U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of switch sliding sleeves, in particular to a hydraulically controlled switch sliding sleeve. Background Art
[0002] Sliding sleeve is one of the commonly used downhole tools on the production string of oil and gas wells. Its function is to provide a controllable switch between the production channel and the annulus of the casing and oil casing on the downhole production string. Its switch types include: mechanical switch type and hydraulic switch type. The mechanical switch type requires a wireline tool to be lowered to open or close, and requires a larger ground operation equipment.
[0003] Hydraulic switches are relatively simple to control from the ground, and only require a manual hydraulic pump to achieve switching, so they are widely used in offshore oil fields where space is relatively tight. However, the current hydraulically controlled sliding sleeve switch requires the hydraulic pipeline to be pressurized to ensure that the sliding sleeve is in the open state. For well conditions that require long-term production operations, it is bound to affect the service life of the piston seal, and ultimately cause loose sealing, resulting in the sliding sleeve switch being unable to open or close.
[0004] Therefore, in order to solve the above problems, a hydraulically controlled switch sleeve is proposed. Utility Model Content
[0005] The utility model aims to provide a hydraulically controlled switch sleeve, comprising an upper joint, wherein the lower interior of the upper joint is threadedly connected to the upper external surface of a housing connecting sleeve, the lower interior of the housing connecting sleeve is threadedly connected to the upper external surface of a housing sealing sleeve, the lower interior of the housing sealing sleeve is threadedly connected to the upper external surface of a spring sleeve, the lower interior of the spring sleeve is threadedly connected to a lower joint, and a center hole opened at an inner center position after the upper joint, the housing connecting sleeve and the housing sealing sleeve are connected is threadedly connected to a center tube 1, and the lower part of the center tube 1 is threadedly connected to a center tube 2, a dynamic sealing piston rod assembly is arranged inside the upper joint, and the dynamic sealing piston rod assembly consists of a piston rod, a straightening ring, a piston nut and a piston sealing ring, a straightening ring is arranged on the outer sleeve of the piston rod, a piston nut is arranged below the straightening ring, a piston sealing ring is arranged above the straightening ring, and a self-locking The invention relates to a self-locking structure, wherein the self-locking structure is composed of a guide rail sleeve, a sliding grip sleeve, an ejector pin, a sliding sealing ring 1 and a sliding sealing ring 2, wherein the ejector pin is arranged above the outside of the center tube 1, and a guide rail sleeve is arranged between the ejector pin and the inner wall of the shell connecting sleeve, the sliding grip sleeve is arranged outside the center tube 1, and the sliding grip sleeve is located below the ejector pin, and a groove for connecting the piston connecting sleeve is provided on the lower end surface of the sliding grip sleeve, and two groups of main sliding sealing assemblies are arranged between the piston connecting sleeve and the shell sealing sleeve, the main sliding sealing assembly is composed of a piston, a retaining ring, a main piston sealing ring 1 and a main piston sealing ring 2, the piston is connected to the retaining ring, a flow sleeve is arranged between the main sliding sealing assembly and the shell sealing sleeve, the main sliding sealing assembly is connected to the spring upper seat at the bottom, the center tube 2 is threadedly connected to the spring lower seat at the bottom, a power spring is sleeved on the outer surface of the center tube 2, the power spring is connected to the spring upper seat at the top, and the power spring is connected to the spring lower seat at the bottom.
[0006] Compared with the prior art, the utility model has the following beneficial effects: the utility model does not need to consider the downhole pressure and can be lowered into a deeper wellhead to meet the needs of deep well operations. Compared with the sliding sleeve that needs to maintain pressure inside the pipeline all the time to make the sliding sleeve in a fully open state, a self-locking structure is added, and the track change can be achieved by pressurizing the inside of the pipeline once, thereby achieving the open or closed state by pressurizing the inside of the pipeline once, solving the problem of damage to the seal caused by long-term operation and increasing the service life of the sliding sleeve.
[0007] The utility model is provided with metal seals at the connection between the upper joint and the shell connecting sleeve, at the connection between the shell connecting sleeve and the shell sealing sleeve, at the connection between the shell sealing sleeve and the spring sleeve, and at the connection between the spring sleeve and the lower joint. It has good corrosion resistance even in extremely harsh well conditions, greatly improves operation safety, reduces operation costs, and reduces the risk of sleeve failure. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Figure 1 It is a schematic diagram of the structure of the utility model;
[0009] Figure 2 This is an enlarged structural diagram of the A part of the utility model
[0010] The reference numerals and names in the figures are as follows:
[0011] 1. Upper joint; 2. Shell connecting sleeve; 3. Shell sealing sleeve; 4. Spring sleeve; 5. Lower joint; 6. Center tube one; 7. Center tube two; 8. Piston connecting sleeve; 9. Current sleeve; 10. Retaining ring; 11. Piston; 12. Spring upper seat; 13. Spring lower seat; 14. Power spring; 15. Guide sleeve; 16. Sliding grip sleeve; 17. Ejector pin; 18. Piston rod; 19. Righting ring; 20. Piston nut; 21. Piston sealing ring; 22. Sliding sealing ring one; 23. Sliding sealing ring two; 24. Sliding sealing ring three; 25. Main piston sealing ring one; 26. Main piston sealing ring two. DETAILED DESCRIPTION
[0012] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0013] As attached Figure 1 , 2As shown, the utility model provides a hydraulically controlled switch sleeve, including an upper joint 1, wherein the lower interior of the upper joint 1 is threadedly connected to the upper exterior of a housing connection sleeve 2, the lower interior of the housing connection sleeve 2 is threadedly connected to the upper exterior of a housing sealing sleeve 3, the lower interior of the housing sealing sleeve 3 is threadedly connected to the upper exterior of a spring sleeve 4, the lower interior of the spring sleeve 4 is threadedly connected to a lower joint 5, and a center hole opened at the inner center position after the upper joint 1, the housing connection sleeve 2 and the housing sealing sleeve 3 are connected is threadedly connected to a center pipe 6, and the center pipe 6 The lower part is threadedly connected with the center tube 7, and a dynamic sealing piston rod assembly is arranged inside the upper joint 1, and the dynamic sealing piston rod assembly is composed of a piston rod 18, a straightening ring 19, a piston nut 20, and a piston sealing ring 21. The outer sleeve of the piston rod 18 is provided with a straightening ring 19, and a piston nut 20 is arranged below the straightening ring 19. A piston sealing ring 21 is arranged above the straightening ring 19. A self-locking structure is arranged between the inner side wall of the shell connecting sleeve 2 and the outer wall of the center tube 6, and the self-locking structure is composed of a guide sleeve 15, a sliding grip sleeve 16, and an ejector pin 1 7. The sliding seal ring 1 22 and the sliding seal ring 2 23 are composed of the ejector pin 17 arranged above the outside of the central tube 1 6, and the guide sleeve 15 is arranged between the ejector pin 17 and the inner wall of the housing connecting sleeve 2, the sliding grip sleeve 16 is sleeved on the outside of the central tube 1 6, and the sliding grip sleeve 16 is located below the ejector pin 17, and the lower end surface of the sliding grip sleeve 16 is provided with a groove connected to the piston connecting sleeve 8, and two sets of main sliding seal components are arranged between the piston connecting sleeve 8 and the housing sealing sleeve 3, and the main sliding seal components are composed of a piston 11, a retaining ring 10, and a main piston sealing ring 24 , the main piston sealing ring 25, the piston 11 is connected with the retaining ring 10, a flow sleeve 9 is arranged between the main sliding sealing assembly and the housing sealing sleeve 3, the lower part of the main sliding sealing assembly is connected with the spring upper seat 12, the lower part of the center tube 27 is threadedly connected with the spring lower seat 13, the outer surface of the center tube 27 is sleeved with a power spring 14, the upper part of the power spring 14 is connected with the spring upper seat 12, the lower part of the power spring 14 is connected with the spring lower seat 13, and a rapid rebound force is achieved by the power spring 14 when a production channel needs to be closed.
[0014] Specifically, metal seals are provided at the connection between the upper joint 1 and the shell connecting sleeve 2, the connection between the shell connecting sleeve 2 and the shell sealing sleeve 3, the connection between the shell sealing sleeve 3 and the spring sleeve 4, and the connection between the spring sleeve 4 and the lower joint 5, which have better corrosion resistance than ordinary soft seals.
[0015] Specifically, the central tube 7 and the spring lower seat 13 are both arranged in a central hole opened inside the spring sleeve 4 .
[0016] Specifically, the outer walls of the shell sealing sleeve 3, the center tube 1 6 and the center tube 2 7 are each provided with 6 flow holes.
[0017] Specifically, the straightening ring 19 , the piston nut 20 , and the piston sealing ring 21 are respectively arranged between the piston rod 18 and the inner hole wall of the upper joint 1 .
[0018] Specifically, the raised groove provided below the piston rod 18 is matched and connected with the raised groove below the ejector pin 17 .
[0019] Specifically, a main piston sealing ring 1 24 is provided between the retaining ring 10 and the housing sealing sleeve 3 , and a main piston sealing ring 2 25 is provided between the retaining ring 10 and the center tube 1 6 .
[0020] Specifically, the threads of the upper joint 1, the housing connecting sleeve 2, the housing sealing sleeve 3, the spring sleeve 4 and the lower joint 5 are all processed by carbonitriding process.
[0021] Specifically, the piston rod 18 is treated with sprayed tungsten carbide and is made of INCONEL 718 nickel-based alloy to improve the reliability of the sliding sleeve in multiple switching operations and prevent leakage.
[0022] Working principle:
[0023] Step 1: Connect the switch sleeve and the oil pipe to each other;
[0024] Step 2: After the switch sleeve is lowered into the designed position of the oil and gas well through the oil pipe, the piston sealing chamber is pressurized through the hydraulic control pipeline. At this time, under the action of the hydraulic pressure, the piston rod 18 moves downward to drive the ejector pin 17 and the sliding grip sleeve 16 to move. When the sliding grip sleeve 16 moves to the designated position, it will stop moving downward;
[0025] Step 3: At this time, the hydraulic control line pressure is released, and under the action of the power spring 14, the hydraulic control line enters the predetermined short track through the inclined surface set at the upper end of the sliding grip sleeve 16 and the inclined surface at the lower end of the guide sleeve 15. At this time, the six holes of the housing sealing sleeve 3, the flow sleeve 9 and the center pipe 6 of the sliding sleeve switch are connected, and the production channel is opened;
[0026] Step 4: Now you can start production operations;
[0027] Step 5: If the sliding sleeve needs to be closed after the construction work is completed, the hydraulic control pipeline is re-pressurized. At this time, the piston rod 18 drives the ejector pin 17 and the sliding grip sleeve 16 downward again, and enters the track through the inclined surface set at the upper end of the sliding grip sleeve 16 and the inclined surface at the lower end of the guide sleeve 15. However, the long track is entered at this time, thereby realizing the second track change. After the track change is completed, the pressure of the hydraulic control pipeline is released. At this time, under the action of the rebound force of the power spring 14, the holes of the center tube 6 and the holes of the flow sleeve 9 and the shell sealing sleeve 3 are in a dislocated state, and the production is closed;
[0028] Step 6: Repeat steps 2 to 5 when you need to work again.
[0029] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.
[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
Claims
1. A hydraulically controlled switch sleeve, comprising an upper joint (1), wherein the lower interior of the upper joint (1) is threadedly connected to the upper exterior of a housing connection sleeve (2), the lower interior of the housing connection sleeve (2) is threadedly connected to the upper exterior of a housing sealing sleeve (3), the lower interior of the housing sealing sleeve (3) is threadedly connected to the upper exterior of a spring sleeve (4), and the lower interior of the spring sleeve (4) is threadedly connected to a lower joint (5), characterized in that: After the upper joint (1), the housing connection sleeve (2) and the housing sealing sleeve (3) are connected, a center hole opened at the inner center position is threadedly connected to a center pipe 1 (6), and the lower part of the center pipe 1 (6) is threadedly connected to a center pipe 2 (7). A dynamic sealing piston rod assembly is arranged inside the upper joint (1), and the dynamic sealing piston rod assembly is composed of a piston rod (18), a straightening ring (19), a piston nut (20) and a piston sealing ring (21). The outer sleeve of the piston rod (18) is provided with a straightening ring (19). A piston nut (20) is arranged below the straightening ring (19), a piston sealing ring (21) is arranged above the straightening ring (19), a self-locking structure is arranged between the inner side wall of the shell connecting sleeve (2) and the outer wall of the center tube (6), the self-locking structure is composed of a guide sleeve (15), a sliding grip sleeve (16), an ejector pin (17), a sliding sealing ring (22) and a sliding sealing ring (23), the ejector pin (17) is arranged above the outside of the center tube (6), and the ejector pin (17) is connected to the shell A guide sleeve (15) is arranged between the inner walls of the connecting sleeve (2), the sliding grip sleeve (16) is sleeved on the outside of the central tube (6), and the sliding grip sleeve (16) is located below the ejector pin (17), and a groove for connecting the piston connecting sleeve (8) is provided on the lower end surface of the sliding grip sleeve (16), and two sets of main sliding sealing components are arranged between the piston connecting sleeve (8) and the housing sealing sleeve (3), and the main sliding sealing components are composed of a piston (11), a retaining ring (10), a main piston sealing ring (24), and a main piston sealing ring (2 5), the piston (11) is connected to the retaining ring (10), a flow sleeve (9) is arranged between the main sliding seal assembly and the housing sealing sleeve (3), the lower part of the main sliding seal assembly is connected to the spring upper seat (12), the lower part of the center tube 2 (7) is threadedly connected to the spring lower seat (13), the outer surface of the center tube 2 (7) is sleeved with a power spring (14), the upper part of the power spring (14) is connected to the spring upper seat (12), and the lower part of the power spring (14) is connected to the spring lower seat (13).
2. A hydraulically controlled switch sleeve according to claim 1, characterized in that: Metal seals are provided at the connection between the upper joint (1) and the shell connecting sleeve (2), the connection between the shell connecting sleeve (2) and the shell sealing sleeve (3), the connection between the shell sealing sleeve (3) and the spring sleeve (4), and the connection between the spring sleeve (4) and the lower joint (5).
3. A hydraulically controlled switch sleeve according to claim 1, characterized in that: The central tube 2 (7) and the spring lower seat (13) are both arranged in a central hole opened inside the spring sleeve (4).
4. The hydraulically controlled switch sleeve according to claim 1, characterized in that: The outer walls of the housing sealing sleeve (3), the center tube one (6) and the center tube two (7) are all provided with six flow holes.
5. The hydraulically controlled switch sleeve according to claim 1, characterized in that: The straightening ring (19), the piston nut (20) and the piston sealing ring (21) are respectively arranged between the piston rod (18) and the inner hole wall of the upper joint (1).
6. The hydraulically controlled switch sleeve according to claim 1, characterized in that: The raised groove arranged below the piston rod (18) is matched and connected with the raised groove below the ejector pin (17).
7. The hydraulically controlled switch sleeve according to claim 1, characterized in that: A main piston sealing ring 1 (24) is arranged between the retaining ring (10) and the housing sealing sleeve (3), and a main piston sealing ring 2 (25) is arranged between the retaining ring (10) and the center pipe 1 (6).