An infinite level water plugging switch sliding sleeve

Abstract

The application discloses an infinite-level water plugging and opening switch sliding sleeve, which comprises a sliding sleeve and a switch tool, the sliding sleeve comprises an upper joint, a positioning claw, an upper connecting piece, a working barrel, an outer pipe, a lower connecting piece, a blocking ring, a lower joint, an upper sealing assembly and a lower sealing piece; and the switch tool comprises an upper connecting head, an upper cone, a central pipe, an upper slip, an upper sheath, a pin, a centralizing sleeve, a lower slip, a lower sheath, a lower cone, a load positioning sleeve, a guide head and a spring centralizing piece; the opening and closing of a target layer are realized through the cooperation of the sliding sleeve and the switch tool, multi-layer arbitrary number of layers and arbitrary layer combination exploitation are realized, the reliability of the technology is further improved, the service life of key tools and pipe columns is prolonged, the operation amount is reduced, the operation cost is reduced, the production capacity of each layer can be accurately understood, and the oilfield production time efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of oilfield production engineering and relates to an infinite-level water-blocking switch sliding sleeve. Background Technology

[0002] Because most blocks in complex fault-block oilfields have small-scale single-layer formations and lack the conditions for independent layer development, they mainly rely on the combined production of multiple layers, leading to low recovery rates and rapid increases in water cut, which seriously affects oilfield development efficiency. In order to alleviate inter-layer conflicts, implement "oil stabilization and water control," improve recovery rates, and understand the production capacity and water cut of each layer, layered management has gradually gained importance in various oilfields. Layered oil production technology has become increasingly mature and is being used more and more in production practice.

[0003] Domestic oilfields mainly use mechanical (hydraulic) switches or pressure-controlled switches for layered water finding and layer switching production processes. The process uses differential pressure forced spring mechanism to switch direction or pressure signal code to control motor operation, thereby controlling the production and shutdown of each layer. This technology can complete the well in one go and control multiple layers for water finding, water finding, and layer switching production without moving the tubing string, which can effectively reduce the workload and lower operating costs. However, it has problems such as a small number of layers, poor layer switching reliability, and short tubing string life. Summary of the Invention

[0004] The technical problem to be solved by this invention is to provide an infinite-level water-blocking switch sliding sleeve that meets the requirements of multi-layer high water-cut oil production technology, enables production with any number of layers, reduces workload, lowers operating costs, improves oil well production efficiency, and achieves the goal of cost reduction and efficiency improvement.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an infinite-level water-blocking switch sliding sleeve, including a sliding sleeve and a switching tool. The sliding sleeve includes an upper connector, a positioning claw, an upper connecting piece, a working cylinder, an outer tube, a lower connecting piece, a retaining ring, a lower connector, an upper sealing assembly, and a lower sealing piece. The upper connector, outer tube, and lower connector are sequentially threadedly connected from top to bottom to form the outer sleeve cylinder. The positioning claw, upper connecting piece, working cylinder, lower connecting piece, and retaining ring are sequentially threadedly connected from top to bottom to form the inner sliding cylinder. The upper connector is provided with a radial liquid passage hole. The inner sliding cylinder is slidably disposed on the upper connector and the inner wall of the outer sleeve cylinder. Through the annular space formed between the upper sealing assembly and the lower sealing piece at both ends of the inner sliding cylinder and the upper connector and the inner wall of the outer tube, the radial liquid passage hole is opened by the up and down movement of the inner sliding cylinder, thereby controlling the communication between the inner cavity of the sliding sleeve and the outside.

[0006] The switching tool includes an upper connector, an upper cone, a central tube, an upper slip, an upper sheath, a pin, a straightening sleeve, a lower slip, a lower sheath, a lower cone, a load positioning sleeve, a guide head, and a spring straightening plate. The upper connector, central tube, load positioning sleeve, and guide head are threadedly connected to form the main body of the switching tool. The upper slip, upper sheath, straightening sleeve, lower slip, and lower sheath are threadedly connected to form the sliding component of the switching tool. The outer side of the central tube is milled with bidirectional tracks of varying lengths. A pin is radially mounted on the straightening sleeve, with one end of the pin in the track on the outer side of the central tube and the other end inside the upper sheath. The outer diameter of the outer boss of the load positioning sleeve is larger than the inner diameter of the lower connector, and the radial contraction of the outer boss of the load positioning sleeve allows it to pass through the lower connector. A spring straightening plate is mounted on the outer side of the straightening sleeve, and the spring straightening plate can be radially compressed on the straightening sleeve, allowing it to pass through the sliding sleeve after compression.

[0007] The outer side of the straightening sleeve is equipped with 3-4 evenly distributed spring straightening plates.

[0008] The upper connector has two expansion grooves on its inner side. The locating claw's split claw can retract radially, and the ends of the locating claw's split claw are fitted with the two expansion grooves on the inner side of the upper connector. When the sliding inner cylinder moves to the lower dead point, the retaining ring contacts the lower connector, preventing the sliding inner cylinder from moving downward.

[0009] The lower connector has three diameter reduction steps on its inner side.

[0010] The beneficial effects of this invention are: enabling multi-layer, arbitrary number of layers, and arbitrary combination of layers for mining, further improving the reliability of the technology, extending the service life of key tools and tubing, reducing workload, lowering operating costs, accurately understanding the production capacity of each layer, and improving the timeliness of oilfield production. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the sliding sleeve portion of the infinite-level water-blocking switch sliding sleeve of the present invention;

[0012] Figure 2 This is a schematic diagram of the switching tool part of the infinite-level water-blocking switch sliding sleeve of the present invention;

[0013] Figure 3 This is a diagram of the central tube track of the switching tool for the infinite-level water-blocking switch sliding sleeve of the present invention;

[0014] Figure 4 This is a schematic diagram of the upper connector of the sliding sleeve of the water-blocking switch of the present invention;

[0015] Figure 5 This is a schematic diagram of the positioning claw of the sliding sleeve of the water-blocking switch of the present invention;

[0016] Figure 6 for Figure 5 BB cross-section diagram.

[0017] Figure 7 This is a schematic diagram of the lower connector of the sliding sleeve of the water-blocking switch of the present invention.

[0018] In the diagram: 1-Upper connector, 2-Positioning claw, 3-Upper connector, 4-Working cylinder, 5-Outer tube, 6-Lower connector, 7-Retaining ring, 8-Lower connector, 9-Upper sealing assembly, 10-Lower sealing assembly, 11-Upper connector, 12-Upper cone, 13-Center tube, 14-Upper slip, 15-Upper sheath, 16-Pin, 17-Straightening sleeve, 18-Lower slip, 19-Lower sheath, 20-Lower cone, 21-Load positioning sleeve, 22-Guide head, 23-Spring straightening plate, 24-Long track top dead point, 25-Short track top dead point, 26-Short track bottom dead point, 27-Long track bottom dead point. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" 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 an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] like Figure 1-6As shown, a limit-limit water-blocking switch sliding sleeve of the present invention includes a sliding sleeve and a switching tool. The sliding sleeve includes an upper connector 1, a positioning claw 2, an upper connecting piece 3, a working cylinder 4, an outer tube 5, a lower connecting piece 6, a retaining ring 7, a lower connector 8, an upper sealing assembly 9, and a lower sealing piece 10. The upper connector 1, the outer tube 5, and the lower connector 8 are sequentially threadedly connected from top to bottom to form the outer cylinder of the sliding sleeve. The positioning claw 2, the upper connecting piece 3, the working cylinder 4, the lower connecting piece 6, and the retaining ring 7 are sequentially threadedly connected from top to bottom to form the inner cylinder of the sliding sleeve. The upper connector 1 is provided with a radial liquid passage hole 24. The inner cylinder of the sliding sleeve is slidably disposed on the inner wall of the upper connector 1 and the outer tube 5 of the outer cylinder of the sliding sleeve. Through the annular space formed between the upper sealing assembly 9 and the lower sealing piece 10 at both ends of the inner cylinder and the inner wall of the upper connector 1 and the outer tube 5, the radial liquid passage hole 24 is opened by the up and down movement of the inner cylinder, thereby controlling the communication between the inner cavity of the sliding sleeve and the outside.

[0023] The switching tool includes an upper connector 11, an upper cone 12, a central tube 13, an upper slip 14, an upper sheath 15, a pin 16, a straightening sleeve 17, a lower slip 18, a lower sheath 19, a lower cone 20, a load positioning sleeve 21, a guide head 22, and a spring straightening plate 23. The upper connector 11, central tube 13, load positioning sleeve 21, and guide head 22 are connected by threads to form the main body of the switching tool, while the upper slip 14, upper sheath 15, straightening sleeve 17, lower slip 18, and lower sheath 19 are connected by threads to form the switching tool body. The central tube 13 has a sliding component, and the outer side of the central tube 13 is milled with bidirectional tracks of different lengths. The straightening sleeve 17 is radially mounted with a pin 16. One end of the pin 16 is in the track on the outer side of the central tube 13, and the other end of the pin 16 is inside the upper protective sleeve 15. The outer diameter of the outer boss of the load positioning sleeve 21 is larger than the inner diameter of the lower connector 8. The outer boss of the load positioning sleeve 21 can be radially contracted to pass through the lower connector 8. A spring straightening plate 23 is installed on the outer side of the straightening sleeve 17. The spring straightening plate 23 can be radially compressed on the straightening sleeve 17 and can pass through the sliding sleeve after compression.

[0024] Preferably, 3-4 evenly distributed spring straightening plates 23 are installed on the outer side of the straightening sleeve 17.

[0025] The upper connector 1 has two expansion grooves on its inner side. The lobed claw of the positioning claw 2 can retract radially. The ends of the lobed claw of the positioning claw 2 are fitted with the two expansion grooves on the inner side of the upper connector 1. When the sliding inner cylinder moves to the lower dead point, the retaining ring 7 contacts the lower connector 8 to prevent the sliding inner cylinder from moving downward.

[0026] The infinite-level water-blocking switch sliding sleeve of the present invention achieves the opening and closing of the target layer through the cooperation of the sliding sleeve and the switching tool. The positioning claw 2, upper connector 3, working cylinder 4, lower connector 6, and retaining ring 7 are connected by threads and can move inside the outer tube 5. When the assembly of positioning claw 2, upper connector 3, working cylinder 4, lower connector 6, and retaining ring 7 moves to the upper dead point, the sliding sleeve is in the closed state. When the assembly of positioning claw 2, upper connector 3, working cylinder 4, lower connector 6, and retaining ring 7 moves to the lower dead point, the sliding sleeve is in the open state, and the bottom liquid can enter the tubing through the radial hole of the upper connector 1. The upper and lower jaws of the switching tool are anchored to the working cylinder via the central tube's track. When the upper jaw is anchored, pushing the switching tool downwards opens the sliding sleeve. When the lower jaw is anchored, lifting the switching tool upwards closes the sliding sleeve. The outer diameter of the outer boss of the load positioning sleeve 21 is larger than the inner diameter of the lower connector 8. The radial contraction of the outer boss of the load positioning sleeve 21 requires 2 tons of resistance to pass through the lower connector 8, ensuring a proper fit between the sliding sleeve and the switching tool. The segmented claw of the positioning claw 2 can contract radially. The ends of the segmented claw 2 engage with two grooves on the inner side of the upper connector 1, requiring a force of 200 kg to move the working cylinder assembly, ensuring the sliding sleeve does not open or close accidentally.

[0027] The specific implementation of the infinite-level water blockage detection switch sliding sleeve of the present invention includes the following steps:

[0028] (1) Washing and pressing well

[0029] (2) Demolish the wellhead

[0030] (3) Lift the sucker rod

[0031] (4) Drag the production line (switch tool) into the drop line.

[0032] (5) Sliding sleeve from open to closed: During normal production, the switching tool is suspended above the production tubing. When the switching tool enters the sliding sleeve, the load positioning sleeve 21 rubs against the three reduced-diameter steps of the lower connector 8. The wellhead weight indicator shows the load change, indicating that the switching tool is inside the working cylinder 4. At this time, the pin 16 of the switching tool is at the dead point 25 on the short track. Then, the switching tool is lifted up by 1 meter and then lowered. The pin 16 is at the dead point 25 on the long track. The upper slip 14 is opened and anchored to the working cylinder 4 under the action of the upper cone 12. The switching tool is lowered further to open the sliding sleeve.

[0033] (6) Sleeve opening from closed: During normal production, the switching tool is suspended above the production tubing. When the switching tool enters the sleeve, the load positioning sleeve 21 rubs against the three reduced-diameter steps of the lower connector 8. The wellhead weight indicator shows a load change, indicating that the switching tool is inside the working cylinder 4. At this time, the pin 16 of the switching tool is at the upper dead point 25 of the short track. The switching tool is lifted 2 meters, and the pin 16 is at the lower dead point 27 of the long track. The lower slip 19 is opened and anchored to the working cylinder 4 under the action of the lower cone 20. The switching tool is continued to be lifted to close the sleeve. Finally, the switching tool is lowered and lifted again until the pin 16 is at the lower dead point 26 of the short track, and then the switching tool is lifted again.

[0034] (7) After raising the production tubing string, install the tubing hanger.

[0035] (8) Install the oil well tree and pump.

[0036] In summary, the content of this invention is not limited to the above-described embodiments. Those skilled in the art can easily propose other embodiments within the technical guiding principles of this invention, but such embodiments are all included within the scope of this invention.

Claims

1. An infinitely variable water blockage locator sliding sleeve, comprising a sliding sleeve and a switching tool, characterized in that, The sliding sleeve includes an upper connector (1), a positioning claw (2), an upper connector (3), a working cylinder (4), an outer tube (5), a lower connector (6), a retaining ring (7), a lower connector (8), an upper sealing assembly (9), and a lower sealing element (10). The upper connector (1), the outer tube (5), and the lower connector (8) are connected by threads from top to bottom to form the outer cylinder of the sliding sleeve. The positioning claw (2), the upper connector (3), the working cylinder (4), the lower connector (6), and the retaining ring (7) are connected by threads from top to bottom to form the inner cylinder of the sliding sleeve. The upper connector (1) is provided with a radial liquid passage hole (24). The inner cylinder of the sliding sleeve is slidably disposed on the inner wall of the upper connector (1) and the outer tube (5) of the outer cylinder of the sliding sleeve. Through the annular space formed between the upper sealing assembly (9) and the lower sealing element (10) at both ends of the inner cylinder and the inner wall of the upper connector (1) and the outer tube (5), the radial liquid passage hole (24) is opened by the up and down movement of the inner cylinder, thereby controlling the communication between the inner cavity of the sliding sleeve and the outside world. The switching tool includes an upper connector (11), an upper cone (12), a central tube (13), an upper slip (14), an upper sleeve (15), a pin (16), a straightening sleeve (17), a lower slip (18), a lower sleeve (19), a lower cone (20), a load positioning sleeve (21), a guide head (22), and a spring straightening plate (23). The upper connector (11), the central tube (13), the load positioning sleeve (21), and the guide head (22) are connected by threads to form the main body of the switching tool. The upper slip (14), the upper sleeve (15), the straightening sleeve (17), the lower slip (18), and the lower sleeve (19) are fixed by threads. The connecting components form a sliding part of the switch tool. The outer side of the central tube (13) is milled with bidirectional tracks of varying lengths. The straightening sleeve (17) is radially mounted with a pin (16). One end of the pin (16) is in the track outside the central tube (13), and the other end of the pin (16) is inside the upper sleeve (15). The outer diameter of the outer boss of the load positioning sleeve (21) is larger than the inner diameter of the lower connector (8). The outer boss of the load positioning sleeve (21) can be radially contracted to pass through the lower connector (8). A spring straightening plate (23) is installed on the outer side of the straightening sleeve (17). The spring straightening plate (23) can be radially compressed on the straightening sleeve (17) and can pass through the sliding sleeve after compression.

2. The infinite-level water-blocking switch sliding sleeve according to claim 1, characterized in that, The outside of the straightening sleeve (17) is equipped with 3-4 evenly distributed spring straightening plates (23).

3. The infinite-level water-blocking switch sliding sleeve according to claim 1, characterized in that, The upper connector (1) has two expansion grooves on its inner side. The split claw of the positioning claw (2) can retract radially. The end of the split claw of the positioning claw (2) is fitted with the two expansion grooves on the inner side of the upper connector (1). When the sliding inner cylinder moves to the lower dead point, the retaining ring (7) contacts the lower connector (8) to prevent the sliding inner cylinder from moving downward.

4. The infinite-level water-blocking switch sliding sleeve according to claim 1, characterized in that, The lower connector (8) has three diameter reduction steps on its inner side.

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