A low load set packer

Abstract

The application relates to the technical field of oil exploitation equipment, in particular to a low-load setting packer; the packer comprises a center pipe, the upper end of the center pipe is connected with an upper joint, the lower end of the center pipe is connected with a lower joint, an outer pipe and a wedge-shaped pipe are arranged outside the center pipe, the wedge-shaped pipe is located above the outer pipe, a wedge-type rubber cylinder is arranged at the outer upper end of the wedge-shaped pipe, a rubber cylinder seat is arranged below the wedge-type rubber cylinder, a compression-type rubber cylinder, a spacer ring and a cone are sequentially arranged below the rubber cylinder seat; a setting body is arranged outside the front end of the center pipe, a pin is arranged at the connecting position, a slip is arranged outside the rear part of the pin, a friction block is arranged outside the middle part of the setting body, and a plurality of springs are arranged inside the friction block; in the application, the wedge-type rubber cylinder is matched with the wedge-shaped pipe; compared with the traditional packer which relies on pure compression extrusion to realize the expansion of the rubber cylinder, the rubber cylinder can be expanded under a smaller upper pressure in the application, and the required load for setting is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of oil extraction equipment technology, and specifically to a packer with low-load setting. Background Technology

[0002] Packers are tools used to seal the internal space of casing during downhole operations. In existing technologies, packers mainly rely on multiple sections of compressible rubber sleeves to deform under axial pressure and expand outward to form a seal with the inner wall of the casing. However, since the expansion of the compressible rubber sleeves depends entirely on the transmission of pressure, the setting pressure required for different models of packers varies greatly, typically ranging from several tons to tens of tons. In deep wells, long tubing strings, or complex downhole conditions, the setting pressure is easily affected by various factors, resulting in insufficient pressure actually applied to the packer. This can lead to insufficient expansion of the rubber sleeves, poor sealing contact, and ultimately, setting failure. Especially in wells thousands of meters deep, hundreds of tubing lines often need to be run, making the entire construction process time-consuming and labor-intensive. Once the packer fails to set, it needs to be retrieved and the operation restarted, which not only increases construction time but also causes significant economic losses. Summary of the Invention

[0003] The purpose of this invention is to address the deficiencies and shortcomings of the prior art by providing a reasonably designed low-load setting packer that can solve the aforementioned problems.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: It includes a central tube, with an upper connector at the upper end and a lower connector at the lower end. An outer tube and a wedge-shaped tube are sleeved on the outside of the central tube, with the wedge-shaped tube located above the outer tube. A wedge-type rubber tube is provided at the upper end of the wedge-shaped tube, and a rubber tube seat is provided below the wedge-type rubber tube. A compression rubber tube, a spacer ring, and a cone are sequentially arranged below the rubber tube seat. A seat is provided on the outer side of the front end of the central tube, with a pin at the connection and a slip on the outer side of the rear part. A friction block is provided on the outer side of the middle part of the seat, and multiple springs are provided on the inner side of the friction block.

[0005] Preferably, the outer side of the wedge-shaped tube, located at the top of the wedge-type rubber sleeve installation point, has a conical structure, and the top surface of the wedge-type rubber sleeve mates with the conical structure.

[0006] Preferably, the cone and the slip are guided by a conical surface, and when the cone moves downward, the upper end of the slip moves radially outward under the action of the cone.

[0007] Preferably, a pressure relief valve is provided inside the upper connector, and a sealing ring is provided between the pressure relief valve and the wedge tube.

[0008] Preferably, the friction block is arranged along the outer periphery of the seat seal, and multiple springs are located inside the friction block and distributed circumferentially.

[0009] Preferably, a pin is provided at the connection between the seat body and the central tube.

[0010] The beneficial effects of the present invention after adopting the above structure are:

[0011] 1. In this invention, by combining the wedge-type rubber sleeve with the wedge tube, compared with the traditional packer which relies on pure compression to expand the rubber sleeve, the rubber sleeve can expand under a smaller pressure in this application, which greatly reduces the load required for setting the seal.

[0012] 2. In this invention, the wedge-type rubber tube and the compression-type rubber tube are used in combination, which makes the expansion process of the rubber tube more stable and reduces the problem of setting failure caused by insufficient pressure. Attached Figure Description

[0013] Figure 1 This is a structural cross-sectional view of the present invention.

[0014] Explanation of reference numerals in the attached figures:

[0015] 1. Upper connector; 2. Pressure relief valve; 3. Sealing ring; 4. Wedge tube; 5. Wedge-type rubber sleeve; 6. Rubber sleeve seat; 7. Compression rubber sleeve; 8. Spacer ring; 9. Cone; 10. Outer tube; 11. Center tube; 12. Slipper; 13. Spring; 14. Friction block; 15. Sealing body; 16. Pin; 17. Lower connector. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] See Figure 1 This embodiment provides a low-load setting packer, including a central tube 11. The upper end of the central tube 11 is connected to an upper connector 1, and the lower end is connected to a lower connector 17. An outer tube 10 and a wedge tube 4 are sleeved on the outside of the central tube 11, wherein the wedge tube 4 is located above the outer tube 10 and forms a mating relationship with the outer tube 10. A wedge-type rubber sleeve 5 is provided at the upper end of the wedge tube 4. A rubber sleeve seat 6 is provided below the wedge-type rubber sleeve 5. A compression rubber sleeve 7, a spacer ring 8, and a cone 9 are arranged in sequence below the rubber sleeve seat 6. A setting body 15 is provided on the outer side of the front end of the central tube 11. A pin 16 is provided at the connection between the setting body 15 and the central tube 11. A slip 12 is provided on the outer side of the rear part of the setting body 15. A friction block 14 is provided on the outer side of the middle part of the setting body 15. Multiple springs 13 are provided on the inner side of the friction block 14.

[0018] The outer side of the wedge tube 4 forms a conical structure at the top of the installation location of the wedge-type rubber sleeve 5. The top surface of the wedge-type rubber sleeve 5 cooperates with this conical structure, so that the wedge tube 4 can apply a wedging force to the wedge-type rubber sleeve 5 when it moves axially, thereby causing the wedge-type rubber sleeve 5 to deform radially and expand outward to form a seal. The cone 9 and the slip 12 are guided by a conical surface. When the cone 9 moves downward, the upper end of the slip 12 moves radially outward under the action of the cone 9, causing the slip 12 to gradually open outward. A pressure relief valve 2 is provided in the upper connector 1. A sealing ring 3 is provided between the pressure relief valve 2 and the wedge tube 4 to ensure the sealing performance during the internal pressure adjustment process of the packer. The friction block 14 is arranged along the outer periphery of the setting body 15. Multiple springs 13 are located inside the friction block 14 and distributed circumferentially. The pin 16 is used to constrain the position of the setting body 15 before setting to ensure that the state of each component is stable before setting.

[0019] During use, the packer is lowered into the well along with the tubing string. When an axial load is applied to the central tube 11, the central tube 11 causes the wedge tube 4 to move relative to it. The conical fit between the wedge tube 4 and the wedge-type rubber sleeve 5 causes the wedge-type rubber sleeve 5 to open up. The radial expansion of the wedge-type rubber sleeve 5 forms the initial sealing foundation. Subsequently, the compression rubber sleeve 7 deforms further under the continued pressure, and works with the spacer ring 8 and the cone 9 to complete the subsequent setting. At the same time, the cone 9 pushes the slips 12 to move outward along the conical surface. Under the action of the spring 13 and the friction block 14, the slips 12 gradually bite into the inner wall of the casing, thereby completing the setting and anchoring of the packer.

[0020] The installation, connection, or setting methods of the components not detailed above are all common mechanical methods, and the specific structure, model, and coefficient indicators of all their components are their own technologies. As long as they can achieve their beneficial effects, they can be implemented, so they will not be elaborated further.

[0021] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A low-load setting packer, comprising a central tube (11), an upper connector (1) connected to the upper end of the central tube (11) and a lower connector (17) connected to the lower end, an outer tube (10) and a wedge tube (4) sleeved on the outside of the central tube (11), the wedge tube (4) being located above the outer tube (10), characterized in that: A wedge-type rubber tube (5) is provided at the upper outer end of the wedge-shaped tube (4). A rubber tube seat (6) is provided below the wedge-type rubber tube (5). A compression rubber tube (7), a spacer ring (8), and a cone (9) are arranged in sequence below the rubber tube seat (6). A seat (15) is provided on the outer side of the front end of the central tube (11). A pin (16) is provided at the connection point. A slip (12) is provided on the outer side of the rear part. A friction block (14) is provided on the outer side of the middle part of the seat (15). Multiple springs (13) are provided on the inner side of the friction block (14).

2. The packer for low-load setting according to claim 1, characterized in that: The outer side of the wedge tube (4) is located at the top of the installation location of the wedge-type rubber tube (5) and has a conical structure. The top surface of the wedge-type rubber tube (5) is matched with the conical structure.

3. The packer for low-load setting according to claim 1, characterized in that: The cone (9) and the slip (12) are guided by a cone surface. When the cone (9) moves downward, the upper end of the slip (12) moves radially outward under the action of the cone (9).

4. A packer for low-load setting according to claim 1, characterized in that: The upper connector (1) is equipped with a pressure relief valve (2), and a sealing ring (3) is provided between the pressure relief valve (2) and the wedge tube (4).

5. A packer for low-load setting according to claim 1, characterized in that: The friction block (14) is arranged along the outer periphery of the seat (15), and multiple springs (13) are located inside the friction block (14) and distributed circumferentially.

6. A packer for low-load setting according to claim 1, characterized in that: A pin (16) is provided at the connection between the seat (15) and the central tube (11).

Images