Top packer for oil exploitation equipment

Abstract

The top packer for the oil exploitation equipment comprises a connecting pipe and a fixing pipe, the connecting pipe and the fixing pipe are fixedly connected, fixing bearings are installed on the outer wall of the connecting pipe and the outer wall of the fixing pipe respectively, each fixing bearing is composed of an inner ring and an outer ring, an oil cavity is formed in the outer ring, and the oil cavity is communicated with the inner ring. And four auxiliary plates which are annularly distributed are mounted on the outer wall of the outer ring. The fixed bearing is installed on the outer wall of the packer, the auxiliary moving plates are arranged on the surface of the fixed bearing, the auxiliary moving balls are movably installed on the surfaces of the auxiliary moving plates, and when the packer is placed in an oil pipe or a sleeve, the auxiliary moving balls replace the outer wall of the packer to be in direct contact with the inner wall of the oil pipe or the sleeve. The problem of abrasion generated after the metal surface of the packer, a rubber sleeve or a coupling makes contact with the inner wall of a pipeline in the placing process can be solved, the service life of the packer is prolonged, the oil cavity is formed in the outer ring of the fixed bearing and can lubricate the auxiliary balls, the service life is prolonged, and the using effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of oil extraction technology, specifically to a top packer for oil extraction equipment. Background Technology

[0002] In intelligent well completion technology for oil extraction, the top packer is a key tool used to seal the annulus between the downhole casing and tubing, enabling stratified control. Its core function is to optimize oil and gas extraction efficiency by sealing the oil layer and, in conjunction with the tubing, enabling signal transmission and hydraulic control between the surface and downhole tools.

[0003] Existing packers need to be run into the target well section through tubing or casing. The outer surface of the packer is in direct contact with the tubing wall. Under the influence of gravity, wellbore bending, or tool eccentricity, localized high-pressure sliding friction can occur, potentially scratching the casing's anti-corrosion coating on the metal packer edges, rubber sleeves, or couplings, inducing localized corrosion. Sealing element wear: The rubber sleeve surface may prematurely break down due to friction before setting, reducing sealing reliability. Therefore, a top packer for oil extraction equipment is proposed. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a top packer for oil extraction equipment, solving the following problems: Existing packers require being run into the target well section via tubing or casing, with the packer's outer surface in direct contact with the tubing wall. Under gravity, wellbore bending, or tool eccentricity, localized high-pressure sliding friction can occur, potentially scratching the casing's anti-corrosion coating and inducing localized corrosion. Additionally, there is the issue of sealing element wear: the rubber sleeve surface may prematurely break down due to friction before setting, reducing sealing reliability.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a top packer for oil extraction equipment, comprising a connecting pipe and a fixed pipe, wherein the connecting pipe and the fixed pipe are fixedly connected and both the connecting pipe and the fixed pipe are fitted with fixed bearings on their outer walls. Each fixed bearing consists of an inner ring and an outer ring. An oil cavity is formed inside the outer ring. Four auxiliary plates arranged in a ring are installed on the outer wall of the outer ring. A plurality of ball holes are evenly distributed on the surface of each auxiliary plate. Auxiliary balls are movably installed in each ball hole, and the ends of the ball holes are connected to the oil cavity. An oil guide channel is provided in the middle of the back side of the auxiliary plate. The oil guide channel has a T-shaped structure and is connected to both the ball holes and the oil cavity.

[0008] As a further preferred embodiment of this utility model, a cage and several bearing balls are installed between the inner ring and the outer ring, several fixed columns are installed inside the oil cavity, an oil inlet is provided on the surface of the outer ring, and a one-way valve is installed inside the oil inlet.

[0009] As a further preferred embodiment of this utility model, both the fixed tube and the connecting tube are provided with connecting posts at their ends. The connecting posts pass through the fixed bearing, and a fixed sleeve is connected to the end of the connecting posts. A connector is installed at the front end of the fixed sleeve.

[0010] As a further preferred embodiment of this utility model, the fixed sleeve has a screw hole inside, the connecting column has a threaded structure on its surface and is threadedly connected to the fixed sleeve through the threaded structure, and both the fixed sleeve and the connecting column have fixing holes on their outer walls, in which fixing bolts are installed.

[0011] As a further preferred embodiment of this utility model, the connection between the oil guide channel and the inner cavity and the ball bearing hole is a funnel-shaped structure.

[0012] As a further preferred embodiment of this utility model, a plurality of movable holes are provided on the outer wall of the fixed tube, and an anchor plate is movably installed in the movable holes. A rubber bladder is also fixed on the outer wall of the fixed tube.

[0013] (III) Beneficial Effects

[0014] This utility model provides a top packer for oil extraction equipment. It has the following advantages:

[0015] This invention features a fixed bearing installed on the outer wall of the packer. Several auxiliary plates are arranged on the surface of the fixed bearing, and auxiliary balls are movably mounted on the surface of the auxiliary plates. When the packer is inserted into the oil pipe or casing, the auxiliary balls replace the outer wall of the packer in direct contact with the inner wall of the oil pipe or casing. This avoids wear problems that occur when the metal surface of the packer, the rubber sleeve, or the coupling comes into contact with the inner wall of the pipe during insertion, thus improving the service life of the packer. An oil cavity is provided inside the outer ring of the fixed bearing to lubricate the auxiliary balls, further improving service life and performance. Attached Figure Description

[0016] Figure 1 This is an external structural diagram of the top packer for oil extraction equipment described in this utility model;

[0017] Figure 2 This is a diagram showing the internal structure of the fixed bearing described in this utility model;

[0018] Figure 3 for Figure 2 Enlarged view of A in the middle;

[0019] Figure 4 This is a structural diagram of the connection between the fixing tube and the fixing sleeve described in this utility model.

[0020] In the diagram: 1. Connecting pipe; 2. Rubber bladder; 3. Anchor plate; 4. Fixing pipe; 5. Auxiliary ball bearing; 6. Auxiliary plate; 7. Fixed bearing; 8. Fixed sleeve; 9. Connecting head; 10. Outer ring; 11. Inner ring; 12. Oil cavity; 13. Oil inlet; 14. Fixing post; 15. Connecting post; 16. Fixing bolt; 17. Threaded structure; 18. Threaded hole; 19. Fixing hole; 20. Ball bearing hole; 21. Oil guide channel. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-4 This utility model provides a technical solution: a top packer for oil extraction equipment, including a connecting pipe 1 and a fixed pipe 4. The connecting pipe 1 and the fixed pipe 4 are fixedly connected, and both the connecting pipe 1 and the fixed pipe 4 are equipped with fixed bearings 7 on their outer walls. The fixed bearings 7 consist of an inner ring 11 and an outer ring 10. An oil cavity 12 is formed inside the outer ring 10. Four auxiliary plates 6 are installed on the outer wall of the outer ring 10 in a ring arrangement. A plurality of ball holes 20 are evenly opened on the surface of the auxiliary plates 6. Auxiliary balls 5 are movably installed in the ball holes 20. The ends of the ball holes 20 are connected to the oil cavity 12. An oil guide channel 21 is opened in the middle of the back of the auxiliary plates 6. The oil guide channel 21 has a T-shaped structure and is connected to the ball holes 20 and the oil cavity 12 respectively. The moving balls replace the outer wall of the packer to directly contact the inner wall of the oil pipe or casing, which can avoid the wear problem that occurs after the metal surface of the packer, the rubber sleeve or the coupling comes into contact with the inner wall of the pipe during the insertion process.

[0023] Further improvements include a cage and several bearing balls installed between the inner ring 11 and the outer ring 10; several fixing posts 14 installed inside the oil cavity 12; and an oil inlet 13 with a one-way valve installed on its surface, allowing oil to be added to the oil cavity 12. The oil cavity 12 continuously supplies oil to the ball bearing holes 20, forming a dynamic lubricating film and reducing the risk of cuttings jamming in the well.

[0024] In a further improvement, both the fixed pipe 4 and the connecting pipe 1 are provided with connecting posts 15 at their ends. The connecting posts 15 pass through the fixed bearing 7, and the ends of the connecting posts 15 are connected to the fixed sleeves 8. The front end of the fixed sleeves 8 is fitted with a connecting head 9. The fixed sleeves 8 have screw holes 18 inside, and the surface of the connecting posts 15 has a threaded structure 17, which is threaded to the fixed sleeves 8. The outer walls of both the fixed sleeves 8 and the connecting posts 15 have fixing holes 19, and fixing bolts 16 are installed in the fixing holes 19. The fixing bolts 16 provide secondary fixation for the fixed sleeves 8 and the connecting posts 15. The fixed bearing 7 can be replaced after the fixed sleeves 8 are removed.

[0025] In a further improvement, the connection between the oil guide channel 21 and the inner cavity and the ball bearing hole 20 is a funnel-shaped structure, and some oil enters the ball bearing hole 20 through the oil guide channel 21.

[0026] Further improvements include several movable holes on the outer wall of the fixed pipe 4, with an anchor plate 3 movably installed inside each hole. A rubber bladder 2 is also fixed on the outer wall of the fixed pipe 4. A pressurizing mechanism (not shown in the figure, but a conventional packer pressurizing mechanism) is also installed inside the fixed pipe 4. When the anchor plate 3 is pressurized, it moves out and fits against the inner wall of the pipe, and the rubber bladder 2 is squeezed and fits against the inner wall of the pipe.

[0027] Working principle: Lubricating oil is injected into the oil chamber 12 through the oil inlet 13 and pressurized. Then, the packer is placed in the pipeline. During the movement of the packer, the auxiliary ball 5 contacts the inner wall of the pipeline. During the rotation of the auxiliary ball 5, some oil enters directly from the end of the ball hole 20, and some oil enters the ball hole 20 through the oil guide channel 21 to lubricate the auxiliary ball 5 and improve the stability of use. After reaching the sealing section, the pressurization mechanism is activated (not shown in the figure, a conventional packer pressurization mechanism is used). After the anchor plate 3 is pressed, it moves out and fits against the inner wall of the pipeline. After the rubber bladder 2 is squeezed, it fits against the inner wall of the pipeline. After the sealing is completed, the pressure is released and the packer can be removed.

[0028] The components of this utility model are: 1. connecting pipe; 2. rubber bladder; 3. anchoring plate; 4. fixing pipe; 5. auxiliary ball bearing; 6. auxiliary plate; 7. fixed bearing; 8. fixing sleeve; 9. connector; 10. outer ring; 11. inner ring; 12. oil cavity; 13. oil injection port; 14. fixing column; 15. connecting column; 16. fixing bolt; 17. threaded structure; 18. screw hole; 19. fixing hole; 20. ball bearing hole; 21. oil guide channel. All components are general standard parts or components known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods. The problem solved by this utility model is that existing packers need to be run into the target well section through tubing or casing. The outer surface of the packer is in direct contact with the pipe wall. Under the action of gravity, wellbore bending or tool eccentricity, local high pressure sliding friction is generated. The edge of the metal packer or coupling may scratch the anti-corrosion coating of the casing and induce local corrosion. Wear of sealing elements: The surface of the rubber sleeve is prematurely damaged due to friction before it is set, reducing the reliability of the seal. This utility model addresses this issue by combining the above-mentioned components. A fixed bearing 7 is installed on the outer wall of the packer. Several auxiliary plates 6 are set on the surface of the fixed bearing 7, and auxiliary balls 5 are movably installed on the surface of the auxiliary plates 6. When the packer is inserted into the oil pipe or casing, the auxiliary balls 5 replace the outer wall of the packer in direct contact with the inner wall of the oil pipe or casing. This avoids the wear problem that occurs after the metal surface of the packer, the rubber sleeve or coupling comes into contact with the inner wall of the pipe during the insertion process, thus improving the service life of the packer. An oil cavity 12 is set inside the outer ring 10 of the fixed bearing 7. The oil cavity 12 can lubricate the auxiliary balls 5, improving the service life and performance.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0030] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A top packer for oil extraction equipment, comprising a connecting pipe (1) and a fixing pipe (4), characterized in that: The connecting pipe (1) and the fixed pipe (4) are fixedly connected, and fixed bearings (7) are installed on the outer walls of both the connecting pipe (1) and the fixed pipe (4). The fixed bearing (7) consists of an inner ring (11) and an outer ring (10). An oil cavity (12) is formed inside the outer ring (10). Four auxiliary plates (6) arranged in a ring are installed on the outer wall of the outer ring (10). Several ball holes (20) are evenly opened on the surface of the auxiliary plate (6). Auxiliary balls (5) are movably installed in the ball holes (20). The end of the ball holes (20) is connected to the oil cavity (12). An oil guide channel (21) is opened in the middle of the back of the auxiliary plate (6). The oil guide channel (21) has a T-shaped structure and is connected to the ball holes (20) and the oil cavity (12) respectively.

2. A top packer for oil extraction equipment according to claim 1, characterized in that: A retainer and several bearing balls are installed between the inner ring (11) and the outer ring (10). Several fixed columns (14) are installed inside the oil cavity (12). An oil inlet (13) is provided on the surface of the outer ring (10). A one-way valve is installed inside the oil inlet (13).

3. A top packer for oil extraction equipment according to claim 1, characterized in that: Both the fixed tube (4) and the connecting tube (1) are provided with connecting posts (15) at their ends. The connecting posts (15) pass through the fixed bearing (7). The end of the connecting posts (15) is connected to a fixed sleeve (8). The front end of the fixed sleeve (8) is equipped with a connector (9).

4. A top packer for oil extraction equipment according to claim 3, characterized in that: The fixed sleeve (8) has a screw hole (18) inside. The connecting column (15) has a threaded structure (17) on its surface and is threaded to the fixed sleeve (8) through the threaded structure (17). The fixed sleeve (8) and the connecting column (15) both have a fixing hole (19) on their outer walls. A fixing bolt (16) is installed in the fixing hole (19).

5. A top packer for oil extraction equipment according to claim 1, characterized in that: The connection between the oil guide channel (21) and the inner cavity and the ball bearing hole (20) is a funnel-shaped structure.

6. A top packer for oil extraction equipment according to claim 1, characterized in that: The outer wall of the fixed tube (4) has several movable holes, and an anchor plate (3) is movably installed in the movable holes. A rubber bladder (2) is also fixed on the outer wall of the fixed tube (4).

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