A packer rubber with a flexible protective screen

Abstract

The patent discloses a packer rubber sleeve with flexible protective net, and particularly relates to the field of oil and gas development well completion. The packer rubber sleeve with flexible protective net comprises a top shoe, a flexible protective net, a rubber sleeve, a bottom shoe, a center tube, a roller, and a roller center rod. A new type of flexible protective net is added outside the rubber sleeve. The rubber sleeve can be protected from erosion by drilling fluid during lowering, and the friction between the rubber sleeve and the casing wall is reduced. The center tube moves downward, the static friction between the center tube and the flexible protective net causes the flexible protective net to move, the flexible protective net is recovered to the inside of the top shoe, the rubber sleeve is compressed and expanded, and the setting is completed. The rubber roller in the top shoe protects the flexible protective net from being damaged during movement, reduces friction, and improves setting efficiency. Compared with the traditional rubber sleeve sealing, the packer rubber sleeve has stronger anti-erosion and sealing capacity, and the structure can be used for any permanent packer, and has a wide popularization prospect.

Description

Technical Field

[0001] This utility model relates to a supporting device for oil well drilling, specifically a packer sleeve with a flexible protective net. Background Technology

[0002] Packers are crucial tools in oil and gas field cementing and production processes. As oil and gas field development deepens, the requirements for the reliability, temperature resistance, pressure resistance, and sealing performance of downhole tools such as packers are constantly increasing. Especially when packers are operating in deep and ultra-deep well sections, they struggle to effectively isolate high-pressure oil and gas products. Furthermore, the downhole environment is complex, and the tubing string experiences complex stresses. During packer deployment, there are risks such as collision and wear between the packer sleeve and casing wall, damage leading to instability and premature unsealing, and, more seriously, deformation and damage to the tubing string.

[0003] Existing Chinese patent document CN202323021634.9 discloses a high-temperature and high-pressure packer rubber sleeve structure, which improves the technical problems of poor stability and short service life of packer rubber sleeves. The device includes a central rubber sleeve, with side rubber sleeves and a clamping part symmetrically arranged at its upper and lower ends. The central rubber sleeve and the two side rubber sleeves are made of high-temperature resistant fluororubber material. The side rubber sleeves are used to clamp and support the central rubber sleeve, and the clamping part tightly presses the corresponding side rubber sleeves against the corresponding ends of the central rubber sleeve. This utility model adopts a three-section rubber sleeve structure, that is, by using the two side rubber sleeves to jointly clamp and support the central rubber sleeve, it ensures the tightness between the central rubber sleeve and the inner wall of the wellbore, thereby ensuring a tight seal between the central rubber sleeve and the inner wall of the wellbore. This improves the stability of the packer rubber sleeve and extends its service life.

[0004] Existing Chinese patent document CN202110062086.0 discloses a sulfur-resistant, acid-resistant, high-temperature, and high-pressure packer cartridge and packer, including a central tube and a cartridge body. The cartridge body is sleeved outside the central tube and slidably connected to the central tube. Protective mechanisms are provided at the top and bottom of the cartridge body. A support mechanism is provided at the bottom of the central tube, and a sealing mechanism is provided at the top of the central tube. The protective mechanisms include a first movable ring and a second movable ring, both sleeved outside the central tube and slidably connected to the central tube. The first movable ring is fixedly connected to the cartridge body. This invention, by providing protective mechanisms at both the top and bottom of the cartridge body, and the sealing rings of the protective mechanisms sealing the upper and lower ends of the cartridge body, prevents corrosion from harsh working environments and effectively protects the cartridge body.

[0005] In practical use, the above solutions are difficult to implement and have low tool reliability, while the traditional rubber sleeve method provides only a small improvement in the overall sealing performance of the packer.

[0006] In view of this, there is a need for a new, simple, and reliable packer sleeve structure to address the problems existing in the prior art. Utility Model Content

[0007] The main objective of this invention is to provide a packer sleeve with a flexible protective net. During the descent, the packer sleeve is subject to erosion by drilling fluid, friction between the sleeve and the casing wall, and collision with drilling cuttings. A novel flexible protective net is added to the outside of the packer sleeve to protect it from external damage. After the packer reaches the predetermined setting position, the central tube moves downwards, and the flexible protective net moves under static friction. The flexible protective net is then retracted into the gap inside the top shoe, compressing the packer sleeve and completing the setting process. This novel packer sleeve with a flexible protective net has advantages such as stable structure, high reliability, and strong sealing performance, solving the problem of premature setting or sleeve damage due to external forces.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0009] This utility model provides a packer rubber tube with a flexible protective net, including a top shoe, a rubber tube, a bottom shoe, a central tube, a flexible protective net, a rubber roller, and a roller center rod, wherein the top shoe, rubber tube, and bottom shoe are fitted outside the central tube, and the rubber tube is located between the top shoe and the bottom shoe.

[0010] Optionally or preferably, the top shoe has a roller groove inside, a roller center rod is installed inside the roller groove, and a rubber roller is installed on the roller center rod.

[0011] Optionally or preferably, the flexible protective net is fitted onto the outside of the top shoe, rubber tube, and bottom shoe. The central tube clamps the flexible protective net with rubber rollers on the vertical plane inside the top shoe. When the shoe is seated, the central tube moves downward, causing the flexible protective net to move.

[0012] Optionally or preferably, the flexible protective net has high flexibility, high protective strength, and easy deployment, with an inscribed circle diameter of not less than 50mm, including but not limited to metal woven net.

[0013] Optionally or preferably, a number of rubber rollers are installed on the vertical surface inside the top shoe, and a number of rollers are installed on the gap plane, which are evenly distributed in the circumference. The rubber rollers on the vertical surface and the rubber rollers on the gap plane are on the same plane.

[0014] Compared with the prior art, the embodiments of this utility model have at least the following beneficial effects:

[0015] 1. This utility model adds a new type of flexible protective net to the outside of the traditional rubber sleeve, which avoids damage to the rubber sleeve from drilling fluid erosion and casing wall friction during the lowering process. Compared with the traditional rubber sleeve seal, the packer rubber sleeve has stronger anti-erosion and sealing capabilities.

[0016] 2. The structure of this utility model can be used for any permanent packer, and has extremely broad prospects for promotion. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the flexible protective net in the recycling state of this utility model;

[0019] Figure 3 This is a schematic diagram of the initial state of the flexible protective net of this utility model;

[0020] Figure 4 This is an enlarged structural diagram of the flexible protective net in the recovery state of this utility model;

[0021] Figure 5 This is an enlarged structural diagram of the flexible protective net of this utility model in its initial state.

[0022] Figure 6 This is a top view of the present invention.

[0023] In the diagram: 1. Central tube; 2. Flexible protective net; 3. Top shoe; 301. Top shoe groove; 4. Rubber tube; 5. Bottom shoe; 6. Roller center rod; 7. Rubber roller. Detailed Implementation

[0024] To make the technical means, creative features, objectives, and effects of this patent easier to understand, the present invention will be further described below in conjunction with specific embodiments. 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.

[0025] like Figures 1 to 6 As shown:

[0026] This utility model provides a packer rubber tube with a flexible protective net, including a central tube 1, a flexible protective net 2, a top shoe 3, a rubber tube 4, a bottom shoe 5, a roller center rod 6, and a rubber roller 7. The top shoe 3, rubber tube 4, and bottom shoe 5 are fitted outside the central tube 1, with the rubber tube 4 located between the top shoe 3 and the bottom shoe 5. The flexible protective net wraps around the top shoe 2, rubber tube 4, and bottom shoe 5. The roller 7 at the vertical wall of the central tube 1 and the top shoe 3 clamps the flexible protective net 2.

[0027] As an optional or preferred embodiment, the top shoe has a roller groove inside, a roller center rod is installed inside the roller groove, and a rubber roller is installed on the roller center rod.

[0028] As an optional or preferred embodiment, the flexible protective net is fitted onto the outside of the top shoe, rubber tube, and bottom shoe. When the central tube and the rubber roller of the top shoe press down on the flexible protective net to seal it, the central tube moves downward, causing the flexible protective net to move.

[0029] As an optional or preferred feature, the flexible protective net has high flexibility, high protective strength, and easy deployment, with an inscribed circle diameter of not less than 50mm, including but not limited to metal woven net.

[0030] As an optional or preferred embodiment, a number of rubber rollers are installed on the vertical surface inside the top shoe, and a number of rubber rollers are installed on the gap plane, which are evenly distributed in the circumference. The rubber rollers on the vertical surface and the rubber rollers on the gap plane are on the same plane.

[0031] The working principle of this utility model patent is as follows:

[0032] During the lowering of the packer, the packer sleeve 4 is in its initial state, and the flexible protective net 2 is fitted onto the outside of the top shoe 3, sleeve 4, and bottom shoe 5. When the predetermined working position is reached, the central tube 1 presses down, driving the flexible protective net 2 to move. The packer flexible protective net 2 is in a retracted state, and the rubber roller 7 inside the top shoe 3 reduces the friction of the flexible protective net 2 against the inside. At this time, the flexible protective net 2 is retracted into the internal gap plane of the top shoe 3, and the sleeve 4 expands under pressure to complete the sealing. When unsealing, the central tube 1 moves up, driving the flexible protective net 2 to move and refit onto the outside of the top shoe 3, sleeve 4, and bottom shoe 5.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A packer sleeve with a flexible protective net, characterized in that, It includes a central tube (1), a flexible protective net (2), a top shoe (3), a rubber tube (4), a bottom shoe (5), a roller center rod (6), and a rubber roller (7). The top shoe (3), the rubber tube (4), and the bottom shoe (5) are fitted outside the central tube (1), and the rubber tube (4) is located between the top shoe (3) and the bottom shoe (5).

2. The packer sleeve with a flexible protective net according to claim 1, characterized in that, The top shoe (3) has a roller groove (301) inside, the roller center rod (6) is installed inside the roller groove (301), and the rubber roller (7) is installed on the roller center rod (6).

3. The packer sleeve with a flexible protective net according to claim 1, characterized in that, The flexible protective net (2) is fitted onto the outside of the top shoe (3), the rubber tube (4) and the bottom shoe (5). The central tube (1) and the rubber roller (7) on the vertical plane inside the top shoe (3) clamp the flexible protective net (2). When the seat is sealed, the central tube (1) moves down, causing the flexible protective net (2) to move.

4. A packer sleeve with a flexible protective net according to claim 1, characterized in that, The top shoe (3) has several rubber rollers (7) installed on its vertical surface and several rubber rollers (7) installed on its gap plane. They are evenly distributed in the circumference. The rubber rollers (7) on the vertical surface and the rubber rollers (7) on the gap plane are on the same plane.

5. A packer sleeve with a flexible protective net according to claim 1, characterized in that, The flexible protective net (2) has high flexibility, high protective strength, and easy deployment. The diameter of the inscribed circle of the mesh is not less than 50mm, including but not limited to metal woven mesh.

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