Rubber cup sealing element for self-sealing packer

Abstract

The invention relates to the technical field of sealing elements, and discloses a rubber cup sealing element for a self-sealing packer, the rubber cup sealing element comprises a rubber element, a metal framework and a reinforcing wire ring, the metal framework comprises a first part fixedly arranged on the inner wall of the rubber element and a second part embedded in the rubber element, and the reinforcing wire ring wraps the outer wall of the rubber element; and the second part is connected between the first part and the reinforcing wire ring. The metal framework plays a role in supporting the reinforcing wire ring, so that the reinforcing wire ring serves as a main body for supporting the rubber part, the deformation resistance of the rubber part can be improved when the rubber part bears working pressure, the whole rubber part can be evenly stressed when the rubber part bears the working pressure, meanwhile, the reinforcing wire ring has good elasticity, the outer wall of the rubber part is coated with the reinforcing wire ring, and the service life of the rubber part is prolonged. And as an exposed part, friction between the rubber part and the sleeve is reduced, the sealing part can bear high pressure, the rubber part cannot be extruded into a gap between the sleeves, the sealing part is prevented from being damaged, and the service life of the sealing part is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of seals, and in particular to a rubber cup seal for a self-sealing packer. Background Art

[0002] In oil production, packers are used to isolate the pipe string and the wellbore, and isolate the production layer to control the production (injection) fluid and protect the casing. There are five types of packers: expansion type, compression type, self-sealing type, wedge type, and self-expanding type. The main sealing material of the self-sealing leather cup packer seal is rubber. The commonly used sealing structures include pure rubber seals and rubber + metal skeleton seals. In the process of oil production, the failure of the packer to set the seal will cause the oil production operation to not proceed smoothly and increase the cost of wellhead maintenance. In order to ensure the setting of the packer, the seal needs to withstand the increased pressure of 20-35MPa.

[0003] Pure rubber seals have no skeleton to resist pressure. When subjected to high pressure, the seals will be squeezed into the gap between the sleeves, causing damage to the seals. Existing rubber + metal skeleton seals use metal to increase the resistance of the seals, but the metal is a sheet structure with gaps between the sheet metals, which cannot completely prevent rubber from entering the gaps, affecting the service life of the seals. Summary of the invention

[0004] The purpose of the present invention is to provide a rubber cup seal for a self-sealing packer to solve the problem that the seal in the prior art will enter the gap between the casings and be damaged when subjected to high pressure.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a rubber cup seal for a self-sealing sealer, including a rubber part, a metal frame and a reinforcing wire ring, the metal frame including a first part fixedly arranged on the inner wall of the rubber part and a second part embedded in the rubber part, the reinforcing wire ring is covered on the outer wall of the rubber part, and the second part is connected between the first part and the reinforcing wire ring.

[0006] Preferably, the rubber component includes a main body section and a base section located at the bottom of the main body section, the outer wall of the base section shrinks inward from top to bottom, and the inner wall of the main body section expands outward from bottom to top, the reinforcing wire ring is arranged in the main body section, and the metal skeleton is arranged in the base section.

[0007] Preferably, the main body segment includes a first structural segment and a second structural segment, the second structural segment is connected to the base segment, the inner walls of the first structural segment and the second structural segment are both inclined surfaces, the inclination of the inner wall of the first structural segment is greater than the inclination of the inner wall of the second structural segment, the reinforcing wire loop covers the outer wall of the first structural segment, and the reinforcing wire loop covers part of the outer wall of the second structural segment.

[0008] Preferably, the outer wall of the second structural segment is a cylinder extending along the axial direction of the rubber part, the outer wall of the first structural segment includes a first step surface and a second step surface forming a step structure, the outer diameter of the first step surface is greater than the outer diameter of the second step surface, the second step surface is smoothly connected to the outer wall of the second structural segment, the reinforcing wire loop covers the outer wall of the second structural segment and the second step surface, and the outer wall of the reinforcing wire loop is smoothly connected to the first step surface.

[0009] Preferably, the second step surface is an arc-shaped surface convex away from the center line of the rubber member.

[0010] Preferably, the reinforcing wire loops are provided with at least two layers, and the reinforcing wire loops in each layer are stacked and wound.

[0011] Preferably, the reinforcing wire ring and the metal skeleton are distributed in sequence along the axial direction of the rubber component, and the bottom end of the reinforcing wire ring and the top end of the second part are provided with mutually adaptable assembly steps, and the reinforcing wire ring and the second part are fixedly connected via the assembly steps.

[0012] Preferably, an annular platform is provided at the connection between the top end of the first part and the bottom end of the second part, and the longitudinal section of the annular platform is a rectangular structure.

[0013] Preferably, the reinforcing wire ring is a metal part or a high-strength fiber braided part.

[0014] Compared with the prior art, a rubber cup seal for a self-sealing sealer according to an embodiment of the present invention has the following beneficial effects: a reinforcing wire ring is coated on the outer wall of the rubber part, and the reinforcing wire ring is fixedly connected to the first part of the metal skeleton through the second part, and the metal skeleton plays a role in supporting the reinforcing wire ring, so that the reinforcing wire ring serves as the main body supporting the rubber part, which can improve the deformation resistance of the rubber part when it is subjected to working pressure, and the entire rubber part can be evenly stressed when it is subjected to working pressure. At the same time, the reinforcing wire ring has good elasticity, and the reinforcing wire ring coats the outer wall of the rubber part to form a full circle of gapless protection. As an exposed part, it reduces the friction between the rubber part and the casing, ensures that the seal can withstand high pressure, and the rubber part will not be squeezed into the gap between the casing, thereby ensuring that the seal is not damaged and improving the life of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of a rubber cup seal for a self-sealing packer of the present invention;

[0016] Figure 2 yes Figure 1 A schematic diagram of the structure of a metal frame and a reinforcing wire ring of a rubber cup seal for a self-sealing packer;

[0017] Figure 3 yes Figure 1 A schematic diagram of the structure of a metal frame of a rubber cup seal for a self-sealing packer;

[0018] Figure 4 yes Figure 1 A schematic diagram of the structure of a rubber cup seal for a self-sealing packer after omitting the reinforcing wire ring;

[0019] Figure 5 The invention is a schematic diagram of the state of the rubber cup seal for the self-sealing packer when sealing the casing.

[0020] In the figure, 1, rubber part, 11, main body section, 111, first structural section, 112, second structural section, 12, base section, 13, first step surface, 14, second step surface, 2, metal skeleton, 21, first part, 22, second part, 23, annular platform, 3, reinforcing wire ring, 4, assembly step, 5, sleeve. DETAILED DESCRIPTION

[0021] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0022] A preferred embodiment of a rubber cup seal for a self-sealing packer of the present invention is as follows: Figures 1 to 5 As shown, the rubber cup seal for the self-sealing packer includes a rubber part 1, a metal frame 2 and a reinforcing wire ring 3. The rubber part 1 is the sealing structure of the rubber cup seal for the self-sealing packer. The metal frame 2 and the reinforcing wire ring 3 are used to strengthen and protect the rubber part 1. The combination of the two improves the pressure bearing capacity and anti-extrusion ability of the seal.

[0023] The main material of the rubber part 1 is high elastic rubber, and the metal skeleton 2 plays the role of supporting and fixing the reinforcing wire ring 3 and the rubber part 1. In this embodiment, the material of the metal skeleton 2 is an alloy material. The metal skeleton 2 includes a first part 21 and a second part 22. The first part 21 is fixedly arranged on the inner wall of the rubber part 1, and the second part 22 is embedded in the rubber part 1. The first part 21 and the second part 22 are an integrally formed structure. The first part 21 is arranged on the inner wall of the rubber part 1, and plays a supporting and compressive effect on the rubber part 1.

[0024] The reinforcing wire ring 3 is wrapped around the outer wall of the rubber part 1, and plays a role in supporting the rubber part 1 to prevent it from excessive deformation and extrusion. The reinforcing wire ring 3 has excellent softness and good resilience, and can also form a full circle of gapless protection, which can comprehensively prevent rubber extrusion. The reinforcing wire ring 3 is an exposed part, which reduces the friction between the rubber part 1 and the sleeve 5, prevents the seal from being damaged, and improves the service life.

[0025] The second part 22 of the metal skeleton 2 is connected between the first part 21 and the reinforcing wire ring 3. The second part 22 connects the first part 21 and the reinforcing wire ring 3 as a whole, so that the metal skeleton 2 has a supporting effect on the reinforcing wire ring 3. The life of the dense rubber part 1 is increased by the combination of the metal skeleton 2 and the metal wire ring.

[0026] When in use, the outer diameter of the rubber part 1 of the seal is interference fit with the inner diameter of the sleeve 5. After the pressure enters the sleeve 5, the seal seals the sleeve 5 by relying on the interference fit. When the pressure acts on the seal, the rubber part 1 begins to deform. At this time, the reinforcing wire ring 3 provides radial support to the seal to prevent it from excessive deformation and extrusion. The reinforcing wire ring 3, as an exposed part, reduces the friction between the rubber part 1 and the sleeve 5, thereby increasing the life of the seal.

[0027] The rubber cup seal for the self-sealing sealer is coated with a reinforcing wire ring 3 on the outer wall of the rubber part 1, and the reinforcing wire ring 3 is fixedly connected to the first part 21 of the metal skeleton 2 through the second part 22. The metal skeleton 2 plays a role in supporting the reinforcing wire ring 3, so that the reinforcing wire ring 3 serves as the main body supporting the rubber part 1, which can improve the deformation resistance of the rubber part 1 when it is subjected to working pressure, and the entire rubber part 1 can be evenly stressed when it is subjected to working pressure. At the same time, the reinforcing wire ring 3 has good elasticity. The reinforcing wire ring 3 covers the outer wall of the rubber part 1 to form a full circle of gapless protection. As an exposed part, it reduces the friction between the rubber part 1 and the sleeve 5, ensuring that the seal can withstand high pressure, and the rubber part 1 will not be squeezed into the gap between the sleeves 5, ensuring that the seal is not damaged.

[0028] Preferably, the rubber part 1 includes a main body section 11 and a base section 12 located at the bottom of the main body section 11, the outer wall of the base section 12 shrinks inward from top to bottom, and the inner wall of the main body section 11 expands outward from bottom to top, the reinforcing wire ring 3 is arranged in the main body section 11, and the metal skeleton 2 is arranged in the base section 12.

[0029] The main body section 11 and the base section 12 of the rubber member 1 are sequentially distributed along the axial direction thereof, and the outer wall of the base section 12 shrinks inward from the top to the bottom, so that the seal member can enter the sleeve 5 and seal the sleeve 5. The inner wall of the main body section 11 expands outward from the bottom to the top, and the main body section 11 forms an open structure, so that pressure acts on the inner wall of the rubber member 1 from the top to the bottom, so that the rubber member 1 can be squeezed axially and deformed radially, thereby increasing the sealing effect.

[0030] The main section 11 is the main structure that contacts the sleeve 5 when the rubber part 1 is deformed and sealed. The reinforcing wire ring 3 is arranged on the main section 11 to better increase the support and anti-extrusion effect of the reinforcing wire ring 3 on the rubber part 1; at the same time, the metal skeleton 2 is arranged on the base section 12, and the metal skeleton 2 supports and fixes the reinforcing wire ring 3 in the axial direction to increase the life of the rubber part 1.

[0031] Preferably, the main body segment 11 includes a first structural segment 111 and a second structural segment 112, the second structural segment 112 is connected to the base segment 12, the inner walls of the first structural segment 111 and the second structural segment 112 are both inclined surfaces, the inclination of the inner wall of the first structural segment 111 is greater than the inclination of the inner wall of the second structural segment 112, the reinforcing wire loop 3 covers the outer wall of the first structural segment 111, and the reinforcing wire loop 3 covers part of the outer wall of the second structural segment 112.

[0032] The inclination of the inner wall of the first structural segment 111 is greater than that of the inner wall of the second structural segment 112. At the same time, the first structural segment 111 is located at the top of the second structural segment 112. When subjected to pressure, the first structural segment 111 mainly plays the role of axially compressing the rubber component 1, and the second structural segment 112 mainly plays the role of radial expansion and deformation to seal the sleeve 5. The reinforcing wire ring 3 is covered on the outer wall of the first structural segment 111 and part of the outer wall of the second structural segment 112, and the radially deformed sealing part of the seal is fully covered, which has a high utilization rate of the reinforcing wire ring 3 and prevents the seal from excessive radial deformation and extrusion.

[0033] Preferably, the outer wall of the second structural segment 112 is a cylinder extending along the axial direction of the rubber part 1, and the outer wall of the first structural segment 111 includes a first step surface 13 and a second step surface 14 forming a step structure, the outer diameter of the first step surface 13 is greater than the outer diameter of the second step surface 14, the second step surface 14 is smoothly connected to the outer wall of the second structural segment 112, the reinforcing wire ring 3 covers the outer wall of the second structural segment 112 and the second step surface 14, and the outer wall of the reinforcing wire ring 3 is smoothly connected to the first step surface 13.

[0034] The outer wall of the first structural segment 111 forms a stepped structure by the first step surface 13 and the second step surface 14, and a space for arranging the reinforcing wire loop 3 is formed between the step structures, so that the reinforcing wire loop 3 and the first step surface 13 are smoothly connected, and the outer wall of the second structural segment 112 and the second step surface 14 have a smooth transition, thereby reducing the sudden structure on the rubber component 1 and improving the service life of the rubber component 1.

[0035] Preferably, the second step surface 14 is an arc-shaped surface convex away from the center line of the rubber member 1 .

[0036] The second step surface 14 is an arc-shaped surface. When the seal is deformed under pressure, the contact area between the second step surface 14 and the inner wall of the sleeve 5 can be increased, thereby improving the sealing effect.

[0037] Preferably, the reinforcing wire rings 3 are provided with at least two layers, and the reinforcing wire rings 3 of each layer are stacked and wound.

[0038] When the rubber part 1 is deformed under pressure, the reinforcing wire loop 3 is deformed synchronously and contacts the sleeve 5, reducing the friction between the rubber part 1 and the sleeve 5. When the pressure is released and the rubber part 1 is recovered, the reinforcing wire loop 3 can shrink synchronously to protect the rubber part 1. In this embodiment, the reinforcing wire loop 3 can be made of a high-strength fiber braided piece, which can meet the requirements of structural reinforcement of the rubber part.

[0039] The reinforcing wire ring 3 is provided with at least two layers. After the layers of reinforcing wire rings are stacked and wound, a full circle of gapless protection can be formed for the rubber member 1, which can completely prevent the rubber from being squeezed out and avoid the rubber from being damaged.

[0040] Preferably, the reinforcing wire ring 3 and the metal skeleton 2 are distributed in sequence along the axial direction of the rubber component 1 , and the bottom end of the reinforcing wire ring 3 and the top end of the second part 22 are provided with mutually adaptable assembly steps 4 , and the reinforcing wire ring 3 and the second part 22 are fixedly connected via the assembly steps 4 .

[0041] The bottom end of the reinforcing wire loop 3 is fixedly connected to the bottom end of the second part 22 of the metal skeleton 2 via an assembly step 4. The assembly step 4 enables the metal skeleton 2 to have axial and radial support forces on the reinforcing wire loop 3, making the reinforcing wire loop 3 and the metal skeleton 2 more stable after forming a whole.

[0042] Preferably, an annular platform 23 is provided at the connection between the top end of the first part 21 and the bottom end of the second part 22, and the longitudinal section of the annular platform 23 is a rectangular structure.

[0043] When the rubber part 1 is deformed under pressure, the metal skeleton 2 supports the rubber part 1. The connection position between the first part 21 and the second part 22 is a stress concentration area. An annular platform 23 is provided at the connection to increase the strength of the connection between the first part 21 and the second part 22, avoid damage to the metal skeleton 2, and increase the service life of the seal.

[0044] In summary, an embodiment of the present invention provides a rubber cup seal for a self-sealing sealer, wherein the outer wall of the rubber part is covered with a reinforcing wire ring, and the reinforcing wire ring is fixedly connected to the first part of the metal skeleton through the second part, and the metal skeleton plays a role in supporting the reinforcing wire ring, so that the reinforcing wire ring serves as the main body supporting the rubber part, which can improve the deformation resistance of the rubber part when it is subjected to working pressure, and the entire rubber part can be evenly stressed when it is subjected to working pressure. At the same time, the reinforcing wire ring has good elasticity, and the reinforcing wire ring covers the outer wall of the rubber part to form a full circle of gapless protection. As an exposed part, it reduces the friction between the rubber part and the casing, ensures that the seal can withstand high pressure, and the rubber part will not be squeezed into the gap between the casing, thereby ensuring that the seal is not damaged and improving the life of the seal.

[0045] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A rubber cup seal for a self-sealing packer, characterized in that: The invention comprises a rubber member (1), a metal frame (2) and a reinforcing wire ring (3); the metal frame (2) comprises a first part (21) fixedly arranged on the inner wall of the rubber member (1) and a second part (22) embedded in the rubber member (1); the reinforcing wire ring (3) is arranged to cover the outer wall of the rubber member (1); and the second part (22) is connected between the first part (21) and the reinforcing wire ring (3).

2. The rubber cup seal for a self-sealing packer according to claim 1, characterized in that: The rubber component (1) comprises a main body section (11) and a base section (12) located at the bottom of the main body section (11); the outer wall of the base section (12) contracts inward from top to bottom, and the inner wall of the main body section (11) expands outward from bottom to top; the reinforcing wire ring (3) is arranged on the main body section (11); and the metal skeleton (2) is arranged on the base section (12).

3. The rubber cup seal for a self-sealing packer according to claim 2, characterized in that: The main body section (11) comprises a first structural section (111) and a second structural section (112); the second structural section (112) is connected to the base section (12); the inner walls of the first structural section (111) and the second structural section (112) are both inclined surfaces; the inclination of the inner wall of the first structural section (111) is greater than the inclination of the inner wall of the second structural section (112); the reinforcing wire loop (3) covers the outer wall of the first structural section (111), and the reinforcing wire loop (3) covers part of the outer wall of the second structural section (112).

4. The rubber cup seal for a self-sealing packer according to claim 3, characterized in that: The outer wall of the second structural section (112) is a cylindrical surface extending along the axial direction of the rubber component (1); the outer wall of the first structural section (111) comprises a first step surface (13) and a second step surface (14) forming a step structure; the outer diameter of the first step surface (13) is greater than the outer diameter of the second step surface (14); the second step surface (14) is smoothly connected to the outer wall of the second structural section (112); the reinforcing wire ring (3) covers the outer wall of the second structural section (112) and the second step surface (14); and the outer wall of the reinforcing wire ring (3) is smoothly connected to the first step surface (13).

5. The rubber cup seal for a self-sealing packer according to claim 4, characterized in that: The second stepped surface (14) is an arc-shaped surface that bulges away from the center line of the rubber component (1).

6. The rubber cup seal for a self-sealing packer according to any one of claims 1 to 5, characterized in that: The reinforcing wire loops (3) are provided with at least two layers, and the reinforcing wire loops (3) of each layer are stacked and wound.

7. The rubber cup seal for a self-sealing packer according to any one of claims 1 to 5, characterized in that: The reinforcing wire ring (3) and the metal skeleton (2) are sequentially distributed along the axial direction of the rubber component (1); the bottom end of the reinforcing wire ring (3) and the top end of the second part (22) are provided with mutually matching assembly steps (4); the reinforcing wire ring (3) and the second part (22) are fixedly connected via the assembly steps (4).

8. The rubber cup seal for a self-sealing packer according to claim 7, characterized in that: An annular platform (23) is provided at the connection between the top end of the first part (21) and the bottom end of the second part (22), and the longitudinal section of the annular platform (23) is a rectangular structure.

9. The rubber cup seal for a self-sealing packer according to any one of claims 1 to 5, characterized in that: The reinforcing wire ring (3) is a metal part or a high-strength fiber braided part.

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