A cup seal for a self-sealing packer

Abstract

The application relates to the technical field of sealing elements, and discloses a rubber cup sealing element for a self-sealing packer, which 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. The reinforcing wire ring is arranged on 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 supports the reinforcing wire ring, so that the reinforcing wire ring serves as the main body supporting the rubber element and the anti-deformation capacity of the rubber element under working pressure is improved. The rubber element is uniformly stressed as a whole under working pressure, the reinforcing wire ring has good elasticity, the reinforcing wire ring is arranged on the outer wall of the rubber element, a whole-circle gapless protection is formed, the rubber element and the casing are less rubbed as exposed parts, the sealing element can bear high pressure, the rubber element cannot be squeezed into the gap between the casings, the sealing element is not damaged, and the service life of the sealing element is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sealing elements, in particular to a rubber cup sealing element for a self-sealing packer. BACKGROUND

[0002] In the oil production field, packers are used to seal 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 cup packer sealing element is rubber, and the commonly used sealing element structures include pure rubber sealing element and rubber + metal skeleton sealing element. In the oil production process, the failure of packer setting will cause the oil production operation to be unable to proceed smoothly, and the wellhead maintenance cost will increase. In order to ensure the setting of the packer, the sealing element needs to withstand increased pressure of 20-35 MPa.

[0003] The pure rubber sealing element has no skeleton to resist pressure, and when subjected to high pressure, the sealing element will be squeezed into the gap between the casing, resulting in damage to the sealing element. The existing rubber + metal skeleton sealing element uses metal to increase the resistance of the sealing element, but the metal is in a sheet structure, and there is a gap between the sheet metal, which cannot completely prevent the rubber from entering the gap, affecting the service life of the sealing element. SUMMARY

[0004] The purpose of the present application is to provide a rubber cup sealing element for a self-sealing packer to solve the problem that the existing sealing element will be damaged when subjected to high pressure and enter the gap between the casing.

[0005] In order to achieve the above-mentioned purpose, the present application provides a rubber cup sealing element for a self-sealing packer, which comprises a rubber element, a metal skeleton and a reinforcing wire ring, the metal skeleton 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 is arranged on the outer wall of the rubber element, and the second part is connected between the first part and the reinforcing wire ring.

[0006] Preferably, the rubber element comprises a main body section and a base section located at the bottom of the main body section, the outer wall of the base section is inwardly tapered from top to bottom, and the inner wall of the main body section is outwardly expanded 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 section comprises a first structure section and a second structure section, the second structure section is connected with the base section, the inner walls of the first structure section and the second structure section are both inclined surfaces, the inclination of the inner wall of the first structure section is greater than that of the second structure section, and the reinforcing wire ring covers the outer wall of the first structure section and part of the outer wall of the second structure section.

[0008] Preferably, the outer wall of the second structural section is a cylindrical surface extending along the axial direction of the rubber member, the outer wall of the first structural section comprises a first stepped surface and a second stepped surface forming a stepped structure, the outer diameter of the first stepped surface is larger than that of the second stepped surface, the second stepped surface is smoothly connected with the outer wall of the second structural section, the reinforcing wire ring covers the outer wall of the second structural section and the second stepped surface, and the outer wall of the reinforcing wire ring is smoothly connected with the first stepped surface.

[0009] Preferably, the second stepped surface is an arc surface protruding away from the center line of the rubber member.

[0010] Preferably, the reinforcing wire ring is provided with at least two layers, and each layer of the reinforcing wire ring is arranged in a stacked and wound manner.

[0011] Preferably, the reinforcing wire ring and the metal framework are sequentially distributed along the axial direction of the rubber member, the bottom end of the reinforcing wire ring and the top end of the second part are provided with mutually matched assembly steps, and the reinforcing wire ring and the second part are fixedly connected through the assembly steps.

[0012] Preferably, an annular table is arranged 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 table is a rectangular structure.

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

[0014] Compared with the prior art, the rubber cup sealing element for the self-sealing packer has the beneficial effects that: the reinforcing wire ring is covered on the outer wall of the rubber member, and the reinforcing wire ring and the first part of the metal framework are fixedly connected through the second part, the metal framework plays a role in supporting the reinforcing wire ring, so that the reinforcing wire ring as the main body supporting the rubber member can improve the anti-deformation ability of the rubber member when bearing working pressure, the entire rubber member can be uniformly stressed when bearing working pressure, meanwhile, the reinforcing wire ring has good elasticity, the reinforcing wire ring covering the outer wall of the rubber member can form a whole-circle gap-free protection, as an exposed part, reduces the friction between the rubber member and the casing, ensures that the sealing element can bear high pressure, the rubber member will not be squeezed into the gap between the casings, ensures that the sealing element is not damaged, and improves the service life of the sealing element. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structural schematic view of the rubber cup sealing element for the self-sealing packer of the present application;

[0016] Figure 2 is Figure 1 a structural schematic view of the metal framework and the reinforcing wire ring of the rubber cup sealing element for the self-sealing packer of the present application;

[0017] Figure 3 is Figure 1 a structural schematic diagram of a metal framework of a rubber cup sealing element for a self-sealing packer;

[0018] Figure 4 is Figure 1 a structural schematic diagram of a rubber cup sealing element for a self-sealing packer after omitting a reinforcing wire ring;

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

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

[0021] The specific embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application, but are not used to limit the scope of the present application.

[0022] A preferred embodiment of a rubber cup sealing element for a self-sealing packer of the present application, as shown in Figures 1 to 5 the rubber cup sealing element for a self-sealing packer includes a rubber element 1, a metal framework 2, and a reinforcing wire ring 3. The rubber element 1 is the sealing structure of the rubber cup sealing element for a self-sealing packer. The metal framework 2 and the reinforcing wire ring 3 are used to strengthen and protect the rubber element 1, and their combination improves the pressure-bearing capacity and extrusion resistance of the sealing element.

[0023] The main body material of the rubber element 1 is high-elasticity rubber. The metal framework 2 plays a role in supporting and fixing the reinforcing wire ring 3 and the rubber element 1. In this embodiment, the material of the metal framework 2 is an alloy material. The metal framework 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 element 1, and the second part 22 is embedded in the rubber element 1. The first part 21 and the second part 22 are integrally formed. The first part 21 is arranged on the inner wall of the rubber element 1, which plays a role in supporting and resisting pressure of the rubber element 1.

[0024] The reinforcing wire ring 3 is arranged on the outer wall of the rubber element 1. The reinforcing wire ring 3 plays a role in supporting the rubber element 1 to prevent excessive deformation and extrusion. The reinforcing wire ring 3 has superior softness and good resilience, can form a whole-circle gap-free protection, can comprehensively prevent rubber extrusion, and as an exposed part, reduces the friction between the rubber element 1 and the casing 5, so that the sealing element is not damaged and the service life is improved.

[0025] The second part 22 of the metal skeleton 2 is connected between the first part 21 and the reinforcing wire ring 3, and 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, and the service life of the rubber part 1 is increased by the combination of the metal skeleton 2 and the metal wire ring.

[0026] In use, the outer diameter of the rubber part 1 of the sealing element is assembled with the inner diameter of the sleeve 5 in an interference fit, and after pressure enters the sleeve 5, the sealing element relies on the interference amount to seal the sleeve 5. When pressure acts on the sealing element, the rubber part 1 begins to deform, at which time the reinforcing wire ring 3 radially supports the sealing element to prevent excessive deformation and extrusion, and the reinforcing wire ring 3 as an exposed part reduces the friction between the rubber part 1 and the sleeve 5, thereby improving the service life of the sealing element.

[0027] The rubber cup sealing element for the self-sealing packer is provided with the reinforcing wire ring 3 wrapped on the outer wall of the rubber part 1, and the reinforcing wire ring 3 is fixedly connected with the first part 21 of the metal skeleton 2 through the second part 22. The metal skeleton 2 plays a supporting role on the reinforcing wire ring 3, so that the reinforcing wire ring 3 serves as the main body supporting the rubber part 1, and the anti-deformation ability of the rubber part 1 under working pressure is improved. The entire rubber part 1 is uniformly stressed under working pressure, and the reinforcing wire ring 3 has good elasticity. The reinforcing wire ring 3 wraps the outer wall of the rubber part 1 to form a whole-circle gap-free protection, and as an exposed part, reduces the friction between the rubber part 1 and the sleeve 5, ensures that the sealing element can withstand high pressure, and the rubber part 1 will not extrude into the gap between the sleeve 5, ensuring that the sealing element is not damaged.

[0028] Preferably, the rubber part 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 is inwardly tapered from the top to the bottom, and the inner wall of the main body section 11 is outwardly expanded from the bottom to the 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.

[0029] The main body section 11 and the base section 12 of the rubber part 1 are sequentially distributed along the axial direction. The outer wall of the base section 12 is tapered inwardly from the top to the bottom, facilitating the sealing element to enter the sleeve 5 and seal the sleeve 5. The inner wall of the main body section 11 is expanded outwardly from the bottom to the top, forming an open structure for the pressure to act on the inner wall of the rubber part 1 from the top to the bottom, facilitating the axial compression and radial deformation of the rubber part 1, and increasing the sealing effect.

[0030] The main body section 11 is the main structure of the rubber part 1 in contact with the sleeve 5 during deformation sealing. Arranging the reinforcing wire ring 3 on the main body section 11 can better increase the support and anti-extrusion effect of the reinforcing wire ring 3 on the rubber part 1. Meanwhile, arranging the metal skeleton 2 on the base section 12 can support and fix the reinforcing wire ring 3 in the axial direction, thereby increasing the service life of the rubber part 1.

[0031] Preferably, the main body section 11 comprises a first structure section 111 and a second structure section 112, the second structure section 112 is connected with the base section 12, the inner wall of the first structure section 111 and the second structure section 112 are both inclined surfaces, the inclination of the inner wall of the first structure section 111 is greater than the inclination of the inner wall of the second structure section 112, the reinforcing wire coil 3 covers the outer wall of the first structure section 111, and the reinforcing wire coil 3 covers part of the outer wall of the second structure section 112.

[0032] The inclination of the inner wall of the first structure section 111 is greater than the inclination of the inner wall of the second structure section 112, and the first structure section 111 is located at the top of the second structure section 112. When subjected to pressure, the first structure section 111 mainly plays a role in axially compressing the rubber part 1, and the second structure section 112 mainly plays a role in radially expanding and deforming to seal the sleeve 5. The reinforcing wire coil 3 is covered on the outer wall of the first structure section 111 and part of the outer wall of the second structure section 112, which fully covers the radial deformation sealing part of the sealing part, has high utilization rate of the reinforcing wire coil 3, and prevents the sealing part from being excessively deformed and extruded.

[0033] Preferably, the outer wall of the second structure section 112 is a cylindrical surface extending along the axial direction of the rubber part 1, the outer wall of the first structure section 111 comprises a first stepped surface 13 and a second stepped surface 14 forming a stepped structure, the outer diameter of the first stepped surface 13 is greater than the outer diameter of the second stepped surface 14, the second stepped surface 14 is smoothly connected with the outer wall of the second structure section 112, the reinforcing wire coil 3 covers the outer wall of the second structure section 112 and the second stepped surface 14, and the outer wall of the reinforcing wire coil 3 is smoothly connected with the first stepped surface 13.

[0034] The outer wall of the first structure section 111 forms a stepped structure with the first stepped surface 13 and the second stepped surface 14, and a space for arranging the reinforcing wire coil 3 is formed between the stepped structures, so that the reinforcing wire coil 3 and the first stepped surface 13 are smoothly connected, and the outer wall of the second structure section 112 and the second stepped surface 14 are smoothly connected, thereby reducing the abrupt structure on the rubber part 1 and improving the service life of the rubber part 1.

[0035] Preferably, the second stepped surface 14 is an arc surface protruding away from the center line of the rubber part 1.

[0036] The second stepped surface 14 is an arc surface, which can increase the contact area between the second stepped surface 14 and the inner wall of the sleeve 5 when the sealing part is deformed under pressure, thereby increasing the sealing effect.

[0037] Preferably, the reinforcing wire coil 3 is provided with at least two layers, and each layer of the reinforcing wire coil 3 is arranged by stacking and winding.

[0038] When the rubber part 1 is deformed under pressure, the reinforcing wire ring 3 is deformed synchronously and contacts the sleeve 5, reducing the friction between the rubber part 1 and the sleeve 5, and when the pressure is removed, the rubber part 1 is recovered, and the reinforcing wire ring 3 can be contracted synchronously, protecting the rubber part 1.

[0039] The reinforcing wire ring 3 is provided with at least two layers, and after the layers of reinforcing wire ring are stacked and wound, the rubber part 1 is formed to have a whole-circle gapless protection, which can comprehensively prevent rubber extrusion and avoid damage to the rubber.

[0040] Preferably, the reinforcing wire ring 3 and the metal framework 2 are sequentially distributed along the axial direction of the rubber part 1, the bottom end of the reinforcing wire ring 3 and the top end of the second part 22 are provided with mutually matched assembly steps 4, and the reinforcing wire ring 3 and the second part 22 are fixedly connected through the assembly steps 4.

[0041] The bottom end of the reinforcing wire ring 3 and the bottom end of the second part 22 of the metal framework 2 are fixedly connected through the assembly steps 4, and the assembly steps 4 enable the metal framework 2 to have axial and radial support force on the reinforcing wire ring 3, so that the reinforcing wire ring 3 and the metal framework 2 are more stable after being formed as a whole.

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

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

[0044] In summary, the embodiment of the present application provides a rubber cup sealing element for a self-sealing packer, the rubber part of which is coated with a reinforcing wire ring, and the reinforcing wire ring and the first part of the metal framework are fixedly connected through the second part, the metal framework plays a role in supporting the reinforcing wire ring, so that the reinforcing wire ring serves as the main body supporting the rubber part, can improve the anti-deformation ability of the rubber part under working pressure, the whole rubber part can be uniformly stressed under working pressure, the reinforcing wire ring has good elasticity, the reinforcing wire ring coated on the outer wall of the rubber part can form a whole-circle gapless protection, as an exposed part, reduces the friction between the rubber part and the sleeve, ensures that the sealing element can withstand high pressure, the rubber part cannot be extruded into the gap between the sleeves, ensures that the sealing element is not damaged, and improves the service life of the sealing element.

[0045] The above merely describes the preferred embodiments of the present application, and it should be pointed out that, for those skilled in the art, several improvements and replacements can be made without departing from the technical principles of the present application, and these improvements and replacements should also be considered as the protection scope of the present application.

Claims

1. A cup seal for a self-sealing packer, characterized by, The rubber part (1), the metal framework (2) and the reinforcing wire ring (3), the metal framework (2) includes a first part (21) fixedly arranged on the inner wall of the rubber part (1) and a second part (22) embedded in the rubber part (1), the reinforcing wire ring (3) is arranged on the outer wall of the rubber part (1), the second part (22) is connected between the first part (21) and the reinforcing wire ring (3), 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) is inwardly tapered from top to bottom, the inner wall of the main body section (11) is outwardly expanded from bottom to top, the reinforcing wire ring (3) is arranged on the main body section (11), the metal framework (2) is arranged on the base section (12), the main body section (11) includes a first structure section (111) and a second structure section (112), the second structure section (112) is connected with the base section (12), the inner walls of the first structure section (111) and the second structure section (112) are both inclined surfaces, the inclination of the inner wall of the first structure section (111) is greater than that of the second structure section (112), the reinforcing wire ring (3) covers the outer wall of the first structure section (111) and part of the outer wall of the second structure section (112).

2. The cup seal for a self-sealing packer of claim 1, wherein, The outer wall of the second structure section (112) is a cylindrical surface extending along the axial direction of the rubber part (1), the outer wall of the first structure section (111) includes a first stepped surface (13) and a second stepped surface (14) forming a stepped structure, the outer diameter of the first stepped surface (13) is greater than that of the second stepped surface (14), the second stepped surface (14) is smoothly connected with the outer wall of the second structure section (112), the reinforcing wire ring (3) covers the outer wall of the second structure section (112) and the second stepped surface (14), the outer wall of the reinforcing wire ring (3) is smoothly connected with the first stepped surface (13).

3. The cup seal for a self-sealing packer of claim 2, wherein, The second stepped surface (14) is an arc surface protruding away from the center line of the rubber part (1).

4. The cup seal for a self-sealing packer of any one of claims 1-3, wherein, The reinforcing wire ring (3) is provided with at least two layers, and each layer of the reinforcing wire ring (3) is arranged in a stacked and wound manner.

5. A cup seal for a self-sealing packer according to any one of claims 1-3, wherein, The reinforcing wire ring (3) and the metal framework (2) are sequentially distributed along the axial direction of the rubber part (1), the bottom end of the reinforcing wire ring (3) and the top end of the second part (22) are provided with mutually matched assembly steps (4), and the reinforcing wire ring (3) and the second part (22) are fixedly connected through the assembly steps (4).

6. The cup seal for a self-sealing packer of claim 5, wherein, An annular table (23) is arranged 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 table (23) is in a rectangular structure.

7. A cup seal for a self-sealing packer according to any one of claims 1-3, wherein, The reinforcing wire ring (3) is a metal part or a high-strength fiber woven part.

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