A rubber core for long-life annular blowout preventer

Abstract

The utility model relates to the technical field of blowout preventer, disclose a long life rubber core for annular blowout preventer, include: elastic core seat, for annular, its outside wall is equipped with a plurality of auxiliary rebound groove, bottom surface is equipped with a plurality of annular rebound convex strip, prevent the muscle, fixedly arranged on the elastic core seat top, and around the elastic core seat center is equidistantly equipped with a plurality of, auxiliary rebound spare, embed in each auxiliary rebound groove, fixed by the elastic hoop ring of sleeve joint arranged on the outside of elastic core seat, the utility model has the advantages of: the structure of additional auxiliary rebound, delays rubber core deformation and breakage time.

Description

Technical Field

[0001] This utility model relates to the field of blowout preventer technology, specifically to a rubber core for a long-life annular blowout preventer. Background Technology

[0002] The annular blowout preventer (BOP) core is the core sealing component of the annular BOP used in oil drilling. It is typically made of oil-resistant, wear-resistant, and high / low temperature-resistant rubber material, and has a ring-shaped structure. Its main function is to hydraulically deform the core during drilling in the event of a blowout, achieving a rapid seal on the drill string, casing, or dead shaft to prevent high-pressure oil and gas from ejecting. The core design must be adaptable to drill strings of different sizes, possess good elasticity and fatigue resistance, and be reusable multiple times. Common types include conical and spherical types.

[0003] While current annular blowout preventer (BOP) cores are designed with resilience in mind, enabling rapid repositioning and maintaining a good seal during short-term sealing operations, their rubber molecular chains are prone to gradual aging and breakage after prolonged exposure to high-frequency hydraulic pressure and release. This leads to a decrease in the toughness of the elastic fibers and consequently, insufficient elasticity. Especially in high-temperature, high-pressure drilling environments, continuous contact with corrosive media in drilling fluid accelerates the deterioration of the core material, resulting not only in reduced sealing fit but also increased susceptibility to localized deformation due to stress concentration. If not replaced promptly, repeated pressure exposure can lead to tearing, chipping, and other damage. Utility Model Content

[0004] To solve the above-mentioned problems, this utility model proposes a long-life annular blowout preventer core with an auxiliary rebound structure that delays the deformation and breakage time of the core.

[0005] To solve the above-mentioned technical problems, the technical solution proposed by this utility model is: a rubber core for a long-life annular blowout preventer, comprising:

[0006] The elastic core seat is annular, with several auxiliary spring grooves on its outer wall and several annular spring protrusions on its bottom surface.

[0007] Anti-spray ribs are fixedly installed above the elastic core seat, and are arranged in a radiating pattern at equal intervals around the center of the elastic core seat;

[0008] The auxiliary spring-loaded components are embedded in each auxiliary spring-loaded groove and fixed by an elastic hoop sleeved on the outside of the elastic core seat.

[0009] Furthermore, the upper wall of the elastic core seat is an inclined surface with the inner side higher than the outer side.

[0010] Furthermore, the auxiliary rebound grooves are equidistantly distributed along the outer wall of the elastic core seat.

[0011] Furthermore, the anti-spray ribs can converge towards the center of the elastic core seat and fit tightly against each other.

[0012] Furthermore, the auxiliary rebound component is a hard rubber strip.

[0013] Furthermore, several elastic hoop rings are evenly distributed vertically, and an annular groove matching the elastic hoop rings is provided on the outer wall of the elastic core seat.

[0014] Compared with existing technologies, the advantages of this invention are as follows: the auxiliary rebound groove on the outer side of the elastic core seat, combined with the embedded hard rubber strip, forms evenly distributed rebound support points. This utilizes the elasticity of the rubber strip to aid in repositioning while also using its hardness to distribute the pressure borne by the core seat, preventing excessive local deformation. The annular rebound protrusion at the bottom further enhances the overall elastic potential energy, allowing the core seat to recover its original shape more quickly after repeated compression. The elastic hoop sleeved on the outer side fixes the auxiliary rebound component at multiple positions, preventing displacement during high-frequency operations and ensuring the continuous and stable function of the rebound structure. These designs make the rebound of the rubber core more stable and thorough after each blowout prevention operation, reducing plastic deformation and stress concentration caused by insufficient rebound during long-term use, thereby significantly extending the service life of the rubber core. Attached Figure Description

[0015] Figure 1 This is a three-dimensional representation of the present invention. Figure 1 ;

[0016] Figure 2 This is a three-dimensional representation of the present invention. Figure 2 ;

[0017] Figure 3 This is the front view of this utility model;

[0018] Figure 4 This is a top view of the present invention.

[0019] As shown in the figure: 1. Elastic core seat; 2. Annular rebound rib; 3. Anti-spray rib; 4. Auxiliary rebound component; 5. Elastic hoop ring. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings.

[0021] Combined with appendix Figure 1 Appendix Figure 3 A long-life annular blowout preventer core includes: an elastic core seat 1, which is annular, and the upper wall of the elastic core seat 1 is an inclined surface with the inner side higher than the outer side, which can guide the blowout preventer ribs 3 to converge more smoothly towards the center, improve the fit during sealing, and enhance the blowout preventer effect.

[0022] Combined with appendix Figure 2 Appendix Figure 4The outer wall of the elastic core seat 1 is provided with several auxiliary rebound grooves, and the bottom surface is provided with several annular rebound protrusions 2. The auxiliary rebound grooves are equidistantly distributed along the outer wall of the elastic core seat 1, which can make the auxiliary rebound component 4 uniformly stressed, make the elastic core seat 1 rebound more smoothly, and extend its service life.

[0023] Combined with appendix Figure 1 Appendix Figure 4 The anti-blowout ribs 3 are fixedly installed above the elastic core seat 1 and are arranged in a radiating pattern at equal intervals around the center of the elastic core seat 1. The anti-blowout ribs 3 can converge towards the center of the elastic core seat 1 and fit tightly together to ensure that a gapless seal is formed during anti-blowout operation, effectively preventing fluid leakage and improving the reliability of the seal.

[0024] Combined with appendix Figure 2 Appendix Figure 3 The auxiliary rebound component 4 is embedded in each auxiliary rebound groove. The auxiliary rebound component 4 is a hard rubber strip, which has both a certain elasticity to assist the rebound and sufficient hardness to support the elastic core seat 1, thereby enhancing the rebound performance.

[0025] Combined with appendix Figure 1 Appendix Figure 3 The auxiliary rebound component 4 is fixed by an elastic hoop 5 sleeved on the outside of the elastic core seat 1. Several elastic hoop 5 are evenly distributed vertically, and the outer wall of the elastic core seat 1 is provided with an annular groove matching the elastic hoop 5, which can evenly fix the auxiliary rebound component 4 from multiple positions, ensuring a stable fixation and preventing its displacement from affecting the rebound effect.

[0026] The specific implementation of this utility model is as follows: When the blowout preventer operation is initiated, external pressure forces the elastic core seat 1 to deform. The inclined upper wall surface, with its higher inner side and lower outer side, guides the blowout preventer ribs 3 to converge towards the center. Multiple blowout preventer ribs 3, distributed in a divergent pattern, fit tightly together, quickly forming a gapless seal to block fluid leakage. At this time, the auxiliary rebound member 4 in the auxiliary rebound groove on the outer wall of the elastic core seat 1 is simultaneously compressed, cooperating with the annular rebound protrusion 2 on the bottom surface to store elastic potential energy. After the operation is completed, the auxiliary rebound member 4 releases its elastic force, and under the fixing action of the elastic hoop 5, it evenly pushes the elastic core seat 1 back to its original position. The annular rebound protrusion 2 enhances the overall rebound force, ensuring that the blowout preventer ribs 3 disperse smoothly. The elastic hoop 5 fixes the auxiliary rebound member 4 through the annular hoop groove, preventing it from shifting during repeated deformation, ensuring that the core can accurately return to its initial state after each operation, maintaining long-term sealing reliability.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly, for example, it can be a fixed connection, a detachable connection, or an integral connection; for those skilled in the art, the specific meaning of the above term in this utility model can be understood according to the specific circumstances.

[0028] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A rubber core for a long-life annular blowout preventer, characterized in that, include: The elastic core seat (1) is annular, with several auxiliary spring grooves on its outer side wall and several annular spring protrusions (2) on its bottom surface; Anti-spray ribs (3) are fixedly installed above the elastic core seat (1) and are arranged in a radiating pattern at equal intervals around the center of the elastic core seat (1); The auxiliary spring-loaded component (4) is embedded in each auxiliary spring-loaded groove and fixed by the elastic hoop (5) sleeved on the outside of the elastic core seat (1).

2. The rubber core for a long-life annular blowout preventer according to claim 1, characterized in that: The upper wall of the elastic core seat (1) is an inclined surface with the inner side higher than the outer side.

3. The rubber core for a long-life annular blowout preventer according to claim 1, characterized in that: The auxiliary rebound grooves are distributed at equal intervals along the outer side wall of the elastic core seat (1).

4. The rubber core for a long-life annular blowout preventer according to claim 1, characterized in that: The anti-spray ribs (3) can converge toward the center of the elastic core seat (1) and fit tightly together.

5. The rubber core for a long-life annular blowout preventer according to claim 1, characterized in that: The auxiliary rebound component (4) is a hard rubber strip.

6. The rubber core for a long-life annular blowout preventer according to claim 1, characterized in that: The elastic hoop (5) is distributed at equal intervals in the upper and lower parts, and the outer wall of the elastic core seat (1) is provided with an annular groove matching the elastic hoop (5).

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