Reinforced rubber core of rotary blowout preventer

Abstract

The utility model discloses a reinforced rubber core of a rotary blowout preventer, which belongs to the technical field of petroleum and natural gas drilling equipment and comprises a rubber core main body and a self-lubricating bushing detachably arranged in the rubber core main body. Annular sealing bulges are arranged at the top end and the bottom end of the rubber core main body, a plurality of reinforcing ribs are arranged in the rubber core main body, a first reinforcing layer, a second reinforcing layer and a third reinforcing layer are sequentially arranged on the outer surface of the rubber core main body from top to bottom, and a heat conduction buffer layer is arranged on the inner side of the third reinforcing layer. According to the reinforced rubber core of the rotary blowout preventer, through material compounding and structure optimization, the wear-resisting life of the rubber core is effectively prolonged, safe and efficient operation of drilling operation is achieved, and the reinforced rubber core is suitable for high-temperature, high-pressure and high-corrosion complex drilling environments.

Description

Technical Field

[0001] This utility model belongs to the technical field of oil and gas drilling equipment, specifically relating to a reinforced rubber core for a rotary blowout preventer. Background Technology

[0002] In oil and gas drilling operations, rotary blowout preventers (BOFs) are critical equipment used to control wellhead pressure and prevent blowouts. The rubber core, as the core sealing component of the rotary BOP, directly affects the sealing effect and operational reliability of the entire BOP. Existing rotary BOP rubber cores, during long-term use, are prone to wear, aging, and sealing failure due to factors such as high pressure, high-speed rotation, and scouring from solid particles in the drilling fluid. This leads to decreased wellhead sealing performance, increased blowout risk, and the need for frequent core replacement, impacting drilling efficiency and increasing operating costs. Utility Model Content

[0003] The purpose of this invention is to provide a reinforced rubber core for a rotary blowout preventer, in order to solve the problems of easy wear, aging, and sealing failure of existing rubber cores mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a rotating blowout preventer reinforcing core, comprising a core body and a self-lubricating bushing detachably disposed within the core body. The core body has a frustum-shaped structure with a central through hole inside. The inner wall of the self-lubricating bushing is machined with a spiral guide groove. The top and bottom ends of the core body are provided with annular sealing protrusions. The core body is provided with multiple reinforcing ribs. The outer surface of the core body is provided with a first reinforcing layer, a second reinforcing layer, and a third reinforcing layer from top to bottom. The inner side of the third reinforcing layer is provided with a thermally conductive buffer layer.

[0005] In a further embodiment, the reinforcing rib adopts a gradient density fiber reinforcement structure, with an inner glass fiber reinforcement layer and an outer carbon fiber reinforcement layer, and the two layers are connected by a resin-based material composite.

[0006] In a further embodiment, the first reinforcing layer is an aramid fiber braided layer, the second reinforcing layer is a steel wire cord layer, and the third reinforcing layer is a wear-resistant rubber layer.

[0007] In a further embodiment, the thermally conductive buffer layer is made of graphene-modified rubber material, with hollow glass microspheres uniformly distributed inside.

[0008] In a further embodiment, the outer surface of the sealing protrusion is provided with anti-slip texture, and the inner side of the sealing protrusion is provided with a nano-ceramic anti-corrosion coating.

[0009] The technical effects and advantages of this utility model are as follows:

[0010] This rotary blowout preventer reinforced rubber core, by setting multiple reinforcing layers of different materials on the outer surface of the rubber core body, can effectively improve the wear resistance, tensile strength and sealing performance of the rubber core body, and extend the service life of the rubber core body;

[0011] By setting reinforcing ribs inside the rubber core body, the overall strength and deformation resistance of the rubber core body can be improved, enabling it to maintain a stable structure under high pressure.

[0012] By setting annular sealing protrusions and anti-slip textures at the top and bottom of the rubber core body, the sealing effect and friction between the rubber core body and the rotary blowout preventer housing can be increased, preventing the rubber core body from sliding and leaking, and improving the working reliability and safety of the rotary blowout preventer. This rotary blowout preventer strengthens the rubber core, and through material composite and structural optimization, the wear life of the rubber core is effectively improved, realizing safe and efficient operation of drilling operations, and is suitable for complex drilling environments with high temperature, high pressure and high corrosion. Attached Figure Description

[0013] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a cross-sectional view of the third reinforcing layer of this utility model;

[0016] Figure 3 This is a schematic diagram of the structure of the adhesive core body of this utility model in a cut-out state.

[0017] In the diagram: 1. Core body; 2. Self-lubricating bushing; 3. Sealing protrusion; 4. Reinforcing rib; 5. First reinforcing layer; 6. Second reinforcing layer; 7. Third reinforcing layer; 8. Thermally conductive buffer layer. Detailed Implementation

[0018] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0019] Unless otherwise defined, the directions mentioned herein, such as up, down, left, right, front, back, inside, and outside, are based on the directions shown in the figures of this utility model, and are explained here together.

[0020] This utility model provides, for example Figure 1-3 The illustration shows a rotating blowout preventer (BOP) reinforced core, comprising a core body 1 and a self-lubricating bushing 2 detachably disposed within the core body 1. The core body 1 has a frustum-shaped structure with a central through-hole for drill pipe and other equipment to pass through. The self-lubricating bushing 2 is installed in the central through-hole of the core body 1. The self-lubricating bushing 2 is made of a composite woven material of polytetrafluoroethylene fiber and molybdenum disulfide. The inner wall of the self-lubricating bushing 2 is machined with spiral guide grooves, 1-2 mm deep and 3-5 mm wide, for guiding drilling fluid to form a lubricating film. Both the top and bottom ends of the core body 1 are provided with annular sealing protrusions 3. The outer surface of the sealing protrusions 3 has anti-slip textures to increase the friction between the sealing protrusions 3 and the rotating BOP housing, improving the sealing effect and preventing the core body 1 from sliding during operation. The inner side of the sealing protrusions 3 is coated with a nano-ceramic anti-corrosion coating, achieving dual reinforcement of thermal conductivity, heat insulation, and corrosion resistance. The core body 1 contains multiple reinforcing ribs 4, which are reinforced with gradient density fibers. The structure consists of an inner glass fiber reinforcement layer, which provides basic support for the core body 1 near its inner wall, effectively dispersing internal stress and enhancing its resistance to internal pressure. The outer carbon fiber reinforcement layer, known for its high strength and high modulus, allows the reinforcing rib 4 to withstand higher external loads near the outer wall of the core body 1. For example, in high-pressure drilling environments, the outer wall of the core body 1 is subjected to complex external forces such as drilling fluid pressure and friction generated by drill pipe rotation. The carbon fiber reinforcement layer can greatly improve the load-bearing capacity of the reinforcing rib 4 under harsh working conditions, ensuring the structural integrity of the core body 1. The two layers are connected by a resin-based composite material. The reinforcing rib 4 has an arc-shaped structure, and its curvature matches the curvature of the outer surface of the core body 1, which can better adapt to the shape of the core body 1 and improve the overall strength and deformation resistance of the core body 1.

[0021] The outer surface of the core body 1 is provided with a first reinforcing layer 5, a second reinforcing layer 6, and a third reinforcing layer 7 from top to bottom. A thermally conductive buffer layer 8 is provided inside the third reinforcing layer 7. The first reinforcing layer 5 is an aramid fiber braided layer. Aramid fibers have high strength, high temperature resistance, and wear resistance, which can improve the tensile strength and wear resistance of the top of the core body 1. The second reinforcing layer 6 is a steel wire cord layer. Steel wire cord has good tensile strength and rigidity, which can improve the structural strength and deformation resistance of the middle part of the core body 1. The third reinforcing layer 7 is a wear-resistant rubber layer. Wear-resistant rubber has good wear resistance and elasticity, which can improve the wear resistance and sealing performance of the bottom of the core body 1. The thermally conductive buffer layer 8 is made of graphene-modified rubber material, with hollow glass microspheres evenly distributed inside to form a thermal insulation buffer structure and extend the service life of the core body 1.

[0022] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The control method of this utility model is through a controller. The control circuit of the controller can be implemented by those skilled in the art through simple programming. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0023] In the description of this utility model, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0024] Working principle:

[0025] The rotating blowout preventer has a reinforced rubber core. During operation, the rubber core body 1 has a frustum-shaped structure and expands radially under the pressure at the wellhead. It fits tightly with the rotating blowout preventer housing through the annular sealing protrusions 3 at the top and bottom. The anti-slip texture on the outer surface of the sealing protrusions 3 increases friction and prevents the rubber core from sliding. The nano-ceramic anti-corrosion coating on the inner side resists drilling fluid corrosion. The spiral guide groove on the inner wall of the removable self-lubricating bushing 2 in the central through hole guides the drilling fluid to form a lubricating film, reducing frictional loss when the drill pipe rotates.

[0026] The outer surface of the rubber core body 1 features a three-tiered reinforcement structure consisting of an aramid fiber braided layer (first reinforcing layer 5), a steel wire cord layer (second reinforcing layer 6), and a wear-resistant rubber layer (third reinforcing layer 7). This structure enhances the tensile strength at the top, the rigidity in the middle, and the wear resistance at the bottom, respectively. The graphene-modified rubber thermally conductive buffer layer 8 inside the third reinforcing layer 7, combined with hollow glass microspheres, rapidly dissipates frictional heat and blocks external high temperatures, delaying rubber aging. The internal gradient density fiber-reinforced reinforcing ribs 4 disperse internal stress with inner glass fiber and resist external high pressure with outer carbon fiber. Resin-based composite bonding enhances interlayer strength. The arc-shaped structure conforms to the curvature of the rubber core body 1, evenly distributing the load and improving the overall resistance to deformation. This ensures that the rubber core maintains a stable seal under high pressure, high-speed rotation, and drilling fluid scouring conditions, extending its wear life and ensuring safe and efficient drilling operations.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rotating blowout preventer reinforcing rubber core, comprising a core body (1) and a self-lubricating bushing (2) detachably disposed within the core body (1), characterized in that: The core body (1) is a frustum-shaped structure with a central through hole inside. The inner wall of the self-lubricating bushing (2) is machined with a spiral guide groove. The top and bottom ends of the core body (1) are provided with annular sealing protrusions (3). The core body (1) is provided with multiple reinforcing ribs (4). The outer surface of the core body (1) is provided with a first reinforcing layer (5), a second reinforcing layer (6) and a third reinforcing layer (7) from top to bottom. The inner side of the third reinforcing layer (7) is provided with a thermally conductive buffer layer (8).

2. The rotating blowout preventer reinforcing core according to claim 1, characterized in that: The reinforcing rib (4) adopts a gradient density fiber reinforcement structure, with an inner glass fiber reinforcement layer and an outer carbon fiber reinforcement layer, and the two layers are connected by a resin-based material composite.

3. The rotating blowout preventer reinforcing core according to claim 1, characterized in that: The first reinforcing layer (5) is an aramid fiber braided layer, the second reinforcing layer (6) is a steel wire cord layer, and the third reinforcing layer (7) is a wear-resistant rubber layer.

4. The rotating blowout preventer reinforcing core according to claim 1, characterized in that: The thermally conductive buffer layer (8) is made of graphene-modified rubber material, with hollow glass microspheres uniformly distributed inside.

5. The rotating blowout preventer reinforcing core according to claim 1, characterized in that: The outer surface of the sealing protrusion (3) is provided with anti-slip texture, and the inner side of the sealing protrusion (3) is provided with a nano-ceramic anti-corrosion coating.

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