A blowout preventer for wellheads

Abstract

The utility model relates to a blowout preventer for well mouth belongs to petroleum exploitation equipment technical field, including casing, piston, conical rubber core, upper pressure seal oil cavity, lower pressure loose oil cavity, upper pressure oil plug and lower pressure oil plug, the casing top is equipped with the cover plate of compacting conical rubber core, the piston inner hole is equipped with the support cylinder, the lower part inner hole of support cylinder is equipped with the embedded recess, the embedded recess is equipped with the centralizing copper bush, the lower part inner hole outside of casing is equipped with the support recess of locating support cylinder and centralizing copper bush bottom, the inner wall of support cylinder is equipped with cooling liquid cavity, the lower part outside wall of casing is equipped with cooling liquid inlet plug and cooling liquid outlet plug, and the inner end of cooling liquid inlet plug and cooling liquid outlet plug all are screwed in the mounting hole of support cylinder and communicate cooling liquid cavity. The utility model discloses centralizing copper bush can support and right the oil rod in the lower part, prevent deflection, can take away the heat generated when blowout preventer works in time, guarantees equipment to work under the suitable temperature, improves the performance stability.

Description

Technical Field

[0001] This utility model belongs to the technical field of oil extraction equipment, specifically relating to a blowout preventer for wellheads. Background Technology

[0002] In oil drilling operations, the annular blowout preventer (BOP) is a key piece of equipment for ensuring wellhead safety and sealing the annular space. Traditional annular BOPs have certain shortcomings. On the one hand, during drilling, the movement of components such as the oil rod is prone to deviation, affecting the sealing effect and lifespan of the BOP. On the other hand, the BOP generates heat during operation due to the compression of the rubber core and the operation of the hydraulic control system. The existing structure has poor heat dissipation, and long-term accumulation may affect the performance of components and the stability of the equipment. Utility Model Content

[0003] Therefore, it is necessary to provide a blowout preventer for wellheads to address the existing technical problems.

[0004] To solve the problems of the existing technology, the technical solution adopted by this utility model is as follows:

[0005] A blowout preventer for wellheads includes a housing, a piston inside the housing, a conical rubber core in the upper conical bore of the piston, forming an upper pressure sealing oil chamber and a lower pressure releasing oil chamber between the piston and the housing, with an upper pressure plug and a lower pressure plug respectively connected to the upper pressure sealing oil chamber and the lower pressure releasing oil chamber, a cover plate on the top of the housing for pressing the conical rubber core, a support cylinder in the inner bore of the piston, an embedding groove in the lower inner bore of the support cylinder, a straightening copper sleeve in the embedding groove, a positioning support cylinder and a support recess at the bottom of the straightening copper sleeve on the outer side of the lower inner bore of the housing, a coolant chamber in the inner wall of the support cylinder, and a coolant inlet plug and a coolant outlet plug on the lower outer wall of the housing, the inner ends of the coolant inlet plug and the coolant outlet plug being threaded into the mounting hole of the support cylinder and communicating with the coolant chamber.

[0006] As a preferred embodiment, the bottom of the support cylinder is provided with a positioning protrusion, and the support recess is provided with a positioning hole that mates with the positioning protrusion, so that the mounting hole on the support cylinder can be quickly aligned with the coolant inlet plug and the coolant outlet plug.

[0007] As a preferred option, a dust seal is fitted on the upper outer side of the piston, with the outer wall of the dust seal in contact with the inner wall of the housing for better dust prevention and sealing.

[0008] As a preferred embodiment, the top center of the cover plate is provided with a positioning groove, and an upper straightening cylinder is provided in the positioning groove. A straightening rubber sleeve is fixed inside the upper straightening cylinder. Multiple elastic protrusions are evenly provided in the inner hole of the straightening rubber sleeve. A skeleton dustproof ring is fixed on the top of the upper straightening cylinder. The straightening rubber sleeve and elastic protrusions inside the upper straightening cylinder can further flexibly straighten the oil rod at the top, effectively avoiding wear of the conical rubber core caused by the oil rod tilting, improving the sealing performance and service life of the blowout preventer, and the upper straightening cylinder can better dissipate heat.

[0009] As a preferred option, multiple heat dissipation fins are evenly fixed on the outer wall of the upper support cylinder. The heat dissipation fins can increase the heat dissipation area and accelerate heat dissipation.

[0010] As a preferred embodiment, the bottom of the heat dissipation fins is provided with a fixing flange that is fixed to the upper straightening cylinder. The lower part of the fixing flange is fixed to the cover plate by bolts, which facilitates the installation of the upper straightening cylinder.

[0011] As a preferred embodiment, the top of the cover plate is evenly provided with multiple air guide slots, the bottom of which is an arc shape that gradually increases from the outside to the inside. The top of the cover plate is provided with an installation groove for the fixing flange to be inserted. The top of the inner end of the air guide slot is flush with the top of the fixing flange, which is conducive to air circulation and can assist the heat dissipation fins in heat dissipation, further improving heat dissipation efficiency.

[0012] The advantages of this utility model compared with the prior art are:

[0013] The straightening copper sleeve can support and straighten the oil rod from below, preventing it from tilting. The straightening copper sleeve is less hard than the oil rod, so even if it wears unevenly, it will not damage the oil rod. The straightening copper sleeve has better thermal conductivity, which can transfer heat to the support cylinder, and then be carried away by the circulating coolant in the coolant chamber. This timely removal of the heat generated by the blowout preventer during operation ensures that the equipment operates at a suitable temperature and improves performance stability. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the front sectional view of the present invention;

[0015] Figure 2 yes Figure 1 Partial structural diagram;

[0016] Figure 3 yes Figure 2 Enlarged structural diagram at point A;

[0017] The numbers on the map are:

[0018] 1. Housing; 2. Coolant inlet plug; 3. Positioning protrusion; 4. Coolant outlet plug; 5. Straightening copper sleeve; 6. Coolant chamber; 7. Support cylinder; 8. Piston; 9. Conical rubber core; 10. Cover plate; 11. Lower pressure oil plug; 12. Dustproof ring; 13. Upper pressure oil plug; 14. Straightening rubber sleeve; 15. Upper straightening cylinder; 16. Heat dissipation fins; 17. Frame dustproof ring; 18. Elastic protrusion; 19. Air guide groove; 20. Positioning groove; 21. Fixed flange. Detailed Implementation

[0019] To further understand the features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments.

[0020] Example 1, Reference Figures 1 to 3 A blowout preventer for wellheads includes a housing 1, a piston 8 inside the housing 1, a conical rubber core 9 in the upper conical hole of the piston 8, an upper pressure sealing oil chamber and a lower pressure releasing oil chamber formed between the piston 8 and the housing 1, the upper pressure sealing oil chamber and the lower pressure releasing oil chamber are respectively connected to an upper pressure plug 13 and a lower pressure plug 11, a cover plate 10 for pressing the conical rubber core 9 is provided on the top of the housing 1, a support cylinder 7 is provided in the inner hole of the piston 8, an embedding groove is provided in the lower inner hole of the support cylinder 7, a straightening copper sleeve 5 is provided in the embedding groove, a positioning support cylinder 7 and a support recess at the bottom of the straightening copper sleeve 5 are provided on the outer side of the lower inner hole of the housing 1, a coolant chamber 6 is provided in the inner wall of the support cylinder 7, a coolant inlet plug 2 and a coolant outlet plug 4 are provided on the lower outer wall of the housing 1, the inner ends of the coolant inlet plug 2 and the coolant outlet plug 4 are threaded into the mounting hole of the support cylinder 7 and communicate with the coolant chamber 6.

[0021] When this blowout preventer is in operation, if it is necessary to close the wellhead, pressurized oil is introduced into the sealing oil chamber by pressing the upper oil plug 13 upward, pushing the piston 8 upward, which in turn squeezes the conical rubber core 9, causing the conical rubber core 9 to deform and fit tightly against the internal oil rod to seal the annular space of the wellhead; if it is necessary to open the wellhead, pressurized oil is introduced into the oil chamber by pressing the lower oil plug 11 downward, pushing the piston 8 downward, and the conical rubber core 9 returns to its original position under its own elasticity, with its inner hole moving away from the oil rod.

[0022] During the process of the oil rod penetrating the blowout preventer, the lower centering copper sleeve 5 provides centering and support for the oil rod, effectively preventing the oil rod from tilting. The heat generated by the friction of the centering copper sleeve 5 is transferred to the support cylinder 7. During the heat dissipation process, the coolant enters the coolant chamber 6 of the support cylinder 7 from the coolant inlet plug 2, absorbs heat, and then flows out from the coolant outlet plug 4, achieving circulating heat dissipation.

[0023] In Example 2, based on Example 1, the bottom of the support cylinder 7 is provided with a positioning protrusion 3, and the support recess is provided with a positioning hole that mates with the positioning protrusion 3. When the support cylinder 7 is installed, the positioning protrusion 3 at the bottom is inserted into the positioning hole, so that the mounting hole on the support cylinder 7 will be aligned with the threaded hole on the housing 1 for installing the cooling inlet plug 2 and the cooling outlet plug 4, making it convenient for the cooling inlet plug 2 and the cooling outlet plug 4 to be screwed into the mounting hole.

[0024] A dust seal 12 is fitted on the upper outer side of the piston 8, and the outer wall of the dust seal 12 contacts the inner wall of the housing 1. When the cover plate 10 is installed, the cover plate 10 is threaded into the upper inner hole of the housing 1, and the bottom of the cover plate 12 is pressed tightly after installation.

[0025] A positioning groove 20 is provided in the middle of the top of the cover plate 10. An upper straightening cylinder 15 is provided in the positioning groove 20. A straightening rubber sleeve 14 is fixed inside the upper straightening cylinder 15. Multiple elastic protrusions 18 are evenly arranged in the inner hole of the straightening rubber sleeve 14. A skeleton dustproof ring 17 is fixed on the top of the upper straightening cylinder 15. The inner sidewall of the elastic protrusion 18 is located inside the inner wall of the straightening copper sleeve 5, so that when straightening, the elastic protrusion 18 contacts the oil rod first.

[0026] Multiple heat dissipation fins 16 are evenly fixed on the outer wall of the upper centralizing cylinder 15. The dustproof ring 12 and the skeleton dustproof ring 17 can effectively prevent external dust and impurities from entering the blowout preventer, ensuring the cleanliness of the internal components. The skeleton dustproof ring 17 consists of a metal skeleton and a rubber sealing ring fixed to the metal skeleton. The metal skeleton is fixed to the upper centralizing cylinder 15 with screws.

[0027] The bottom of the heat dissipation fins 16 is provided with a fixing flange 21 fixed to the upper straightening cylinder 15, and the lower part of the fixing flange 21 is fixed to the cover plate 10 by bolts.

[0028] During installation, the upper straightening cylinder 15 is quickly positioned by inserting it into the positioning groove 20, and then the fixing flange 21 is fixed to the cover plate 10 using bolts.

[0029] The upper straightening cylinder 15 is made of aluminum alloy. The straightening rubber sleeve 14 and the elastic protrusion 18 are preferably made of silicone rubber, and their basic hardness needs to be controlled within the Shore hardness range of 60°-80°.

[0030] The top of the cover plate 10 is evenly provided with multiple air guide slots 19. The bottom of the air guide slots 19 is an arc shape that gradually increases from the outside to the inside. The top center of the cover plate 10 is provided with an installation groove for the fixing flange 21 to be inserted. The top of the inner end of the air guide slot 19 is flush with the top of the fixing flange 21. When the air passes through the lower part of the air guide slot 19, it will flow to the upper inner side and blow towards the heat dissipation fins 16 to accelerate heat dissipation.

[0031] The above embodiments only illustrate one or more implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A wellhead blowout preventer, comprising a housing (1), a piston (8) arranged in the housing (1), a conical rubber core (9) arranged in a conical hole in the upper part of the piston (8), an upper pressure sealing oil cavity and a lower pressure releasing oil cavity formed between the piston (8) and the housing (1), an upper pressure oil plug (13) and a lower pressure oil plug (11) connected to the upper pressure sealing oil cavity and the lower pressure releasing oil cavity respectively, a cover plate (10) arranged on the top of the housing (1) to press the conical rubber core (9), and a support cylinder (7) arranged in the inner hole of the piston (8), characterized in that: An embedding groove is provided in the lower inner hole of the support cylinder (7), and a straightening copper sleeve (5) is provided in the embedding groove. The lower inner hole of the housing (1) is provided with a positioning support cylinder (7) and a support recess at the bottom of the straightening copper sleeve (5). A coolant cavity (6) is provided in the inner wall of the support cylinder (7). A coolant inlet plug (2) and a coolant outlet plug (4) are provided on the lower outer wall of the housing (1). The inner ends of the coolant inlet plug (2) and the coolant outlet plug (4) are threaded into the mounting hole of the support cylinder (7) and connected to the coolant cavity (6).

2. A blowout preventer for wellheads according to claim 1, characterized in that, The bottom of the support cylinder (7) is provided with a positioning protrusion (3), and the support recess is provided with a positioning hole that cooperates with the positioning protrusion (3).

3. A blowout preventer for wellheads according to claim 1, characterized in that, A dustproof ring (12) is fitted on the upper outer side of the piston (8), and the outer wall of the dustproof ring (12) is in contact with the inner wall of the housing (1).

4. A blowout preventer for wellheads according to claim 1, characterized in that, The top center of the cover plate (10) is provided with a positioning groove (20), the positioning groove (20) is provided with an upper straightening cylinder (15), the upper straightening cylinder (15) is fixed with a straightening rubber sleeve (14), the inner hole of the straightening rubber sleeve (14) is evenly provided with multiple elastic protrusions (18), and the top of the upper straightening cylinder (15) is fixed with a skeleton dustproof ring (17).

5. A blowout preventer for wellheads according to claim 4, characterized in that, Multiple heat dissipation fins (16) are evenly fixed on the outer wall of the upper support cylinder (15).

6. A blowout preventer for wellheads according to claim 5, characterized in that, The bottom of the heat dissipation fins (16) is provided with a fixing flange (21) fixed on the upper straightening cylinder (15), and the lower part of the fixing flange (21) is fixed to the cover plate (10) by bolts.

7. A blowout preventer for wellheads according to claim 6, characterized in that, The top of the cover plate (10) is evenly provided with multiple air guide grooves (19). The bottom of the air guide groove (19) is an arc shape that gradually increases from the outside to the inside. The top of the cover plate (10) is provided with an installation groove for the fixed flange (21) to be inserted. The top of the inner end of the air guide groove (19) is flush with the top of the fixed flange (21).

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