Wellhead hydraulic emergency blowout preventer for operation under pressure

Abstract

The utility model discloses an under-pressure operation wellhead hydraulic emergency blowout preventer which comprises a vertical cylinder, the bottom of the vertical cylinder is connected with a connecting flange for auxiliary installation, the outer side of the vertical cylinder is communicated with a drainage pipe, the vertical cylinder is provided with a baffle ring, and the bottom face of the baffle ring is connected with a sealing lantern ring sealed with the drainage pipe through a thrust spring. A rubber ring is arranged in the vertical cylinder, a three-way pipe is connected to the outer side of the drainage pipe, one end of the three-way pipe is communicated with the rubber ring, and an elastic sealing assembly used for movably sealing the end, communicated with the drainage pipe, of the three-way pipe is arranged at the movable end of the three-way pipe. The oil injection device has the beneficial effects that through the action of the thrust spring, the sealing lantern ring can slide upwards during oil injection, oil is helped to be discharged through the drainage pipe, buffering of the oil can be achieved through the three-way pipe and the sealing assembly, the rubber ring is assisted in expansion sealing when oil pressure is large, better sealing is achieved, and oil leakage is prevented.

Description

A hydraulic emergency blowout preventer for pressurized wellhead operations Technical Field

[0001] This utility model relates to the field of oil wellhead sealing, specifically to a hydraulic emergency blowout preventer for wellheads operating under pressure. Background Technology

[0002] When working over an oil well, a blowout preventer (BOP) is crucial for ensuring operational safety. BOPs, installed at the wellhead such as blowout preventers and wellhead seals, effectively prevent blowouts and sudden outflows of underground oil and gas, ensuring the safety of personnel. During operations, the pumping unit extracts crude oil from underground to the surface, while the BOP monitors the wellhead pressure in real time. In the event of an anomaly, it can quickly shut off the well and seal the wellhead, preventing oil leakage and blowout accidents, and ensuring stable and safe oil well production.

[0003] In traditional designs, seals are often elastic, fixed ring structures. During high-pressure oil injection, the sealing rings are easily pushed open or deformed, leading to seal failure and oil leakage. Existing equipment may lack an effective drainage pipe design to efficiently and safely guide the oil to the storage area or recovery system. Summary of the Invention

[0004] The purpose of this utility model is to provide a hydraulic emergency blowout preventer for pressurized wellhead operations in order to solve the above-mentioned problems, as detailed below.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This utility model provides a hydraulic emergency blowout preventer for pressurized wellheads, including a vertical cylinder, an auxiliary installation connecting flange connected to the bottom of the vertical cylinder, a drain pipe connected to the outside of the vertical cylinder, a retaining ring provided on the vertical cylinder, and a sealing sleeve that seals with the drain pipe connected to the bottom surface of the retaining ring through a thrust spring.

[0007] The vertical cylinder is equipped with a rubber ring inside, the rubber ring has an annular cross-section, the rubber ring is located above the retaining ring, the outside of the drainage pipe is connected to a tee pipe, one end of the tee pipe is connected to the rubber ring, and the movable end of the tee pipe is provided with an elastic sealing component for movably sealing the end connected to the drainage pipe.

[0008] Furthermore, a first overflow pipe is connected to the outside of the vertical cylinder. The first overflow pipe is equipped with an oil pressure gauge and a first manual valve. The first overflow pipe is located between the retaining ring and the drain pipe.

[0009] Furthermore, the number of drainage tubes is not less than one, and each of the drainage tubes is connected to a T-junction.

[0010] Furthermore, the drainage tube is inclined toward the end of the vertical cylinder, and its high end is connected to the vertical cylinder.

[0011] Furthermore, the outside of the vertical cylinder is connected to a second overflow pipe with a second manual valve, and the second overflow pipe is located above the rubber ring.

[0012] Furthermore, the inner wall of the vertical cylinder communicating with the connecting flange is provided with a buffer chamber, the buffer chamber being part of a sphere, and the inner wall of the buffer chamber and the connecting surface of the connecting flange are provided with a sealing buffer layer.

[0013] Furthermore, the high end of the sealing buffer layer contacts and limits the sealing collar.

[0014] Furthermore, the elastic sealing assembly includes a slidably disposed sealing block, the bottom movable end of the sealing block corresponding to the drainage tube, the movable end of the tee tube being connected to a baffle, and the baffle being provided with a support spring for pushing the sealing block to move.

[0015] Furthermore, the baffle has a frame-shaped structure, the sealing block is provided with a push rod extending into the baffle, the inner wall of the baffle is provided with a spring button corresponding to the push rod, and the baffle is provided with an alarm that is electrically connected to the spring button.

[0016] The beneficial effects are:

[0017] Through the action of the thrust spring, the sealing ring can slide upward during oil injection, helping the oil to be discharged through the drain pipe;

[0018] The T-junction and sealing components can buffer the oil and assist the rubber ring to expand and seal when the oil pressure is high, thus achieving a better seal and preventing oil leakage. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 is a schematic diagram of the internal structure of this utility model;

[0021] Figure 2 is a schematic diagram of the installation structure of the elastic sealing component in this utility model.

[0022] The annotations in the attached figures are explained as follows:

[0023] 1. Vertical cylinder; 101. Connecting flange; 102. Buffer chamber; 103. Sealing buffer layer; 104. Retaining ring; 2. Drain pipe; 3. First overflow pipe; 301. Oil pressure gauge; 302. First manual valve; 4. Second overflow pipe; 401. Second manual valve; 5. T-pipe; 6. Elastic sealing assembly; 601. Sealing block; 602. Support spring; 603. Push rod; 604. Stop bracket; 605. Alarm; 606. Spring button; 7. Sealing collar; 701. Thrust spring; 8. Rubber ring. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] First embodiment:

[0026] Referring to Figures 1 and 2, this utility model provides a hydraulic emergency blowout preventer for pressurized wellheads, including a vertical cylinder 1. The bottom of the vertical cylinder 1 is connected to an auxiliary installation connecting flange 101, which can be connected to the wellhead using bolts. A drain pipe 2 is connected to the outside of the vertical cylinder 1, and the outer end of the drain pipe 2 is connected to an oil storage tank. The vertical cylinder 1 is provided with a retaining ring 104, and the bottom surface of the retaining ring 104 is connected to a sealing sleeve 7 that seals with the drain pipe 2 through a thrust spring 701.

[0027] The vertical tube 1 is equipped with a rubber ring 8 inside. The rubber ring 8 has an annular cross section and is located above the retaining ring 104. The outside of the drainage pipe 2 is connected to a three-way pipe 5. One end of the three-way pipe 5 is connected to the rubber ring 8. The movable end of the three-way pipe 5 is equipped with an elastic sealing component 6 for movably sealing the end connected to the drainage pipe 2.

[0028] When the device is in use, the connecting flange 101 is used to connect the device to the wellhead. The vertical cylinder 1 can assist the working rod in entering the well. When oil spraying occurs, the oil overcomes the elasticity of the sealing ring 7 and pushes the sealing ring 7 between the working rod and the inner wall of the vertical cylinder 1 to slide upward, realizing the connection of the drainage pipe 2. The sprayed oil can be diverted through the drainage pipe 2. When the oil pressure inside the drainage pipe 2 is high, it enters the T-pipe 5 through the drainage pipe 2. The elastic sealing component 6 can transport the oil to the rubber ring 8. The oil pressure inside the rubber ring 8 increases and the volume increases. The inner wall of the rubber ring 8 is in close contact with the working rod, which can realize the sealing and anti-splashing operation.

[0029] Since the working rod needs to move or rotate, there is a gap between the sealing ring 7 and the working rod. When the sprayed oil pressure is high, it can rise through this gap to the top of the sealing ring 7. To avoid this situation, the outside of the vertical cylinder 1 is connected to the first overflow pipe 3. The first overflow pipe 3 is equipped with an oil pressure gauge 301 and a first manual valve 302. The first overflow pipe 3 is located between the retaining ring 104 and the drain pipe 2. The first overflow pipe 3 is mainly used to detect the oil and oil pressure overflowing from the space above the sealing ring 7. It helps to discharge the oil above the sealing ring 7 through the first overflow pipe 3, thereby reducing the oil pressure above the sealing ring 7 and ensuring the conductivity of the drain pipe 2 when the oil pressure is high.

[0030] The outside of the vertical cylinder 1 is connected to a second overflow pipe 4 with a second manual valve 401. The second overflow pipe 4 is located above the rubber ring 8. The main function of the second overflow pipe 4 is to allow the oil to overflow when the rubber ring 8 and the working rod are not sealed, and to allow the oil to overflow after the working rod inside the vertical cylinder 1 is pulled out.

[0031] The second embodiment differs from the first embodiment in that:

[0032] The number of drainage pipes 2 is not less than one, and each drainage pipe 2 is connected to a three-way pipe 5. The drainage pipes 2 are evenly arranged on the outside of the vertical cylinder 1. The outer end of the drainage pipe 2 can be connected to a storage tank to facilitate the collection of overflowing oil. Furthermore, the drainage pipe 2 is inclined towards the end of the vertical cylinder 1, and its high end is connected to the vertical cylinder 1. The inclined section on the drainage pipe 2 can assist in the discharge of oil and reduce the backflow of oil.

[0033] The third embodiment differs from the first embodiment in that:

[0034] The inner wall of the vertical cylinder 1, which communicates with the connecting flange 101, is provided with a buffer chamber 102. The buffer chamber 102 is part of a spherical surface. The inner wall of the buffer chamber 102 and the connecting surface of the connecting flange 101 are provided with a sealing buffer layer 103. The buffer chamber 102 is located at the bottom opening of the vertical cylinder 1. With the cooperation of the sealing buffer layer 103 on the inner wall of the buffer chamber 102, the buffer chamber 102 can achieve a buffering and pressure reduction effect when the oil is sprayed outward. The sealing buffer layer 103 on the connecting flange 101 can play a sealing role in the connection.

[0035] Preferably, the high end of the sealing buffer layer 103 contacts and limits the sealing collar 7, so that the high end of the sealing buffer layer 103 can be used to limit the sealing collar 7. Both the sealing buffer layer 103 and the sealing collar 7 are made of rubber.

[0036] The fourth embodiment differs from the first embodiment in that:

[0037] The elastic sealing assembly 6 includes a slidingly disposed sealing block 601, which is slidably sealed with a three-way pipe 5. The three-way pipe 5 is T-shaped and horizontally disposed, meaning that the bottom end of the T-shape on the three-way pipe 5 is connected to the vertical cylinder 1. The horizontal end of the T-shape on the three-way pipe 5 is vertically disposed, with its bottom end extending downward to connect with the drainage pipe 2. The upper end of the three-way pipe 5 extends upward and is connected to a baffle 604. The movable end of the bottom of the sealing block 601 corresponds to the drainage pipe 2. The baffle 604 is provided with a support spring 602 that pushes the sealing block 601 to move. In the device structure, the oil flows through the drainage pipe 2. When the oil pressure is high, the oil can enter the interior of the three-way pipe 5, overcoming the elasticity of the support spring 602 and pushing the sealing block 601 upward to assist the oil in entering the interior of the rubber ring 8. The oil pressure inside the rubber ring 8 increases, and the pressure causes it to bulge, thus achieving the sealing operation.

[0038] Furthermore, the baffle 604 has a frame-shaped structure, and the sealing block 601 is provided with a push rod 603 extending into the baffle 604. The inner wall of the baffle 604 is provided with a spring button 606 corresponding to the push rod 603. The baffle 604 is provided with an alarm 605 electrically connected to the spring button 606. When the sealing block 601 moves, it can push the push rod 603 to slide, so that the movable end of the push rod 603 extends toward the spring button 606. When the push rod 603 presses the spring button 606, the alarm 605 sounds an alarm to remind the user.

[0039] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A hydraulic emergency blowout preventer for pressurized wellhead operations, comprising a vertical cylinder (1), characterized in that: The bottom of the vertical cylinder (1) is connected to an auxiliary installation connecting flange (101), the outside of the vertical cylinder (1) is connected to a drainage pipe (2), the vertical cylinder (1) is provided with a retaining ring (104), the bottom surface of the retaining ring (104) is connected to a sealing sleeve (7) that seals with the drainage pipe (2) through a thrust spring (701); the inside of the vertical cylinder (1) is provided with a rubber ring (8), the cross section of the rubber ring (8) is annular, the rubber ring (8) is located above the retaining ring (104), the outside of the drainage pipe (2) is connected to a three-way pipe (5), one end of the three-way pipe (5) is connected to the rubber ring (8), and the movable end of the three-way pipe (5) is provided with an elastic sealing component (6) for movably sealing the end connected to the drainage pipe (2).

2. The hydraulic emergency blowout preventer for pressurized wellhead operations according to claim 1, characterized in that: The outside of the vertical cylinder (1) is connected to a first overflow pipe (3), and the first overflow pipe (3) is equipped with an oil pressure gauge (301) and a first manual valve (302). The first overflow pipe (3) is located between the retaining ring (104) and the drain pipe (2).

3. The hydraulic emergency blowout preventer for pressurized wellhead operations according to claim 1, characterized in that: The number of drainage tubes (2) is not less than one, and each of the drainage tubes (2) is connected to a three-way tube (5).

4. The hydraulic emergency blowout preventer for pressurized wellhead operations according to claim 3, characterized in that: The drainage tube (2) is inclined toward the end of the vertical cylinder (1), and its high end is connected to the vertical cylinder (1).

5. The hydraulic emergency blowout preventer for pressurized wellhead operations according to claim 1, characterized in that: The outside of the vertical cylinder (1) is connected to a second overflow pipe (4) with a second manual valve (401), and the second overflow pipe (4) is located above the rubber ring (8).

6. The hydraulic emergency blowout preventer for pressurized wellhead operations according to claim 1, characterized in that: The inner wall of the vertical cylinder (1) communicating with the connecting flange (101) is provided with a buffer chamber (102). The buffer chamber (102) is part of a spherical surface. The inner wall of the buffer chamber (102) and the connecting surface of the connecting flange (101) are provided with a sealing buffer layer (103).

7. A hydraulic emergency blowout preventer for pressurized wellhead operations according to claim 6, characterized in that: The high end of the sealing buffer layer (103) contacts and limits the sealing collar (7).

8. A hydraulic emergency blowout preventer for pressurized wellhead operations according to claim 1, characterized in that: The elastic sealing assembly (6) includes a slidably disposed sealing block (601), the bottom movable end of the sealing block (601) corresponds to the drainage tube (2), the movable end of the tee tube (5) is connected to a baffle (604), and the baffle (604) is provided with a support spring (602) to push the sealing block (601) to move.

9. A hydraulic emergency blowout preventer for pressurized wellhead operations according to claim 8, characterized in that: The baffle (604) has a frame-shaped structure. The sealing block (601) is provided with a push rod (603) that extends into the baffle (604). The inner wall of the baffle (604) is provided with a spring button (606) corresponding to the push rod (603). The baffle (604) is provided with an alarm (605) that is electrically connected to the spring button (606).

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