Wellhead hydraulic blowout preventer equipment

Abstract

The utility model provides wellhead hydraulic blowout preventer equipment which comprises a lower barrel, an upper barrel is arranged at the upper end of the lower barrel, a hydraulic cavity of an annular structure is formed in the upper barrel, a piston piece is arranged in the hydraulic cavity, a plurality of backing rings and rubber cores are arranged in the lower barrel at intervals, and the piston piece is arranged in the lower barrel. And the lower end of the piston piece is buckled and pressed on the uppermost backing ring, a first protective sleeve is arranged in the lower cylinder body, the upper edge of the first protective sleeve is located between the piston piece and the backing ring, and a second protective sleeve is fixedly connected into the upper cylinder body. The rubber core is arranged, plugging is conducted through buckling and pressing of the piston piece and deformation of the rubber core, and meanwhile the first sheath is arranged on the inner side of the rubber core and plays a role in protecting the rubber core.

Description

Technical Field

[0001] The present invention relates to the technical field of blowout preventers, in particular to a wellhead hydraulic blowout preventer device. Background Art

[0002] A blowout preventer is a device used to close the wellhead during oil field construction, such as oil testing, workover, and completion operations. Its purpose is to close the wellbore when the oil well is under pressure, maintain continuous control of the oil well, circulate the formation fluid entering the oil well, and prevent well kicks and blowouts from causing safety accidents. According to different working principles, it can be divided into ram blowout preventers and annular blowout preventers. The annular blowout preventer is mainly composed of four major parts: the shell, the top cover, the rubber core, and the piston. Its working principle is to use the hydraulic pressure in the cylinder to push the piston upward, squeeze the rubber core, and deform the rubber core toward the center to close the oil wellhead.

[0003] Most existing blowout preventers are only equipped with a rubber core. At the same time, the rubber core is deformed and in direct contact with the drill pipe. Under other factors such as vibration, the rubber core has the disadvantage of rapid wear. Summary of the Invention

[0004] In order to solve the above problems, the present invention discloses a wellhead hydraulic blowout preventer device, comprising a lower cylinder, an upper cylinder is provided at the upper end of the lower cylinder, a hydraulic chamber of an annular structure is provided inside the upper cylinder, a piston is provided inside the hydraulic chamber, a plurality of spaced gaskets and rubber cores are provided inside the lower cylinder, the lower end of the piston presses the uppermost gasket, a first sleeve is provided inside the lower cylinder, the upper edge of the first sleeve is located between the piston and the gasket, and a second sleeve is fixedly connected inside the upper cylinder. When in use, the device is installed on the wellhead, and when a blowout occurs, hydraulic oil is injected into the hydraulic chamber, the piston moves downward to press the gasket and rubber core below, the rubber core is deformed under pressure, and sticks to the drill pipe, that is, squeezes the first sleeve, so that the first sleeve and the drill pipe fit tightly together to achieve a sealing effect, while the lower part of the second sleeve above is naturally close to the drill pipe, achieving a double protection effect.

[0005] Preferably, a mounting plate is provided below the upper edge of the second sheath, screws are inserted into the mounting plate, and the screws are threadedly connected to the upper cylinder, that is, the second sheath is fixedly connected to the interior of the upper cylinder by the mounting plate and the screws.

[0006] Preferably, the upper inner wall and the outer wall of the piston are sleeved with a plurality of O-rings. The O-rings are provided to improve the sealing performance of the piston chamber.

[0007] Preferably, a sealing ring is provided at the upper end of the lower cylinder, and the sealing ring is located between the lower cylinder and the upper cylinder. The sealing ring ensures the seal between the lower cylinder and the upper cylinder.

[0008] Preferably, a plurality of bolts are inserted through the upper cylinder, and the bolts are threadedly connected to the lower cylinder, thereby achieving a fixed connection between the upper cylinder and the lower cylinder.

[0009] Preferably, the lower end of the lower cylinder is provided with a plurality of first threaded holes, and the upper end of the upper cylinder is provided with a plurality of second threaded holes. Through the first threaded holes and the second threaded holes, it is convenient to fix and connect to the wellhead.

[0010] Preferably, the side wall of the upper cylinder is provided with an oil port, and the oil port is in communication with the hydraulic chamber. Oil is injected into or discharged from the hydraulic chamber through the oil port.

[0011] The beneficial effects of the present invention are as follows:

[0012] 1. Several rubber cores can be set, and a first sheath is set on the inner side of the rubber core. The use of multiple rubber cores ensures the safety of the plugging. At the same time, the use of the first sheath protects the rubber core and reduces its wear.

[0013] 2. A second sheath is provided, which is attached to the drill pipe in a natural state and plays the role of a second sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0015] Figure 2 It is a cross-sectional schematic diagram of the present invention;

[0016] Figure 3 It is an explosion diagram of the present invention.

[0017] List of reference numerals:

[0018] 1. Lower cylinder; 2. Upper cylinder; 3. First threaded hole; 4. First sleeve; 5. Gasket; 6. Rubber core; 7. Piston; 8. Hydraulic chamber; 9. Second sleeve; 10. Second threaded hole; 11. Bolt; 12. Oil port; 13. Sealing ring; 14. Mounting plate; 15. O-ring. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, and the terms "inward" and "outward" refer to directions toward or away from the geometric center of a particular component, respectively.

[0020] like Figures 1 to 3As shown, a wellhead hydraulic blowout preventer device includes a lower cylinder 1, which is a round tube. The upper end of the lower cylinder 1 is provided with an opening, and the lower end is provided with a through hole. The upper end of the lower cylinder 1 is provided with an upper cylinder 2, and the middle part of the upper cylinder 2 is penetrated. At the same time, the middle part is provided with a flange structure. The interior of the upper cylinder 2 is provided with a hydraulic chamber 8 of an annular structure. The interior of the hydraulic chamber 8 is provided with a piston member 7, which is a tubular member. The interior of the lower cylinder 1 is provided with a plurality of spaced gaskets 5 and a rubber core 6. The lower end of the piston member 7 buckles the uppermost gasket 5 to inject hydraulic pressure into the hydraulic chamber 8. Yes, the piston 7 moves downward and squeezes the gasket 5 and the rubber core 6. The rubber core 6 is deformed and approaches the drill pipe, sealing the space between the drill pipe and the rubber core 6 to prevent blowout. A first sleeve 4 is provided inside the lower cylinder 1. The first sleeve 4 protects the rubber core 6 to prevent the rubber core 6 from direct contact with the drill pipe and damage due to wear. The upper edge of the first sleeve 4 is located between the piston 7 and the gasket 5, clamping and fixing the second sleeve 4. The interior of the upper cylinder 2 is fixedly connected with a second sleeve 9. The second sleeve 9 is attached to the drill pipe in a natural state to play a sealing role, serving as a second layer of protection.

[0021] A mounting plate 14 is provided below the upper edge of the second sheath 9. The mounting plate 14 is a circular ring. Screws are inserted into the mounting plate 14, and the screws are threadedly connected to the upper cylinder 2. The mounting plate 14 and the second sheath 9 are fixedly connected to the inside of the upper cylinder 2 by the screws.

[0022] A plurality of O-rings 15 are sleeved on the upper inner wall and the outer wall of the piston member 7, and the O-rings 15 play a sealing role.

[0023] The upper end of the lower cylinder 1 is provided with a sealing ring 13, and the sealing ring 13 is located between the lower cylinder 1 and the upper cylinder 2. The sealing ring 13 is to achieve the sealing between the lower cylinder 1 and the upper cylinder 2.

[0024] The upper cylinder 2 is provided with a plurality of bolts 11, which are threadedly connected to the lower cylinder 1. The bolts 11 are used to securely connect the upper cylinder 2 and the lower cylinder 1.

[0025] The lower end of the lower cylinder 1 is provided with a plurality of first threaded holes 3, which are connected to the pipe fittings below through the first threaded holes 3. The upper end of the upper cylinder 2 is provided with a plurality of second threaded holes 10, which are also used to achieve a fixed connection with the pipe fittings above.

[0026] The side wall of the upper cylinder 2 is provided with an oil port 12, and the oil port 12 is communicated with the hydraulic chamber 8. The device is connected to an external hydraulic source through the oil port 12.

[0027] The technical means disclosed in the solution of the present invention are not limited to the technical means disclosed in the above-mentioned embodiment, but also include technical solutions composed of any combination of the above technical features.

Claims

1. A wellhead hydraulic blowout preventer device, characterized in that: The invention comprises a lower cylinder (1), an upper cylinder (2) is provided at the upper end of the lower cylinder (1), a hydraulic chamber (8) of an annular structure is provided inside the upper cylinder (2), a piston (7) is provided inside the hydraulic chamber (8), a plurality of spaced gaskets (5) and a rubber core (6) are provided inside the lower cylinder (1), the lower end of the piston (7) buckles the uppermost gasket (5), a first sleeve (4) is provided inside the lower cylinder (1), the upper edge of the first sleeve (4) is located between the piston (7) and the gasket (5), and a second sleeve (9) is fixedly connected to the interior of the upper cylinder (2).

2. A wellhead hydraulic blowout preventer device according to claim 1, characterized in that: A mounting plate (14) is provided below the upper edge of the second sheath (9), screws are inserted through the mounting plate (14), and the screws are threadedly connected to the upper cylinder (2).

3. The wellhead hydraulic blowout preventer equipment according to claim 1, characterized in that: The upper inner wall and outer wall of the piston member (7) are sleeved with a plurality of O-rings (15).

4. The wellhead hydraulic blowout preventer equipment according to claim 1, characterized in that: A sealing ring (13) is provided at the upper end of the lower cylinder (1), and the sealing ring (13) is located between the lower cylinder (1) and the upper cylinder (2).

5. The wellhead hydraulic blowout preventer equipment according to claim 1, characterized in that: A plurality of bolts (11) are inserted into the upper cylinder (2), and the bolts (11) are threadedly connected to the lower cylinder (1).

6. The wellhead hydraulic blowout preventer equipment according to claim 1, characterized in that: The lower end of the lower cylinder (1) is provided with a plurality of first threaded holes (3), and the upper end of the upper cylinder (2) is provided with a plurality of second threaded holes (10).

7. The wellhead hydraulic blowout preventer equipment according to claim 1, characterized in that: An oil port (12) is provided on the side wall of the upper cylinder (2), and the oil port (12) is in communication with the hydraulic chamber (8).

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