A shear ram blowout preventer with independent sealing structure

Abstract

The utility model discloses a shear gate blowout preventer with an independent sealing structure, comprising a blowout preventer housing, sealing housings symmetrically arranged on both sides of the upper end of the blowout preventer housing, the output ends of the electric hydraulic cylinders arranged inside the sealing housings are respectively connected to the outer sides of corresponding sealing slides, a left shear gate and a right shear gate are respectively arranged on opposite sides of the two sealing slides, a left shear sealing seat and a lower shear knife are installed on the inner side of the left shear gate, an upper shear knife and a right shear sealing seat are installed on the inner side of the right shear gate, and an independent sealing assembly is arranged on the upper end of the sealing cover located on the outer side of the connecting drill pipe. The shear gate blowout preventer with an independent sealing structure can seal the upper parts of the left shear gate and the right shear gate through the independent sealing assembly, further improving the sealing performance of the blowout preventer, and secondly, it is used in conjunction with a discharge pipe and a pressure relief one-way valve, so as to discharge and relieve the pressure of the liquid or gas overflowing from the blowout preventer housing, thereby improving the safety of use.

Description

Technical Field

[0001] The utility model relates to the technical field related to blowout preventers, in particular to a shear ram blowout preventer with an independent sealing structure. Background Art

[0002] Blowout preventers are important equipment in oil drilling. Their main function is to prevent blowout accidents during drilling. Blowout preventers are divided into two categories according to their structure and working principle: gate blowout preventers and annular blowout preventers. Gate blowout preventers are mainly composed of a pressure-bearing shell, a side door, a gate, and a cylinder that drives the gate to close. Gate blowout preventers can be equipped with shear gates. When an emergency occurs during drilling, well repair or oil testing, the shear gates are closed to cut off the drilling tools in the well and seal the wellbore to avoid accidents.

[0003] The sealing of the shear ram blowout preventer is achieved by the shear sealing strip in the blade plane of the shear ram body. In the prior art, a top sealing structure is adopted in which the shear sealing strip is directly in contact with the upper shear ram. After the shear ram blowout preventer cuts off the drill pipe, the piston drives the upper shear ram and the lower shear ram to continue to move forward, and the blade edge of the lower shear ram slides over and compresses the shear sealing strip in the blade plane of the upper shear ram, thereby achieving sealing.

[0004] However, during use, due to poor sealing effect, liquid or gas leakage may occur, which may easily pollute the environment. Secondly, the contact stress generated by the shear gate blade compressing the shear sealing strip is large, which may easily squeeze the sealing strip and greatly reduce the sealing performance. In view of the above problems, it is necessary to improve the existing equipment. Utility Model Content

[0005] The utility model aims to provide a shear gate blowout preventer with an independent sealing structure to solve the problems raised in the above-mentioned background technology that, during use, due to poor sealing effect, liquid or gas leakage may occur, which may easily cause environmental pollution; secondly, the contact stress generated by the shear gate blade compressing the shear sealing strip is large, which may easily squeeze the sealing strip and greatly reduce the sealing performance.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a shear ram blowout preventer with an independent sealing structure, comprising a blowout preventer housing,

[0007] A sealing cover is installed on the top of the upper end of the blowout preventer housing by fixing screws, and a connecting drill pipe arranged in the middle of the upper end of the sealing cover passes through the sealing cover and is threadedly connected to the upper end of the extended drill pipe, while the lower end of the extended drill pipe passes through the blowout preventer housing and extends to the bottom of the blowout preventer housing, sealing shells are symmetrically arranged on both sides of the upper end of the blowout preventer housing, and an electric hydraulic cylinder is arranged inside the sealing shell, while the output ends of the electric hydraulic cylinder are respectively connected to the outer sides of the corresponding sealing slide seats, the upper and lower ends of the two sealing slide seats are slidably connected to the sliding grooves opened in the corresponding sealing shells, and the left shear gate and the right shear gate are respectively arranged on the opposite sides of the two sealing slide seats, while the inner sides of the left shear gate and the right shear gate are both provided with sealing side plates, the upper and lower ends of the inner side of the left shear gate are respectively provided with a left shear sealing seat and a lower shear knife, and the upper and lower ends of the inner side of the right shear gate are respectively provided with an upper shear knife and a right shear sealing seat;

[0008] The upper end of the sealing cover is located outside the connected drill pipe and is provided with an independent sealing component for reinforcing the sealing effect.

[0009] Preferably, an explosion-proof layer is provided on the inner wall of the blowout preventer housing, and a plurality of buffer springs are equidistantly installed on both sides of the lower end of the explosion-proof layer, and a buffer spring vertically arranged on one side is connected to the outer side of a correspondingly arranged limiting side plate, and a sealing gasket is provided at the lower ends of the two limiting side plates inside the explosion-proof layer, and the sealing gasket is sleeved on the outer side of the extended drill pipe, and the outer side of the extended drill pipe is fitted with the inner side of the limiting side plate.

[0010] Preferably, a discharge pipe is provided in the middle of one side of the blowout preventer housing, and a pressure relief one-way valve is installed on the discharge pipe.

[0011] Preferably, reinforcing side plates are symmetrically arranged on the upper ends of the two sealing slides, and the two reinforcing side plates are combined into a T-shaped structure, and at the same time, the tops of the two reinforcing side plates are slidably connected to the limiting grooves correspondingly opened at the lower ends of the independent sealing components.

[0012] Preferably, the positions of the left shear sealing seat and the lower shear knife are respectively arranged to correspond to the positions of the upper shear knife and the right shear sealing seat.

[0013] Preferably, the independent sealing assembly includes a threaded rubber sleeve, the middle of the outer side of the threaded rubber sleeve is connected to the middle of the upper end of the sealing cover, and a sealing top plate is provided at the bottom of the threaded rubber sleeve below the sealing cover, and electric push rods are symmetrically provided on both sides of the upper end of the sealing cover, the output end of the electric push rod is connected to the side of the lower end of the lifting plate, and the lifting plate is sleeved on the outer side of the connected drill rod, and a sleeve tube is provided in the middle of the lower end of the lifting plate, the sleeve tube is located directly above the threaded rubber sleeve, and the sleeve tube is clamped and connected to the outer side of the upper end of the threaded rubber sleeve.

[0014] Compared with the prior art, the utility model has the following beneficial effects: the shear ram blowout preventer with an independent sealing structure is

[0015] (1) In order to solve the problem that liquid or gas leakage may easily cause environmental pollution due to poor sealing effect during use, the present application is provided with an independent sealing component, a discharge pipe and a pressure relief check valve. The independent sealing component is convenient for sealing the upper part of the left shear gate and the right shear gate, thereby further improving the sealing performance of the blowout preventer. Secondly, the discharge pipe and the pressure relief check valve are used together to facilitate the discharge and pressure relief of the liquid or gas overflowing from the blowout preventer shell, thereby improving the safety of use;

[0016] (2) In order to solve the problem that the contact stress generated by the cutting edge of the lower shear gate compressing the shear sealing strip is large during use, which easily squeezes the sealing strip and greatly reduces the sealing performance, the present application is provided with a reinforced side plate, a sealed side plate, a lower shear knife, a left shear sealing seat, an upper shear knife and a right shear sealing seat. The sealing effect of the connection between the left shear gate and the right shear gate is improved by reinforcing the side plate and the sealed side plate. Then, the lower shear knife is connected and engaged with the right shear sealing seat, the left shear sealing seat and the upper shear knife, so as to improve the sealing effect when shearing the drill pipe and prevent the occurrence of blowout accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the front view structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the front cross-sectional structure of the utility model;

[0019] Figure 3 For this utility model Figure 2 The enlarged structural diagram at A in the middle;

[0020] Figure 4 For this utility model Figure 2 The enlarged structural diagram at B in the middle;

[0021] Figure 5 For this utility model Figure 2 The enlarged structural diagram at C in the middle;

[0022] Figure 6 This is a front view structural diagram of the independent sealing component of the utility model.

[0023] In the figure: 1. BOP shell; 101. Explosion-proof layer; 102. Buffer spring; 103. Limit side plate; 104. Sealing pad; 2. Sealing cover; 3. Connecting drill pipe; 4. Extending drill pipe; 5. Sealing shell; 6. Electric hydraulic cylinder; 7. Sealing slide seat; 701. Reinforced side plate; 8. Left shear gate; 9. Right shear gate; 10. Lower shear knife; 11. Sealing side plate; 12. Left shear sealing seat; 13. Upper shear knife; 14. Right shear sealing seat; 15. Independent sealing assembly; 1501. Threaded rubber sleeve; 1502. Sealing top plate; 1503. Electric push rod; 1504. Lifting plate; 1505. Socket sleeve; 16. Drain pipe; 17. Pressure relief check valve. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1-6 The utility model provides a technical solution: a shear ram blowout preventer with an independent sealing structure, according to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, a sealing cover 2 is installed on the top of the upper end of the blowout preventer housing 1 by fixing screws, and a connecting drill pipe 3 arranged in the middle of the upper end of the sealing cover 2 passes through the sealing cover 2 and is threadedly connected to the upper end of the extension drill pipe 4, while the lower end of the extension drill pipe 4 passes through the blowout preventer housing 1 and extends to the bottom of the blowout preventer housing 1, sealing housings 5 ​​are symmetrically arranged on both sides of the upper end of the blowout preventer housing 1, and an electric hydraulic cylinder 6 is arranged inside the sealing housing 5, while the output ends of the electric hydraulic cylinder 6 are respectively connected to the outer sides of the corresponding sealing slides 7, the upper and lower ends of the two sealing slides 7 are slidably connected to the slide grooves opened in the corresponding sealing housings 5, the upper ends of the two sealing slides 7 are symmetrically arranged with reinforcing side plates 701, and the two reinforcing side plates 701 are combined into a T-shaped structure, while The tops of the two reinforced side plates 701 are slidably connected to the limiting grooves corresponding to the lower ends of the independent sealing components 15, so as to improve the accuracy of the moving position direction, and the left shear gate plate 8 and the right shear gate plate 9 are respectively arranged on the opposite sides of the two sealing slide seats 7, and the inner sides of the left shear gate plate 8 and the right shear gate plate 9 are respectively provided with sealing side plates 11, and the left shear sealing seat 12 and the lower shear knife 10 are respectively installed at the upper and lower ends of the inner side of the left shear gate plate 8, and the upper and lower ends of the inner side of the right shear gate plate 9 are respectively installed at the upper and lower ends, and the positions of the left shear sealing seat 12 and the lower shear knife 10 are respectively arranged to correspond to the positions of the upper shear knife 13 and the right shear sealing seat 14, so as to improve the sealing effect when shearing the drill pipe.

[0026] Further explanation, an explosion-proof layer 101 is provided on the inner wall of the blowout preventer housing 1 to improve the explosion-proof effect and service life of the blowout preventer housing 1, and a plurality of buffer springs 102 are equidistantly installed on both sides of the lower end of the explosion-proof layer 101, and the buffer spring 102 vertically arranged on one side is connected to the outer side of the corresponding limiting side plate 103, and a sealing gasket 104 is provided at the lower end of the two limiting side plates 103 inside the explosion-proof layer 101, and the sealing gasket 104 is sleeved on the outer side of the extended drill pipe 4, and the outer side of the extended drill pipe 4 is fitted with the inner side of the limiting side plate 103, so that the extended drill pipe 4 is not easily offset when rotating, thereby improving the verticality during drilling.

[0027] To further explain, a discharge pipe 16 is provided in the middle of one side of the blowout preventer housing 1, and a pressure relief check valve 17 is installed on the discharge pipe 16 to facilitate the discharge of liquid or fluid in the blowout preventer housing 1 and avoid damage to the blowout preventer housing 1 due to excessive pressure.

[0028] according to Figure 1 , Figure 2 and Figure 6 As shown, an independent sealing component 15 is provided on the upper end of the sealing cover 2 and located outside the connecting drill pipe 3 to enhance the sealing effect.

[0029] Specifically, the independent sealing assembly 15 includes a threaded rubber sleeve 1501, the middle of the outer side of the threaded rubber sleeve 1501 is connected to the middle of the upper end of the sealing cover 2, and a sealing top plate 1502 is provided at the bottom of the threaded rubber sleeve 1501 below the sealing cover 2, and electric push rods 1503 are symmetrically provided on both sides of the upper end of the sealing cover 2, the output end of the electric push rod 1503 is connected to the side of the lower end of the lifting plate 1504, and the lifting plate 1504 is sleeved on the outer side of the connected drill pipe 3, and a sleeve tube 1505 is provided in the middle of the lower end of the lifting plate 1504, the sleeve tube 1505 is located directly above the threaded rubber sleeve 1501, and the sleeve tube 1505 is snap-connected to the outer side of the upper end of the threaded rubber sleeve 1501.

[0030] When in use, the two electric hydraulic cylinders 6 are started at the same time, so that the two electric hydraulic cylinders 6 push the corresponding sealing slide 7 to move toward the inside of the blowout preventer housing 1, so that the left shear gate 8 and the right shear gate 9 move toward the side of the connecting drill pipe 3, until the lower shear knife 10 passes through the connecting drill pipe 3 and engages with the left shear sealing seat 12, and the upper shear knife 13 passes through the connecting drill pipe 3 and engages with the right shear sealing seat 14, and the two sealing slides 7 are located at the reinforcing side plates set at the upper ends of the left shear gate 8 and the right shear gate 9. 701 is wrapped around the outside of the connected drill pipe 3 to seal the top of the connection between the left shear gate 8 and the right shear gate 9, and then the electric push rod 1503 is started to drive the lifting plate 1504 to move downward, so that the sleeve 1505 is engaged and connected with the threaded rubber sleeve 1501. When the pressure inside the blowout preventer housing 1 is too high, the pressure relief check valve 17 is opened to discharge the liquid and gas inside the blowout preventer housing 1 through the discharge pipe 16, thereby reducing the damage to the blowout preventer housing 1 and preventing the occurrence of blowout accidents.

[0031] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the protection content of the present invention.

[0032] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A shear ram blowout preventer with an independent sealing structure, comprising a blowout preventer housing (1), characterized in that: A sealing cover (2) is installed at the top of the upper end of the blowout preventer housing (1) by fixing screws, and a connecting drill rod (3) arranged in the middle of the upper end of the sealing cover (2) passes through the sealing cover (2) and is threadedly connected to the upper end of the extension drill rod (4), while the lower end of the extension drill rod (4) passes through the blowout preventer housing (1) and extends to the bottom of the blowout preventer housing (1), and sealing housings (5) are symmetrically arranged on both sides of the upper end of the blowout preventer housing (1), and an electric hydraulic cylinder (6) is arranged inside the sealing housing (5), and the output ends of the electric hydraulic cylinder (6) are respectively connected to the outer sides of the corresponding sealing slide seats (7). The upper and lower ends of the two sealing slide seats (7) are slidably connected to the slide grooves provided in the corresponding sealing housing (5), and a left shear gate (8) and a right shear gate (9) are respectively provided on opposite sides of the two sealing slide seats (7), and a sealing side plate (11) is provided on the inner sides of the left shear gate (8) and the right shear gate (9), and a left shear sealing seat (12) and a lower shear knife (10) are respectively installed on the upper and lower ends of the inner side of the left shear gate (8), and an upper shear knife (13) and a right shear sealing seat (14) are respectively installed on the upper and lower ends of the inner side of the right shear gate (9); An independent sealing component (15) is provided at the upper end of the sealing cover (2) and located outside the connected drill rod (3) to enhance the sealing effect.

2. The shear ram blowout preventer with an independent sealing structure according to claim 1, characterized in that: The inner wall of the blowout preventer housing (1) is provided with an explosion-proof layer (101), and a plurality of buffer springs (102) are equidistantly installed on both sides of the lower end of the explosion-proof layer (101), and the buffer spring (102) vertically arranged on one side is connected to the outer side of the corresponding limiting side plate (103), and a sealing gasket (104) is arranged at the lower end of the two limiting side plates (103) inside the explosion-proof layer (101), and the sealing gasket (104) is sleeved on the outer side of the extended drill pipe (4), and the outer side of the extended drill pipe (4) is in contact with the inner side of the limiting side plate (103).

3. The shear ram blowout preventer with an independent sealing structure according to claim 1, characterized in that: A discharge pipe (16) is arranged in the middle of one side of the blowout preventer housing (1), and a pressure relief one-way valve (17) is installed on the discharge pipe (16).

4. The shear ram blowout preventer with an independent sealing structure according to claim 1, characterized in that: Reinforced side plates (701) are symmetrically arranged at the upper ends of the two sealing slide seats (7), and the two reinforced side plates (701) are combined into a T-shaped structure. At the same time, the tops of the two reinforced side plates (701) are slidably connected to the limiting grooves correspondingly opened at the lower ends of the independent sealing components (15).

5. The shear ram blowout preventer with an independent sealing structure according to claim 1, characterized in that: The positions of the left shearing seal seat (12) and the lower shearing knife (10) are respectively arranged to correspond to the positions of the upper shearing knife (13) and the right shearing seal seat (14).

6. The shear ram blowout preventer with an independent sealing structure according to claim 1, characterized in that: The independent sealing component (15) comprises a threaded rubber sleeve (1501), the middle of the outer side of the threaded rubber sleeve (1501) is connected to the middle of the upper end of the sealing cover (2), and a sealing top plate (1502) is arranged at the bottom of the threaded rubber sleeve (1501) below the sealing cover (2), and electric push rods (1503) are symmetrically arranged on both sides of the upper end of the sealing cover (2), the output end of the electric push rod (1503) is connected to the side of the lower end of the lifting plate (1504), and the lifting plate (1504) is sleeved on the outer side of the connected drill pipe (3), and a sleeve tube (1505) is arranged in the middle of the lower end of the lifting plate (1504), the sleeve tube (1505) is located directly above the threaded rubber sleeve (1501), and the sleeve tube (1505) is snap-fitted and connected to the outer side of the upper end of the threaded rubber sleeve (1501).

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