Wellhead blowout preventer of rod-pumped well

Abstract

The invention belongs to the technical field of rod-pumped wells, and particularly relates to a rod-pumped well wellhead blowout preventer which comprises an upper section assembly and a lower section assembly, the upper section assembly comprises a well plugging pipe, a horn mouth is fixedly installed on the well plugging pipe, a single full-sealed gate is installed on the well plugging pipe, a pressure release pipe is fixedly installed on the pipe wall of the well plugging pipe, and the single full-sealed gate is connected with the pressure release pipe. The pressure release pipe is communicated with the well plugging pipe, a pressure release gate is arranged on the pressure release pipe, and a pressure gauge is further fixedly arranged on the pressure release pipe; and the lower section assembly is a double-semi-closed gate blowout preventer. The method can effectively and quickly solve the problem of well mouth out-of-control caused by falling of a rod column and breakage of a polished rod in the well repair operation and production process of a rod-pumped well, and avoids accidents of oil gas overflow in the well, well mouth fire disasters, environmental pollution, safety and environmental protection.

Description

Technical Field

[0001] The invention belongs to the technical field of pumping well, and particularly relates to a blowout preventer for the wellhead of a pumping well. Background Art

[0002] When pulling out and running in the sucker rod string during workover operations of pumping wells, due to the lack of bottom hole energy, the blowout prevention measures basically rely on washing the well and degassing before the operation, rather than taking reliable equipment to carry out blowout prevention measures during the operation.

[0003] During the long-term exploitation process of pumping wells, the polished rod may break at the position where the clamp is installed on the hanger. As a result, the lower part of the broken position falls into the well pipe string. Since the secondary seal of the stuffing box at the wellhead belongs to a semi-closed blowout preventer tool, it is impossible to seal the wellhead without the polished rod, and the oil and gas in the wellbore will be out of control. If not properly handled, it will cause safety and environmental protection accidents.

[0004] Therefore, we propose a blowout preventer for the wellhead of a pumping well to solve the above problems. Summary of the Invention

[0005] The purpose of the invention is to provide a blowout preventer for the wellhead of a pumping well in view of the above problems.

[0006] To achieve the above purpose, the invention provides the following technical solution: A blowout preventer for the wellhead of a pumping well includes an upper section assembly and a lower section assembly. The upper section assembly includes a well sealing pipe, on which a bell mouth is fixedly installed, a single full-closed gate is installed on the well sealing pipe, a pressure relief pipe is fixedly installed on the pipe wall of the well sealing pipe, the pressure relief pipe is communicated with the well sealing pipe, a pressure relief gate is installed on the pressure relief pipe, and a pressure gauge is also fixedly installed on the pressure relief pipe.

[0007] The lower section assembly is a double half-closed gate blowout preventer.

[0008] In the blowout preventer for the wellhead of the above-mentioned pumping well, the upper end of the pressure relief pipe is fixedly communicated with an installation pipe, the pressure gauge is fixedly installed on the installation pipe, the upper end of the installation pipe and the lower end of the pressure gauge are both fixedly connected with connecting flanges, the two connecting flanges are in contact connection, a plurality of connecting screw holes are evenly opened on the surfaces of the two connecting flanges, and corresponding connecting screw holes are internally threaded with connecting screw rods. The upper end of the connecting screw rod is fixedly connected with an anti-disengagement plate, the lower end rod wall of the connecting screw rod is threaded with a locking nut, and a clamping mechanism for clamping the locking nut is fixedly installed at the upper end of the pressure relief pipe.

[0009] In the above blowout preventer for the wellhead of a pumping unit well, the clamping mechanism includes two side plates symmetrically and fixedly connected to the upper end of the pressure release pipe. Two guiding slide rods are fixedly connected between the two side plates. The same moving plate is slidably sleeved outside the two guiding slide rods. Two extrusion springs sleeved outside the guiding slide rods are fixedly connected between the rear side plate and the moving plate. The upper end side wall of the moving plate is fixedly connected with a U-shaped fastening plate clamped outside the locking nut.

[0010] In the above blowout preventer for the wellhead of a pumping unit well, an anti-slip extrusion rubber pad is fixedly connected to the inner wall of the U-shaped fastening plate.

[0011] In the above blowout preventer for the wellhead of a pumping unit well, the lower end of the well sealing pipe is fixedly connected with the upper end of the double half-closed gate blowout preventer by threads.

[0012] In the above blowout preventer for the wellhead of a pumping unit well, the outer surfaces of the single full-closed gate and the pressure release gate are both coated with an anti-slip rubber sleeve.

[0013] In the above blowout preventer for the wellhead of a pumping unit well, an anti-corrosion paint layer is sprayed on the inner walls of the well sealing pipe and the pressure release pipe.

[0014] Compared with the prior art, the present invention provides a blowout preventer for the wellhead of a pumping unit well, which has the following beneficial effects:

[0015] 1. For the blowout preventer for the wellhead of a pumping unit well, through the provided well sealing pipe, bell mouth, single full-closed gate, pressure release pipe, pressure release gate, pressure gauge, and double half-closed gate blowout preventer, the bell mouth is used to prevent the coupling from getting stuck on the pipe thread during the work of pulling and lowering the sucker rod in well repair operations. The single full-closed gate is used to seal the well after being closed. The pressure gauge is used for monitoring the wellbore pressure. The pressure release gate can achieve the safe release of the wellbore pressure. The double half-closed gate blowout preventer can achieve well closure after being closed. The single full-closed gate, pressure release gate, pressure gauge, and bell mouth form the well sealing device of the upper section assembly, and the lower section assembly is the double half-closed gate blowout preventer, which can be disassembled and assembled flexibly according to actual situations. When the rod string falls into the well, quickly closing the single full-closed gate can achieve the purpose of sealing the well. When the operation stops midway, closing the double half-closed gate can achieve the purpose of closing the well. When the polished rod breaks during the production process, remove the gland of the stuffing box at the wellhead, install the upper section assembly of the well sealing device, and closing the single full-closed gate can achieve the purpose of quickly sealing the well, filling the deficiencies of the blowout prevention and well sealing during the process of pulling and lowering the rod string in the current well repair operations and the emergency well sealing tools during the production process of pumping unit wells, effectively and quickly solving the risks and potential hazards such as wellhead out-of-control caused by the rod string falling into the well and polished rod breakage during the well repair and production processes of mechanical oil production wells, resulting in oil and gas leakage, wellhead fire, environmental pollution, etc.; it is quick and convenient to install, has high reliability, and can eliminate the safety and environmental protection hazards brought by the out-of-control of the mechanical oil production wellhead; it can adjust the thread type according to the size of the wellhead at any time to adapt to the blowout prevention and well sealing of various mechanical oil production wells; it has low cost and can be reused, and can be used as a daily well repair tool and emergency equipment.

[0016] 2. The blowout preventer at the wellhead of the pumping unit well is equipped with a pressure gauge. The pressure gauge and the installation pipe are fixedly connected through two connecting flanges to achieve rapid connection with the pressure relief pipe. The connecting screw holes on the two connecting flanges are locked and fixed through connecting screws. The lower end of the connecting screw is fixed through a locking nut. The extrusion spring pushes the moving plate to slide along the guiding slide rod, so that the moving plate clamps the U-shaped fastening plate outside the locking nut, thereby realizing the limit fixation of the locking nut, and can achieve a stable connection between the pressure relief pipe and the pressure gauge, avoiding the problem that the connection loosens due to air flow vibration and affecting the use stability of the entire structure.

[0017] In summary, the present invention can effectively and quickly solve the problem of out-of-control wellheads caused by rod string falling into the well and polished rod fracture during well workover operations and production processes of pumping unit wells, and avoid safety and environmental protection incidents such as oil and gas overflow in the well, wellhead fires, and environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the blowout preventer at the wellhead of the pumping unit well proposed by the present invention;

[0019] Figure 2 is an enlarged installation structural diagram of the pressure gauge of the blowout preventer at the wellhead of the pumping unit well proposed by the present invention;

[0020] Figure 3 is a schematic structural diagram of the clamping mechanism of the blowout preventer at the wellhead of the pumping unit well proposed by the present invention.

[0021] In the figure: 1, sealing well pipe; 2, bell mouth; 3, single full-closed gate; 4, pressure relief pipe; 5, pressure relief gate; 6, pressure gauge; 7, double half-closed gate blowout preventer; 8, installation pipe; 9, connecting flange; 10, connecting screw hole; 11, connecting screw; 12, anti-disconnection plate; 13, locking nut; 14, side plate; 15, guiding slide rod; 16, moving plate; 17, extrusion spring; 18, U-shaped fastening plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following embodiments are only for illustrative purposes and are not intended to limit the scope of the present invention.

[0023] Please refer to Figures 1 - 3 , the blowout preventer at the wellhead of the pumping unit well includes an upper section assembly and a lower section assembly. The upper section assembly includes a sealing well pipe 1, on which a bell mouth 2 is fixedly installed, a single full-closed gate 3 is installed on the sealing well pipe 1, a pressure relief pipe 4 is fixedly installed on the pipe wall of the sealing well pipe 1, the pressure relief pipe 4 is communicated with the sealing well pipe 1, a pressure relief gate 5 is installed on the pressure relief pipe 4, and a pressure gauge 6 is also fixedly installed on the pressure relief pipe 4;

[0024] The lower section assembly is a double half-closed gate blowout preventer 7.

[0025] The upper end of the pressure release pipe 4 is fixedly connected and communicated with an installation pipe 8. The pressure gauge 6 is fixedly installed on the installation pipe 8. Both the upper end of the installation pipe 8 and the lower end of the pressure gauge 6 are fixedly connected with connecting flanges 9. The two connecting flanges 9 are in contact connection with each other. A plurality of connecting screw holes 10 are evenly formed on the surfaces of the two connecting flanges 9. And a connecting screw rod 11 is threadedly sleeved in the corresponding connecting screw hole 10. The upper end of the connecting screw rod 11 is fixedly connected with an anti-detachment plate 12. A locking nut 13 is threadedly sleeved on the lower rod wall of the connecting screw rod 11. A clamping mechanism for clamping the locking nut 13 is fixedly installed at the upper end of the pressure release pipe 4.

[0026] The clamping mechanism includes two side plates 14 symmetrically and fixedly connected to the upper end of the pressure release pipe 4. Two guiding slide rods 15 are fixedly connected between the two side plates 14. The same moving plate 16 is slidably sleeved outside the two guiding slide rods 15. Two extrusion springs 17 sleeved outside the guiding slide rods 15 are fixedly connected between the rear side plate 14 and the moving plate 16. The upper side wall of the moving plate 16 is fixedly connected with a U-shaped fastening plate 18 clamped outside the locking nut 13.

[0027] An anti-slip extrusion rubber pad is fixedly connected to the inner wall of the U-shaped fastening plate 18.

[0028] The lower end of the well sealing pipe 1 is fixedly connected with the upper end of the double half-sealing gate blowout preventer 7 by threads.

[0029] The outer surfaces of the single full-sealing gate 3 and the pressure release gate 5 are both coated with an anti-slip rubber sleeve.

[0030] The inner walls of the well sealing pipe 1 and the pressure release pipe 4 are both sprayed with an anti-corrosion paint.

[0031] The operating principle of the present invention is described as follows: Through the provided well sealing pipe 1, bell mouth 2, single full-closed gate 3, pressure relief pipe 4, pressure relief gate 5, pressure gauge 6, and double half-closed gate blowout preventer 7, the bell mouth 2 is used to prevent the coupling from colliding with the pipe thread during the workover operation of pulling and lowering the sucker rod. The single full-closed gate 3 is used to seal the well after being closed. The pressure gauge 6 monitors the wellbore pressure. The pressure relief gate 5 can safely release the wellbore pressure. The double half-closed gate blowout preventer 7 can close the well after being closed. The single full-closed gate 3, pressure relief gate 5, pressure gauge 6, and bell mouth 2 form the blowout preventer of the upper section assembly. The lower section assembly is the double half-closed gate blowout preventer 7, which can be flexibly disassembled and assembled for use according to the actual situation. When the rod string falls into the well, quickly closing the single full-closed gate 3 can achieve the purpose of sealing the well. When the operation stops midway, closing the double half-closed gate can achieve the purpose of closing the well. During the production process, when the polished rod breaks, remove the gland of the stuffing box at the wellhead, install the upper section assembly of the blowout preventer, and closing the single full-closed gate 3 can achieve the purpose of quickly sealing the well, filling the deficiencies of the blowout prevention and well sealing during the workover operation of pulling and lowering the rod string and the emergency well sealing tools during the production process of the pumping well, effectively and quickly solving the problems of wellhead out-of-control caused by the rod string falling into the well, polished rod breakage, etc. during the workover and production of the mechanical production well, resulting in risk hazards such as oil and gas leakage, wellhead fire, and environmental pollution; it is quick and convenient to install, has high reliability, and can eliminate the safety and environmental protection hazards brought by the out-of-control of the mechanical production wellhead; it can adjust the thread type according to the size of the wellhead at any time to adapt to the blowout prevention and well sealing of various mechanical production wells; it has low cost and can be reused, and can be used as a daily workover tool and emergency equipment. Through the provided pressure gauge 6, the pressure gauge 6 and the installation pipe 8 are fixed through two connecting flanges 9 to achieve a quick connection with the pressure relief pipe 4. The connecting screw holes 10 on the two connecting flanges 9 are locked and fixed through the connecting screw 11. The lower end of the connecting screw 11 is fixed through the locking nut 13. The extrusion spring 17 pushes the moving plate 16 to slide along the guiding slide rod 15, so that the moving plate 16 sleeved the U-shaped fastening plate 18 outside the locking nut 13, and the limit fixation of the locking nut 13 can be achieved, which can realize the stable connection between the pressure relief pipe 4 and the pressure gauge 6, and avoid the problem that the looseness of the connection caused by the air flow vibration affects the use stability of the whole structure.

[0032] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Blowout preventer for the wellhead of a pumping unit, comprising an upper section assembly and a lower section assembly, characterized in that: The upper section assembly includes a well sealing pipe (1), on which a flared mouth (2) is fixedly installed, a single full - closing gate (3) is installed on the well sealing pipe (1), a pressure - releasing pipe (4) is fixedly installed on the pipe wall of the well sealing pipe (1), the pressure - releasing pipe (4) is communicated with the well sealing pipe (1), a pressure - releasing gate (5) is installed on the pressure - releasing pipe (4), and a pressure gauge (6) is also fixedly installed on the pressure - releasing pipe (4). The lower section assembly is a double half - closing gate blowout preventer (7).

2. The blowout preventer for the wellhead of the pumping unit well according to claim 1, wherein: The upper end of the pressure - releasing pipe (4) is fixedly communicated with an installation pipe (8), the pressure gauge (6) is fixedly installed on the installation pipe (8), both the upper end of the installation pipe (8) and the lower end of the pressure gauge (6) are fixedly connected with connecting flanges (9), the two connecting flanges (9) are in contact connection with each other, a plurality of connecting screw holes (10) are evenly opened on the surfaces of the two connecting flanges (9), and a connecting screw (11) is threadedly sleeved in the corresponding connecting screw hole (10). The upper end of the connecting screw (11) is fixedly connected with an anti - detachment plate (12), a locking nut (13) is threadedly sleeved on the lower rod wall of the connecting screw (11), and a clamping mechanism for clamping the locking nut (13) is fixedly installed at the upper end of the pressure - releasing pipe (4).

3. The blowout preventer for the wellhead of a pumping unit well according to claim 2, wherein: The clamping mechanism includes two side plates (14) symmetrically and fixedly connected to the upper end of the pressure - releasing pipe (4). Two guiding slide rods (15) are fixedly connected between the two side plates (14). The same moving plate (16) is slidably sleeved outside the two guiding slide rods (15). Two extrusion springs (17) sleeved outside the guiding slide rods (15) are fixedly connected between the rear - side side plate (14) and the moving plate (16). The upper side wall of the moving plate (16) is fixedly connected with a U - shaped fastening plate (18) clamped outside the locking nut (13).

4. The blowout preventer for the wellhead of a pumping unit well according to claim 3, characterized in that: An anti - slip extrusion rubber pad is fixedly connected to the inner wall of the U - shaped fastening plate (18).

5. The blowout preventer for the wellhead of a pumping unit well according to claim 1, wherein: The lower end of the well sealing pipe (1) is fixedly connected with the upper end of the double half - closing gate blowout preventer (7) by threads.

6. The blowout preventer for the wellhead of a pumping unit well according to claim 1, characterized in that: The outer surfaces of the single full - closing gate (3) and the pressure - releasing gate (5) are both coated with a layer of anti - slip rubber sleeve.

7. The blowout preventer for the wellhead of a pumping unit well according to claim 1, wherein: The inner walls of the well sealing pipe (1) and the pressure - releasing pipe (4) are both sprayed with a layer of anti - corrosion paint.

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