A variable-diameter blowout preventer

Abstract

The utility model discloses a variable diameter blowout preventer pipe relates to wellhead sealing blowout preventer technical field, and its technical key points include main pipeline, the top of main pipeline installs first variable diameter pipe, the top of first variable diameter pipe installs second variable diameter pipe, the top of second variable diameter pipe installs the top pipe, the utility model discloses when using, realized through variable diameter pipe group and realized the passage diameter adaptation, and pressure sensor and blowout preventer valve guarantee safety, with the help of flange, U -shaped clamping plate and locking assembly, realize quick firm connection with least three bolts, trapezoidal positioning structure realizes pipeline accurate butt joint, and the overall operation efficiency, safety and convenience are improved.

Description

Technical Field

[0001] This utility model relates to the field of wellhead sealing and blowout prevention technology, specifically a variable diameter blowout preventer pipe. Background Technology

[0002] In oil and gas drilling and well workover operations, variable diameter blowout preventers (BOPs) are key equipment for controlling wellhead pressure and preventing blowout accidents. They need to be adapted to the changes in the diameter of downhole tools and wellhead equipment through the combination of pipes of different diameters. The pipe connections of existing variable diameter BOPs mostly rely on traditional flange structures, and sealing and fixing are achieved by tightening multiple bolts.

[0003] However, the lack of a precise positioning structure during pipeline connection requires operators to repeatedly adjust the flange position to align the bolt holes. This is not only time-consuming and labor-intensive, but may also lead to a decrease in connection sealing due to misalignment, increasing the risk of leakage. On the other hand, to ensure the connection strength under high-pressure conditions, each flange set usually needs to be equipped with 8-12 bolts. They need to be tightened one by one during installation and loosened one by one during disassembly. This seriously restricts work efficiency and delays the time for accident handling in emergency rescue and other scenarios. Therefore, it is necessary to redesign a variable diameter blowout preventer to address the above problems. Utility Model Content

[0004] One technical problem to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a variable diameter blowout preventer, which solves the problems of difficult pipe docking and positioning, and the cumbersome and inefficient disassembly and assembly caused by the need for multiple bolts in flange connections.

[0006] Two technical solutions

[0007] To achieve the above objectives, this utility model provides the following technical solution: a variable diameter blowout preventer, comprising a main pipe, a first variable diameter pipe installed at the top end of the main pipe, a second variable diameter pipe installed at the top end of the first variable diameter pipe, a top pipe installed at the top end of the second variable diameter pipe, quick-connect mechanisms installed between the main pipe and the first variable diameter pipe, between the first variable diameter pipe and the second variable diameter pipe, and between the second variable diameter pipe and the top pipe, a pressure sensor installed on the outside of the main pipe, and a blowout preventer valve installed at the top end of the top pipe.

[0008] Preferably, each of the quick-connect mechanisms includes a lower flange and an upper flange. The lower flange is fixedly connected to the top end of the lower pipe, and the upper flange is fixedly connected to the bottom end of the upper pipe. Multiple U-shaped clamping plates are engaged between each of the lower and upper flanges. An annular clamping cylinder is installed on the top surface of each U-shaped clamping plate, and a locking component is installed on the top surface of each upper flange, which restricts the position of the U-shaped clamping plate.

[0009] Preferably, each upper flange has multiple trapezoidal positioning grooves symmetrically formed on its bottom surface, and each lower flange has multiple trapezoidal positioning blocks symmetrically installed on its top surface, with each trapezoidal positioning block being engaged in the corresponding trapezoidal positioning groove.

[0010] Preferably, each locking assembly includes multiple arc-shaped sleeves, which are circumferentially distributed and installed on the top surface of the upper flange. Each arc-shaped sleeve has an arc-shaped plate slidably connected inside it, and one end of each arc-shaped plate passes through a corresponding annular retainer and is engaged in the adjacent arc-shaped sleeve. Each arc-shaped plate has a bolt installed on its top surface, and each bolt is threaded to the top of the upper flange. Each arc-shaped sleeve has a through groove on its top surface, and each arc-shaped plate has a handle installed on its top surface, with each handle movably connected in the corresponding through groove.

[0011] Preferably, each of the lower flanges has multiple lower slots symmetrically formed on its bottom surface, and each of the upper flanges has multiple upper slots symmetrically formed on its top surface, with each U-shaped clamping plate having both ends respectively clamped in the corresponding upper and lower slots.

[0012] Preferably, each upper flange has an annular locking block installed on its bottom surface, each lower flange has an annular groove on its top surface, each annular groove has a sealing ring installed in it, and each annular locking block abuts against the corresponding sealing ring.

[0013] Three beneficial effects

[0014] Compared with the prior art, the present invention provides a variable diameter blowout preventer, which has the following advantages:

[0015] 1. This utility model achieves pipe diameter adaptation and safe pressure control through devices such as a first reducing pipe, a second reducing pipe, a third reducing pipe, a jacking pipe, a blowout preventer valve, and a pressure sensor. The reducing pipe group meets different pipe diameter requirements, the pressure sensor monitors the pressure, and the blowout preventer valve shuts off in an emergency, ensuring safe and efficient operation.

[0016] 2. This utility model achieves rapid and stable connection of pipelines and reduces the use of bolts by using devices such as lower flange, upper flange, U-shaped clamping plate, annular clamping cylinder, and locking components. The U-shaped clamping plate is initially fixed, and the annular clamping cylinder works with the arc plate to lock multiple clamping plates simultaneously. The arc plate is fixed by bolts. Because the arc plate is distributed around the circumference to form an overall locking force, at least three bolts are needed to balance the force, replacing the traditional multi-bolt fastening.

[0017] 3. This utility model achieves rapid and accurate positioning of pipe connections through trapezoidal positioning blocks, trapezoidal positioning grooves, and other devices. The trapezoidal structure of the positioning block and the positioning groove has a guiding function. Operators do not need to finely align the pipes; simply pushing the pipes will allow the positioning blocks to slide into the grooves for automatic calibration, reducing alignment time, ensuring coaxiality of the connection, and improving installation efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a variable diameter blowout preventer proposed in this utility model;

[0019] Figure 2 This is a schematic diagram of a U-shaped clamping plate installation structure for a variable diameter blowout preventer proposed in this utility model;

[0020] Figure 3 This is a schematic diagram of a quick-connect mechanism for a variable-diameter blowout preventer proposed in this utility model.

[0021] Figure 4 This is a schematic diagram of the sealing ring installation structure of a variable diameter blowout preventer proposed in this utility model;

[0022] Figure 5 This is a schematic diagram of the T-shaped positioning groove structure for a variable diameter blowout preventer proposed in this utility model.

[0023] In the diagram: 1. Main pipe; 2. First reducer; 3. Second reducer; 4. Jacking pipe; 5. Blowout preventer valve; 6. Pressure sensor; 7. Lower flange; 8. Upper flange; 9. U-shaped clamping plate; 10. Annular clamping sleeve; 11. Arc sleeve; 12. Arc plate; 13. Through groove; 14. Handle; 15. Bolt; 16. Upper clamping groove; 17. Lower clamping groove; 18. Trapezoidal positioning block; 19. Annular groove; 20. Sealing ring; 21. Annular clamping block; 22. Trapezoidal positioning groove. Detailed Implementation

[0024] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0025] This utility model provides a technical solution for a variable diameter blowout preventer:

[0026] Please see Figures 1-5 A variable diameter blowout preventer includes a main pipe 1, a first variable diameter pipe 2 installed at the top of the main pipe 1, a second variable diameter pipe 3 installed at the top of the first variable diameter pipe 2, a jacking pipe 4 installed at the top of the second variable diameter pipe 3, quick-connect mechanisms installed between the main pipe 1 and the first variable diameter pipe 2, between the first variable diameter pipe 2 and the second variable diameter pipe 3, and between the second variable diameter pipe 3 and the jacking pipe 4, a pressure sensor 6 installed on the outside of the main pipe 1, and a blowout preventer valve 5 installed at the top of the jacking pipe 4.

[0027] The main pipe 1, the first reducing pipe 2, the second reducing pipe 3, and the jacking pipe 4 constitute the main flow channel of the equipment, realizing the gradual change of pipe diameter to adapt to different operational needs. The quick connection mechanism is used to realize the quick connection and disassembly between the pipes. The pressure sensor 6 can monitor the pressure in the main pipe 1 in real time. The blowout preventer valve 5 can close when the pressure is abnormal to prevent blowout accidents and ensure operational safety.

[0028] Furthermore, each quick-connect mechanism includes a lower flange 7 and an upper flange 8. The lower flange 7 is fixedly connected to the top end of the lower pipe, and the upper flange 8 is fixedly connected to the bottom end of the upper pipe. Multiple U-shaped clamping plates 9 are clamped between each lower flange 7 and the upper flange 8. An annular clamping cylinder 10 is installed on the top surface of each U-shaped clamping plate 9, and a locking component is installed on the top surface of each upper flange 8. The locking component restricts the position of the U-shaped clamping plate 9.

[0029] The U-shaped clamp 9 serves as a preliminary fixation and connection, while the annular clamp 10 provides the action point for the locking assembly. The locking assembly further stabilizes the connection between the lower flange 7 and the upper flange 8 by restricting the position of the U-shaped clamp 9, ensuring the reliability of the connection.

[0030] Furthermore, each upper flange 8 has multiple trapezoidal positioning grooves 22 symmetrically opened on its bottom surface, and each lower flange 7 has multiple trapezoidal positioning blocks 18 symmetrically installed on its top surface, with each trapezoidal positioning block 18 being engaged in the corresponding trapezoidal positioning groove 22.

[0031] The trapezoidal positioning block 18 and the trapezoidal positioning groove 22 work together to achieve rapid and accurate positioning of the lower flange 7 and the upper flange 8. Moreover, the workers do not need to align them precisely. With the cooperation of the trapezoidal positioning block 18 and the trapezoidal positioning groove 22, accurate positioning can be achieved automatically, avoiding the difficulty of alignment during installation, reducing installation time, improving the efficiency of pipe connection, and ensuring the coaxiality of the upper and lower pipe connections.

[0032] Furthermore, each locking assembly includes multiple arc-shaped sleeves 11, which are circumferentially distributed and installed on the top surface of the upper flange 8. Each arc-shaped sleeve 11 is slidably connected with an arc-shaped plate 12, and one end of each arc-shaped plate 12 passes through the corresponding annular retainer 10 and is engaged in the adjacent arc-shaped sleeve 11. Each arc-shaped plate 12 is equipped with a bolt 15 on its top surface, and each bolt 15 is threaded to the top of the upper flange 8. Each arc-shaped sleeve 11 is provided with a through groove 13 on its top surface, and each arc-shaped plate 12 is equipped with a handle 14 on its top surface, and each handle 14 is movably connected in the corresponding through groove 13.

[0033] The arc-shaped sleeve 11 provides a sliding track for the arc-shaped plate 12. The arc-shaped plate 12 passes through the annular clamp 10 and is engaged with the adjacent arc-shaped sleeve 11, which enhances the structural stability. The bolts 15 are used to fix the position of the arc-shaped plate 12 and prevent it from sliding. The through groove 13 provides a space for the handle 14 to move. The handle 14 makes it convenient for the operator to slide the arc-shaped plate 12. The overall structure achieves effective locking of the U-shaped clamp 9 and is easy to operate. Moreover, the arc-shaped plate 12 is circumferentially distributed to form an overall locking force. Therefore, at least three bolts 15 can balance the force, replacing the traditional multi-bolt fastening.

[0034] Furthermore, each lower flange 7 has multiple lower slots 17 symmetrically opened on its bottom surface, and each upper flange 8 has multiple upper slots 16 symmetrically opened on its top surface. Both ends of each U-shaped clamping plate 9 are respectively clamped in the corresponding upper slot 16 and lower slot 17.

[0035] Furthermore, each upper flange 8 has an annular locking block 21 installed on its bottom surface, and each lower flange 7 has an annular groove 19 opened on its top surface. Each annular groove 19 has a sealing ring 20 installed in it, and each annular locking block 21 abuts against the corresponding sealing ring 20.

[0036] The annular locking block 21 can exert pressure on the sealing ring 20, causing the sealing ring 20 to deform, thereby filling the gap between the annular locking block 21 and the annular groove 19, ensuring the sealing performance of the connection between the lower flange 7 and the upper flange 8, preventing fluid leakage in the pipeline, and adapting to high-pressure operating environments.

[0037] In practical use, the working principle of this utility model is as follows:

[0038] First, the operator places the main pipe 1, the first reducer 2, the second reducer 3 and the jacking pipe 4 in sequence, aligns them with the connection ends of the adjacent pipes, and aligns the trapezoidal positioning block 18 on the lower flange 7 at the top of the lower pipe with the trapezoidal positioning groove 22 on the upper flange 8 at the bottom of the upper pipe. The operator gently pushes the pipe to let the trapezoidal positioning block 18 slide into the groove. The trapezoidal structure automatically completes the precise alignment without repeated adjustments.

[0039] Next, take multiple U-shaped clamping plates 9 and insert their two ends into the lower clamping groove 17 of the lower flange 7 and the upper clamping groove 16 of the upper flange 8 respectively, ensuring that the clamping plates fit tightly against the flanges;

[0040] Then, hold the handle 14 and push the arc plate 12 along the through groove 13 of the arc sleeve 11 so that one end of it passes through the annular clamp 10 of the U-shaped clamp 9 and is inserted into the adjacent arc sleeve 11. Then tighten the bolts 15 on the arc plate 12 to fix the arc plate 12 on the upper flange 8. At this time, the U-shaped clamp 9 is firmly locked, and the pipe connection is completed.

[0041] At the same time, the annular retaining block 21 on the bottom surface of the upper flange 8 presses the sealing ring 20 in the annular groove 19 of the lower flange 7 to form a sealing structure to prevent leakage.

[0042] During operation, the pressure sensor 6 on the outside of the main pipeline 1 monitors the pressure inside the pipe in real time and feeds the data back to the control system. If the pressure exceeds the safe range, the blowout preventer valve 5 at the top of the jacking pipe 4 can be closed manually or automatically to block the fluid passage and prevent blowout. When disassembling, simply loosen the bolt 15 and pull the handle 14 to disengage the arc plate 12 from the annular clamp 10 and the arc sleeve 11, and the U-shaped clamp 9 can be removed to separate the pipeline. The whole process is efficient and convenient.

[0043] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. A variable diameter blowout preventer, comprising a main pipe (1), characterized in that, The top end of the main pipe (1) is equipped with a first reducing pipe (2), the top end of the first reducing pipe (2) is equipped with a second reducing pipe (3), the top end of the second reducing pipe (3) is equipped with a jacking pipe (4), quick connection mechanisms are installed between the main pipe (1) and the first reducing pipe (2), between the first reducing pipe (2) and the second reducing pipe (3), and between the second reducing pipe (3) and the jacking pipe (4), a pressure sensor (6) is installed on the outside of the main pipe (1), and a blowout preventer valve (5) is installed at the top end of the jacking pipe (4).

2. A variable diameter blowout preventer according to claim 1, characterized in that, Each of the quick-connect mechanisms includes a lower flange (7) and an upper flange (8). The lower flange (7) is fixedly connected to the top end of the lower pipe, and the upper flange (8) is fixedly connected to the bottom end of the upper pipe. Multiple U-shaped clamping plates (9) are clamped between each of the lower flange (7) and the upper flange (8). An annular clamping cylinder (10) is installed on the top surface of each of the U-shaped clamping plates (9), and a locking component is installed on the top surface of each of the upper flanges (8), and the locking component restricts the position of the U-shaped clamping plate (9).

3. A variable diameter blowout preventer according to claim 2, characterized in that, Each upper flange (8) has multiple trapezoidal positioning grooves (22) symmetrically opened on its bottom surface, and each lower flange (7) has multiple trapezoidal positioning blocks (18) symmetrically installed on its top surface, and each trapezoidal positioning block (18) is locked in the corresponding trapezoidal positioning groove (22).

4. A variable diameter blowout preventer according to claim 3, characterized in that, Each of the locking components includes multiple arc sleeves (11), and the multiple arc sleeves (11) are circumferentially distributed and installed on the top surface of the upper flange (8). Each arc sleeve (11) is slidably connected with an arc plate (12), and one end of each arc plate (12) passes through the corresponding annular retainer (10) and is locked in the adjacent arc sleeve (11). Each arc plate (12) has a bolt (15) installed on its top surface, and each bolt (15) is threaded to the top of the upper flange (8). Each arc sleeve (11) has a through groove (13) on its top surface, and each arc plate (12) has a handle (14) installed on its top surface, and each handle (14) is movably connected in the corresponding through groove (13).

5. A variable diameter blowout preventer according to claim 4, characterized in that, Each of the lower flanges (7) has multiple lower slots (17) symmetrically opened on the bottom surface, and each of the upper flanges (8) has multiple upper slots (16) symmetrically opened on the top surface. Both ends of each U-shaped clamping plate (9) are respectively clamped in the corresponding upper slot (16) and lower slot (17).

6. A variable diameter blowout preventer according to claim 5, characterized in that, Each upper flange (8) has an annular locking block (21) installed on its bottom surface, and each lower flange (7) has an annular groove (19) on its top surface. Each annular groove (19) has a sealing ring (20) installed in it, and each annular locking block (21) abuts against the corresponding sealing ring (20).

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