Blowout prevention blocking structure for petroleum drilling

Abstract

The utility model relates to the technical field of petroleum drilling, in particular to a blowout prevention blocking structure for petroleum drilling, and aims to solve the technical problems that in the prior art, when a drill rod is completely cut off by two shear flashboards, the two shear flashboards are inevitably collided, so that a cutter is damaged, and the service life of the cutter is greatly influenced. Comprising a drill rod, a chassis, a lower pipe, a clamping mechanism, a rotating pipe, an upper pipe, a sealing mechanism, a cutting hydraulic cylinder, a cutting tool and a support lug 10, when a hydraulic cylinder, a support and blowout are twisted, a drill rod is clamped by a lower clamping mechanism to prevent twisting, a plurality of triangular cut-off tools which are uniformly distributed on the circumference synchronously move towards the axis of the drill rod to cut in the drill rod, and when a tool nose of a single cut-off tool cuts in more than 95% of the radius of the drill rod, cut-in is stopped, all the cut-off tools are controlled to twist around the axis of the drill rod to cut off the drill rod. Compared with traditional two flashboards, the cutting resistance of a single cut-off tool is smaller, and the cut-off tool can be protected while the drill rod can be cut off more quickly.

Description

Technical Field

[0001] This utility model relates to the field of oil drilling technology, specifically to an oil drilling blowout prevention and blocking structure. Background Technology

[0002] Petroleum is an essential energy source for modern life and production. During oil drilling and extraction, if the formation fluid pressure exceeds the well pressure, a large amount of formation fluid will rush into the wellbore, causing a blowout. The enormous pressure and shock wave during a blowout can cause serious casualties and property damage. Therefore, blowout prevention devices need to be installed at the wellhead to avoid such accidents.

[0003] The existing blocking mechanism mainly consists of a pair of symmetrical gates, including a shearing gate, a sealing gate, and a hydraulic locking mechanism. The hydraulic locking mechanism drives the shearing gate to cut the drill pipe, and the sealing gate cooperates to seal, so as to completely seal the well and block the blowout.

[0004] However, when the two shear gates completely shear the drill rod, they will inevitably collide, causing damage to the cutting tool and greatly affecting its service life. Utility Model Content

[0005] This invention addresses the technical problem in existing technologies where two shear gates inevitably collide when completely shearing the drill pipe, leading to tool damage and significantly impacting tool life. Therefore, it provides a blowout prevention and blocking structure for oil drilling.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a blowout prevention and blocking structure for oil drilling, comprising: a drill pipe passing through a chassis, the chassis being sealed to a ground base, a lower pipe connected to the upper surface of the chassis, the lower pipe being concentrically arranged with the drill pipe, a clamping mechanism connected to the lower pipe, the clamping mechanism being able to clamp the drill pipe, a rotating pipe being rotatably and sealed to the upper end of the lower pipe, an upper pipe being rotatably and sealed to the upper end of the rotating pipe, a sealing mechanism being connected to the upper end of the upper pipe, the sealing mechanism being connected to the chassis, a fixed end of a cutting hydraulic cylinder being evenly and sealedly connected to the circumference of the rotating pipe, the telescopic end of the cutting hydraulic cylinder being connected to a cutting blade, the cutting blade being located inside the rotating pipe, the cutting hydraulic cylinder controlling multiple cutting blades to add up to 360° when they are joined together, a support lug being connected to the outer surface of the rotating pipe, the support lug being hinged to the telescopic end of a torsion hydraulic cylinder, the fixed end of the torsion hydraulic cylinder being hinged to a support, the support being connected to the chassis.

[0007] Preferably, the clamping mechanism includes a plurality of clamping hydraulic cylinders evenly distributed around the circumference, the fixed end of the clamping hydraulic cylinder is sealed and connected to the lower tube, the telescopic end of the clamping hydraulic cylinder is connected to the clamp, and the inner surface of the clamp is textured.

[0008] Preferably, the sealing mechanism includes a ball valve housing, which is connected to and communicates with the upper pipe. A ball core is sealed inside the ball valve housing, and the ball core shaft end is rotatably connected to the ball valve housing. The ball core shaft end is connected to the output end of the hydraulic motor, and the hydraulic motor is connected to the chassis through a motor bracket.

[0009] Preferably, the ball valve housing is connected to the hydraulic motor via a sleeve bracket.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] During a blowout, the lower clamping mechanism clamps the drill pipe to prevent twisting. Multiple circumferentially distributed triangular cutting blades move synchronously towards the drill pipe axis to cut into the drill pipe. When the tip of a single cutting blade cuts into more than 95% of the drill pipe radius, the cutting stops, and all cutting blades are controlled to twist around the drill pipe axis to cut the drill pipe. Compared with the traditional two-gate system, the cutting resistance of a single cutting blade is smaller, which can cut the drill pipe faster while protecting the cutting blade.

[0012] By replacing the traditional sealing gate with a ball valve, the ball surface of the valve has stronger resistance to bending and deformation compared to the flat plate of the sealing gate, and is less likely to be damaged by well blowout. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0014] Figure 2 This is a schematic cross-sectional view of the structure of this utility model;

[0015] Figure 3 This is a schematic diagram of the structure of the present invention. Figure 2 .

[0016] In the diagram: 1. Drill pipe; 2. Base plate; 3. Lower pipe; 4. Clamping mechanism; 41. Clamping hydraulic cylinder; 42. Clamp; 5. Rotary pipe; 6. Upper pipe; 7. Sealing mechanism; 71. Ball valve housing; 72. Ball core; 73. Hydraulic motor; 74. Motor bracket; 75. Casing bracket; 8. Cutting hydraulic cylinder; 9. Cutting blade; 10. Support lug; 11. Torsion hydraulic cylinder; 12. Support. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] The rotary connection described in this device refers to the axial fixation of the bearing by mounting the bearing on the shaft, with a spring retaining ring groove provided on the shaft or shaft hole, and the rotation achieved by locking the elastic retaining ring in the retaining ring groove; the hinge connection refers to the connection method that allows movement through connecting parts such as hinges, pins, and short shafts.

[0019] The present invention will now be described in detail with reference to the accompanying drawings.

[0020] The following is in conjunction with the appendix Figure 1-3 This embodiment describes a blowout prevention structure for oil drilling, comprising: a drill pipe 1 passing through a chassis 2, the chassis 2 being sealed to a ground base, a lower pipe 3 connected to the upper surface of the chassis 2, the lower pipe 3 being concentrically arranged with the drill pipe 1, a clamping mechanism 4 connected to the lower pipe 3, the clamping mechanism 4 being able to clamp the drill pipe 1, a rotating pipe 5 being rotatably sealed to the upper end of the lower pipe 3, an upper pipe 6 being rotatably sealed to the upper end of the rotating pipe 5, a sealing mechanism 7 being connected to the upper end of the upper pipe 6, the sealing mechanism 7 being connected to the chassis 2, a fixed end of a cutting hydraulic cylinder 8 being evenly distributed and sealed around the circumference of the rotating pipe 5, the telescopic end of the cutting hydraulic cylinder 8 being connected to a cutting blade 9, the cutting blade 9 being located inside the rotating pipe 5, the hydraulic cylinder 8 controlling the multiple cutting blades 9 to add up to 360° when they are joined together, a lug 10 connected to the outer surface of the rotating pipe 5, the lug 10 being hinged to the telescopic end of a torsion hydraulic cylinder 11, the fixed end of the torsion hydraulic cylinder 11 being hinged to a support 12, the support 12 being connected to the chassis 2.

[0021] During normal drilling, drilling fluid carrying cuttings is discharged from the top of the sealing mechanism 7 through the lower pipe 3, the rotating pipe 5, and the upper pipe 6. During a blowout, the lower clamping mechanism 4 clamps the drill pipe 1 to prevent twisting. The cutting hydraulic cylinder 8 controls multiple circumferentially distributed triangular cutting blades 9 to move synchronously towards the axis of the drill pipe 1 and cut into it. When the tip of a single cutting blade 9 cuts into more than 95% of the radius of the drill pipe 1, the cutting stops, and the twisting hydraulic cylinder 11 is extended. The twisting hydraulic cylinder 11 drives the rotating pipe 5 to twist through the lug 10. The rotating pipe 5 drives the cutting blade 9 to twist and cut the drill pipe. Compared with the traditional two-gate system, the cutting resistance of a single cutting blade 9 is smaller, which can cut the drill pipe faster while protecting the cutting blade 9. After cutting, the upper drilling mechanism lifts the upper part of the drill pipe 1, and the sealing mechanism 7 closes, achieving blowout prevention.

[0022] The clamping mechanism 4 includes multiple clamping hydraulic cylinders 41 evenly distributed around the circumference. The fixed end of the clamping hydraulic cylinder 41 is sealed and connected to the lower tube 3. The telescopic end of the clamping hydraulic cylinder 41 is connected to the clamp 42. The inner surface of the clamp 42 is textured.

[0023] During clamping, the clamping hydraulic cylinder 41 controls the extension of the clamp 42, and multiple clamps simultaneously clamp the drill rod 1.

[0024] The sealing mechanism 7 includes a ball valve housing 71, which is connected to and communicates with the upper pipe 6. A ball core 72 is sealed inside the ball valve housing 71. The shaft end of the ball core 72 is rotatably connected to the ball valve housing 71. The shaft end of the ball core 72 is connected to the output end of the hydraulic motor 73. The hydraulic motor 73 is connected to the chassis 2 through the motor bracket 74.

[0025] During normal drilling, drilling fluid carrying rock cuttings is discharged through the gap between the ball core 72 and the drill pipe 1. During a blowout, the down-drilling mechanism lifts the upper part of the drill pipe 1, and the hydraulic motor 73 drives the ball core 72 to rotate, so that the inner hole and the ball valve housing 71 fit together to seal and achieve blowout prevention. Compared with the sealing gate plate, the spherical surface of the ball core 72 has stronger bending and deformation resistance and is not easily damaged by blowout impact.

[0026] The ball valve housing 71 is connected to the hydraulic motor 73 via the sleeve bracket 75.

[0027] Strengthen the connection between the hydraulic motor 73 and the ball valve housing 71 to make the ball valve housing 71 more stable.

[0028] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A blowout prevention and blocking structure for oil drilling, characterized in that: include: A drill rod (1) passes through a chassis (2), which is sealed to the ground base. A lower tube (3) is connected to the upper surface of the chassis (2). The lower tube (3) is concentrically arranged with the drill rod (1). A clamping mechanism (4) is connected to the lower tube (3), which can clamp the drill rod (1). A rotating tube (5) is rotatably and sealed to the upper end of the lower tube (3). An upper tube (6) is rotatably and sealed to the upper end of the rotating tube (5). A closing mechanism (7) is connected to the upper end of the upper tube (6). The closing mechanism (7) is connected to the upper part of the chassis (2). The rotating tube (5) is evenly sealed with the fixed end of the cutting hydraulic cylinder (8). The telescopic end of the cutting hydraulic cylinder (8) is connected to the cutting knife (9). The cutting knife (9) is located inside the rotating tube (5). When the cutting hydraulic cylinder (8) controls multiple cutting knives (9) to be joined together, the knife tip angles are added to 360°. The outer surface of the rotating tube (5) is connected with the support ear (10). The support ear (10) is hinged to the telescopic end of the torsion hydraulic cylinder (11). The fixed end of the torsion hydraulic cylinder (11) is hinged to the support (12). The support (12) is connected to the chassis (2).

2. The oil drilling blowout prevention and blocking structure according to claim 1, characterized in that: The clamping mechanism (4) includes multiple clamping hydraulic cylinders (41) evenly distributed around the circumference. The fixed end of the clamping hydraulic cylinder (41) is sealed and connected to the lower tube (3). The telescopic end of the clamping hydraulic cylinder (41) is connected to the clamp (42). The inner surface of the clamp (42) is textured.

3. The oil well blowout prevention and blocking structure according to claim 1, characterized in that: The sealing mechanism (7) includes a ball valve housing (71), which is connected to and communicates with the upper pipe (6). A ball core (72) is sealed inside the ball valve housing (71). The ball core (72) is rotatably connected to the ball valve housing (71). The ball core (72) is connected to the output end of the hydraulic motor (73). The hydraulic motor (73) is connected to the chassis (2) through the motor bracket (74).

4. The oil drilling blowout prevention and blocking structure according to claim 3, characterized in that: The ball valve housing (71) is connected to the hydraulic motor (73) via a sleeve bracket (75).

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