A step-by-step casing pressurizing device

Abstract

The invention discloses a step-by-step casing pressurizing device, comprising a casing column and a turntable beam, wherein a clamping device is clamped on the outer wall of the casing column, joint supports are symmetrically connected on both sides of the clamping device, a pressurizing oil cylinder is sleeved in each joint support, the bottom of the pressurizing oil cylinder is movably connected to the top of a mounting bracket, the bottom of the mounting bracket is connected to the turntable beam, and the pressurizing oil cylinder is connected to a hydraulic control system. The pressurizing device of the invention solves the problem that the existing pressing method has low pressing force and cannot realize automatic pressing.

Description

Technical Field

[0001] The invention belongs to the technical field of petroleum drilling equipment and relates to a step-by-step casing pressurizing device. Background Art

[0002] In order to meet the requirements of efficient reservoir development, it is often necessary to drill large-displacement horizontal wells or large-displacement inclined vertical wells. As the wellbore trajectory inclination and the length of the horizontal section are greatly increased, the vertical gravity of the casing is greatly reduced in the inclined and horizontal states. Therefore, in order to overcome the friction resistance of the well wall during the casing operation, it is necessary to apply downward pressure to the casing string. At present, the commonly used method is to add a heavy iron block to the casing head at the wellhead through a lifting device to overcome the friction resistance during casing operation, or to dredge the well wall through multiple lifting and lowering operations, which has problems such as cumbersome operation, low downward pressure, high risk, and inability to actively press down. Summary of the invention

[0003] The purpose of the present invention is to provide a step-by-step casing pressurizing device, which solves the problem that the pressing force of the existing pressing method is small and active pressing cannot be achieved.

[0004] The technical solution adopted by the present invention is a step-by-step casing pressurizing device, including a casing column and a turntable beam. The outer wall of the casing column is clamped with a clamping device, and the two sides of the clamping device are symmetrically connected with joint supports. A pressurizing cylinder is sleeved in each joint support, and the bottom of the pressurizing cylinder is movably connected to the top of the mounting bracket, the bottom of the mounting bracket is connected to the turntable beam, and the pressurizing cylinder is connected to a hydraulic control system.

[0005] The present invention is also characterized in that

[0006] The clamping device includes a connecting disk, a pair of connecting arms are symmetrically arranged on the side wall of the connecting disk, a clamping body is sleeved inside the connecting disk, and clamp teeth are sleeved inside the clamping body. The clamp teeth are clamped with the casing column, and the pair of connecting arms are connected to the joint support.

[0007] An opening is arranged on one side wall of the connection disk, and two ends of the opening are connected to the connection piece through a pin shaft, so that the connection disk and the connection piece form a circle.

[0008] The two side walls of the connection plate between a pair of connection arms are both provided with openings, and both ends of each opening are connected to the connection piece through a pin shaft, and the connection plate and the two connection pieces form a circle.

[0009] The joint support includes a square support, a pressurized hydraulic cylinder is provided inside the support, connecting arm pins are symmetrically arranged on a group of opposite side walls in the support, the connecting arm pins are movably connected to the connecting arms, and another group of opposite side walls in the support are movably connected to the cylinder barrel of the pressurized hydraulic cylinder through the cylinder pins.

[0010] A spherical bearing is arranged at the end of the cylinder rod in the pressurized oil cylinder, and the spherical bearing is movably connected to the top of the mounting bracket.

[0011] The bottom of the mounting bracket is connected to the turntable beam through an ear plate and a pin shaft.

[0012] The beneficial effect of the present invention is that the step-by-step casing pressurizing device of the present invention adopts a hydraulic step-by-step downward pressure method to be able to press down the casing above the drilling platform at any time when encountering resistance at any height during the casing lowering operation, so that the casing string downhole can smoothly pass through the blocking point. The structure is reasonable and the operation is convenient, especially when it is applied to the casing lowering operation of complex wells such as horizontal wells and directional wells, the benefits are remarkable. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a step-by-step casing pressurizing device of the present invention;

[0014] Figure 2 It is a structural schematic diagram of a clamping device in a step-by-step casing pressurizing device of the present invention;

[0015] Figure 3 It is a structural schematic diagram of a connecting arm in a step-by-step casing pressurizing device of the present invention;

[0016] Figure 4 It is a structural schematic diagram of a joint support in a step-by-step casing pressurizing device of the present invention;

[0017] Figure 5 It is a structural schematic diagram of a support in a step-by-step casing pressurizing device of the present invention;

[0018] Figure 6 It is a structural schematic diagram of a pressurizing cylinder in a step-by-step casing pressurizing device of the present invention;

[0019] Figure 7 It is a structural schematic diagram of a mounting bracket in a step-by-step casing pressurizing device of the present invention;

[0020] Figure 8 It is a schematic diagram of a step-by-step casing pressurizing device of the present invention in a pressing end state;

[0021] Fig. 9 It is a schematic diagram of the root cleaning state of a step-by-step casing pressurizing device of the present invention.

[0022] In the figure, 1. top drive device, 2. lifting ring, 3. casing elevator, 4. casing column, 5. pressurized cylinder, 6. joint support, 7. clamping device, 8. mounting bracket, 9. turntable, 10. turntable beam, 11. hydraulic control system, 12. connecting arm, 13. clamping body, 14. clamp teeth, 15. support, 16. cylinder pin, 17. connecting arm pin, 18. cylinder barrel, 19. cylinder rod, 20. joint bearing, 21. connecting plate, 22. connecting piece. DETAILED DESCRIPTION

[0023] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] The present invention provides a step-by-step casing pressurizing device, the structure of which is as follows: Figure 1 As shown, it includes a casing column 4 and a turntable beam 10. The outer wall of the casing column 4 is clamped with a clamping device 7. The two sides of the clamping device 7 are symmetrically connected with joint supports 6. A pressurized oil cylinder 5 is sleeved in each joint support 6. The bottom of the pressurized oil cylinder 5 is movably connected to the top of the mounting bracket 8. The bottom of the mounting bracket 8 is connected to the turntable beam 10 through an ear plate and a pin shaft. The pressurized oil cylinder 5 is connected to a hydraulic control system 11. The turntable beam 10 is fixed under the turntable surface. The hydraulic control system 11 is used to control the downward pressure action and the clamping device 7 to clamp the casing column 4. The hydraulic power is directly provided by the hydraulic station of the drilling rig. The hydraulic control system 11 is provided with a balancing valve, a hydraulic lock, a speed regulating valve, and an overflow valve to ensure reliable operation of the hydraulic mechanism.

[0025] like Figure 2 and Figure 3 As shown, the clamping device 7 includes a connecting disk 21, and a pair of connecting arms 12 are symmetrically arranged on the side wall of the connecting disk 21. A clamping body 13 is sleeved inside the connecting disk 21, and a clamping tooth 14 is sleeved inside the clamping body 13. The clamping tooth 14 is clamped with the casing column 4, and the pair of connecting arms 12 are connected to the joint support 6. The clamping body 13 is a three-petal type or a two-half type, and the outer wall surface of the clamping tooth 14 is a conical surface. The connecting disk 21 is a side-opening type or a double-opening type, which is convenient for the casing column 4 to enter and exit. When the pressurized oil cylinder 5 moves downward, it drives the connecting disk to move downward, and the wall surface of the clamping body 13 and the clamping tooth 14 are clamped. When clamping, the clamping device 7 and the casing column 4 shall not move under the maximum load; when the pressurized oil cylinder 5 moves upward, it drives the connecting disk to move upward, and the wall surface of the clamping body 13 and the clamping tooth 14 are loosened. In the loosened state, the clamping device 7 can move up and down along the casing column 4.

[0026] The specific structure of the side-opening type is as follows: an opening is provided on one side wall of the connection disk 21 , and both ends of the opening are connected to the connection member 22 through a pin shaft, and the connection disk 21 and the connection member 22 form a circle.

[0027] The double-opening specific structure is as follows: the connection plate 21 is located between a pair of connecting arms 12 and has openings on both side walls, and both ends of each opening are connected to the connecting piece 22 through a pin shaft, and the connection plate 21 and the two connecting pieces 22 form a circle.

[0028] like Figure 4 and Figure 5 As shown, the joint support 6 includes a square support 15, a pressurized hydraulic cylinder 5 is sleeved in the support 15, a connecting arm pin 17 is symmetrically arranged on a group of opposite side walls in the support 15, the connecting arm pin 17 is movably connected to the connecting arm 12, and another group of opposite side walls in the support 15 is movably connected to the cylinder 18 of the pressurized cylinder 5 through the cylinder pin 16, the cylinder pin 16 and the connecting arm pin 17 are arranged in a 90-degree direction and can both rotate, so that the inside of the clamping device 7 is fixed to the casing column 4, and the connecting arm 12 can rotate synchronously with the pressurized hydraulic cylinders 5 on both sides.

[0029] like Figure 6 The end of the cylinder rod 19 in the pressurizing cylinder 5 is provided with a spherical bearing 20 , and the spherical bearing 20 is movably connected to the top of the mounting bracket 8 , so that the pressurizing cylinder and the casing string 4 can be tilted synchronously.

[0030] The working principle of a step-by-step casing pressurizing device of the present invention is as follows: firstly, the mounting bracket 8 is connected to the turntable beam 10, the lower ends of the cylinder rods 19 of the two pressurizing oil cylinders 5 are connected to the mounting bracket 8, and the two joint supports 6 are respectively connected to the cylinder pins 16 of the cylinder barrels 18 of the two pressurizing oil cylinders 5; secondly, the casing column 4 is suspended below the casing elevator 3, the pneumatic winch of the drilling rig is used to lift the clamping device 7, and the clamping device 7 is mounted on the casing column 4 near the drilling table; finally, the connecting arms 12 on both sides of the clamping device 7 are connected to the pressurizing oil cylinder 5 through the joint supports 6;

[0031] The step-down process is: Figure 1 As shown, ① the hydraulic control system 11 controls the pressurized hydraulic cylinder 5 to move downward, and the clamping device 7 clamps the casing string 4, that is, the initial state of downward pressure; Figure 8 As shown, ② the hydraulic control system 11 operates the two pressurized oil cylinders 5 to retract synchronously. Since the cylinder barrel 18 of the pressurized oil cylinder 5 is fixedly connected to the clamping device 7, the casing string 4 moves downward to realize the downward pressure of the casing string 4, that is, the downward pressure termination state; ③ the hydraulic control system 11 controls the pressurized oil cylinder 5 to move upward, the clamping device 7 is released, and the two pressurized oil cylinders 5 extend synchronously to lift the clamping device 7. The lifting distance and the downward distance are the stepping distance H1 (less than the stroke of the pressurized oil cylinder 5); ④ repeat steps ①, ②, and ③ in sequence until the last casing string 4; Fig. 9As shown, ⑤ the lifting distance H1 is adjusted according to the remaining length of the last casing string 4, and finally the last casing string 4 is pressed down to the lowest position, that is, the root cleaning state, and the root cleaning height H2 is limited by the height of the clamping device 7 and the casing elevator 3.

[0032] The present invention provides a step-by-step casing pressurizing device, which has the function of adaptively adjusting the deflection or offset of a wellhead casing string 4. The deflection process is specifically as follows: when the wellhead casing string 4 deflects forward or backward, the joint bearing 20 of the pressurizing oil cylinder 5 rotates forward or backward with the wellhead center as the rotation point, so that the clamping device 7, the joint support 6 and the pressurizing oil cylinder 5 deflect forward or backward with the casing string 4, so the allowable forward and backward deflection angles of the wellhead casing string 4 are the allowable angles of the joint bearing 20; when the casing string 4 deflects left or right, the clamping device 7 needs to deflect synchronously with the casing string 4, and the connecting arm pin 17 of the joint support 6 makes the clamping device 7 rotate and deflect left or right with the casing string 4. At this time, the deflection rotation point is the center point of the clamping device 7, and the joint bearing 20 of the pressurizing oil cylinder 5 can rotate left or right, so the clamping device 7 can rotate left or right with the wellhead center as the rotation point; the deflection of the casing string 4 in other directions is achieved by a combination of forward and backward deflection and left and right deflection. The displacement of the casing string 4 is achieved by deflecting it at a certain angle, that is, the minimum displacement distance is the sine value of the length of the pressurizing cylinder 5 in the end state of downward pressure.

Claims

1. A step-by-step casing pressurizing device, comprising a casing column (4) and a turntable beam (10), characterized in that: The outer wall of the casing column (4) is clamped with a clamping device (7), and the two sides of the clamping device (7) are symmetrically connected with joint supports (6), and each joint support (6) is sleeved with a pressurizing cylinder (5), the bottom of the pressurizing cylinder (5) is movably connected to the top of the mounting bracket (8), the bottom of the mounting bracket (8) is connected to the turntable beam (10), and the pressurizing cylinder (5) is connected to a hydraulic control system (11); The clamping device (7) comprises a connecting disk (21), a pair of connecting arms (12) are symmetrically arranged on the side wall of the connecting disk (21), a clamping body (13) is sleeved inside the connecting disk (21), a clamping tooth (14) is sleeved inside the clamping body (13), the clamping tooth (14) is clamped with the casing column (4), and the pair of connecting arms (12) are both connected to the joint support (6); The joint support (6) comprises a square support (15), wherein a pressurizing cylinder (5) is sleeved in the support (15), and a connecting arm pin (17) is symmetrically arranged on a group of opposite side walls in the support (15), wherein the connecting arm pin (17) is movably connected to the connecting arm (12), and another group of opposite side walls in the support (15) is movably connected to the cylinder barrel (18) of the pressurizing cylinder (5) via the cylinder pin (16).

2. A step-by-step casing pressurizing device according to claim 1, characterized in that: An opening is provided on one side wall of the connection disk (21), and both ends of the opening are connected to a connection piece (22) via a pin shaft, and the connection disk (21) and the connection piece (22) form a circle.

3. A step-by-step casing pressurizing device according to claim 1, characterized in that: The connection disk (21) is provided with openings on two side walls located between a pair of connection arms (12), and both ends of each opening are connected to a connection piece (22) via a pin shaft, and the connection disk (21) and the two connection pieces (22) form a circle.

4. A step-by-step casing pressurizing device according to claim 1, characterized in that: A joint bearing (20) is provided at the end of the cylinder rod (19) in the pressurized oil cylinder (5), and the joint bearing (20) is movably connected to the top of the mounting bracket (8).

5. The step-by-step casing pressurizing device according to claim 1, characterized in that: The bottom of the mounting bracket (8) is connected to the turntable beam (10) via a lug plate and a pin shaft.

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