Well control device for plug drilling operation

Abstract

The utility model provides a well control device for plug drilling operation. The well control device comprises an installation frame, a walking beam, a buffering assembly and an anti-jacking slip. Wherein the mounting frame is used for being mounted above a wellhead, and a mounting beam is arranged on the mounting frame; the anti-jacking slip is arranged on the walking beam, the anti-jacking slip is used for surrounding the rotary drill collar, clamping teeth are arranged on the inner side of the anti-jacking slip, and the tooth shape of the clamping teeth is matched with the spiral structure of the drill collar; the buffer assembly is arranged between the mounting beam and the walking beam, and the buffer assembly is used for relieving pressure impact formed by relative movement of the walking beam and the mounting beam. The well control device has the advantages that damage to the well control device caused by entrapment pressure impact can be reduced, and well control safety is improved.

Description

Technical Field

[0001] This utility model relates to the field of oilfield equipment technology, and in particular to a well control device for drilling plug operations. Background Technology

[0002] The oilfield attaches great importance to the management of long-term shut-in wells and has established a number of strict management systems, focusing on the centralized management of the following three types of wells: first, wells located in urban planning areas, residential areas, and office areas; second, wells near water bodies and scenic areas; and third, wells with significant safety hazards that could lead to serious social impact. Most long-term shut-in wells suffer from years of neglect and lack of maintenance, resulting in severe damage to the wellheads and the accumulation of various debris within the wells due to prolonged openness. Furthermore, some wells have been temporarily sealed by filling them with cement, leading to pressure buildup during years of closure. This creates significant well control risks during drilling and flushing to remove blockages, and a blowout could result in substantial economic losses and safety accidents.

[0003] Existing well control devices for drilling plug operations use workover rig rotary tables or screw drills. When using a workover rig rotary table, the tubing string is constantly rotating during the drilling process, so conventional well control blowout preventers cannot be closed in real time. Furthermore, conventional top-stop slips require manual closure in the event of a blowout, resulting in reaction time, operation time, and hydraulic transmission delays. At the moment of penetration at the wellhead, the high trapping pressure may suddenly impact the drill string, causing the wellhead to become uncontrollable and the tubing string to fly out. This is impossible to control effectively by humans. Moreover, due to the excessive impact force at the moment of penetration, even if top-stop measures are implemented, damage to the slips and equipment will still occur.

[0004] Therefore, it is necessary to study a well control device for drilling plug operations to solve the above problems or mitigate their impact. Utility Model Content

[0005] This invention provides a well control device for drilling plug operations, which uses anti-top slips to quickly clamp the drill collar and uses a buffer component to mitigate the impact of trap pressure, thereby effectively solving the above problems or mitigating the effects of the above problems.

[0006] The well control device for drilling plug operations of this utility model may include a mounting frame, a traveling beam, a buffer assembly, and anti-top slips; wherein,

[0007] The mounting frame is used for installation above the wellhead, and the mounting frame is provided with a mounting beam;

[0008] The anti-overhead slip is mounted on the moving beam. The anti-overhead slip is used to surround the rotating drill collar. The inner side of the anti-overhead slip is provided with locking teeth, and the tooth shape of the locking teeth matches the spiral structure of the drill collar.

[0009] The buffer assembly is disposed between the mounting beam and the movable beam, and the buffer assembly is used to mitigate the pressure impact caused by the relative movement of the movable beam and the mounting beam.

[0010] In one embodiment, the locking tooth has a spiral sawtooth structure, and the locking tooth includes at least a connected upper inclined surface and a lower inclined surface, wherein the angle of inclination of the upper inclined surface to the horizontal direction is 50° to 70°, and the angle of inclination of the upper inclined surface to the horizontal direction is 10° to 20°.

[0011] In one embodiment, the anti-top slip is a pneumatic slip, and the anti-top slip is connected to an air supply device; the air supply device drives the jaws to surround the drill collar by air pressure.

[0012] In one embodiment, a pneumatic pressure regulating valve and a first control valve are provided between the anti-top clamp and the air supply device. The pneumatic pressure regulating valve is used to regulate the air supply pressure, and the first control valve is used to drive the clamp to engage or disengage by controlling the direction of air inlet and outlet.

[0013] In one embodiment, the buffer assembly includes at least two buffer cylinders, the fixed end of the buffer cylinder is fixedly connected to the mounting beam, the output end of the buffer cylinder is fixedly connected to the floating beam, and the two buffer cylinders extend and retract synchronously.

[0014] In one embodiment, the buffer cylinder is connected to an oil supply device, and a second control valve and a two-way hydraulic lock are provided between the oil supply device and the buffer cylinder.

[0015] In one embodiment, the mounting frame includes multiple supports, each support including adjustable legs for mounting at a wellhead location, and a mounting beam is fixedly disposed between two adjacent adjustable legs.

[0016] In one embodiment, the adjustable outrigger includes a movable rod and a connecting sleeve, wherein the movable rod is movably inserted into the connecting sleeve and fixed by a limiting member.

[0017] In one embodiment, the mounting bracket further includes a support column extending upward from the adjustable outrigger, and a fixing clamp is provided on the support column for clamping the cylinder body of the fixed buffer cylinder.

[0018] In one embodiment, an operating platform is fixedly supported on the support column, and ladders and escape slides are respectively provided on opposite sides of the operating platform.

[0019] The well control device for drilling plug operations provided by this utility model has at least the following advantages compared with the prior art:

[0020] This utility model discloses a well control device for drilling plug operations. A structurally matched anti-overhead slip surrounds the drill collar, preventing interference with its rotation. Furthermore, the anti-overhead slip quickly clamps the drill collar during the drilling plug operation. When the pressure impacts the drill collar during penetration, causing relative movement between the anti-overhead slip and the traveling beam relative to the mounting beam, the buffer assembly between the mounting beam and the traveling beam mitigates the pressure impact, reducing damage to the anti-overhead slip and the traveling beam. This reduces or prevents damage to the well control device, improving its safety. Attached Figure Description

[0021] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the well control device according to an embodiment of the present invention;

[0023] Figure 2 This is another structural schematic diagram of the well control device according to an embodiment of the present invention;

[0024] Figure 3 This is a structural schematic diagram of the anti-top clamping drill collar according to an embodiment of the present utility model;

[0025] Figure 4 This is a schematic diagram of the anti-top clamp connection control according to an embodiment of the present utility model;

[0026] Figure 5 This is a schematic diagram of the connection and control structure of the buffer cylinder according to an embodiment of the present utility model;

[0027] Figure 6 These are cross-sectional and sectional views of three anti-top clamps with different inner hole sizes according to embodiments of this utility model.

[0028] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not drawn to scale.

[0029] Figure label:

[0030] 1. Mounting bracket; 11. Support column; 111. Adjustable support leg; 1111. Movable rod; 1112. Connecting sleeve;

[0031] 1113. Limiting component; 112. Lower crossbeam; 113. Support column; 114. Protective plate; 115. Upper crossbeam;

[0032] 116. Fixing clamps; 12. Operating platform; 121. Guardrail; 122. Control panel; 123. Ladder;

[0033] 124. Escape slide; 13. Mounting beam; 2. Anti-top clamp; 21. Clamping teeth; 22. Pneumatic pressure regulating valve;

[0034] 23. First control valve; 24. Air supply equipment; 3. Drill collar; 4. Buffer assembly; 41. Buffer cylinder;

[0035] 42. Second control valve; 43. Two-way hydraulic lock; 44. Overflow valve; 45. Oil supply equipment; 5. Traveling beam; 6. Rotary blowout preventer; 7. Well-controlled blowout preventer; 8. Wellhead four-way valve. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings.

[0037] like Figures 1 to 3 As shown, the well control device for drilling plug operations of this utility model may include a mounting frame 1, a traveling beam 5, a buffer assembly 4, and anti-overhead slips 2; wherein, the mounting frame 1 is used to be installed above the wellhead, and the mounting frame 1 is provided with a mounting beam 13; the anti-overhead slips 2 are disposed on the traveling beam 5, and the anti-overhead slips 2 are used to surround the rotating drill collar 3, and the inner side of the anti-overhead slips 2 is provided with a locking tooth 21, and the tooth shape of the locking tooth 21 matches the helical structure of the drill collar 3; the buffer assembly 4 is disposed between the mounting beam 13 and the traveling beam 5, and the buffer assembly 4 is used to alleviate the pressure impact formed by the relative movement between the traveling beam 5 and the mounting beam 13.

[0038] Specifically, the mounting frame 1 is fixedly installed above the wellhead as the mounting base for the well control device, and the mounting frame 1 has a fixedly installed mounting beam 13. A traveling beam 5 is provided above the mounting beam 13, and the mounting beam 13 is connected to the traveling beam 5 through a buffer assembly 4. The anti-overhead slip 2 is fixedly installed on the traveling beam 5. The anti-overhead slip 2 can wrap around the rotating drill collar 3 through the jaws 21, and the tooth shape that matches the external helical structure of the drill collar 3 allows the drill collar 3 to rotate within the anti-overhead slip 2. At the same time, when the drill plug penetrates and the pressure of the trap impacts the drill collar 3, the jaws 21 self-tighten through the matching helical structure between them, achieving rapid clamping to prevent the drill collar 3 from flying out. Furthermore, at the moment of drilling through, the trap pressure impacts the drill collar 3, which in turn acts on the anti-top slip 2 and the moving beam 5 fixed to the anti-top slip 2. Under this impact, the anti-top slip 2 and the moving beam 5 are about to move relative to the mounting beam 13. At this time, the buffer component 4 begins to act to absorb the impact on the moving beam 5 and the anti-top slip 2, reducing the damage caused by the trap pressure impact to the anti-top slip 2 and the moving beam 5.

[0039] Overall, the well control device for drilling plug operations of this utility model uses a structurally matched anti-overhead slip 2 that surrounds the drill collar 3, without affecting the rotation of the drill collar 3. Furthermore, the anti-overhead slip 2 can quickly clamp the drill collar 3 at the moment of drilling penetration. At the moment of drilling penetration, the pressure impacts the drill collar 3 and causes the anti-overhead slip 2 and the traveling beam 5 to move relative to the mounting beam 13. The buffer component 4 between the mounting beam 13 and the traveling beam 5 can alleviate the pressure impact and reduce damage to the anti-overhead slip 2 and the traveling beam 5, thereby reducing or preventing damage to the well control device and improving the safety of well control.

[0040] In one example, such as Figure 3 As shown, the locking tooth 21 has a spiral sawtooth structure, and the locking tooth 21 includes at least a connected upper inclined surface and a lower inclined surface. The inclination angle between the upper inclined surface and the horizontal direction is 50° to 70°, and the inclination angle between the upper inclined surface and the horizontal direction is 10° to 20°.

[0041] Specifically, the locking mechanism can be composed of two symmetrically distributed semi-circular locking teeth 21 or four quarter-circular locking teeth 21. Each locking tooth 21 is composed of multiple evenly distributed spiral serrated structures, each serrated structure including an upper inclined surface and a lower inclined surface. The angle of inclination of the upper inclined surface to the horizontal direction is 50° to 70°, for example, 50°, 60° or 70°. The angle of inclination of the lower inclined surface to the horizontal direction is 10° to 20°, for example, 10°, 15° or 20°. The tooth profile of the chuck 21, which has a spiral sawtooth structure, is the same as that of the drill collar 3. The anti-overhead slip 2 surrounds the drill collar 3 and forms a conical self-tightening design through the upper and lower inclined surfaces. The anti-overhead slip 2 has a moderate clamping force on the drill collar 3, ensuring that the drill collar 3 can rotate and descend during operation. At the same time, it can also clamp instantly when the drill collar 3 suddenly moves upward. Due to the self-tightening effect of the conical surface, the greater the upward force of the drill collar 3, the tighter the anti-overhead slip 2 will clamp.

[0042] More specifically, the pitch between two adjacent serrated structures of the clamp 21 is 6–10 mm, for example, 6 mm, 8 mm, or 10 mm. The surface of the serrated structure of the clamp 21 is carburized and quenched to HRC58-62, with a carburized layer of 0.8–1.5 mm. The clamp 21 undergoes heat treatment before machining. The inner hole size of the anti-top clamp 2 is available in various sizes, such as… Figure 6 As shown, from top to bottom, there are cross-sectional and sectional views of the anti-top slip 2 with inner hole dimensions of 60.2mm, 72.8mm and 88.8mm respectively. This allows the anti-top slip 2 to be applicable to drill collars 3 of different specifications, thereby improving the applicability of the well control device.

[0043] Furthermore, the inclination angle between the upper inclined surface and the horizontal direction is 60°, and the inclination angle between the upper inclined surface and the horizontal direction is 15°. The pitch between two adjacent sawtooth structures of the locking tooth 21 is 8mm.

[0044] In one example, such as Figure 4 As shown, the anti-top slip 2 is a pneumatic slip, and the anti-top slip 2 is connected to an air supply device 24; the air supply device 24 drives the jaw 21 to surround the drill collar 3 by air pressure.

[0045] Specifically, the anti-top slip 2 is a pneumatic anti-top slip, which is fixedly connected to the moving beam 5 by bolts. The anti-top slip 2 is externally connected to an air supply device 24, which provides power to the anti-top slip 2, thereby controlling the anti-top slip 2 to clamp the drill collar 3. The anti-top slip 2 includes a cylinder for driving the jaws 21 to open and close. The cylinder is connected to the air supply device 24. It should be noted that the anti-top slip 2 is equipped with a cylinder and is opened and closed by the cylinder, which is prior art, and the specific structure is well known to those skilled in the art, and will not be described in detail here. For example, Chinese utility model patent with publication number CN204436287U discloses a pneumatic anti-top slip for well workover operations.

[0046] Furthermore, the anti-jacking force of the anti-jacking slip 2 can be 70t, and the air pressure can be controlled within the range of 0.2 to 0.8 MPa. The air supply equipment 24 can be an air compressor.

[0047] In one example, such as Figure 4 As shown, a pneumatic pressure regulating valve 22 and a first control valve 23 are provided between the anti-top clamp 2 and the air supply device 24. The pneumatic pressure regulating valve 22 is used to regulate the air supply pressure, and the first control valve 23 is used to drive the clamp 21 to engage or disengage by controlling the direction of air inlet and outlet.

[0048] Specifically, a pneumatic pressure regulating valve 22 is installed between the anti-top slip 2 and the air supply device 24. The pneumatic pressure regulating valve 22 controls the pressure of the air supplied by the air supply device 24 to the cylinder of the anti-top slip 2, that is, controls and adjusts the closing pressure of the anti-top slip 2, so that the clamping force of the anti-top slip 2 around the drill collar 3 is moderate. A first control valve 23 is also provided between the pneumatic pressure regulating valve 22 and the anti-top slip 2. The first control valve 23 controls the direction of air supply from the air supply device 24 to the cylinder of the anti-top slip 2, so that the cylinder can be driven and controlled in both directions, thereby enabling the anti-top slip 2 to open and close.

[0049] Furthermore, the first control valve 23 can be a three-position four-way pneumatic valve. The A and B ports of the first control valve 23 are respectively connected to the rod chamber and rodless chamber of the cylinder. The air inlet of the first control valve 23 is connected to the air supply device 24, and the air outlet of the first control valve 23 can be directly discharged.

[0050] In one example, such as Figure 1 and Figure 2The buffer assembly 4 includes at least two buffer cylinders 41. The fixed end of the buffer cylinder 41 is fixedly connected to the mounting beam 13, and the output end of the buffer cylinder 41 is fixedly connected to the floating beam 5. The two buffer cylinders 41 extend and retract synchronously.

[0051] Specifically, both the mounting beam 13 and the traveling beam 5 are horizontally arranged, and the two buffer cylinders 41 are vertically arranged and symmetrically distributed about the central axis of the drill collar 3. The buffer cylinders 41 are fixedly installed on the mounting beam 13 through the fixed end and fixedly connected to the traveling beam 5 through the output end, so that the buffering extension and contraction of the two buffer cylinders 41 are synchronized. In this way, when the traveling beam 5 is subjected to the impact of the closing pressure and wants to move relative to the mounting beam 13, the impact force can be absorbed by the buffer cylinders 41, so as to reduce the damage of the closing pressure impact to the anti-top slip 2 and the traveling beam 5.

[0052] In one example, such as Figure 5 As shown, the buffer cylinder 41 is connected to an oil supply device 45, and a second control valve 42 and a two-way hydraulic lock 43 are provided between the oil supply device 45 and the buffer cylinder 41.

[0053] Specifically, a second control valve 42 is provided between the buffer cylinder 41 and the oil supply device 45. The second control valve 42 controls the direction of oil supply from the oil supply device 45 to the buffer cylinder 41, enabling the buffer cylinder 41 to extend and retract bidirectionally. This allows the buffer cylinder 41 to adjust the positions of the sliding beam 5 and the anti-top slip 2 according to actual needs, adapting to different environments. The second control valve 42 can be a three-position four-way control valve. Its A and B ports are connected to the rod-side and rodless-side chambers of the buffer cylinder 41, respectively. The inlet and outlet ports of the second control valve 42 are connected to the oil supply device 45 via pipelines. The oil supply device 45 can be a hydraulic pump.

[0054] A bidirectional hydraulic lock 43 is also provided between the second control valve 42 and the buffer cylinder 41. The bidirectional hydraulic lock 43 is connected to both the rodless chamber and the rod chamber of the buffer cylinder 41. The bidirectional hydraulic lock 43 enables the inlet and outlet oil circuits to be connected when the oil supply device 45 supplies oil to the buffer cylinder 41, and simultaneously blocks the oil flow in both chambers of the buffer cylinder 41 when the oil supply stops, thus achieving bidirectional locking. In this way, the bidirectional hydraulic lock 43 can lock the position of the buffer cylinder 41, that is, fix the position of the floating beam 5 and the anti-top slip 2, preventing them from moving accidentally due to external forces or load changes, thereby improving the safety and stability of the well control device.

[0055] Furthermore, the rod chamber of the buffer cylinder 41 is connected to an overflow valve 44, and the overflow port of the overflow valve 44 is connected to the system return oil circuit, so that the overflow oil flows back to the oil tank.

[0056] Specifically, a pilot-operated relief valve 44 is installed on the pipeline connecting the rod chamber of the buffer cylinder 41 and the bidirectional hydraulic lock 43. The overflow port of the relief valve 44 is connected to the system return oil circuit. In this way, when the drill collar 3 suddenly rises due to the pressure of the trap, it drives the anti-top slip 2, the traveling beam 5 and the two rod piston rods to rise simultaneously. The hydraulic oil in the rod chamber is squeezed and the pressure rises to the set value. Then the relief valve 44 opens and slowly releases the hydraulic pressure, causing the piston of the buffer cylinder 41 to rise slowly, thereby achieving a buffering effect and effectively protecting the well control device.

[0057] Furthermore, the buffer cylinder 41 can be a special heavy-duty cylinder with a stroke of 500 mm, a rated pressure of 21 MPa, and a driving oil pressure range of 0–21 MPa. The buffer cylinder 41 can be fixedly connected to the mounting beam 13 by 16 M20×70 fully threaded 12.9 grade bolts, and is equipped with a corresponding number of spring washers and M20 nuts.

[0058] In one example, as shown in Figure 2, the mounting frame 1 includes multiple supports 11, each support 11 including adjustable legs 111 for mounting at a wellhead location, and a mounting beam 13 is fixedly disposed between two adjacent adjustable legs 111.

[0059] Specifically, the mounting frame 1 may include four support columns 11, which are arranged in a rectangular structure with a side length of 1530mm. The lower part of each support column 11 is an adjustable support leg 111. Figure 2 The two adjacent adjustable outriggers 111 are bolted together with lower crossbeams 112, and mounting beams 13 are fixedly connected between the two lower crossbeams 112 on the left and right sides. In this way, the height of the well control device can be adjusted according to the actual situation through the adjustable outriggers 111.

[0060] Furthermore, the lower crossbeam 112 and the mounting beam 13 are fixedly connected by eight M20×70 fully threaded 12.9 grade bolts, and are equipped with a corresponding number of spring washers and M20 nuts. A protective plate 114 with a height of 560mm is fixedly installed on the outer wall of the lower crossbeam 112. During transportation, the adjustable outriggers 111 are first retracted to the upper side of the protective plate 114. The protective plate 114 provides support during the equipment's lowering process, preventing the adjustable outriggers 111 from bending under stress.

[0061] In one example, such as Figure 2 As shown, the adjustable outrigger 111 includes a movable rod 1111 and a connecting sleeve 1112. The movable rod 1111 and the connecting sleeve 1112 are movably connected and fixed by a limiting member 1113.

[0062] Specifically, the limiting member 1113 can be a pin or a shaft. Both the movable rod 1111 and the connecting sleeve 1112 have multiple through holes along their length. The size of the through holes matches that of the limiting member 1113. The limiting member 1113 can pass through the corresponding through holes on the connecting sleeve 1112 and the movable rod 1111 to limit the height of the adjustable support leg 111. Furthermore, the lower end of the movable rod 1111 is provided with a foot, which is in fixed contact with the ground.

[0063] In one example, such as Figure 2 As shown, the mounting bracket 1 also includes an adjustable support column 113 extending upward from the support leg 111. The support column 113 is provided with a fixing clamp 116, which is used to clamp the cylinder body of the fixed buffer cylinder 41.

[0064] Specifically, the upper part of the support column 11 is a support column 113, which can be fixedly connected to the lower crossbeam 112 by bolts, such as... Figure 2 The upper crossbeam 115 is connected to the front and rear support columns 113 by fixing bolts. The upper crossbeam 115 is fixedly installed with fixing clamps 116. The fixing clamps 116 are used to clamp the cylinder body of the fixed buffer cylinder 41 to straighten the buffer cylinder 41 and keep it upright.

[0065] Furthermore, the fixing clamp 116 includes two arc-shaped structures, one of which is fixedly connected to the upper crossbeam 115, and the two arc-shaped structures are fixedly connected by bolts to cooperate in clamping the cylinder body of the buffer cylinder 41.

[0066] In one example, such as Figure 2 As shown, an operating platform 12 is fixedly supported on the support column 113, and a ladder 123 and an escape slide 124 are respectively provided on the opposite sides of the operating platform 12.

[0067] Specifically, an operating platform 12 is fixedly installed on the top of the support column 113, facilitating drilling operations for the operator. The operating platform 12 is surrounded by guardrails 121 to increase operational safety, and control panels 122 for operating various equipment are fixedly installed on the guardrails 121. A ladder 123 is fixedly installed on one side of the operating platform 12 for easy access. An escape slide 124 is fixedly installed on the other side of the operating platform 12, allowing operators to evacuate promptly in case of malfunction, preventing accidents.

[0068] In one example, the mounting beam 13 is also equipped with a rotary blowout preventer 6 that mates with the drill collar 3. The rated static sealing pressure of the rotary blowout preventer 6 is 30 MPa, and its rated dynamic sealing pressure is 20 MPa. A through hole with an inner diameter of 186 mm is provided on the mounting beam 13 for connecting the rotary blowout preventer 6. Below the rotary blowout preventer 6, a well control blowout preventer 7 and a wellhead cross-connector 8 can also be sequentially installed on the mounting beam 13 to further improve the safety of the well control system.

[0069] To better understand the above embodiments, the working process of the well control device of this utility model will be further described below with reference to the accompanying drawings.

[0070] The self-tightening process of the anti-top slip 2:

[0071] During operation, after the air supply device 24 receives air, it first enters the pneumatic pressure regulating valve 22, and then the first control valve 23 (a three-position four-way pneumatic rotary valve). The air then connects to the rod-side and rodless-side chambers of the cylinder of the anti-overhead slip 2 through the A / B ports of the first control valve 23. The pneumatic pressure regulating valve 22 adjusts the closing pressure of the anti-overhead slip 2, ensuring that the anti-overhead slip 2 grips the drill collar 3 with appropriate force. Because the jaws 21 of the anti-overhead slip 2 are designed with downward-sloping teeth (e.g., tilted at 60°), and the grip between the anti-overhead slip 2 and the drill collar 3 is a conical self-tightening design, the appropriate gripping force ensures the downward movement and rotation of the drill collar 3. Simultaneously, it can instantly grip when the drill collar 3 suddenly moves upward. Due to the self-tightening effect of the conical self-tightening design, the greater the upward force of the drill collar 3, the tighter the anti-overhead slip 2 will grip.

[0072] The buffering process of buffer component 4:

[0073] The oil supply device 45 is connected to the inlet and return oil circuit of the buffer cylinder 41. First, it enters the inlet and return oil ports of the second control valve 42 (three-position four-way control valve) through the pipeline. After the A / B port of the first control valve 23 passes through the bidirectional hydraulic lock 43, one path enters the rodless chamber of the buffer cylinder 41, and the other path enters the rod chamber of the buffer cylinder 41. A relief valve 44 is connected to the path that enters the rod chamber of the buffer cylinder 41 along the bidirectional hydraulic lock 43. The overflow port of the relief valve 44 is connected to the system return oil circuit. When the drill collar 3 suddenly surges upward due to the impact of the closing pressure, it causes the anti-top slips 2, the traveling beam 5, and the rod pistons of the two buffer cylinders 41 to surge upward simultaneously. At this time, the hydraulic oil in the rod chamber of the buffer cylinder 41 is squeezed, and the pressure rises to the set value. The overflow valve 44 opens, and the rod chamber of the buffer cylinder 41 returns oil through the overflow valve 44, slowly releasing the hydraulic oil. This causes the piston of the buffer cylinder 41 to rise slowly, thereby absorbing the impact on the traveling beam 5 and the anti-top slips 2, achieving a buffering effect, and effectively protecting the well control device.

[0074] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A well control device for drilling plug operations, characterized in that, The well control device includes a mounting frame, a moving beam, a buffer assembly, and anti-top slips; wherein... The mounting frame is used for installation above the wellhead, and the mounting frame is provided with a mounting beam; The anti-overhead slip is mounted on the moving beam. The anti-overhead slip is used to surround the rotating drill collar. The inner side of the anti-overhead slip is provided with locking teeth, and the tooth shape of the locking teeth matches the spiral structure of the drill collar. The buffer assembly is disposed between the mounting beam and the movable beam, and the buffer assembly is used to mitigate the pressure impact caused by the relative movement of the movable beam and the mounting beam.

2. The well control device for drilling plug operations according to claim 1, characterized in that, The locking tooth has a spiral sawtooth structure, and the locking tooth includes at least a connected upper inclined surface and a lower inclined surface. The angle of inclination of the upper inclined surface to the horizontal direction is 50° to 70°, and the angle of inclination of the upper inclined surface to the horizontal direction is 10° to 20°.

3. The well control device for drilling plug operations according to claim 1, characterized in that, The anti-top slip is a pneumatic slip, and the anti-top slip is connected to an air supply device; the air supply device drives the jaws to surround the drill collar through air pressure.

4. The well control device for drilling plug operations according to claim 3, characterized in that, A pneumatic pressure regulating valve and a first control valve are provided between the anti-top clamp and the air supply device. The pneumatic pressure regulating valve is used to regulate the air supply pressure, and the first control valve is used to drive the clamp to engage or disengage by controlling the direction of air inlet and outlet.

5. The well control device for drilling plug operations according to claim 1, characterized in that, The buffer assembly includes at least two buffer cylinders. The fixed end of the buffer cylinder is fixedly connected to the mounting beam, and the output end of the buffer cylinder is fixedly connected to the floating beam. The two buffer cylinders extend and retract synchronously.

6. The well control device for drilling plug operations according to claim 5, characterized in that, The buffer cylinder is connected to an oil supply device, and a second control valve and a two-way hydraulic lock are provided between the oil supply device and the buffer cylinder.

7. The well control device for drilling plug operations according to claim 1, characterized in that, The mounting frame includes multiple support columns, each support column having an adjustable leg for mounting at the wellhead position, and the mounting beam is fixedly disposed between two adjacent adjustable legs.

8. The well control device for drilling plug operations according to claim 7, characterized in that, The adjustable outrigger includes a movable rod and a connecting sleeve, wherein the movable rod is movably inserted into the connecting sleeve and fixed by a limiting member.

9. The well control device for drilling plug operations according to claim 7, characterized in that, The mounting bracket also includes a support column extending upward from the adjustable outrigger, and a fixing clamp is provided on the support column for clamping the cylinder body of the fixed buffer cylinder.

10. The well control device for drilling plug operations according to claim 9, characterized in that, An operating platform is fixedly supported on the support column, and a ladder and an escape slide are respectively provided on the opposite sides of the operating platform.

Images