An electric drive energy storage workover rig

Abstract

The present invention relates to the technical field of workover rigs, and discloses an electric drive energy storage workover rig, which includes a workover mast. Two sliding rods are fixedly connected to the left side of the workover mast. A centering disc capable of lifting up and down is slidably sleeved between the sliding rods. A rotating ring is rotatably connected to the inner wall of the centering disc. A sliding frame is fixedly connected to the rotating ring. A centering frame is slidably clamped in the middle of the sliding frame. A suspension head is ball-jointed to the bottom of the centering frame. The present invention utilizes the centering frame to drive the semi-clamping pipe to correct the deviation from the center position of the wellbore. During the moving and positioning process, a large misalignment between the initial semi-clamping pipe and the wellbore is allowed, greatly reducing the difficulty of the workover mast's seating and positioning. In cooperation with the use of two centering sleeves and cam rods to finely adjust the centering of the semi-clamping pipe and the wellbore, the centering is convenient and highly accurate. In cooperation with the use of a U-shaped guide plate to limit the swinging direction of the suspension head, and the use of two semi-clamping pipes to vertically move and pick up the pipe in a clamping form, thereby improving the accuracy and efficiency of pipe picking.

Description

Technical Field

[0001] The present invention relates to the technical field of workover rigs, and particularly to an electric drive energy storage workover rig. Background Art

[0002] The electric drive energy storage workover rig is an advanced oil workover equipment. It adopts an electric drive system. Compared with the traditional internal combustion engine drive, it has higher energy utilization efficiency, lower noise and exhaust emissions, is more environmentally friendly and energy-saving. At the same time, it is equipped with an energy storage device, which can store excess electric energy during the intermittent period of workover operations and release it when needed, effectively solving the problem of uneven power demand during the operation process, improving the energy utilization rate, and reducing the operating cost.

[0003] At present, when using a workover trailer to seat the workover mast of the electric drive energy storage workover rig, since it is necessary to ensure that the center of the clamping part is aligned with the wellbore, it is necessary to control the trailer to continuously move back and forth to adjust the position. However, it cannot fully ensure that the center of the clamping part is opposite to the wellbore when the workover mast is seated. It can only make the center of the clamping part approximately above the wellbore when the workover mast is seated. This not only makes the operation troublesome but also seriously delays the construction progress. When the alignment is not good, it is easy to cause the pipe string to collide and scrape against the well wall due to eccentricity, and generate additional resistance, increasing the control power consumption; in most existing workover rigs, the clamping part is directly connected to the lower end of the wire rope hook. Since the clamping part adopts a semi-surrounding lateral pipe string clamping mechanism, when reaching the clamping position, the operator needs to rely on experience to control the actuation of the clamping mechanism, and cooperate with the swinging inertia of the hook to make the hook swing to drive the clamping mechanism to swing to one side, and drive the clamping mechanism to use the semi-surrounding bayonet to clamp the pipe string when the hook swings back. Since the swinging force during actual operation is difficult to accurately control due to the construction environment and mechanical influence, and after clamping, the pipe string needs to be lifted out of the wellbore, and it is also necessary to cooperate with the pushing mechanism to push the pipe string to one side and tilt it into the inclined chute for collection, and the corresponding clamping mechanism also tilts to one side. Therefore, when the hook drives the clamping mechanism to return, the swinging force increases, and the swinging direction is difficult to control. Therefore, it is difficult to clamp the pipe string at one time, resulting in a reduction in construction efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide an electric drive energy storage workover rig to solve the problems of poor alignment with the wellbore and difficulty in clamping the pipe string at one time during the use of a general electric drive energy storage workover rig.

[0005] The present invention specifically adopts the following technical solutions to achieve the above purpose:

[0006] An electric drive energy storage workover rig, comprising a workover derrick. Two sliding rods are fixedly connected to the left side of the workover derrick. A centering disc capable of lifting up and down is slidably sleeved between the sliding rods. A rotating ring is rotatably connected to the inner wall of the centering disc. A sliding frame is fixedly connected in the rotating ring. A centering frame is slidably clamped in the middle of the sliding frame. A suspension head is ball-jointed at the bottom of the centering frame. A clamping ring is rotatably connected to the lower wall of the centering frame. A U-shaped guide plate that is movably clamped with the suspension head is fixedly connected to the bottom of the clamping ring. A swing control assembly for locking the suspension head and the U-shaped guide plate is arranged in the centering frame. A fixing assembly for locking the centering frame and the swing control assembly is arranged on the right side of the sliding frame;

[0007] Two semi-clamping pipes capable of opening and closing are arranged at the bottom of the suspension head. A centering sleeve is slidably clamped on the outer wall of the semi-clamping pipe. A semi-circular insertion plate is slidably inserted into the top of the centering sleeve. Cam rods are rotatably connected to the inner walls on both the front and back sides of the centering sleeve.

[0008] Furthermore, it also includes a workover truck. An energy storage mechanism is installed at the bottom of the workover truck. The workover derrick is arranged at the tail of the workover truck. Two pulleys are rotatably connected to the top of the inner cavity of the workover derrick. A driving motor and a power recovery mechanism are installed at the bottom of the inner cavity of the workover derrick. A steel wire rope fixedly connected to the upper wall of the centering disc is arranged at the output end of the driving motor. The steel wire rope passes through the power recovery mechanism and the two pulleys.

[0009] Furthermore, the fixing assembly includes a spiral groove rod rotatably connected to the upper side of the sliding frame. A convex block that is movably clamped with the spiral groove rod is arranged on the top cavity wall of the centering frame. Two friction plates are fixedly sleeved on the right side of the spiral groove rod. A T-shaped pressing plate sleeved on the spiral groove rod is slidably clamped on the right side of the sliding frame. The T-shaped pressing plate is located between the two friction plates. A first telescopic cylinder fixedly connected to the T-shaped pressing plate is installed on the sliding frame. A friction groove corresponding to the T-shaped pressing plate is opened on the upper wall of the inner cavity of the centering disc.

[0010] Furthermore, the swing control assembly includes a chuck slidably clamped on the inner wall of the centering frame. An elastic pin that is clamped with the suspension head is slidably connected to the bottom of the chuck. A first clamping groove adapted to the elastic pin is opened on the top of the suspension head. A chute is penetrated through the chuck. A crank pipe that is movably clamped with the chute is rotatably connected to the top of the inner cavity of the centering frame;

[0011] A guide rod is rotatably connected to the lower side of the sliding frame. The guide rod is slidably clamped in the inner wall of the crank pipe. A first guide groove is opened on the right side of the guide rod. A first pin protrusion that is movably clamped with the first guide groove is arranged on the bottom cavity wall of the T-shaped pressing plate.

[0012] Furthermore, the first guide groove is composed of a connected straight guide groove and arc guide groove.

[0013] Furthermore, friction card slots are formed on the outer wall of the snap ring, and L-shaped abutting plates are fixedly connected to both the left and right sides of the lower wall of the chuck. The L-shaped abutting plates movably pass through the lower wall of the centering frame and can abut against the upper and lower walls of the friction card slots.

[0014] Furthermore, two meshing tooth racks are rotatably connected to the bottom of the suspension head. A telescopic cylinder II is movably hinged between the tooth racks. The half clamping pipe is fixedly connected to the bottom of the tooth rack, and a friction interlayer is fixedly connected to the inner wall of the half clamping pipe.

[0015] Furthermore, a T-shaped elastic column is slidably inserted into the top of the centering sleeve. A card slot II adapted to the T-shaped elastic column is formed on the outer wall of the half clamping pipe. An arc-shaped slot for movably clamping the T-shaped elastic column is formed on the semi-circular insertion plate. The arc-shaped slots on both sides are circumferentially arranged in an array, and a semi-circular slot adapted to the semi-circular insertion plate is formed on the top of the centering sleeve.

[0016] Furthermore, a guide slot II is formed on the cam rod. The guide slot II is composed of a combined spiral guide slot and a vertical guide slot that are connected. A pin convex II that is movably clamped with the vertical guide slot is arranged on the outer wall of the half clamping pipe. A through slot corresponding to the centering sleeve and the cam rod is formed at the bottom of the half clamping pipe.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The present invention uses a rotating ring and a centering frame that can move radially along the rotating ring to drive the half clamping pipe to correct the deviation from the center position of the wellbore. Therefore, during the moving and positioning process, a large misalignment between the initial half clamping pipe and the wellbore is allowed, greatly reducing the seating and positioning difficulty of the workover rig. There is no need for the workover truck to continuously move and correct the position, improving the seating efficiency of the workover rig.

[0019] 2. After the present invention controls the centering disc to drive the half clamping pipe to descend and approach the upper part of the wellbore, it controls the two centering sleeves to synchronously move downward and sleeve around the pipe string to be extracted under the drive of the semi-circular insertion plate. Each cam rod automatically deflects to squeeze the pipe string, thereby controlling the fine centering of the half clamping pipe and the wellbore. The centering is convenient and highly accurate, and the subsequent lifting power consumption is reduced. The U-shaped guide plate is used to limit the swinging direction of the suspension head, thereby avoiding shaking interference in multiple directions. The two half clamping pipes are used to vertically move and pick up the pipe in a clamping form, thereby improving the accuracy and efficiency of picking up the pipe and ensuring the one-time clamping of the pipe string by the subsequent half clamping pipe.

[0020] 3. After the present invention adjusts the centering of the half clamping pipe and the wellbore, and adjusts the U-shaped guide plate to turn to the required direction to limit the swing of the suspension head, the clamping position is locked by the fixing component. The rotating ring and the centering frame are locked at the same time. The synchronous swing control component automatically releases the lock on the suspension head to facilitate its directional swing, and fixes the U-shaped guide plate. The control is convenient and the positioning is safe and reliable. Brief Description of the Drawings

[0021] Figure 1 is a three-dimensional structure diagram of the workover rig of the present invention;

[0022] Figure 2 is a three-dimensional sectional view of the derrick part of the workover rig of the present invention;

[0023] Figure 3 is a three-dimensional structure diagram of the centering plate part of the workover rig of the present invention;

[0024] Figure 4 is a three-dimensional sectional view of the centering plate part of the workover rig of the present invention;

[0025] Figure 5 is a three-dimensional sectional view of the sliding frame part of the workover rig of the present invention;

[0026] Figure 6 is a three-dimensional sectional view of the T-shaped backplate part of the workover rig of the present invention;

[0027] Figure 7 is a three-dimensional sectional view of the centering frame part of the workover rig of the present invention;

[0028] Figure 8 is a three-dimensional sectional view of the semi-pipe clamp part of the workover rig of the present invention;

[0029] Figure 9 is an exploded view of the semi-pipe clamp part of the workover rig of the present invention;

[0030] Figure 10 is a three-dimensional structure diagram of the semi-circular plug and cam rod parts of the workover rig of the present invention.

[0031] Reference Signs: 1, workover truck; 11, energy storage mechanism; 2, derrick; 21, pulley; 22, sliding rod; 23, drive motor; 24, power recovery mechanism; 25, steel wire rope; 3, centering plate; 31, friction groove; 4, swivel ring; 41, sliding frame; 42, spiral groove rod; 43, friction plate; 44, guide rod; 45, first guide groove; 46, T-shaped backplate; 47, first pin projection; 48, first telescopic cylinder; 5, centering frame; 51, convex block; 52, chuck; 53, elastic pin; 54, L-shaped backplate; 55, chute; 56, crank pipe; 6, suspension head; 61, tooth rack; 62, second telescopic cylinder; 63, semi-pipe clamp; 64, friction interlayer; 65, second pin projection; 7, snap ring; 71, U-shaped guide plate; 8, centering sleeve; 81, T-shaped elastic column; 82, semi-circular plug; 83, arc groove; 84, cam rod; 85, second guide groove. Detailed Description of the Invention

[0032] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0033] Embodiment 1, as Figures 1 - 10 shown, an electric drive energy storage workover rig, comprising a workover derrick 2. Two slide bars 22 are fixedly connected to the left side of the workover derrick 2. A centering disc 3 capable of lifting up and down is slidably sleeved between the slide bars 22. A rotating ring 4 is rotatably connected to the inner wall of the centering disc 3. A sliding frame 41 is fixedly connected in the rotating ring 4. A centering frame 5 is slidably clamped in the middle of the sliding frame 41. A suspension head 6 is ball-jointed to the bottom of the centering frame 5. A clamping ring 7 is rotatably connected to the lower wall of the centering frame 5. A U-shaped guide plate 71 which is movably clamped with the suspension head 6 is fixedly connected to the bottom of the clamping ring 7. A swing control assembly for locking the suspension head 6 and the U-shaped guide plate 71 is arranged in the centering frame 5. A fixing assembly for locking the centering frame 5 and the swing control assembly is arranged on the right side of the sliding frame 41;

[0034] Two semi-clamping pipes 63 capable of opening and closing are arranged at the bottom of the suspension head 6. A centering sleeve 8 is slidably clamped on the outer wall of the semi-clamping pipe 63. A semi-circular plug board 82 is slidably inserted into the top of the centering sleeve 8. Cam rods 84 are rotatably connected to the inner walls of the front and rear sides of the centering sleeve 8.

[0035] During use, the centering frame 5 is at the center of the rotating ring 4. The workover derrick 2 is erected near the wellbore so that the centering frame 5 is relatively above the wellbore, and it is ensured that the wellbore is correspondingly below the inner range of the rotating ring 4. Control the centering disc 3 to drive the semi-clamping pipes 63 to descend above the wellbore and close to the pipe string to be extracted. Control the fixing assembly to release the fixing restriction on the centering frame 5. Slide the centering frame 5 along the sliding frame 41, and cooperate with controlling the centering frame 5 to drive the rotating ring 4 to rotate, so that the semi-clamping pipes 63 approach and finally are relatively directly above the pipe string to be extracted. Subsequently, control the two centering sleeves 8 to descend. The two semi-circular plug boards 82 are synchronously inserted into the centering sleeves 8 on the opposite sides, so that the two centering sleeves 8 can synchronously descend relative to the semi-clamping pipes 63. The centering sleeves 8 are sleeved on the periphery of the pipe string to be extracted and continue to descend. Each cam rod 84 automatically deflects to extrude the pipe string. Under the extrusion force, the centering frame 5 automatically moves, so as to facilitate controlling the fine centering of the semi-clamping pipes 63 and the pipe string. The centering is convenient and has high accuracy, and the lifting power consumption is reduced, ensuring that the subsequent semi-clamping pipes 63 can clamp the pipe string at one time. After the centering is completed, control the U-shaped guide plate 71 to turn to the required pipe releasing direction. Control the fixing assembly to lock the centering frame 5 and the swing control assembly. The position of the centering frame 5 in the rotating ring 4 is fixed. The swing control assembly locks the U-shaped guide plate 71 and unlocks the suspension head 6. The suspension head 6 can swing along the opening fixed direction of the U-shaped guide plate 71, so as to facilitate directional pipe releasing and reduce the interference of ineffective swinging. When resetting after pipe releasing, it is blocked by the U-shaped guide plate 71, so as to facilitate quickly controlling the suspension head 6 to stop, so as to cooperate with the semi-clamping pipes 63 to clamp the pipe string for the second time. When clamping the pipe string, the slide bars 22 are used to vertically guide the centering disc 3, and the two semi-clamping pipes 63 adopt the form of opening and closing on both sides to cooperate with pipe taking, reducing the shaking effect on the suspension head 6, thereby improving the accuracy and efficiency of pipe taking.

[0036] Embodiment 2. On the basis of the above embodiment, it further includes a workover rig 1. An energy storage mechanism 11 is installed at the bottom of the workover rig 1. The workover derrick 2 is arranged at the tail of the workover rig 1. Two pulleys 21 are rotatably connected to the top of the inner cavity of the workover derrick 2. A driving motor 23 and a power recovery mechanism 24 are installed at the bottom of the inner cavity of the workover derrick 2. A wire rope 25 fixedly connected to the upper wall of the centering disc 3 is arranged at the output end of the driving motor 23. The wire rope 25 passes through the power recovery mechanism 24 and the two pulleys 21.

[0037] During the pipe-taking operation by moving the centering disc 3 upward, the driving motor 23 drives the wire rope 25 at the output end to wind up, and the power recovery mechanism 24 does not work. When controlling the centering disc 3 to move downward for the pipe-laying operation, the power recovery mechanism 24 operates to intervene and store the recovered electric energy into the energy storage mechanism 11 for utilization, thereby optimizing the use of the power supply.

[0038] Embodiment 3. On the basis of the above embodiment, the fixing assembly includes a spiral groove rod 42 rotatably connected to the upper side of the sliding frame 41. A convex block 51 that is movably clamped with the spiral groove rod 42 is arranged on the top cavity wall of the centering frame 5. Two friction plates 43 are fixedly sleeved on the right side of the spiral groove rod 42. A T-shaped abutting plate 46 sleeved on the spiral groove rod 42 is slidably clamped on the right side of the sliding frame 41. The T-shaped abutting plate 46 is located between the two friction plates 43. A first telescopic cylinder 48 fixedly connected to the T-shaped abutting plate 46 is installed on the sliding frame 41. A friction groove 31 corresponding to the T-shaped abutting plate 46 is opened on the upper wall of the inner cavity of the centering disc 3.

[0039] Initially, the first telescopic cylinder 48 drives the T-shaped abutting plate 46 to abut against one side wall of the friction groove 31 and the left friction plate 43 respectively, thereby restricting the rotation of the sliding frame 41 and the spiral groove rod 42. Since the centering frame 5 is movably clamped with the spiral groove rod 42 through the convex block 51 and the centering frame 5 is slidably clamped in the sliding frame 41, the centering frame 5 is restricted from moving, so as to facilitate the fixation of the centering frame 5 during transportation and avoid arbitrary sliding and collision.

[0040] Embodiment 4. On the basis of the above embodiment, the swing control assembly includes a chuck 52 slidably clamped on the inner wall of the centering frame 5. A resilient pin 53 clamped with the suspension head 6 is slidably connected to the bottom of the chuck 52. A first clamping groove adapted to the resilient pin 53 is opened on the top of the suspension head 6. A chute 55 penetrates through the chuck 52. A crank pipe 56 rotatably connected to the top of the inner cavity of the centering frame 5 and movably clamped with the chute 55 is provided;

[0041] A guide rod 44 is rotatably connected to the lower side of the sliding frame 41. The guide rod 44 is slidably clamped with the inner wall of the crank pipe 56. A first guide groove 45 is opened on the right side of the guide rod 44. A first pin protrusion 47 movably clamped with the first guide groove 45 is arranged on the bottom cavity wall of the T-shaped abutting plate 46.

[0042] The initial elastic pin 53 is snapped into the first slot, the chuck 52 is restricted from moving based on the sliding groove 55 by the crank pipe 56, and the guide rod 44 is restricted from rotating based on the first pin projection 47 by the T-shaped abutting plate 46. Since the outer wall of the crank pipe 56 is slidably clamped with the outer wall of the guide rod 44, the crank pipe 56 is restricted from rotating, and the elastic pin 53 stably clamps the first slot, and the hanging head 6 is restricted from swinging, thereby avoiding the random swinging and collision of the hanging head 6 due to transportation before use.

[0043] Further, the first guide groove 45 is composed of a combined structure of a straight guide groove and an arc guide groove that are connected.

[0044] When centering, control the first telescopic cylinder 48 to extend, driving the T-shaped abutting plate 46 to be in the middle position between the two friction plates 43. Correspondingly, the fixing of the sliding frame 41 and the centering frame 5 is released, so that the centering frame 5 can be adjusted to different positions. The initial first pin projection 47 is slidably clamped with the straight guide groove. After the T-shaped abutting plate 46 moves, the first pin projection 47 is clamped into the arc guide groove for a small distance along the straight guide groove, and the guide rod 44 rotates slightly, but the elastic pin 53 still does not come out of the first slot, and the elastic pin 53 still stably clamps the first slot to restrict the swinging of the hanging head 6, thereby ensuring that the semi-clamping pipe 63 part is always vertically downward during centering, facilitating finding the centering position;

[0045] After centering is completed, control the first telescopic cylinder 48 to continue to extend, driving the T-shaped abutting plate 46 to abut against the right friction plate 43 and also abut against the other side of the friction groove 31. The sliding frame 41 and the spiral groove rod 42 are restricted from rotating again, and the centering frame 5 is thus fixed again at any position. Since the first pin projection 47 continuously moves along the arc guide groove, the guide rod 44 is driven to deflect greatly, and the elastic pin 53 thus comes out of the first slot, facilitating the swinging and pipe releasing of the hanging head 6 after centering.

[0046] Embodiment 5, on the basis of the above embodiment, the outer wall of the clamping ring 7 is provided with a friction slot. Both the left and right sides of the lower wall of the chuck 52 are fixedly connected with L-shaped abutting plates 54. The L-shaped abutting plates 54 movably pass through the lower wall of the centering frame 5 and can abut against the upper and lower walls of the friction slot.

[0047] Initially, the L-shaped abutting plate 54 abuts against the lower wall of the friction slot driven by the chuck 52, and the clamping ring 7 is restricted from rotating, thereby avoiding the random rotation and collision of the U-shaped guide plate 71 during transportation and the excessive rotation and wear of the clamping ring 7. When centering, as the guide rod 44 rotates slightly, the crank pipe 56 drives the chuck 52 to make the L-shaped abutting plate 54 move slightly upward, and the abutting limit of the L-shaped abutting plate 54 against the lower wall of the friction slot is released, so as to facilitate synchronously adjusting the opening direction of the U-shaped guide plate 71 according to the required pipe releasing direction to control the swinging direction of the subsequent hanging head 6;

[0048] After centering is completed, since the pin protrusion 47 of the first pin continues to move along the arc guide groove, the guide rod 44 is driven to deflect significantly, and the L-shaped abutting plate 54 moves upward significantly just to abut against the upper wall of the friction card slot. Thus, after the centering frame 5 is fixed, the U-shaped guide plate 71 is fixed synchronously to stably limit the swinging direction of the subsequent suspension head 6, avoiding the swinging interference of the suspension head 6 in different directions caused by various factors and affecting the effect of the semi-clamping tube 63 clamping the pipe string.

[0049] Embodiment Six: On the basis of the above embodiment, two meshing tooth racks 61 are rotatably connected to the bottom of the suspension head 6. An expansion cylinder 62 is movably hinged between the tooth racks 61. The semi-clamping tube 63 is fixedly connected to the bottom of the tooth rack 61, and a friction interlayer 64 is fixedly connected to the inner wall of the semi-clamping tube 63.

[0050] Through the meshing mechanism between the tooth racks 61, the symmetrical opening and closing of the two semi-clamping tubes 63 are ensured, reducing the shaking effect when the expansion cylinder 62 drives the semi-clamping tubes 63 to open and close. At the same time, the pipe string is clamped by the opening and closing method, cooperating with the vertical movement of the centering disc 3, and cooperating with the friction interlayer 64 to increase the friction force. Clamping the pipe string is more stable than other methods and can achieve the one-time clamping of the pipe string, thus improving the accuracy and efficiency of pipe extraction.

[0051] Embodiment Seven: On the basis of the above embodiment, a T-shaped elastic column 81 is slidably inserted into the top of the centering sleeve 8. A second card slot adapted to the T-shaped elastic column 81 is opened on the outer wall of the semi-clamping tube 63. An arc-shaped groove 83 for movably clamping the T-shaped elastic column 81 is opened on the semi-circular insertion plate 82. The arc-shaped grooves 83 on both sides are circumferentially arranged in an array, and a semi-circular groove adapted to the semi-circular insertion plate 82 is opened at the top of the centering sleeve 8.

[0052] A second guide groove 85 is opened on the cam rod 84. The second guide groove 85 is composed of a combined spiral guide groove and a vertical guide groove. A second pin protrusion 65 adapted to the vertical guide groove is arranged on the outer wall of the semi-clamping tube 63. A through groove corresponding to the centering sleeve 8 and the cam rod 84 is opened at the bottom of the semi-clamping tube 63.

[0053] Initially, the T-shaped elastic column 81 is engaged with the second card slot, and the centering sleeve 8 is stably fixed on the outer wall of the semi-clamped tube 63. When the centering frame 5 is adjusted to be relatively above the wellbore during centering, the T-shaped elastic columns 81 on both sides are pulled out of the second card slot. The T-shaped elastic column 81 simultaneously toggles the arc groove 83, driving the semicircular plug plate 82 to deflect, so as to be plugged into the semicircular groove on the centering sleeve 8 on the opposite side, and controlling the centering sleeves 8 on both sides to move downward synchronously relative to the semi-clamped tube 63, so that the centering sleeves 8 are sleeved on the periphery of the pipe column to be extracted and continue to move downward. The initial pin convex second 65 is engaged with the vertical In the guide groove, after the centering sleeve 8 has not descended a sufficient distance, the cam rod 84 does not deflect. After the centering sleeve 8 descends and is completely sleeved on the periphery of the pipe column to be extracted, the pin protrusion 65 is clamped into the spiral guide groove by the vertical guide groove, thereby driving the cam rod 84 to deflect, and cooperating with the synchronous deflection of the cam rod 84 in four directions to squeeze the pipe column, so as to facilitate automatic control of the semi-clamp 63 and the pipe column for fine-tuning the centering when the centering frame 5 is not fixed. The centering is convenient and accurate, which ensures that the subsequent semi-clamp 63 can clamp the pipe column once and for all, and reduces the lifting power consumption.

[0054] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electric drive energy storage workover rig, comprising a workover derrick (2), characterized in that, On the left side of the workover derrick (2), two slide bars (22) are fixedly connected. A centering disc (3) capable of lifting up and down is slidably sleeved between the slide bars (22). A rotating ring (4) is rotatably connected to the inner wall of the centering disc (3). A sliding frame (41) is fixedly connected in the rotating ring (4). A centering frame (5) is slidably clamped in the middle of the sliding frame (41). A suspension head (6) is spherical-hinged at the bottom of the centering frame (5). A clamping ring (7) is rotatably connected to the lower wall of the centering frame (5). A U-shaped guide plate (71) that is movably clamped with the suspension head (6) is fixedly connected to the bottom of the clamping ring (7). A swing control assembly for locking the suspension head (6) and the U-shaped guide plate (71) is arranged in the centering frame (5). A fixing assembly for locking the centering frame (5) and the swing control assembly is arranged on the right side of the sliding frame (41). The fixing assembly includes a spiral groove rod (42) rotatably connected to the upper side of the sliding frame (41). A convex block (51) that is movably clamped with the spiral groove rod (42) is arranged on the top cavity wall of the centering frame (5). Two friction plates (43) are fixedly sleeved on the right side of the spiral groove rod (42). A T-shaped pressing plate (46) sleeved on the spiral groove rod (42) is slidably clamped on the right side of the sliding frame (41). The T-shaped pressing plate (46) is located between the two friction plates (43). A first telescopic cylinder (48) fixedly connected to the T-shaped pressing plate (46) is installed on the sliding frame (41). A friction groove corresponding to the T-shaped pressing plate (46) is opened on the upper wall of the inner cavity of the centering disc (3). The swing control assembly includes a chuck (52) slidably clamped on the inner wall of the centering frame (5). A resilient pin (53) that is clamped with the suspension head (6) is slidably connected to the bottom of the chuck (52). A first clamping groove adapted to the resilient pin (53) is opened on the top of the suspension head (6). A chute (55) is penetrated through the chuck (52). A crank pipe (56) that is movably clamped with the chute (55) is rotatably connected to the top of the inner cavity of the centering frame (5). A guide rod (44) is rotatably connected to the lower side of the sliding frame (41). The guide rod (44) is slidably clamped with the inner wall of the crank pipe (56). A first guide groove (45) is opened on the right side of the guide rod (44). A first pin projection (47) that is movably clamped with the first guide groove (45) is arranged on the bottom cavity wall of the T-shaped pressing plate (46). The first guide groove (45) is composed of a connected straight guide groove and an arc guide groove. Friction clamping grooves are opened on the outer wall of the clamping ring (7). L-shaped pressing plates (54) are fixedly connected to the left and right sides of the lower wall of the chuck (52). The L-shaped pressing plates (54) movably pass through the lower wall of the centering frame (5) and can abut against the upper and lower walls of the friction clamping grooves. Two half clamping pipes (63) capable of opening and closing are arranged at the bottom of the suspension head (6). A centering sleeve (8) is slidably clamped on the outer wall of the half clamping pipes (63). A semi-circular plug board (82) is slidably inserted into the top of the centering sleeve (8). Cam rods (84) are rotatably connected to the inner walls of the front and rear sides of the centering sleeve (8).

2. The electric drive energy storage workover rig according to claim 1, characterized in that, It further includes a workover rig (1). An energy storage mechanism (11) is installed at the bottom of the workover rig (1). The workover mast (2) is arranged at the tail of the workover rig (1). Two pulleys (21) are rotatably connected to the top of the inner cavity of the workover mast (2). A driving motor (23) and a power recovery mechanism (24) are installed at the bottom of the inner cavity of the workover mast (2). A steel wire rope (25) fixedly connected to the upper wall of the centering disc (3) is arranged at the output end of the driving motor (23). The steel wire rope (25) passes through the power recovery mechanism (24) and the two pulleys (21).

3. The electric drive energy storage workover rig according to claim 2, characterized in that, Two mutually meshing tooth racks (61) are rotatably connected to the bottom of the suspension head (6). A telescopic cylinder II (62) is movably hinged between the tooth racks (61). The half clamp pipe (63) is fixedly connected to the bottom of the tooth racks (61). A friction interlayer (64) is fixedly connected to the inner wall of the half clamp pipe (63).

4. The electric drive energy storage workover rig according to claim 3, characterized in that A T-shaped elastic column (81) is slidably inserted into the top of the centering sleeve (8). A second card slot adapted to the T-shaped elastic column (81) is formed in the outer wall of the half clamp pipe (63). An arc-shaped groove (83) for movably clamping the T-shaped elastic column (81) is formed in the semi-circular plug board (82). The two arc-shaped grooves (83) are arranged in a circumferential array. A semi-circular groove adapted to the semi-circular plug board (82) is formed in the top of the centering sleeve (8).

5. The electric drive energy storage workover rig according to claim 4, wherein, A second guide groove (85) is formed in the cam rod (84). The second guide groove (85) is composed of a combined spiral guide groove and a vertical guide groove. A second pin protrusion (65) movably clamped with the vertical guide groove is arranged on the outer wall of the half clamp pipe (63). A through groove corresponding to the centering sleeve (8) and the cam rod (84) is formed in the bottom of the half clamp pipe (63).

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