Variable downhole hydraulic hoist

Abstract

The present application relates to the technical fields of downhole hydraulic lifting, and particularly relates to a variable downhole hydraulic lifting device. The present application provides a variable downhole hydraulic lifting device which can make downhole instruments more stable in lifting transportation and increase lifting safety and stability. The variable downhole hydraulic lifting device comprises a walking base, a hydraulic pump, a hydraulic support and a crossbeam, etc. The walking base has two and is symmetrically arranged left and right. The hydraulic pump is connected to the side of the walking base which is away from each other. The hydraulic support is connected to the upper side of the front and rear parts of the walking base. The crossbeam is connected between the top of the hydraulic support. The first hydraulic cylinder lifts the first rotating plate upward to drive the supporting plate to move upward and contact the bottom of the downhole instrument to stably support the bottom of the downhole instrument. The downhole instrument can be more stable in lifting transportation, and the lifting safety and stability are increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of downhole hydraulic lifting, in particular to a variable downhole hydraulic lifting device. BACKGROUND

[0002] The downhole hydraulic lifting device is a device used in the process of oil and gas well construction and maintenance, which is mainly used for lifting and operating downhole tools, equipment and pipe columns.

[0003] The existing downhole hydraulic lifting device is usually composed of a lifting beam and a chain hook, the chain hook is connected with the downhole instrument, and then the lifting beam is used to lift the chain hook upward to lift the downhole instrument, and then the lifting beam is moved to transport the downhole instrument. However, the chain hook is used to lift the downhole instrument, the bottom of the downhole instrument is suspended, the chain hook is subjected to force, the stability is poor when moving, the tension of the chain hook is not easy to control, and the downhole instrument is easy to shake and hit the lifting beam foot, causing the structure of the lifting beam to be damaged and accidents to occur.

[0004] Therefore, the present application provides a variable downhole hydraulic lifting device which can make the downhole instrument more stable during lifting and transportation, and increase the safety and stability of lifting. SUMMARY

[0005] In order to overcome the shortcomings of the existing downhole hydraulic lifting device that the bottom of the downhole instrument is suspended, the chain hook is subjected to force, the stability is poor when moving, the downhole instrument is easy to shake and hit the lifting beam foot, the structure of the lifting beam is damaged, and accidents occur, the present application provides a variable downhole hydraulic lifting device which can make the downhole instrument more stable during lifting and transportation, and increase the safety and stability of lifting.

[0006] The technical embodiment of the present application is: a variable downhole hydraulic lifting device, comprising a walking base, a hydraulic pump, a hydraulic foot, a cross beam, a lifting frame, a hydraulic rod, a lifting chain, a hook, a supporting mechanism and a supporting mechanism, the walking base has two and is symmetrically arranged, the hydraulic pump is connected to the walking base on the side away from each other, the hydraulic foot is connected to the walking base on the upper side, the cross beam is connected between the top of the hydraulic foot, the hydraulic rod is connected to the cross beam on the left and right sides, the lifting frame is connected between the extension ends of the hydraulic rod, the lifting frame is connected to the cross beam in a sliding manner, the lifting chain is connected to the lifting frame on the left and right sides in a rotating manner, the hook is connected to the bottom of the lifting chain in a rotating manner, the supporting mechanism is arranged on the walking base to support the bottom of the downhole instrument, and the supporting mechanism is arranged on the supporting mechanism.

[0007] Further, the sliding groove is arranged on the lower part of the walking base, which can be connected with the downhole moving track, and can move along the downhole moving track.

[0008] Further, the supporting mechanism comprises a mounting seat, a first hydraulic cylinder, a first rotating plate and a supporting plate, the mounting seat is connected to the side of the walking base where the two parts are close to each other, the first hydraulic cylinder is connected to the mounting seat, the first rotating plate is rotatably connected to the first hydraulic cylinder, the supporting plate is connected to the first rotating plate, the first rotating plate is rotated to drive the supporting plate to rotate, the lower part of the supporting plate is moved to the bottom of the downhole instrument, and the first hydraulic cylinder is used to lift the first rotating plate to drive the supporting plate to move upward and contact the bottom of the downhole instrument, so that the bottom of the downhole instrument is supported and stabilized, and the safety and stability of lifting are improved.

[0009] Further, the supporting mechanism comprises a sliding rail, a first supporting plate and a clamping block, the sliding rail is connected to the side of the walking base where the two parts are close to each other, the first supporting plate is slidably connected to the sliding rail, and the clamping block is connected to the lower part of the supporting plate. The clamping block can be clamped with the adjacent first supporting plate, the supporting plate is rotated to drive the clamping block to rotate, the clamping block is clamped with the adjacent first supporting plate, the first supporting plate is clamped with the clamping block to support and strengthen the lower part of the supporting plate, and the deformation of the lower part of the supporting plate is avoided to affect the supporting stability.

[0010] Further, the supporting mechanism comprises a supporting seat, a second hydraulic cylinder, a push rod and a stabilizing push plate, the supporting seat is connected to the top of the walking base, the second hydraulic cylinder is connected to the upper part of the supporting seat, the push rod is connected to the second hydraulic cylinder, and the stabilizing push plate is connected to the side of the push rod where the two parts are close to each other. The second hydraulic cylinder controls the stabilizing push plate to move close to each other through the push rod, and the left and right sides of the lifting downhole instrument are pressed and stabilized.

[0011] Further, the supporting mechanism comprises a supporting seat, a second hydraulic cylinder, a push rod and a stabilizing push plate, the supporting seat is connected to the top of the walking base, the second hydraulic cylinder is connected to the upper part of the supporting seat, the push rod is connected to the second hydraulic cylinder, and the stabilizing push plate is connected to the side of the push rod where the two parts are close to each other. The second hydraulic cylinder controls the stabilizing push plate to move close to each other through the push rod, and the left and right sides of the lifting downhole instrument are pressed and stabilized.

[0012] Further, the anti-dropping mechanism for limiting and stabilizing the hook is further included, the anti-dumping mechanism comprises a guide plate, a lifting plate, an anti-dumping plate and a fastening screw, the guide plates are connected to the upper sides of the left and right two parts of the walking base, the lifting plates are slidably connected to the guide plates, the anti-dumping plates are slidably connected to the upper parts of the lifting plates, the fastening screws are threadedly connected to the top parts of the lifting plates, the fastening screws are in extrusion fit with the adjacent anti-dumping plates, the lifting plates move up and down on the guide plates to drive the anti-dumping plates to move, the anti-dumping plates move left and right on the lifting plates to fit the positions of the hooks with the lifting plates, the hooks are limited and stabilized, meanwhile, the fastening screws limit and fix the anti-dumping plates, so that the stability and safety are improved.

[0013] Further, the limiting mechanism for stabilizing the lower part of the hoisted underground instrument is further included, the limiting mechanism comprises a second support plate, a second rotating plate, a lead screw, a rotating wheel and a limiting disc, the second support plates are connected to the front and rear sides of the walking base, the second rotating plates are rotatably connected to the second support plates, the lead screws are threadedly connected to the second rotating plates, the rotating wheels are connected to the sides away from each other of the lead screws, and the limiting discs are rotatably connected to the sides close to each other of the lead screws, the rotating wheels are rotated to drive the lead screws to rotate, the lead screws rotate to move forward and backward on the second rotating plates, and when the lead screws are close to each other, the limiting discs contact the lower part of the hoisted underground instrument to stabilize the lower part of the hoisted underground instrument.

[0014] Compared with the prior art, the present application has the following advantages: 1. The first hydraulic cylinder is used to lift the first rotating plate upward to drive the supporting plate to move upward and contact the bottom of the underground instrument, so that the bottom of the underground instrument is supported and stabilized, the underground instrument is more stable during hoisting and transportation, and the hoisting safety and stability are improved.

[0015] 2. The second hydraulic cylinder is used to control the stable push plate to move close to each other and contact the hoisted underground instrument, so that the hoisting stability and safety of the underground instrument are improved.

[0016] 3. When the push rod is started, the unfolded push frame is driven to move, the unfolded push frame drives the unfolded rotating rod to move, and the unfolded rotating rod automatically drives the first rotating plate to rotate, so that the first rotating plate is automatically unfolded and controlled to rotate, the safety of the first rotating plate during use is improved, the manpower is saved, the efficiency is improved, and the linkage utilization rate in mechanical operation is improved.

[0017] 4. The anti-dumping plate is used to move left and right on the lifting plate to fit the positions of the hooks with the lifting plate, so that the hooks are limited and stabilized, the hooks are prevented from slipping off, and the stability of the hooks is improved.

[0018] 5. The present invention stabilizes the lower part of the hoisted downhole equipment by using a limiting plate to contact the lower part of the hoisted equipment when the aforementioned lead screws approach each other, thereby improving the safety and stability of the hoisting process. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0020] Figure 2 This is a schematic diagram of a portion of the three-dimensional structure of the present invention.

[0021] Figure 3 This is a three-dimensional structural diagram of the support mechanism of the present invention.

[0022] Figure 4 This is a three-dimensional structural diagram of the support mechanism of the present invention.

[0023] Figure 5 This is a three-dimensional structural diagram of the stabilizing mechanism of the present invention.

[0024] Figure 6 This is a first-view three-dimensional structural diagram of the unfolding mechanism of the present invention.

[0025] Figure 7 This is a two-dimensional structural diagram of the unfolding mechanism of the present invention from a second perspective.

[0026] Figure 8 This is a three-dimensional structural diagram of the anti-detachment mechanism of the present invention.

[0027] Figure 9 This is a three-dimensional structural diagram of the limiting mechanism of the present invention.

[0028] Reference numerals: 1. Traveling base; 2. Hydraulic pump; 3. Hydraulic outriggers; 4. Crossbeam; 5. Lifting frame; 6. Hydraulic rod; 7. Lifting chain; 8. Hook; 9. Loading mechanism; 91. Mounting base; 92. First hydraulic cylinder; 93. First rotating plate; 94. Loading plate; 10. Support mechanism; 101. Slide rail; 102. First support plate; 103. Locking block; 11. Stabilizing mechanism; 111. Support base; 112. Second hydraulic cylinder; 11 3. Push rod; 114. Stabilizing push plate; 12. Unfolding mechanism; 121. Unfolding push frame; 122. Guide rod; 123. Sliding plate; 124. Unfolding rotating rod; 125. Torsion spring; 13. Anti-detachment mechanism; 131. Guide plate; 132. Lifting plate; 133. Anti-detachment plate; 134. Fastening screw; 14. Limiting mechanism; 141. Second support plate; 142. Second rotating plate; 143. Lead screw; 144. Rotating wheel; 145. Limiting plate. Detailed Implementation

[0029] The preferred technical solution of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] A variable downhole hydraulic lifting device, as shown in Figure 1 and Figure 2 , comprising a walking base 1, a hydraulic pump 2, a hydraulic foot 3, a crossbeam 4, a lifting frame 5, a hydraulic rod 6, a lifting chain 7, a hook 8, a supporting mechanism 9 and a supporting mechanism 10, the walking base 1 is symmetrical left and right, and each has a sliding groove at the lower part, which can be connected with the downhole moving track, and can move along the downhole moving track, the hydraulic pump 2 is connected to the side of the walking base 1 away from each other, the hydraulic foot 3 is connected to the upper side of the walking base 1, the crossbeam 4 is connected between the top of the hydraulic foot 3, the hydraulic rod 6 is connected to the left and right sides of the crossbeam 4, the lifting frame 5 is connected between the extension ends of the hydraulic rod 6, the lifting frame 5 is slidingly connected with the crossbeam 4, the lifting chain 7 is rotatably connected to the lower side of the lifting frame 5, the hook 8 is rotatably connected to the bottom of the lifting chain 7, the supporting mechanism 9 is arranged on the walking base 1, and the supporting mechanism 10 is arranged on the supporting mechanism 9.

[0031] As shown in Figure 1 and Figure 3 , the supporting mechanism 9 comprises a mounting seat 91, a first hydraulic cylinder 92, a first rotating plate 93 and a supporting plate 94, the mounting seat 91 is connected to the side of the walking base 1 close to each other, the first hydraulic cylinder 92 is connected to the mounting seat 91, the first rotating plate 93 is rotatably connected to the extension end of the first hydraulic cylinder 92, and the supporting plate 94 is connected to the first rotating plate 93.

[0032] As shown in Figure 1 and Figure 4 , the supporting mechanism 10 comprises a sliding rail 101, a first supporting plate 102 and a clamping block 103, the sliding rail 101 is connected to the side of the walking base 1 close to each other, the first supporting plate 102 is slidingly connected to the sliding rail 101, the clamping block 103 is connected to the lower part of the supporting plate 94, and the clamping block 103 can be clamped with the adjacent first supporting plate 102.

[0033] The application is used, first, the walking base 1 is used to travel to the hoisting position of the downhole equipment, then the hook 8 is used to hook the downhole equipment to be hoisted, after fixing, the hydraulic pump 2 is used to inject hydraulic oil into the hydraulic foot 3, so that the hydraulic foot 3 jacks up the cross beam 4, the cross beam 4 drives the lifting frame 5 to move upward, the lifting frame 5 uses the hook 8 to hoist the downhole equipment, and then the walking base 1 is used to move to hoist and transport the downhole equipment; the extension and retraction of the hydraulic cylinder during hoisting can control the lifting frame 5 to slide on the cross beam 4, change the hoisting position and the hoisting position of the downhole equipment, when the lifting chain 7 hoists the downhole mechanical equipment, the first rotating plate is rotated to drive the supporting plate 94 to rotate, the supporting plate 94 is rotated to move to the bottom of the downhole equipment, and then the first hydraulic cylinder 92 jacks up the first rotating plate 93 to drive the supporting plate 94 to move upward and contact the bottom of the downhole equipment, so that the bottom of the downhole equipment is supported and stabilized, the hoisting safety and stability are improved, the supporting plate 94 is rotated to drive the clamping block 103 to rotate, the clamping block 103 is rotated to be clamped with the adjacent first supporting plate 102, the first supporting plate 102 is clamped with the clamping block 103 to support and strengthen the lower part of the supporting plate 94, so that the deformation of the lower part of the supporting plate 94 does not affect the supporting stability, the downhole equipment is more stable during hoisting and transportation, and the hoisting safety and stability are improved.

[0034] As shown in Figure 1 and Figure 5 , the stabilizing mechanism 11 is further included, the stabilizing mechanism 11 includes the supporting seat 111, the second hydraulic cylinder 112, the push rod 113 and the stabilizing push plate 114, the walking base 1 is connected with the supporting seat 111 on the top, the second hydraulic cylinder 112 is connected with the supporting seat 111 on the upper part, the push rod 113 is connected with the second hydraulic cylinder 112 on the extension end, and the stabilizing push plate 114 is connected with the push rod 113 on the side close to each other.

[0035] The stabilizing mechanism 11 of the application can press and stabilize the left and right sides of the hoisted downhole equipment, the extension end of the second hydraulic cylinder 112 controls the stabilizing push plate 114 to be close to each other through the push rod 113, and the left and right sides of the hoisted downhole equipment are pressed and stabilized, and the extension end of the second hydraulic cylinder 112 controls the stabilizing push plate 114 to be close to each other through the push rod 113 to contact the hoisted downhole equipment, which can increase the hoisting stability and safety of the downhole equipment.

[0036] As shown in Figure 1 , Figure 6 and Figure 7As shown, it also includes the unfolding mechanism 12, which includes the unfolding pusher 121, the guide rod 122, the sliding plate 123, the unfolding rotating rod 124 and the torsion spring 125, the push rod 113 is connected with the unfolding pusher 121, the left and right sides of the walking base 1 are connected with the guide rod 122, the guide rod 122 is slidably connected with the sliding plate 123, the top of the first rotating plate 93 is connected with the unfolding rotating rod 124, the unfolding rotating rod 124 is in extrusion fit with the adjacent unfolding pusher 121, the upper part of the sliding plate 123 is connected with the adjacent first rotating plate 93 through the torsion spring 125, and the first rotating plate 93 moves upward to drive the sliding plate 123 to move up and down through the torsion spring 125.

[0037] The unfolding mechanism 12 of the present application can automatically drive the first rotating plate 93 to rotate, the push rod 113 drives the unfolding pusher 121 to move when it is activated, the unfolding pusher 121 drives the unfolding rotating rod 124, the unfolding rotating rod 124 automatically drives the first rotating plate 93 to rotate, the rotation of the first rotating plate 93 causes the torsion spring 125 to deform, and the torsion spring 125 automatically controls the first rotating plate 93 to rotate back to the original position when the unfolding rotating rod 124 is separated from the unfolding pusher 121. Through the above operation, the push rod 113 drives the unfolding pusher 121 to move when it is activated, the unfolding pusher 121 drives the unfolding rotating rod 124, and the unfolding rotating rod 124 automatically drives the first rotating plate 93 to rotate, the first rotating plate 93 can be automatically unfolded and controlled to rotate, the safety of the first rotating plate 93 during use is improved, manpower is saved, efficiency is improved, and the linkage utilization rate in mechanical operation is improved.

[0038] As shown in Figure 1 and Figure 8 The present application also includes the anti-dropping mechanism 13, which includes the guide plate 131, the lifting plate 132, the anti-dropping plate 133 and the fastening screw 134, the left and right sides of the walking base 1 are connected with the guide plate 131, the guide plate 131 is slidably connected with the lifting plate 132, the lifting plate 132 is slidably connected with the anti-dropping plate 133, and the top of the lifting plate 132 is threadedly connected with the fastening screw 134, which is in extrusion fit with the adjacent anti-dropping plate 133.

[0039] The anti-dropping mechanism 13 of the present application can limit and stabilize the hook 8, the lifting plate 132 moves up and down on the guide plate 131 to drive the anti-dropping plate 133 to move, the anti-dropping plate 133 moves left and right on the lifting plate 132 to adapt to the position of the hook 8, limits and stabilizes the hook 8, and at the same time, the fastening screw 134 limits and fixes the anti-dropping plate 133 to improve stability and safety. Through the above operation, the anti-dropping plate 133 moves left and right on the lifting plate 132 to adapt to the position of the hook 8, limits and stabilizes the hook 8, and prevents the hook 8 from slipping off to improve the stability of the hook 8.

[0040] As Figure 1 and Figure 9 Also include the limiting mechanism 14, the limiting mechanism 14 includes the second support plate 141, the second rotating plate 142, the lead screw 143, the rotating wheel 144 and the limiting disc 145, the walking base 1 front and back sides are connected with the second support plate 141, the second support plate 141 are all connected with the second rotating plate 142 in rotation mode, the second rotating plate 142 are all connected with the lead screw 143 in screw mode, the lead screw 143 are all connected with the rotating wheel 144 on the side away from each other, the lead screw 143 are all connected with the limiting disc 145 in rotation mode on the side close to each other.

[0041] Use the limiting mechanism 14 of the application, the lower part of the downhole hoisted instrument can be stabilized, the rotating wheel 144 drives the lead screw 143 to rotate, the lead screw 143 rotates to move forward and backward on the second rotating plate 142, when the lead screw 143 are close to each other, the downhole hoisted instrument lower part is contacted through the limiting disc 145, the downhole hoisted instrument lower part is stabilized, through the operation that the downhole hoisted instrument lower part is contacted through the limiting disc 145 when the lead screw 143 are close to each other, the downhole hoisted instrument lower part can be stabilized, the hoisting safety and stability are improved.

[0042] It should be understood that the above description is only for exemplary purposes and does not mean to limit the application. Those skilled in the art will understand that the variations of the application will be included in the scope of the claims herein.

Claims

1. A variable downhole hydraulic hoist, characterized by: The utility model provides a kind of wellbore equipment lifting device, including walking base (1), hydraulic pump (2), hydraulic support (3), crossbeam (4), lifting frame (5), hydraulic rod (6), lifting chain (7), hook (8), supporting mechanism (9) and support mechanism (10), walking base (1) is two and symmetrical, and the side of walking base (1) far from each other is connected with hydraulic pump (2), and the upper side of walking base (1) is connected with hydraulic support (3), and the top of hydraulic support (3) is connected with crossbeam (4), and the left and right sides of crossbeam (4) are connected with the hydraulic rod (6) of symmetrical setting, and the extension end of hydraulic rod (6) is connected with lifting frame (5), and lifting frame (5) is slidably connected with crossbeam (4), and the lower side of lifting frame (5) is rotatably connected with the lifting chain (7) of symmetrical setting, and the bottom of lifting chain (7) is rotatably connected with hook (8), and walking base (1) is equipped with the supporting mechanism (9) of the bottom of wellbore equipment, and supporting mechanism (9) is equipped with support mechanism (10); Supporting mechanism (9) includes mounting seat (91), first hydraulic cylinder (92), first rotating plate (93) and supporting plate (94), and the side of walking base (1) close to each other is connected with mounting seat (91), and the upper side of mounting seat (91) is connected with first hydraulic cylinder (92), and the extension end of first hydraulic cylinder (92) is rotatably connected with first rotating plate (93), and the upper side of first rotating plate (93) is connected with supporting plate (94), and first rotating plate (93) is rotated to drive supporting plate (94) to rotate; It also includes stable mechanism (11) for pressing and stabilizing the left and right sides of the hoisted wellbore equipment, and stable mechanism (11) includes support seat (111), second hydraulic cylinder (112), push rod (113) and stable push plate (114), and the top of walking base (1) is connected with support seat (111), and the upper part of support seat (111) is connected with second hydraulic cylinder (112), and the extension end of second hydraulic cylinder (112) is connected with push rod (113), and the side of push rod (113) close to each other is connected with stable push plate (114); It also includes unfolding mechanism (12) for automatically rotating first rotating plate (93), and unfolding mechanism (12) includes unfolding push frame (121), guide rod (122), sliding plate (123), unfolding rotating rod (124) and torsion spring (125), and the upper side of push rod (113) is connected with unfolding push frame (121), and the upper side of walking base (1) is connected with guide rod (122), and the upper side of guide rod (122) is slidably connected with sliding plate (123), and the top of first rotating plate (93) is connected with unfolding rotating rod (124), and unfolding rotating rod (124) is in extrusion with adjacent unfolding push frame (121), and the upper part of sliding plate (123) is connected with torsion spring (125) between adjacent first rotating plate (93), and first rotating plate (93) moves upwards to drive sliding plate (123) to move up and down by torsion spring (125).

2. A variable downhole hydraulic hoisting device according to claim 1, characterized in that: The lower part of the walking base (1) is provided with a sliding groove, which can be connected with the underground moving track and move along the underground moving track.

3. A variable downhole hydraulic hoisting device according to claim 2, characterized in that: The lower part of the supporting plate (94) moves to the bottom of the underground equipment, and then the first hydraulic cylinder (92) lifts the first rotating plate (93) to drive the supporting plate (94) to move upwards and contact with the bottom of the underground equipment, thereby supporting and stabilizing the bottom of the underground equipment and improving the safety and stability of lifting.

4. A variable downhole hydraulic hoisting device according to claim 3, characterized in that: The supporting mechanism (10) comprises sliding rails (101), first supporting plates (102) and clamping blocks (103). The left and right sides of the walking base (1) are connected with the sliding rails (101), the sliding rails (101) are connected with the first supporting plates (102), and the lower part of the supporting plate (94) is connected with the clamping blocks (103). The clamping blocks (103) can be connected with the adjacent first supporting plates (102). The supporting plate (94) rotates to drive the clamping blocks (103) to rotate, and the clamping blocks (103) are connected with the adjacent first supporting plates (102). The first supporting plates (102) and the clamping blocks (103) support and strengthen the lower part of the supporting plate (94) to avoid deformation of the lower part of the supporting plate (94) affecting the stability of the supporting.

5. A variable downhole hydraulic hoisting device according to claim 4, characterized in that: The second hydraulic cylinder (112) controls the stable push plate (114) to move closer to each other through the push rod (113) to press and stabilize the left and right sides of the hoisted underground equipment.

6. A variable downhole hydraulic hoisting device according to claim 5, characterized in that: When the push rod (113) is activated, the unfolding push frame (121) moves, the unfolding push frame (121) drives the unfolding rotating rod (124), the unfolding rotating rod (124) automatically drives the first rotating plate (93) to rotate, and the first rotating plate (93) rotates to deform the torsional spring (125). When the unfolding rotating rod (124) is separated from the unfolding push frame (121), the torsional spring (125) rebounds to automatically control the first rotating plate (93) to rotate and reset.

7. A variable downhole hydraulic hoisting device according to claim 6, characterized in that: The anti-dropping mechanism (13) is also provided for limiting and stabilizing the hook (8). The anti-dropping mechanism (13) comprises guide plates (131), lifting plates (132), anti-dropping plates (133) and fastening screws (134). The left and right sides of the walking base (1) are connected with the guide plates (131), the guide plates (131) are connected with the lifting plates (132), the lifting plates (132) are connected with the anti-dropping plates (133), and the lifting plates (132) are connected with the fastening screws (134). The fastening screws (134) are connected with the adjacent anti-dropping plates (133). The lifting plates (132) move up and down on the guide plates (131) to drive the anti-dropping plates (133) to move. The anti-dropping plates (133) move left and right on the lifting plates (132) to adapt to the position of the hook (8) and limit and stabilize the hook (8). At the same time, the fastening screws (134) limit and fix the anti-dropping plates (133) to improve the stability and safety.

8. A variable downhole hydraulic hoisting device according to claim 7, characterized in that: Also include the limit mechanism (14) for the lower part of the downhole hoisting equipment is stable, limit mechanism (14) including the second support plate (141), the second rotating plate (142), the lead screw (143), the rotating wheel (144) and the limit disc (145), the walking base (1) is connected with the second support plate (141) on both sides, the second support plate (141) is rotatably connected with the second rotating plate (142), the second rotating plate (142) is threadedly connected with the lead screw (143), the lead screw (143) is connected with the rotating wheel (144) on the side away from each other, the lead screw (143) is rotatably connected with the limit disc (145) on the side close to each other, rotating the rotating wheel (144) to drive the lead screw (143) to rotate, the lead screw (143) rotates on the second rotating plate (142) to move forward and backward, when the lead screw (143) is close to each other, the limit disc (145) is contacted with the lower part of the hoisted downhole equipment, and the lower part of the hoisted downhole equipment is stable.

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