Underground cable shearing device for oil exploitation

Abstract

The utility model relates to the technical field of underground cable shearing, in particular to an underground cable shearing device for oil exploitation, which comprises a driving mechanism, a clamping mechanism and a shearing mechanism, a limiting frame is arranged below the driving mechanism, the clamping mechanism is positioned below the driving mechanism, and the shearing mechanism is positioned on the inner side of the limiting frame. The threaded plate drives the pushing frame and the sliding frame to move downwards, so that the three clamping arms buckle and press surrounding cables needing to be sheared to the outer side of the clamping frame, the cables buckled and pressed nearby the limiting frame are extruded and cut off along with continuous downward movement of the pushing frame, and then the whole device is reset to conduct next shearing treatment.

Description

Technical Field

[0001] This utility model relates to the field of downhole cable cutting technology, and in particular to a downhole cable cutting device for oil extraction. Background Technology

[0002] According to the patent document with announcement number CN221312320U, the micro electric push rod drives the support plate to detach from the bottom of the top seat. The top seat releases elastic potential energy downward by the energy storage mechanism that has completed the energy storage. The high potential energy elastic force drives the top seat to forcefully impact the inclined side of the blade holder through the upper inclined platform. The blade one and blade two on the blade holder approach each other to complete the precise cutting of the cable.

[0003] The patent document states that when cutting cables, the cable can only be effectively cut during the initial release of elastic potential energy. With subsequent continuous release of elastic potential energy, the cutting force gradually decreases. Furthermore, each release can only complete one cable cut. For deeper oil wells, if multiple cuts are required, the aforementioned structure needs to be pulled out of the well and recharged before operation, which is obviously very inconvenient and time-consuming. In addition, for thicker cables, relying on the release of elastic potential energy as a power source for cutting may not yield particularly ideal cutting results. Utility Model Content

[0004] The purpose of this invention is to provide a downhole cable cutting device for oil extraction in order to solve the above-mentioned problems.

[0005] This utility model achieves the above objectives through the following technical solutions:

[0006] A downhole cable shearing device for oil extraction includes a drive mechanism, a limit frame below the drive mechanism, a clamping mechanism, and a shearing mechanism. The clamping mechanism is located below the drive mechanism, and the shearing mechanism is located inside the limit frame.

[0007] The clamping mechanism includes a clamping frame, a sliding frame slidably connected to the inner side of the clamping frame, a compression spring fixed to the top of the sliding frame, three arc-shaped slots opened at the location of the clamping frame and a support shaft fixed in each arc-shaped slot, a clamping arm rotatably connected to the outer side of each support shaft, a spiral groove opened at the end of the clamping arm near the support shaft, and a protruding post fixed at the end of the sliding frame near the support shaft.

[0008] The shearing mechanism includes a threaded plate with a screw threaded to the center. A pusher is fixed to the bottom of the threaded plate, and two pusher components are provided at the lower end of the pusher. Two symmetrically arranged shearing blades are provided on the lower side of the pusher components, and a guide seat is fixed to the bottom of each shearing blade.

[0009] Preferably, the threaded plate is slidably connected inside the clamping frame, the lower end of the pusher is slidably connected to the inner side of the sliding frame, and the upper end of the screw is rotatably connected to the top of the clamping frame.

[0010] Preferably, the bottom of the clamping frame has a sliding hole for the sliding frame to extend, and the inner side of the bottom of the sliding frame has a notch.

[0011] Preferably, the upper end of the limiting frame is fixedly connected to one end of the sliding frame that extends out of the clamping frame, and the bottom of the limiting frame is provided with a groove for the two guide seats to slide.

[0012] Preferably, the jacking assembly includes a first link and a second link, which are hinged to each other. Both the first link and the second link are hinged to a connecting seat at their lower ends, and a return spring is fixed to the bottom of the two connecting seats.

[0013] Preferably, the shearing blade is fixedly connected to the connecting seat, and the return spring is located below the shearing blade.

[0014] Preferably, the drive mechanism includes a lifting cylinder, the lower end of which is fixedly connected to the upper end of the clamping frame. A hydraulic motor is installed inside the lifting cylinder and is fixedly connected to the top of the clamping frame. A hydraulic oil tank is installed on the upper side of the hydraulic motor, and a hydraulic pump is installed on the upper side of the hydraulic oil tank. Both the hydraulic pump and the hydraulic oil tank are fixed inside the lifting cylinder.

[0015] The advantages compared with the existing technology are as follows: the threaded plate drives the pusher and sliding frame to move downward, so that the three clamping arms can clamp the cables to be cut around them to the outside of the clamping frame. As the pusher continues to move downward, the cables clamped near the limit frame are squeezed and cut. Then the whole device is reset and can be used for the next cutting process. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is an exploded view of an underground cable cutting device for oil extraction as described in this utility model;

[0018] Figure 2 This is a perspective view of an underground cable cutting device for oil extraction as described in this utility model;

[0019] Figure 3 This is a front view of a downhole cable cutting device for oil extraction as described in this utility model;

[0020] Figure 4 yes Figure 3 Sectional view at point BB;

[0021] Figure 5 This is a schematic diagram of the clamping arm of the downhole cable shearing device for oil extraction described in this utility model in the open state.

[0022] Figure 6 This is a schematic diagram of the shearing mechanism structure of an oil well cable shearing device according to the present invention;

[0023] Figure 7 This is a schematic diagram of the limiting frame structure of an oil well cable cutting device according to the present invention;

[0024] Figure 8 This is a schematic diagram of the protruding column structure of an oil well cable cutting device according to the present invention;

[0025] Figure 9 This is a schematic diagram of the support shaft structure of an oil well cable shearing device according to the present invention.

[0026] The annotations in the attached figures are explained as follows:

[0027] 1. Drive mechanism; 2. Clamping mechanism; 3. Shearing mechanism; 4. Limiting frame; 11. Lifting cylinder; 12. Hydraulic pump; 13. Hydraulic oil tank; 14. Hydraulic motor; 21. Clamping frame; 22. Support shaft; 23. Clamping arm; 24. Sliding frame; 25. Protruding column; 26. Compression spring; 231. Spiral groove; 31. Screw; 32. Threaded plate; 33. Pushing frame; 34. First connecting rod; 35. Second connecting rod; 36. Connecting seat; 37. Return spring; 38. Shearing blade; 39. Guide seat. Detailed Implementation

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

[0029] The present invention will be further described below with reference to the accompanying drawings:

[0030] like Figures 1-9As shown, an oil well cable cutting device includes a drive mechanism 1, a limit frame 4 below the drive mechanism 1, a clamping mechanism 2 and a cutting mechanism 3, the clamping mechanism 2 being located below the drive mechanism 1 and the cutting mechanism 3 being located inside the limit frame 4.

[0031] In this embodiment: the clamping mechanism 2 includes a clamping frame 21, a sliding frame 24 is slidably connected to the inner side of the clamping frame 21, a compression spring 26 is fixed to the top of the sliding frame 24, the clamping frame 21 has three arc-shaped slots at the sliding frame 24, and a support shaft 22 is fixed in each arc-shaped slot. A clamping arm 23 is rotatably connected to the outer side of each support shaft 22. A spiral groove 231 is opened at the end of the clamping arm 23 near the support shaft 22. A protrusion 25 is fixed at the end of the sliding frame 24 near the support shaft 22. A groove for allowing the sliding arm 23 to slide is opened at the bottom of the clamping frame 21. The sliding frame 24 extends through a sliding hole, and a notch is provided on the inner side of the bottom of the sliding frame 24. When the sliding frame 24 extends through the sliding hole at the bottom of the clamping frame 21, the three protrusions 25 on the sliding frame 24 will slide from top to bottom along the spiral grooves 231 of the three clamping arms 23. The sliding of the protrusions 25 in the spiral grooves 231 causes the clamping arms 23 to rotate around the support shaft 22. Then, as the sliding frame 24 continues to move downward, the three clamping arms 23 will hug the cable around it and press it against the outside of the clamping frame 21, thereby completing the clamping and fixing of the entire cable.

[0032] In this embodiment: the shearing mechanism 3 includes a threaded plate 32, with a screw 31 threadedly connected to the center of the threaded plate 32. A pusher frame 33 is fixed to the bottom of the threaded plate 32. Two pusher components are provided at the lower end of the pusher frame 33. Two symmetrically arranged shearing blades 38 are provided on the lower side of the pusher components. A guide seat 39 is fixed to the bottom of each shearing blade 38. The threaded plate 32 is slidably connected inside the clamping frame 21. The lower end of the pusher frame 33 is slidably connected to the inner side of the sliding frame 24. The upper end of the screw 31 is rotatably connected to the top of the clamping frame 21. The limiting frame 4... The upper end is fixedly connected to the end of the sliding frame 24 that extends out of the clamping frame 21. The bottom of the limiting frame 4 is provided with a sliding groove for the two guide seats 39 to slide. The hydraulic motor 14 drives the screw 31 to rotate on the top of the clamping frame 21. The rotation of the screw 31 drives the threaded plate 32 to move downward along the inside of the clamping frame 21. The downward movement of the threaded plate 32 drives the pusher 33 to move synchronously. At the same time, the threaded plate 32 pushes the compression spring 26 to make the lower end of the sliding frame 24 extend out of the sliding hole at the bottom of the clamping frame 21.

[0033] In this embodiment, the pushing assembly includes a first connecting rod 34 and a second connecting rod 35, which are hinged to each other. The lower ends of the first connecting rod 34 and the second connecting rod 35 are both hinged to connecting seats 36. The bottom of the two connecting seats 36 is fixed with a return spring 37. The shearing blade 38 is fixedly connected to the connecting seats 36. The return spring 37 is located below the shearing blade 38. The pushing frame 33 extends one end of the sliding frame 24 to push the upper ends of the second connecting rod 35 and the first connecting rod 34. Then, the upper ends of the first connecting rod 34 and the second connecting rod 35 slide away from each other at the bottom of the pushing frame 33. Then, the lower ends of the first connecting rod 34 and the second connecting rod 35 will drive the two connecting seats 36 to move away synchronously, so that the two shearing blades 38 extend outward from the limiting frame 4. At the same time, during the movement, the two shearing blades 38 are prevented from tilting by the cooperation of the guide seat 39 and the slide groove, and then the cable near the limiting frame 4 is squeezed and cut.

[0034] In this embodiment: the drive mechanism 1 includes a hoisting cylinder 11, the lower end of which is fixedly connected to the upper end of the clamping frame 21. A hydraulic motor 14 is provided inside the hoisting cylinder 11, and the hydraulic motor 14 is fixedly connected to the top of the clamping frame 21. A hydraulic oil tank 13 is provided on the upper side of the hydraulic motor 14, and a hydraulic pump 12 is provided on the upper side of the hydraulic oil tank 13. Both the hydraulic pump 12 and the hydraulic oil tank 13 are fixed inside the hoisting cylinder 11. The entire device is extended into the well by hoisting the hoisting cylinder 11. At the same time, the hydraulic pump 12 supplies the hydraulic oil in the hydraulic oil tank 13 to the hydraulic motor 14, thereby driving the hydraulic motor 14 to drive the screw 31 to rotate, thus realizing a continuous power supply.

[0035] Working principle: The entire device is extended into the well by lifting the lifting cylinder 11. At the same time, the hydraulic pump 12 supplies hydraulic oil from the hydraulic oil tank 13 to the hydraulic motor 14, thereby achieving a continuous power supply. The hydraulic motor 14 drives the screw 31 to rotate on the top of the clamping frame 21. The rotation of the screw 31 drives the threaded plate 32 to move downward along the inside of the clamping frame 21. The downward movement of the threaded plate 32 drives the pusher 33 to move synchronously. At the same time, the threaded plate 32 pushes the compression spring 26 to make the lower end of the sliding frame 24 extend out of the sliding hole at the bottom of the clamping frame 21. During this process, the sliding frame 24 drives the limit frame 4 to move downward synchronously.

[0036] As the sliding frame 24 extends out of the sliding hole at the bottom of the clamping frame 21, the three protrusions 25 on the sliding frame 24 slide down along the spiral grooves 231 of the three clamping arms 23. The sliding of the protrusions 25 in the spiral grooves 231 causes the clamping arms 23 to flip and retract towards the clamping frame 21 with the support shaft 22 as the center. Thus, the clamping arms 23, away from the support shaft 22, hold the surrounding cables tightly and press them against the outside of the clamping frame 21, thereby completing the clamping and fixing of the entire cable.

[0037] Subsequently, when the upper end of the sliding frame 24 abuts against the lower end of the clamping frame 21, the sliding frame 24 no longer moves downward along the sliding hole. At this time, as the screw 31 continues to rotate, the threaded plate 32 continues to slide downward. At the same time, the pusher 33 extends downward along the bottom recess of the sliding frame 24. During this process, the compression spring 26 begins to be compressed. Simultaneously, the pusher 33 extends one end of the sliding frame 24 to push the upper ends of the second connecting rod 35 and the first connecting rod 34, thereby causing the upper ends of the first connecting rod 34 and the second connecting rod 35 to be at the bottom of the pusher 33. The parts slide away from each other, and the lower ends of the first link 34 and the second link 35 will drive the two connecting seats 36 to move away from each other synchronously. At the same time, the return springs 37 at the bottom of the two connecting seats 36 are stretched, so that the two shear blades 38 extend outward from the limit frame 4. During the movement of the two shear blades 38, the guide seat 39 and the slide groove are used to prevent the shear blades 38 from tilting. As the shear blades 38 extend outward from the limit frame 4, they squeeze and cut the cable that is held tightly by the three clamping arms 23 on the outside of the clamping frame 21.

[0038] After the cable is completely cut, the hydraulic motor 14 drives the screw 31 to rotate in the opposite direction to move the threaded plate 32 upward. The threaded plate 32 drives the pusher 33 to move upward. At this time, the pushing force of the upper end of the first connecting rod 34 and the second connecting rod 35 gradually decreases. The two connecting seats 36 are brought closer to each other by the action of the return spring 37. Then the upper and lower ends of the first connecting rod 34 and the second connecting rod 35 are closed together, and the two shearing blades 38 are retracted into the limit frame 4.

[0039] As the threaded plate 32 continues to move upward, the threaded plate 32 drives the compression spring 26 to pull the sliding frame 24 towards the upper side of the clamping frame 21, thereby pulling the lower end of the sliding frame 24 back into the clamping frame 21. During this process, the protrusion 25 will move upward along the spiral groove 231 of the clamping arm 23. At this time, the three clamping arms 23 will flip outward and open, ready for the next shearing operation.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A downhole cable cutting device for oil extraction, comprising a drive mechanism (1), wherein a limiting frame (4) is provided below the drive mechanism (1), characterized in that: It also includes a clamping mechanism (2) and a shearing mechanism (3), wherein the clamping mechanism (2) is located below the driving mechanism (1) and the shearing mechanism (3) is located inside the limiting frame (4); The clamping mechanism (2) includes a clamping frame (21), a sliding frame (24) is slidably connected to the inner side of the clamping frame (21), a compression spring (26) is fixed to the top of the sliding frame (24), the clamping frame (21) has three arc-shaped slots at the sliding frame (24), and a support shaft (22) is fixed in each arc-shaped slot. A clamping arm (23) is rotatably connected to the outer side of each support shaft (22). A spiral groove (231) is opened at one end of the clamping arm (23) near the support shaft (22), and a protrusion (25) is fixed at one end of the sliding frame (24) near the support shaft (22). The shearing mechanism (3) includes a threaded plate (32), a screw (31) is threadedly connected to the center of the threaded plate (32), a pusher (33) is fixed at the bottom of the threaded plate (32), two pusher components are provided at the lower end of the pusher (33), and two symmetrically arranged shearing blades (38) are provided on the lower side of the pusher components. Each shearing blade (38) is fixed with a guide seat (39) at the bottom.

2. The downhole cable cutting device for oil extraction according to claim 1, characterized in that: The threaded plate (32) is slidably connected inside the clamping frame (21), the lower end of the pusher (33) is slidably connected inside the sliding frame (24), and the upper end of the screw (31) is rotatably connected to the top of the clamping frame (21).

3. The downhole cable cutting device for oil extraction according to claim 1, characterized in that: The bottom of the clamping frame (21) is provided with a sliding hole for the sliding frame (24) to extend out, and the inner side of the bottom of the sliding frame (24) is provided with a notch.

4. The downhole cable cutting device for oil extraction according to claim 1, characterized in that: The upper end of the limiting frame (4) is fixedly connected to one end of the sliding frame (24) that extends out of the clamping frame (21), and the bottom of the limiting frame (4) is provided with a sliding groove for the two guide seats (39) to slide.

5. The downhole cable cutting device for oil extraction according to claim 1, characterized in that: The jacking assembly includes a first link (34) and a second link (35). The first link (34) and the second link (35) are hinged to each other. The lower ends of the first link (34) and the second link (35) are both hinged to a connecting seat (36). The bottom of the two connecting seats (36) is fixed with a return spring (37).

6. The downhole cable cutting device for oil extraction according to claim 5, characterized in that: The shearing blade (38) is fixedly connected to the connecting seat (36), and the reset spring (37) is located below the shearing blade (38).

7. The downhole cable cutting device for oil extraction according to claim 1, characterized in that: The drive mechanism (1) includes a lifting cylinder (11), the lower end of which is fixedly connected to the upper end of the clamping frame (21). A hydraulic motor (14) is provided inside the lifting cylinder (11), and the hydraulic motor (14) is fixedly connected to the top of the clamping frame (21). A hydraulic oil tank (13) is provided on the upper side of the hydraulic motor (14), and a hydraulic pump (12) is provided on the upper side of the hydraulic oil tank (13). Both the hydraulic pump (12) and the hydraulic oil tank (13) are fixed inside the lifting cylinder (11).

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