Well entering cable protection device for electric pump well

Abstract

The invention relates to an electric pump well entering cable protection device which comprises a guiding and tensioning mechanism used for tensioning a cable and guiding the cable to move, an inner and outer bench worker operation position cable sheath used for protecting the cable at an inner and outer bench worker operation position, and a tubing head four-way inner cable sheath used for protecting the cable at a tubing head four-way position. The guiding and tensioning mechanism comprises a guiding structure with an arc-shaped guiding surface and a plurality of sliding frames, a sliding seat and a driving assembly for driving the sliding seat to slide are arranged on the sliding frames, the sliding seat is rotationally connected with a roller, and a cable penetrates through a space separated by the roller and the guiding surface; the inner and outer bench worker operation position cable sheath is arranged on the inner and outer bench worker operation table and comprises a pipe body allowing a cable to penetrate through, the tubing head four-way inner cable sheath is placed on a step in the tubing head four-way, the tubing head four-way inner cable sheath comprises a barrel allowing a power pump tubular column and the cable to penetrate through, and rubber pads are arranged on the inner wall of the pipe body and the inner wall of the barrel. The cable is protected at key parts and weak links, and the service life of the cable can be prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric pumping well oil production, and particularly relates to a protection device for an electric pumping well cable. BACKGROUND

[0002] For an oil production well using an electric submersible pump for lifting (hereinafter referred to as an electric pumping well), the electric submersible pump needs to be lowered into the well for 800 to 3000 m during the oil production process, and a high-temperature and high-pressure cable is simultaneously lowered into the well outside the oil pipe to provide power for the electric motor of the electric submersible pump. However, during the downhole operation construction process of the cable lowered into the well, the cable is often subjected to various mechanical damages, which damages the insulating layer of the cable or reduces the strength of the insulating layer of the cable, resulting in reduced or lost insulation performance of the cable. When the electric pumping well is completed, the motor cannot operate, and the pipe string must be pulled out for cable repair or replacement, and rework operation is performed. However, each rework operation will cause huge economic losses, and the oil production plant will cause several reworks per year due to the damage of the cable lowered into the well, which affects the efficiency of the oil production plant.

[0003] At present, the cable protection measures for the electric pumping well almost remain at the management level, and there is almost no technical equipment measure. The protective equipment used only hangs a guide wheel on the drilling rig, and the guide wheel guides the cable to enter the well through the wellhead from the ground drum. The structure has the following problems:

[0004] (1) The guide wheel is a full-iron structure with a cable passing channel in a semicircle. When the cable passes through the guide wheel, the cable and the guide wheel are in hard contact, and sliding friction occurs between them, which can cause damage to the cable armor. When the forces on the left and right ends of the cable on both sides of the guide wheel are unbalanced, the cable will slide to one side. At this time, manual dragging is needed to reset the cable, but manual dragging of the cable often causes the cable to bend and produce permanent deformation, so that the cable cannot restore the initial straight shape. Subsequently, when the cable is lowered into the well, the cable is easy to rub and hang with the structure such as the well wall and the step.

[0005] (2) There are several critical parts and weak links (including the guide wheel turning part in the middle of the derrick, the wellhead or the fitter operating part on the drilling platform, the oil pipe hanging step inside the wellhead four-way valve, etc.) on the moving path of the cable. When the cable passes through the above-mentioned parts, the contact form is also hard contact. When the cable passes quickly, the protective layer of the cable is also easy to be damaged. The problems caused by the process include: A. sliding friction at the turning part of the guide wheel; B. collision with hard iron objects such as hydraulic tongs, elevator, tension tongs, locking tongs, hammer, and oil pipe joint at the inner (outer) fitter operating part on the wellhead or drilling platform; C. when the electric pumping pipe string is lowered into the well, the cable is bundled on the side of the electric pumping pipe string in a ring-shaped manner by means of a special clamp, and the cable rubs against the step inside the wellhead four-way valve for suspending the oil pipe hanger (i.e. the radish head) when the cable and the electric pumping pipe string pass through the step.

[0006] (Three) the vital part and weak link on the cable moving path lack effective protection device, the cable damage rate is higher.

[0007] (Four) because the staff is easy to produce fatigue when working, and the action stability is limited, and only relies on the warning education to the operator, cannot prevent the illegal cable. SUMMARY

[0008] The present application solves the problem of lacking the device for protecting the cable of the electric pump well, which often needs to be reworked, and affects the benefit of the oil production plant, provides an electric pump well cable protection device, to solve the technical problem, the guide and tensioning mechanism is used to guide the cable sliding, and in the process of cable sliding, the rolling friction between the cable and the roller is not easy to wear.And the position of the roller is adjusted by the driving assembly, so that the cable is tightly pressed between the roller and the guide surface, and the pressure on the cable can also be adjusted, so that the cable remains in tension in the air and is not easy to slide off.The cable sheath at the inner and outer tong operating position and the cable sheath in the tubing head cross are respectively contacted with the cable through rubber pads at the inner and outer tong operating position and the tubing head cross, which can reduce the wear and impact of the cable at these two positions, prolong the service life of the cable, reduce the rework frequency, and improve the benefit of the oil production plant.

[0009] To solve the above technical problems, the technical scheme of the present application is as follows:

[0010] An electric pump well cable protection device, comprising a guide and tensioning mechanism for tensioning and guiding the movement of the cable, an inner and outer tong operating position cable sheath for protecting the cable at the inner and outer tong operating position, and a tubing head cross inner cable sheath for protecting the cable at the tubing head cross, wherein:

[0011] The guide and tensioning mechanism comprises a guide structure with an arc-shaped guide surface and a plurality of sliding racks fixedly connected with the guide structure, the guide surface is an upper concave circular arc surface for guiding the cable to slide along an arc trajectory, the sliding racks are uniformly arranged around the axis of the circular arc where the guide surface is located, each sliding rack is arranged in the radial direction of the circular arc where the guide surface is located, a sliding seat sliding in the length direction of the sliding rack and a driving assembly driving the sliding seat to slide are arranged on the sliding rack, the sliding seat is lower than the guide surface, and each sliding seat is rotatably connected with a roller, the rotation axis of the roller is parallel to the axis of the circular arc where the guide surface is located, and the space between the roller and the guide surface is provided for the cable to pass through;

[0012] The inner and outer tong operating position cable sheath is arranged at the inner and outer tong operating position, and the inner and outer tong operating position cable sheath comprises a pipe body through which the cable passes, and a notch is formed in the side surface of the pipe body and penetrates the pipe body in the length direction of the pipe body;

[0013] The cable sheath in the tubing head cross is placed on a step in the tubing head cross in a vertical direction, and the cable sheath in the tubing head cross comprises a cylinder through which the electric pump pipe string and the cable pass, and an opening is formed in the side of the cylinder and penetrates the cylinder along the length direction of the cylinder,

[0014] The inner wall of the cylinder and the inner wall of the cylinder are provided with rubber pads, the cylinder is in contact with the cable through the rubber pad on the inner side of the cylinder, and the cylinder is in contact with the electric pump pipe string and the cable through the rubber pad on the inner side of the cylinder.

[0015] Preferably, the side of the roller and / or the guide surface of the guide structure are also provided with rubber pads and abut against the outer side of the cable through the rubber pads.

[0016] Preferably, the sliding frame is also provided with a return spring, one end of the return spring is connected with the sliding frame, and the other end is connected with the sliding seat, and the return spring is always in a compressed / stretched state during the sliding of the sliding seat.

[0017] Preferably, the driving assembly is a pneumatic cylinder, a hydraulic cylinder or an electric cylinder.

[0018] Preferably, the driving assembly is a hydraulic cylinder, and the hydraulic cylinder is in communication with a low-pressure hydraulic source in a drilling and workover site.

[0019] Preferably, for the cable sheath at the inner and outer bench work operation position, the side of the cylinder is provided with a anti-falling structure for preventing the cable from falling off from the cylinder, and the anti-falling structure comprises a detachable clamp and a rope tied on the side of the cylinder.

[0020] Preferably, for the cable sheath in the tubing head cross, the inner diameter of the rubber pad on the inner side of the cylinder is greater than the maximum diameter of the horizontal projection of the electric pump pipe string and the special clamp.

[0021] Preferably, for the cable sheath in the tubing head cross, the rubber pad on the inner side of the cylinder extends upwardly to protrude from the top end of the cylinder.

[0022] Preferably, the cable sheath in the tubing head cross is configured such that when the electric pump pipe string is lifted, the gravity of the cable sheath in the tubing head cross is greater than the friction force between the electric pump pipe string and the cable sheath in the tubing head cross.

[0023] Preferably, the top of the guide structure is provided with a lifting ring.

[0024] The beneficial technical effects of the technical scheme of the present application are as follows:

[0025] The guiding and tensioning mechanism is used for guiding the cable to slide, and comprises a guiding structure with an arc-shaped guiding surface and a plurality of sliding seats in sliding cooperation with the guiding structure. A roller is further installed on the sliding seat. The cable slides between the roller and the guiding surface. The cable is mounted on the roller and moves with rolling friction between the roller and the cable, so that the cable is not easy to be abraded. The guiding and tensioning mechanism further adjusts the position of the roller by using a driving assembly, controls the movement of the sliding seat, adjusts the position of the roller and the cable, so that the cable is tightly pressed between the roller and the guiding surface. The pressure of the roller and the guiding surface on the cable enables the cable to be kept in a tensioned state in the air, so that the cable is not easy to slide down and does not need to be manually pulled.

[0026] The inner and outer tongs operating position cable sheath comprises a pipe body for the cable to pass through, and the tubing head four-way inner cable sheath comprises a barrel for the electric pump pipe string and the cable to pass through together. The inner sides of the pipe body and the barrel are provided with rubber pads, which are respectively in contact with the cable at the inner and outer tongs operating position and the tubing head four-way position through the rubber pads. The abrasion and impact of the cable at these two positions can be reduced, the service life of the cable is prolonged, the number of rework caused by cable damage is reduced, and the efficiency of the oil production plant is improved.

[0027] In addition, since the guiding and tensioning mechanism, the inner and outer tongs operating position cable sheath and the tubing head four-way inner cable sheath are used to protect the cable, the important parts and weak links in the cable movement path are protected, the work burden of the staff in the operation is reduced, the work efficiency is improved, the staff can reasonably allocate attention, and further protection measures are provided for the cable.

[0028] The rubber pads provided on the side surface of the roller can further reduce the abrasion between the side surface of the roller and the cable. In addition, when the rubber pads are provided on the side surface of the roller and the guiding surface, the cable is tightly pressed between the roller and the guiding surface, and the rubber pads can also increase the friction between the cable and the roller and the guiding surface, thereby improving the stability of the cable.

[0029] When the driving assembly is selected as a hydraulic cylinder, the hydraulic cylinder can be directly communicated with the low-pressure hydraulic source provided in the drilling and workover site, and no additional power source is needed, which is convenient to use.

[0030] When the electric pump pipe string is lifted, the gravity of the tubing head four-way inner cable sheath is greater than the friction between the electric pump pipe string and the tubing head four-way inner cable sheath. This is to prevent the electric pump pipe string from lifting the tubing head four-way inner cable sheath out of the wellhead. The tubing head four-way inner cable sheath can be fixed in the four-way inner part by its own gravity without other fixing methods, so as to ensure that the use of the tubing head four-way inner cable sheath can stably prevent the cable from being scratched by the step. BRIEF DESCRIPTION OF DRAWINGS

[0031] Fig. 1The structure diagram of the guiding and tensioning mechanism in the embodiment of the present application is shown.

[0032] Fig. 2 The structure diagram of the cable sheath at the inside and outside tool joint operation in the embodiment of the present application is shown.

[0033] Fig. 3 The structure diagram of the cable sheath in the tubing head cross in the embodiment of the present application is shown.

[0034] Markings in the drawing:

[0035] 1-guiding structure; 11-guiding surface; 12-sliding frame; 13-sliding seat; 14-rolling cylinder; 15-driving assembly; 16-return spring; 17-suspender; 2-pipe body; 21-notch; 3-cylinder body; 31-opening; 4-rubber pad. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the present application more clear, the following will make further detailed description of the electric pump well into well cable protection device of the present application in combination with the drawings and specific embodiments. According to the following description, the advantages and features of the present application will be more clear. It should be noted that the drawings are very simplified and all use non-precise proportions, only to facilitate, clear and assist the purpose of explaining the embodiments of the present application. In order to make the purpose, features and advantages of the present application more obvious and easy to understand, please refer to the drawings. It should be known that the structure, proportion, size and the like shown in the drawings of the present specification are only used to cooperate with the content disclosed in the specification, so that the person skilled in the art can understand and read, and not to limit the limited conditions of the implementation of the present application, so it does not have the technical essence, any modification of structure, change of proportion relationship or adjustment of size, without affecting the effect and purpose that can be produced by the present application, should still fall within the scope of the technical content disclosed by the present application.

[0037] The following will combine the drawings and specific embodiments to elaborate the technical scheme of the electric pump well into well cable protection device of the present application. Figs. 1 to 3

[0038] Embodiment

[0039] As shown in the drawings, the electric pump well into well cable protection device of the present embodiment comprises a guiding and tensioning mechanism for tensioning and guiding the movement of the cable, a cable sheath at the inside and outside tool joint operation for protecting the cable at the inside and outside tool joint operation, and a cable sheath in the tubing head cross for protecting the cable at the tubing head cross. Figs. 1 to 3

[0040] ​​For the guide and tensioning mechanism, the guide and tensioning mechanism comprises a guide structure 1 with an arc-shaped guide surface 11 and a plurality of sliding frames 12 fixedly connected with the guide structure 1. A lifting ring 17 is welded on the top of the guide structure 1 to facilitate lifting the guide and tensioning mechanism. The guide structure 1 in the embodiment is an arc-shaped plate, and the lower surface of the arc-shaped plate is the guide surface 11, which is an upper concave arc surface guiding the cable to slide along an arc-shaped track. The sliding frames 12 in the embodiment are located between the guide surface 11 and the axis of the circular arc where the guide surface 11 is located, and there are six sliding frames 12 in total, which are uniformly arranged around the axis of the circular arc where the guide surface 11 is located. Each sliding frame 12 extends in the radial direction of the circular arc where the guide surface 11 is located, and the end of each sliding frame 12 close to the guide surface 11 is fixedly welded to the arc-shaped plate. The end of the sliding frame 12 away from the axis of the circular arc of the guide surface 11 is fixedly connected to the same annular frame, and the annular frame is fixedly connected with the guide structure 1.

[0041] Each sliding frame 12 is provided with a through groove in the length direction of the sliding frame 12, and a sliding seat 13 sliding in the length direction of the sliding frame 12 is installed in the through groove of the sliding frame 12. The sliding seat 13 is fixedly connected with a shaft body parallel to the axis of the circular arc where the guide surface 11 is located, the shaft body penetrates through the sliding seat 13, and a roller 14 rotating around the shaft body is installed. The roller 14 is located below the guide surface 11, and the space between the roller 14 and the guide surface 11 is provided for the cable to pass through. A long circular hole is also provided on the sliding frame 12 for the shaft body to pass through, and the length direction of the long circular hole is parallel to the length direction of the sliding frame 12, which can limit the sliding range of the shaft body, the sliding seat 13 and the roller 14.

[0042] Further, each sliding frame 12 is also provided with a driving assembly 15 driving the sliding seat 13 to slide. The driving assembly 15 can be any straight stroke driver such as a pneumatic cylinder, a hydraulic cylinder or an electric cylinder. The driving assembly 15 in the embodiment is preferably a hydraulic cylinder, the piston rod of the hydraulic cylinder is connected with the sliding seat 13, and the cylinder body of the hydraulic cylinder is fixedly welded to the sliding frame 12 through a rod structure. When the hydraulic cylinder is used as the driving assembly 15, the hydraulic pipeline of the hydraulic cylinder can be directly communicated with the low-pressure hydraulic source on the drilling and workover site, and the hydraulic cylinder can be conveniently controlled remotely by controlling the operation of the low-pressure hydraulic source, without the need for additional power source, which is convenient to use.

[0043] The guiding and tensioning mechanism is used for guiding the cable to move in a turning direction, and comprises a guiding structure 1 with an arc-shaped guiding surface 11 and a plurality of sliding seats 13 in sliding cooperation with the guiding structure 1, wherein a roller 14 is further arranged on the sliding seat 13, and the cable slides between the roller 14 and the guiding surface 11, and the cable is arranged on the roller 14 to move and roll with the roller 14, so that the cable is not easy to be abraded. The guiding and tensioning mechanism further adjusts the position of the roller 14 by using a driving assembly 15 to control the movement of the sliding seat 13, adjusts the position of the roller 14 and the cable, so that the cable is abutted between the roller 14 and the guiding surface 11, and the cable is kept in a tensioning state in the air by using the pressure of the roller 14 and the guiding surface 11 on the cable, so that the cable is not easy to slide down and needs not to be manually pulled back. In addition, the cable is abutted against the arc-shaped guiding surface 11 by using the roller 14, so that the cable is not easy to be permanently deformed due to excessive bending.

[0044] In addition, the sliding frame 12 is further provided with a return spring 16, which is located between the guiding surface 11 and the sliding seat 13, one end of the return spring 16 is connected with the sliding frame 12, and the other end is connected with the sliding seat 13. During the sliding of the sliding seat 13, the return spring 16 is always in a compressed / stretched state, and the sliding seat 13 has a tendency to slide towards the guiding surface 11 or away from the guiding surface 11 according to needs. The former is used for automatically tensioning the cable and automatically locking the position of the cable after the driving assembly 15 stops running; the latter is used for automatically relaxing the cable, so that the cable can be successfully tensioned and locked only by overcoming the resistance of the return spring 16 when the driving assembly 15 is running. In the embodiment, the return spring 16 is used for the latter.

[0045] In addition, the side surface of the roller 14 and / or the guiding surface 11 of the guiding structure 1 is provided with a rubber pad 4, and the rubber pad 4 is abutted against the outer side surface of the cable. The rubber pad 4 arranged on the side surface of the roller 14 can further reduce the abrasion between the roller 14 and the side surface of the cable. When the cable is abutted between the roller 14 and the guiding surface 11, the rubber pad 4 can further increase the friction between the cable and the roller 14 and the guiding surface 11, and improve the stability of the cable.

[0046] Specifically, the inner and outer bench operation cable sheath is arranged at the inner and outer bench operation table, and the inner and outer bench operation cable sheath comprises a pipe body 2 for the cable to pass through, and a gap 21 is formed in the side of the pipe body 2 and penetrates the pipe body 2 along the length direction of the pipe body 2. The inner side wall of the pipe body 2 in the embodiment is a PVC pipe to which a rubber pad 4 is also attached, the PVC pipe has an outer diameter of Ф73 mm, an inner diameter of Ф67 mm, and a thickness of 3 mm, the rubber pad 4 is bent into a side-disconnected cylindrical shape in the pipe body 2, the rubber pad 4 in the pipe body 2 has an outer diameter of Ф67 mm, an inner diameter of Ф50 mm, and a thickness of 8.5 mm, and the width of the gap 21 of the pipe body 2 and the disconnected position of the rubber pad 4 in the pipe body 2 is 25 mm. The purpose of using the PVC pipe is to facilitate the operator to easily take it and ensure that the strength of the pipe body 2 is sufficient to avoid being damaged by the tools held by the personnel, and the length of the PVC pipe is 2.0 m, which is determined according to the height characteristics of ordinary people, so that the cable is protected by the pipe body 2 within the range of the tools held by the personnel, and the cable is ensured not to be damaged.

[0047] The oil pipe head four-way inner cable sheath is vertically arranged on the step in the oil pipe head four-way, and the oil pipe head four-way inner cable sheath comprises a cylinder 3 for the electric pump pipe column and the cable to pass through, an opening 31 is formed in the side of the cylinder 3 and penetrates the cylinder 3 along the length direction of the cylinder 3, the inner wall of the cylinder 3 is also provided with a rubber pad 4, and the cylinder 3 is in contact with the electric pump pipe column and the cable through the rubber pad 4 on the inner side of the cylinder 3. The rubber pad 4 is bent into a side-disconnected cylindrical shape in the cylinder 3, the rubber pad 4 in the cylinder 3 has an inner diameter of Ф140 mm, which is slightly larger than the maximum outer diameter of the electric pump pipe column (the position where the side of the electric pump pipe column is used to bind the cable with a special clip, the maximum diameter of the electric pump pipe column and the cable and the special clip projected on the horizontal plane is Ф135 mm), so as to ensure that the electric pump pipe column passes through smoothly, the width of the opening 31 of the cylinder 3 and the disconnected position of the rubber pad 4 in the cylinder 3 is 90 mm. The thickness of the cylinder 3 is 10 mm, and the thickness of the rubber pad 4 in the cylinder 3 is 58.5 mm, which can provide sufficient soft contact for the cable, so as to ensure that the cable is not hung and squeezed by the hard oil pipe hanging step through the weak link, and the width of the gap 21 of the pipe body 2 and the disconnected position of the rubber pad 4 in the pipe body 2 is 25 mm.

[0048] The inner and outer bench operation cable sheath comprises a pipe body 2 for the cable to pass through, the oil pipe head four-way inner cable sheath comprises a cylinder 3 for the electric pump pipe column and the cable to pass through, and the inner sides of the pipe body 2 and the cylinder 3 are both provided with rubber pads 4, which are respectively in contact with the cable at the inner and outer bench operation positions and the oil pipe head four-way through the rubber pads 4, so as to reduce the wear and impact of the cable at the two positions, prolong the service life of the cable, and further reduce the rework times caused by the damage of the cable and improve the efficiency of the oil production plant.

[0049] The pipe body 2 is provided with a gap 21, so that the cable can pass through the gap 21, and the pipe body 2 can be directly sleeved on the side of the cable; the opening 31 of the barrel 3 is used for facilitating the cable with the electric pump pipe column to pass through the opening 31, so that the barrel 3 can be directly sleeved on the side, and the installation and use are facilitated.

[0050] For the cable sheath at the inner and outer bench work operation, the cable generally will not slip off from the gap 21 of the pipe body 2, but for safety, the side of the pipe body 2 is also provided with a cable slipping prevention structure which can prevent the cable from slipping off from the gap 21 of the pipe body 2, and the cable slipping prevention structure can be selected as a freely detachable clamp or a rope tied on the side of the pipe body 2.

[0051] For the cable sheath in the tubing head cross, when the cable is lowered into the well with the electric pump pipe column, the derrick, the crown block and the cable must be in a straight line, and the error is not more than 5mm; the pipe column with the cable moves strictly along the vertical direction, and the cable cannot slip out of the cable sheath in the tubing head cross.

[0052] In addition, the rubber pad 4 of the cable sheath in the tubing head cross extends upward to protrude from the top end of the barrel 3, so that when the cable passes, the cable first contacts the rubber pad 4 and will not scratch the barrel 3 of the cable sheath in the tubing head cross.

[0053] Further, the cable sheath in the tubing head cross is configured as follows: when the electric pump pipe column is lifted, the gravity of the cable sheath in the tubing head cross is greater than the friction between the electric pump pipe column and the cable sheath in the tubing head cross, so as to prevent the electric pump pipe column from taking the cable sheath in the tubing head cross out of the wellhead when the electric pump pipe column is lifted, and the cable sheath in the tubing head cross is stably fixed in the cross by its own gravity, so as to ensure that the cable sheath in the tubing head cross can be stably placed and continuously prevent the cable from being scratched by the step. In order to increase the weight of the cable sheath in the tubing head cross, the barrel 3 of the cable sheath in the tubing head cross in the embodiment is made of iron.

[0054] The technical features of the above-mentioned embodiments can be combined arbitrarily, and in order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0055] The above-mentioned embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An electrical submersible well entry cable protection device, characterized by, The application relates to a cable protection device for a drilling and workover site, which comprises a guide and tension mechanism for tensioning and guiding the movement of a cable, an inner and outer bench operation cable sheath for protecting the cable at an inner and outer bench operation position, and a tubing head cross cable sheath for protecting the cable at a tubing head cross position, wherein: The guide and tension mechanism comprises a guide structure with an arc-shaped guide surface and a plurality of sliding frames fixedly connected with the guide structure, the guide surface is an upper concave arc surface for guiding the sliding of the cable along an arc track, the sliding frames are uniformly arranged around the axis of the arc where the guide surface is located, each sliding frame is arranged along the radial direction of the arc where the guide surface is located, a sliding seat sliding along the length direction of the sliding frame is arranged on the sliding frame, a driving assembly for driving the sliding of the sliding seat is arranged on the sliding frame, the sliding seat is lower than the guide surface, and each sliding seat is rotationally connected with a roller, the rotation axis of the roller is parallel to the axis of the arc where the guide surface is located, and a space between the roller and the guide surface is used for the cable to pass through. The inner and outer bench operation cable sheath is arranged on an inner and outer bench operation platform, and the inner and outer bench operation cable sheath comprises a pipe body through which the cable passes, and a notch is formed in the side of the pipe body and penetrates the pipe body along the length direction of the pipe body. The tubing head cross cable sheath is arranged on a step in the tubing head cross in a vertical direction, and the tubing head cross cable sheath comprises a cylinder through which the electric pump pipe column and the cable pass, and an opening is formed in the side of the cylinder and penetrates the cylinder along the length direction of the cylinder. The inner walls of the pipe body and the cylinder are provided with rubber pads, the pipe body is in contact with the cable through the rubber pad on the inner side of the pipe body, and the cylinder is in contact with the electric pump pipe column and the cable through the rubber pad on the inner side of the cylinder.

2. An electrical pump well into well cable protection device as claimed in claim 1, characterised in that, The side of the roller and / or the guide surface of the guide structure are also provided with rubber pads and abut against the outer side of the cable through the rubber pads.

3. An electrical pump well into well cable protection device as claimed in claim 1, characterised in that, The sliding frame is also provided with a return spring, one end of the return spring is connected with the sliding frame, and the other end of the return spring is connected with the sliding seat, and the return spring is always in a compressed / stretched state in the sliding process of the sliding seat.

4. An electrical pump well into well cable protection device as claimed in claim 1, characterized in that, The driving assembly is a pneumatic cylinder, a hydraulic cylinder or an electric cylinder.

5. An electrical pumping well into well cable protection device as claimed in claim 4, characterised in that, The driving assembly is a hydraulic cylinder, and the hydraulic cylinder is communicated with a low-pressure hydraulic source of the drilling and workover site.

6. An electrical pumping well into well cable protection device as claimed in claim 1, characterized in that, For the inner and outer bench operation cable sheath, the side of the pipe body is provided with a anti-dropping structure for preventing the cable from sliding out of the notch of the pipe body, the anti-dropping structure comprises a detachable clamp and a rope bound to the side of the pipe body.

7. An electrical pump well into well cable protection device as claimed in claim 1, characterized in that, For the tubing head cross cable sheath, the inner diameter of the rubber pad on the inner side of the cylinder is greater than the maximum diameter of the horizontal projection of the electric pump pipe column and a special clamp.

8. An electrical pump well into well cable protection device as claimed in claim 1, characterized in that, For the tubing head cross cable sheath, the rubber pad on the inner side of the cylinder extends upwards to protrude from the top end of the cylinder.

9. An electrical pump well into well cable protection device as claimed in claim 1, characterized in that, The tubing head cross cable sheath is configured such that when the electric pump pipe column is lifted, the gravity of the tubing head cross cable sheath is greater than the friction force between the electric pump pipe column and the tubing head cross cable sheath.

10. An electrical pumping well into well cable protection device as claimed in claim 1, characterized in that, The top of the guide structure is provided with a lifting ring.

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