A cable hanger with a function of cutting off downhole cable and a working method thereof

Abstract

The application discloses a cable suspension device with a function of cutting off underground cables and a working method thereof, and relates to the technical field of shale gas exploitation from a well hole. An upper through hole B and a sink groove are sequentially arranged in a valve body and above a cavity. The sink groove is connected with an inner hole of a conversion joint. A suspension assembly for suspending a cable is arranged on the left and right sides of the sink groove. A horizontal groove is arranged in the valve body and on the left and right sides of the upper through hole B. The two horizontal grooves are connected with the upper through hole B. A cut-off oil cylinder is arranged at the outer end of the two horizontal grooves. The piston rod of the cut-off oil cylinder is inserted into the horizontal groove, and a cutter matched with the horizontal groove is fixed on the extension end of the piston rod. The application has the advantages of greatly improving the suspension efficiency of the cable and greatly improving the fishing efficiency of the cable body.

Description

Technical Field

[0001] This invention relates to the technical field of shale gas extraction from wells, and in particular to a cable suspension device with the function of cutting downhole cables and its working method. Background Technology

[0002] The wellhead device is installed at the top of the wellhead of the gas well. A hanger is also installed at the top of the wellhead device. The hanger is used to fix the cable and cut off the natural gas flowing back from the gas well. The cable runs downward through the wellhead device and extends into the gas well to connect with various detection sensors inside the gas well, thereby transmitting data to the surface.

[0003] The structure of existing suspension devices is as follows: Figure 1 As shown, it includes a valve body 1 and a conversion connector 2 fixed to the top of the valve body 1. A cavity 3 is opened inside the valve body 1, penetrating its right side wall. An upper through hole A4 and a lower through hole A5 are opened inside the valve body 1, located above and below the cavity 3 respectively. A valve seat 6 located inside the cavity 3 is fixed at the bottom port of the upper through hole A4 and the top port of the lower through hole A5. Among them, a main oil cylinder 7 is fixed on the right side wall of the valve body 1, which is opposite to the cavity 3. The piston rod of the main oil cylinder 7 extends into the cavity 3, and a valve plate 8 is fixed on the extended end, which is slidably installed between the two valve seats 6. The center hole 9 of the valve plate 8 is connected to the inner hole of the two valve seats 6. Among them, a transverse groove is provided in the valve body 1 on both the left and right sides of the upper through hole A4. Both transverse grooves are connected to the upper through hole A4. A cutting cylinder 10 is provided at the outer port of each of the two transverse grooves. The piston rod of the cutting cylinder 10 extends into the transverse groove, and a cutter 11 that cooperates with the transverse groove is fixedly connected to the extended end. Among them, multiple long screws 12 are threadedly connected to the left and right side walls of the valve body 1 along its height direction, and each long screw 12 extends into the upper through hole A4.

[0004] The working method of this hanger is as follows: T1. The worker fixes the bottom of the hanger to the top surface of the wellhead device. At this time, the lower through hole A5 of the hanger is connected to the wellhead device. T2, the worker takes out a... Figure 2 The cable shown includes a conductive post 13 and a cable body 14 fixed to the bottom of the conductive post 13; the worker has machined multiple blind holes 15 in the left and right side walls of the conductive post 13 along its height direction. T3. Suspend the cable. The specific operating steps are as follows: T31. Pass the cable body 14 downwards sequentially through the inner hole of the adapter 2, the upper through hole A4, the inner hole of the valve seat 6, the center hole 9 of the valve plate 8, the lower through hole A5, and the wellhead device, and finally lower the cable body 14 into the wellhead; when the worker observes that the blind hole 15 in the conductive post 13 of the cable is opposite to the long screw 12, such as Figure 3 As shown, the worker holds the top of the conductive post 13 with his hand to keep the conductive post 13 stationary; T32. The worker tightens the long screws 12 located on the left and right sides of the valve body 1, and the end of the long screw 12 extends into the blind hole 15 of the conductive post 13; when the worker can no longer tighten the long screws 12, the conductive post 13 is pressed and fixed between the long screws 12 on the left and right sides, thus finally suspending the cable. Figure 4 As shown, at this time, the connection between the conductive post 13 of the cable and the cable body 14 is just between the two cutters 11. T4. When gas extraction is carried out, the shale gas in the wellbore passes sequentially through the wellhead device, the lower through hole A5, the center hole 9 of the valve plate 8, the inner hole of the valve seat 6, the upper through hole A4, the inner hole of the conversion joint 2, and finally enters the next processing equipment through the pipeline. T5. When workers discover a leak in the wellhead equipment, it is necessary to stop the shale gas from continuing to flow upwards. The specific steps for stopping the leak are as follows: T51, control the piston rods of the two cutting cylinders 10 to extend simultaneously, and the piston rods drive the cutter 11 to move toward the connection between the conductive post 13 and the cable body 14; When the piston rods of the two cutting cylinders 10 are fully extended, the two cutters 11 sever the connection between the conductive post 13 and the cable body 14, as shown. Figure 5 As shown, at this point, the cable body 14 falls to the bottom of the wellbore under its own weight. [If the top connection between the conductive post 13 and the cable body 14 is not cut off here, the cable body 14 will obstruct the subsequent movement of the valve plate 8]. The falling direction of the cable body 14 is as follows: Figure 5 As indicated by the middle arrow; then the piston rod of the cutting cylinder 10 is retracted to reset the cutter 11; T52. Control the piston rod of the main hydraulic cylinder 7 to retract to the right. The piston rod drives the valve plate 8 to move to the right relative to the stationary valve seat 6. When the piston rod of the main hydraulic cylinder 7 is fully retracted, the center hole 9 of the valve plate 8 is just offset from the valve seat 6. Figure 6 As shown, this stops the shale gas from flowing upwards, allowing workers to repair any leaks in the wellhead equipment. T6. After the worker has repaired the wellhead equipment, the worker holds the top of the conductive post 13, then loosens the long screw 12 to separate it from the conductive post 13, and then lifts the conductive post 13 to remove it. Figure 7As shown; after the conductive column 13 is removed, the workers then use a retrieval tool to retrieve the cable body 14 that has fallen to the bottom of the wellbore. T7. Repeat steps T1 to T3 to re-suspend the other cable.

[0005] However, while existing hangers can still be used for gas production in wells, they still have the following technical shortcomings in practical applications: I. In step T3, workers need to tighten multiple long screws 12 located on the left and right sides of the valve body 1 to press and fix the conductive post 13 between the long screws 12 on the left and right sides, so that the cable can be suspended. However, there are as many as 6 long screws 12 to be tightened, which takes a long time to suspend the cable, which undoubtedly reduces the efficiency of suspending the cable.

[0006] II. In step T5, after the cutter 11 cuts the connection between the conductive post 13 and the cable body 14, the cable body 14 falls to the bottom of the well. This results in a long distance to retrieve the cable body 14. Therefore, in step T6, the worker needs to spend a long time to retrieve the cable body 14 from the bottom of the well, thereby reducing the retrieval efficiency of the cable body 14.

[0007] Therefore, there is an urgent need for a suspension device and its working method that can greatly improve the efficiency of cable suspension and cable retrieval. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide a cable suspension device with the function of cutting downhole cables and its working method.

[0009] The objective of this invention is achieved through the following technical solution: a cable suspension device with the function of cutting downhole cables, comprising a valve body and a conversion joint fixed to the top of the valve body. A cavity penetrating the right side wall of the valve body is provided inside the valve body. An upper through hole B and a sink are sequentially provided inside the valve body and above the cavity. The sink is connected to the inner hole of the conversion joint. A suspension component for suspending cables is provided on both the left and right sides of the sink. The valve body is provided with a lower through hole B and a rectangular cavity in sequence below the cavity. A cable body dragging component for dragging the cable downward is provided on both the left and right sides of the rectangular cavity. A valve seat is fixed at the bottom port of the upper through hole B and the top port of the lower through hole B in the valve body. A main oil cylinder is fixed on the right side wall of the valve body, which is opposite to the left and right of the cavity. The piston rod of the main oil cylinder extends into the cavity, and a valve plate is fixed on the extended end, which is slidably installed between the two valve seats. The center hole of the valve plate is connected to the inner hole of the two valve seats. A transverse groove is provided on both the left and right sides of the upper through hole B inside the valve body. Both transverse grooves are connected to the upper through hole B. A cutting cylinder is provided at the outer port of each transverse groove. The piston rod of the cutting cylinder extends into the transverse groove, and a cutter that cooperates with the transverse groove is fixedly connected to the extended end.

[0010] The inner hole of the conversion connector, the upper through hole B, the lower through hole B, and the rectangular cavity in the valve body are all on the same vertical line.

[0011] The diameter of the central hole of the valve plate is equal to the diameter of the inner hole of the valve seat.

[0012] The suspension assembly located on the right side includes a vertical cylinder fixed to the base plate of the conversion joint and a guide rod that horizontally penetrates the right side wall of the settling tank. The piston rod of the vertical cylinder extends downward into the settling tank, and a connecting block is fixed on the extended end. A connecting rod is hinged between the connecting block and the guide rod. A clamping block is fixed on the left end face of the guide rod.

[0013] The two suspension components are arranged symmetrically on the left and right.

[0014] The dragging assembly located on the left side includes a hydraulic motor and a clamping cylinder fixed to the left outer wall of the valve body. The piston rod of the clamping cylinder extends into a rectangular cavity and a vertical plate is fixed to the extended end. A vertical guide rail is fixed on the right end face of the vertical plate, and a vertical slider is slidably installed on the vertical guide rail. The rotating shaft of the hydraulic motor extends into a rectangular cavity and a swing arm is fixedly connected to the extended end. A pin is fixedly connected to the upper end of the swing arm. A long rod extending downward is rotatably mounted on the pin. A horizontal plate is hinged to the bottom end of the long rod via a hinge seat. A horizontal guide rail is fixed on the bottom surface of the horizontal plate. A horizontal slider is slidably mounted on the horizontal guide rail. An L-shaped force transmission block is provided between the horizontal slider and the vertical slider. The top edge of the L-shaped force transmission block is welded to the horizontal slider, the side edge of the L-shaped force transmission block is welded to the vertical slider, and a clamping block is fixed on the right end of the L-shaped force transmission block.

[0015] The two drag-and-drop components are set symmetrically on the left and right.

[0016] The suspension device also includes a controller, which is electrically connected to the main cylinder, vertical cylinder, cut-off cylinder and hydraulic motor via signal lines.

[0017] A method for operating a cable suspension device with a function of cutting downhole cables includes the following steps: S1. The worker fixes the bottom of the suspension device to the top surface of the wellhead device. At this time, the rectangular cavity of the suspension device is connected to the wellhead device. S2. Take out a cable, which includes a conductive post and a cable body fixed to the bottom of the conductive post. The worker welds a support block on the left and right side walls of the conductive post of the cable, and then the worker processes a rectangular groove on the outer end face of the two support blocks. S3. Suspend the cable. The specific steps are as follows: S31. Pass the cable body downwards sequentially through the inner hole of the adapter, the groove of the valve body, the upper through hole B, the inner hole of the valve seat, the center hole of the valve plate, the lower through hole B, the rectangular cavity, and the wellhead device. Finally, lower the cable body into the well. Then, support the support blocks on both sides of the conductive column on the bottom surface of the groove. Adjust the position of the support blocks so that the rectangular grooves of the two support blocks are opposite to the clamps of the two suspension components. S32. The piston rods of the vertical cylinders of the two suspension components extend downward, the piston rods drive the connecting block to move downward, the connecting block drives the connecting rod to move downward, the connecting rod drives the guide rod to move towards the support block, and the guide rod drives the clamping block to move towards the rectangular groove of the support block. When the piston rod perpendicular to the cylinder is fully extended, the two clamping blocks are inserted into the rectangular slots of the two support blocks respectively, and the conductive post is clamped and fixed, thus finally suspending the cable. At this time, the cable body is just between the two clamping blocks of the dragging assembly, and the connection between the cable's conductive post and the cable body is just between the two cutters. S4. When gas extraction is carried out, the shale gas in the wellbore passes sequentially through the wellhead device, rectangular cavity, lower through hole B, center hole of valve plate, inner hole of valve seat, upper through hole B, settling tank, inner hole of conversion joint, and finally enters the next processing equipment through pipeline. S5. When workers discover a leak in the wellhead equipment, it is necessary to stop the shale gas from continuing to flow upwards. The specific steps for stopping the leak are as follows: S51. The piston rods of the clamping cylinders of the two dragging components extend simultaneously. The piston rods drive the vertical plate and the vertical guide rail to move synchronously toward the cable body, thereby driving the L-shaped force transmission block to move relative to the stationary horizontal guide rail toward the cable body. The L-shaped force transmission block then drives the clamping block to move toward the cable body. When the piston rods of the clamping cylinders of the two dragging components are fully extended, the two clamping blocks clamp the cable body. S52. Control the piston rods of the two cutting cylinders to extend simultaneously, and the piston rods drive the cutter to move towards the connection between the conductive post and the cable body; when the piston rods of the two cutting cylinders are fully extended, the two cutters cut the connection between the conductive post and the cable body; then control the piston rods of the two cutting cylinders to retract, thereby resetting the cutter. S53. The rotating shafts of the hydraulic motors controlling the two dragging components rotate simultaneously. The rotating shafts drive the swing arm to move downward, the swing arm drives the long rod to move downward, the long rod drives the transverse plate and transverse guide rail to move downward synchronously, thereby driving the L-shaped force transmission block to move downward relative to the stationary vertical guide rail. The L-shaped force transmission block then drives the clamping block to move downward synchronously. The two clamping blocks drive the cut cable body to move downward synchronously, thereby causing the cable body to gradually move away from the valve plate. When the swing arm rotates 180 degrees, the controller controls the hydraulic motor to shut off. At this time, the cable body is just dragged below the valve plate. S54. Control the piston rod of the main cylinder to retract to the right. The piston rod drives the valve plate to move to the right relative to the stationary valve seat. When the piston rod of the main cylinder is fully retracted, the center hole of the valve plate is just offset from the valve seat, thereby blocking the shale gas from continuing to flow upward. At this time, the worker can repair the leakage of the wellhead device. S6. After the workers have repaired the wellhead equipment, the steps for removing both the conductive column and the cable body are as follows: S61. The piston rod of the vertical cylinder of the control suspension assembly retracts upward to reset the clamping blocks. At this time, the conductive column is no longer clamped and fixed by the two clamping blocks. Then the worker lifts the conductive column upward, thereby removing the conductive column. S62. Control the piston rod of the main cylinder to extend to the left, and the piston rod drives the valve plate to move to the left so that the center hole of the valve plate is connected to the inner hole of the valve seat again. S63. The worker uses a retrieval tool to clamp the top of the cable body, and then controls the piston rod of the clamping cylinder of the two dragging components to retract, so that the L-shaped force transmission block and the clamping block move away from the cable body. At this time, the two clamping blocks no longer clamp the cable body; then the worker uses the retrieval tool to lift the cable body upward, thus realizing the removal of the cable body. S7. Repeat steps S1 to S3 to re-suspend the other cable.

[0018] The present invention has the following advantages: it greatly improves the efficiency of cable suspension and the efficiency of cable retrieval. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a suspension device in the prior art; Figure 2 This is a schematic diagram of the structure of a cable in the prior art; Figure 3 This is a schematic diagram showing the blind hole and long screw facing each other on the left and right sides in the conductive post of a cable in the prior art. Figure 4 A schematic diagram of a cable suspension device using existing technology; Figure 5This is a schematic diagram of how two cutters in the prior art sever the connection between the conductive post and the cable body. Figure 6 This is a schematic diagram showing that the center hole of the valve plate in the prior art is offset from the valve seat; Figure 7 A schematic diagram showing workers removing the conductive column; Figure 8 This is a schematic diagram of the structure of the present invention; Figure 9 This is a schematic diagram of the valve body of the present invention; Figure 10 This is an isometric view of the suspension assembly of the present invention; Figure 11 for Figure 10 Main section diagram; Figure 12 This is an isometric view of the drag-and-drop component of the present invention; Figure 13 for Figure 12 P-direction schematic diagram; Figure 14 for Figure 12 Main section diagram; Figure 15 This is a schematic diagram showing the connection between the main oil cylinder and the valve plate of the present invention; Figure 16 A schematic diagram showing workers welding a support block to the left and right side walls of the conductive post of the cable. Figure 17 for Figure 16 Schematic diagram of the KK cross section; Figure 18 This is a schematic diagram showing that the support blocks located on both sides of the conductive post are supported on the bottom surface of the sink. Figure 19 This is a schematic diagram of suspending a cable. Figure 20 A schematic diagram showing two clamping blocks holding the cable body tightly. Figure 21 This is a schematic diagram showing two cutters severing the connection between the conductive post and the cable body of a cable. Figure 22 This is a schematic diagram showing the cable being dragged under the valve plate. Figure 23 This is a schematic diagram showing that the center hole of the valve plate is offset from the valve seat; Figure 24 This is a schematic diagram showing how the conductive post was removed. Figure 25 This is a schematic diagram showing the removal of the cable body; In the picture: 1-Valve body, 2-Converter, 3-Cavity, 4-Upper through hole A, 5-Lower through hole A, 6-Valve seat, 7-Main cylinder, 8-Valve plate, 9-Center hole, 10-Cut-off cylinder, 11-Cutter, 12-Long screw, 13-Conductive post, 14-Cable body, 15-Blind hole.

[0020] 16-Upper through hole B, 17-Sinking groove, 18-Suspension assembly, 19-Lower through hole B, 20-Rectangular cavity, 21-Towing assembly, 22-Vertical cylinder, 23-Guide rod, 24-Connecting rod, 25-Clamping block; 26-Hydraulic motor, 27-Clamping cylinder, 28-Vertical guide rail, 29-Vertical slider, 30-Swing arm, 31-Long rod, 32-Horizontal guide rail, 33-Horizontal slider, 34-L-shaped force transmission block, 35-Clamping block; 36-Support block, 37-Rectangular groove. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings. The scope of protection of the present invention is not limited to the following description: like Figures 8-15 As shown, a cable suspension device with the function of cutting downhole cables includes a valve body 1 and a conversion joint 2 fixed to the top of the valve body 1. A cavity 3 is opened in the valve body 1 through its right side wall. An upper through hole B16 and a sink 17 are sequentially opened in the valve body 1 and above the cavity 3. The sink 17 is connected to the inner hole of the conversion joint 2. A suspension assembly 18 for suspending cables is provided on both the left and right sides of the sink 17. The two suspension assemblies 18 are symmetrically arranged on the left and right sides.

[0022] The suspension assembly 18 located on the right side includes a vertical cylinder 22 fixed to the base plate of the conversion joint 2 and a guide rod 23 that horizontally penetrates the right side wall of the sink 17. The piston rod of the vertical cylinder 22 extends downward into the sink 17, and a connecting block is fixed on the extended end. A connecting rod 24 is hinged between the connecting block and the guide rod 23. A clamping block 25 is fixed on the left end face of the guide rod 23.

[0023] The valve body 1 is provided with a lower through hole B19 and a rectangular cavity 20 in sequence below the cavity 3. A cable dragging assembly 21 for dragging the cable is provided on both the left and right sides of the rectangular cavity 20; the two dragging assemblies 21 are arranged symmetrically on the left and right.

[0024] The dragging assembly 21 located on the left side includes a hydraulic motor 26 and a clamping cylinder 27 fixed to the left outer wall of the valve body 1. The piston rod of the clamping cylinder 27 extends into the rectangular cavity 20, and a vertical plate is fixedly connected to its extended end. A vertical guide rail 28 is fixedly provided on the right end face of the vertical plate, and a vertical slider 29 is slidably mounted on the vertical guide rail 28. The rotating shaft of the hydraulic motor 26 extends into the rectangular cavity 20, and a swing arm 30 is fixedly connected to its extended end. A pin is fixedly connected to the upper end of the swing arm 30. A long rod 31 extending downwards is mounted on the upper rotating part. The bottom end of the long rod 31 is hinged to a horizontal plate via a hinge seat. A horizontal guide rail 32 is fixed on the bottom surface of the horizontal plate. A horizontal slider 33 is slidably mounted on the horizontal guide rail 32. An L-shaped force transmission block 34 is provided between the horizontal slider 33 and the vertical slider 29. The top edge of the L-shaped force transmission block 34 is welded to the horizontal slider 33, and the side edge of the L-shaped force transmission block 34 is welded to the vertical slider 29. A clamping block 35 is fixed on the right end of the L-shaped force transmission block 34.

[0025] A valve seat 6 is fixed at the bottom port of the upper through hole B16 and the top port of the lower through hole B19 in the valve body 1. A main oil cylinder 7 is fixed on the right side wall of the valve body 1, which is opposite to the cavity 3. The piston rod of the main oil cylinder 7 extends into the cavity 3, and a valve plate 8 is fixed on the extended end, which is slidably installed between the two valve seats 6. The central hole 9 of the valve plate 8 is connected to the inner hole of the two valve seats 6. The diameter of the central hole 9 of the valve plate 8 is equal to the diameter of the inner hole of the valve seat 6.

[0026] A transverse groove is provided on both the left and right sides of the upper through hole B16 inside the valve body 1. Both transverse grooves are connected to the upper through hole B16. A cutting cylinder 10 is provided at the outer port of each of the two transverse grooves. The piston rod of the cutting cylinder 10 extends into the transverse groove, and a cutter 11 that cooperates with the transverse groove is fixedly connected to the extended end.

[0027] The inner hole of the conversion connector 2, the upper through hole B16, the lower through hole B19, and the rectangular cavity 20 in the valve body 1 are all on the same vertical line.

[0028] The suspension device also includes a controller, which is electrically connected to the main cylinder 7, the vertical cylinder 22, the cut-off cylinder 10, and the hydraulic motor 26 via signal lines.

[0029] A method for operating a cable suspension device with a function of cutting downhole cables includes the following steps: S1. The worker fixes the bottom of the suspension device to the top surface of the wellhead device. At this time, the rectangular cavity 20 of the suspension device is connected to the wellhead device. S2. Take out a cable, which includes a conductive post 13 and a cable body 14 fixed to the bottom of the conductive post 13; the worker welds a support block 36 to the left and right side walls of the conductive post 13 of the cable, such as Figures 16-17 As shown, the worker then machined a rectangular groove 37 on the outer end face of each of the two support blocks 36; S3. Suspend the cable. The specific steps are as follows: S31. Pass the cable body 14 downwards sequentially through the inner hole of the adapter 2, the groove 17 of the valve body 1, the upper through hole B16, the inner hole of the valve seat 6, the center hole 9 of the valve plate 8, the lower through hole B19, the rectangular cavity 20, and the wellhead device. Finally, lower the cable body 14 into the wellbore. Then, support blocks 36 located on both sides of the conductive post 13 are placed on the bottom surface of the groove 17. Figure 18 As shown, the position of the support block 36 is then adjusted so that the rectangular grooves 37 of the two support blocks 36 are respectively opposite to the clamping blocks 25 of the two suspension components 18. S32, the piston rods of the vertical cylinders 22 of the two suspension components 18 extend downward, the piston rods drive the connecting block to move downward, the connecting block drives the connecting rod 24 to move downward, the connecting rod 24 drives the guide rod 23 to move toward the support block 36, and the guide rod 23 drives the clamping block 25 to move toward the rectangular groove 37 of the support block 36. When the piston rod perpendicular to the hydraulic cylinder 22 is fully extended, the two clamping blocks 25 are respectively inserted into the rectangular slots 37 of the two support blocks 36, clamping and fixing the conductive post 13, thus ultimately suspending the cable. Figure 19 As shown, at this time, the cable body 14 is just between the two clamping blocks 35 of the dragging assembly 21, and at the same time, the connection between the cable conductive post 13 and the cable body 14 is just between the two cutters 11. As can be seen from steps S31 to S32, the worker only needs to first support the support blocks 36 located on both sides of the conductive post 13 on the bottom surface of the sink 17, and then adjust the position of the support blocks 36 so that the rectangular grooves 37 of the two support blocks 36 are respectively opposite to the clamping blocks 25 of the two suspension components 18; then control the piston rod of the vertical cylinder 22 of the suspension component 18 to extend downward so as to clamp and fix the conductive post 13 of the cable through the two clamping blocks 25, thereby finally suspending the cable.

[0030] Therefore, it can be seen that this suspension device is comparable to... Figures 1-7 The cable hanger shown does not require workers to tighten the multiple long screws 12 located on the left and right sides of the valve body to suspend the cable. Instead, it only requires controlling the piston rods of the vertical cylinders 22 of the two suspension components 18 to extend downwards, which can quickly and automatically suspend the cable, thereby greatly improving the cable suspension efficiency.

[0031] S4. When gas extraction is carried out, the shale gas in the wellbore passes sequentially through the wellhead device, rectangular cavity 20, lower through hole B19, center hole 9 of valve plate 8, inner hole of valve seat 6, upper through hole B16, settling tank 17, inner hole of conversion joint 2, and finally enters the next processing equipment through the pipeline. S5. When workers discover a leak in the wellhead equipment, it is necessary to stop the shale gas from continuing to flow upwards. The specific steps for stopping the leak are as follows: S51, the piston rods of the clamping cylinders 27 of the two dragging components 21 extend simultaneously. The piston rods drive the vertical plate and vertical guide rail 28 to move synchronously towards the cable body 14, thereby driving the L-shaped force transmission block 34 to move relative to the stationary horizontal guide rail 32 towards the cable body 14. The L-shaped force transmission block 34 then drives the clamping block 35 to move towards the cable body 14. When the piston rods of the clamping cylinders 27 of the two dragging components 21 are fully extended, the two clamping blocks 35 clamp the cable body 14 tightly. Figure 20 As shown; S52, control the piston rods of the two cutting cylinders 10 to extend simultaneously, the piston rods drive the cutter 11 to move towards the connection between the conductive post 13 and the cable body 14; when the piston rods of the two cutting cylinders 10 are fully extended, the two cutters 11 cut the connection between the conductive post 13 and the cable body 14, as shown. Figure 21 As shown; then the piston rods of the two cutting cylinders 10 are retracted, thereby resetting the cutter 11; S53. The rotating shafts of the hydraulic motors 26 controlling the two dragging components 21 rotate simultaneously. The rotating shafts drive the swing arm 30 to move downwards, the swing arm 30 drives the long rod 31 to move downwards, and the long rod 31 drives the transverse plate and transverse guide rail 32 to move downwards synchronously. This causes the L-shaped force transmission block 34 to move downwards relative to the stationary vertical guide rail 28. The L-shaped force transmission block 34 then drives the clamping block 35 to move downwards synchronously. The two clamping blocks 35 drive the cut cable body 14 to move downwards synchronously, thus causing the cable body 14 to gradually move away from the valve plate 8. When the swing arm 30 rotates 180 degrees, the controller controls the hydraulic motor 26 to shut off. At this time, the cable body 14 is just dragged below the valve plate 8. Figure 22 As shown; S54. The piston rod of the main hydraulic cylinder 7 retracts to the right, causing the valve plate 8 to move to the right relative to the stationary valve seat 6. When the piston rod of the main hydraulic cylinder 7 is fully retracted, the center hole 9 of the valve plate 8 is just offset from the valve seat 6. Figure 23 As shown, this stops the shale gas from flowing upwards, allowing workers to repair any leaks in the wellhead equipment. S6. After the workers have repaired the wellhead equipment, the steps for removing both the conductive column 13 and the cable body 14 are as follows: S61, the piston rod of the vertical cylinder 22 of the control suspension assembly 18 retracts upward to reset the clamping block 25. At this time, the conductive post 13 is no longer clamped and fixed by the two clamping blocks 25. Then, the worker lifts the conductive post 13 upward, thereby removing the conductive post 13. Figure 24 As shown; S62. Control the piston rod of the main cylinder 7 to extend to the left, and the piston rod drives the valve plate 8 to move to the left so that the center hole 9 of the valve plate 8 can be connected to the inner hole of the valve seat 6 again. S63. The worker uses a retrieval tool to clamp the top of the cable body 14, and then controls the piston rods of the clamping cylinders 27 of the two dragging components 21 to retract, thereby causing the L-shaped force transmission block 34 and the clamping block 35 to move away from the cable body 14. At this time, the two clamping blocks 35 no longer clamp the cable body 14. Then the worker uses the retrieval tool to lift the cable body 14 upwards, thus removing the cable body 14. The direction of removing the cable body 14 is as follows: Figure 25 As indicated by the middle arrow; S7. Repeat steps S1 to S3 to re-suspend the other cable.

[0032] In step S51, the piston rods of the clamping cylinders 27 of the two dragging components 21 are extended to clamp the cable body 14 of the cable through the two clamping blocks 35. Then, in step S52, the piston rods of the two cutting cylinders 10 are extended simultaneously to cut off the connection between the conductive post 13 and the cable body 14, so that the conductive post 13 is separated from the cable body 14. Then, in step S53, the rotating shafts of the two hydraulic motors 26 of the two dragging components 21 are rotated simultaneously to drag the cable body 14 to the bottom of the valve plate 8. Then, in step S53, the worker uses a retrieval tool to take out the cable body 14.

[0033] Therefore, since the cable body 14 was only dragged to below the valve plate 8 and did not fall directly to the bottom of the well, the distance to retrieve the cable body 14 was very short, compared to... Figures 1-7 The suspended device shown can remove the cable body 14 in a short time, thereby greatly improving the retrieval efficiency of the cable body 14.

Claims

1. A cable suspension device with the function of cutting downhole cables, comprising a valve body (1), a conversion connector (2) fixed to the top of the valve body (1), and a cavity (3) penetrating the right side wall of the valve body (1), characterized in that: The valve body (1) has an upper through hole B (16) and a groove (17) sequentially opened inside and above the cavity (3). The groove (17) is connected to the inner hole of the conversion connector (2). A suspension assembly (18) for suspending cables is provided on both the left and right sides of the groove (17). The valve body (1) is provided with a lower through hole B (19) and a rectangular cavity (20) in sequence below the cavity (3). A cable body dragging assembly (21) for dragging the cable downward is provided on both the left and right sides of the rectangular cavity (20). A valve seat (6) is fixed at the bottom port of the upper through hole B (16) and the top port of the lower through hole B (19) in the valve body (1). A main oil cylinder (7) is fixed on the right side wall of the valve body (1) and is opposite to the cavity (3). The piston rod of the main oil cylinder (7) extends into the cavity (3), and a valve plate (8) is fixed on the extended end and is slidably installed between the two valve seats (6). The center hole (9) of the valve plate (8) is connected to the inner hole of the two valve seats (6). A transverse groove is provided in the valve body (1) and on the left and right sides of the upper through hole B (16). Both transverse grooves are connected to the upper through hole B (16). A cutting cylinder (10) is provided at the outer port of each of the two transverse grooves. The piston rod of the cutting cylinder (10) extends into the transverse groove, and a cutter (11) that cooperates with the transverse groove is fixedly connected to the extended end. The dragging assembly (21) located on the left side includes a hydraulic motor (26) and a clamping cylinder (27) fixed on the left outer wall of the valve body (1). The piston rod of the clamping cylinder (27) extends into the rectangular cavity (20) and a vertical plate is fixedly connected to the extended end. A vertical guide rail (28) is fixed on the right end face of the vertical plate, and a vertical slider (29) is slidably installed on the vertical guide rail (28). The rotating shaft of the hydraulic motor (26) extends into the rectangular cavity (20) and a swing arm (30) is fixedly connected to the extended end. A pin is fixedly connected to the upper end of the swing arm (30), and a long rod (31) extending downward is rotatably mounted on the pin. A transverse plate is hinged to the bottom end of the long rod (31) via a hinge seat. A transverse guide rail (32) is fixedly provided on the bottom surface of the transverse plate, and a transverse slider (33) is slidably mounted on the transverse guide rail (32). An L-shaped force transmission block (34) is provided between the horizontal slider (33) and the vertical slider (29). The top edge of the L-shaped force transmission block (34) is welded to the horizontal slider (33), and the side edge of the L-shaped force transmission block (34) is welded to the vertical slider (29). A clamping block (35) is fixed on the right end of the L-shaped force transmission block (34).

2. A cable suspension device with the function of cutting downhole cables according to claim 1, characterized in that: The inner hole of the adapter (2), the upper through hole B (16), the lower through hole B (19), and the rectangular cavity (20) in the valve body (1) are all on the same vertical line.

3. A cable suspension device with the function of cutting downhole cables according to claim 2, characterized in that: The diameter of the central hole (9) of the valve plate (8) is equal to the diameter of the inner hole of the valve seat (6).

4. A cable suspension device with the function of cutting downhole cables according to claim 3, characterized in that: The suspension assembly (18) located on the right side includes a vertical cylinder (22) fixed on the bottom plate of the conversion joint (2) and a guide rod (23) that horizontally penetrates the right side wall of the sink trough (17). The piston rod of the vertical cylinder (22) extends downward into the sink trough (17), and a connecting block is fixed on the extended end. A connecting rod (24) is hinged between the connecting block and the guide rod (23). A clamping block (25) is fixed on the left end face of the guide rod (23).

5. A cable suspension device with the function of cutting downhole cables according to claim 4, characterized in that: The two suspension components (18) are symmetrically arranged on the left and right.

6. A cable suspension device with the function of cutting downhole cables according to claim 5, characterized in that: The two drag-and-drop components (21) are set symmetrically on the left and right.

7. A cable suspension device with the function of cutting downhole cables according to claim 6, characterized in that: The suspension device also includes a controller, which is electrically connected to the main cylinder (7), vertical cylinder (22), cut-off cylinder (10) and hydraulic motor (26) via signal lines.

8. A method for operating a cable suspension device with a function of cutting downhole cables, comprising the cable suspension device with a function of cutting downhole cables as described in claim 7, characterized in that: It includes the following steps: S1. The worker fixes the bottom of the suspension device to the top surface of the wellhead device. At this time, the rectangular cavity (20) of the suspension device is connected to the wellhead device. S2. Take out a cable, which includes a conductive post (13) and a cable body (14) fixed to the bottom of the conductive post (13). The worker welds a support block (36) on the left and right side walls of the conductive post (13) of the cable, and then the worker processes a rectangular groove (37) on the outer end face of the two support blocks (36). S3. Suspend the cable. The specific steps are as follows: S31. Pass the cable body (14) of the cable downwards through the inner hole of the adapter (2), the groove (17) of the valve body (1), the upper through hole B (16), the inner hole of the valve seat (6), the center hole (9) of the valve plate (8), the lower through hole B (19), the rectangular cavity (20), and the wellhead device in sequence. Finally, lower the cable body (14) into the well hole. Then, support the support blocks (36) on both sides of the conductive column (13) on the bottom surface of the groove (17). Then, adjust the position of the support blocks (36) so that the rectangular grooves (37) of the two support blocks (36) are respectively opposite to the clamps (25) of the two suspension components (18). S32, the piston rod of the vertical cylinder (22) of the two suspension components (18) extends downward, the piston rod drives the connecting block to move downward, the connecting block drives the connecting rod (24) to move downward, the connecting rod (24) drives the guide rod (23) to move towards the support block (36), and the guide rod (23) drives the clamping block (25) to move towards the rectangular groove (37) of the support block (36); When the piston rod perpendicular to the cylinder (22) is fully extended, the two clamping blocks (25) are inserted into the rectangular slots (37) of the two support blocks (36) respectively, and the conductive post (13) is clamped and fixed, thus finally suspending the cable. At this time, the cable body (14) is just between the two clamping blocks (35) of the dragging assembly (21), and the connection between the conductive post (13) and the cable body (14) is just between the two cutters (11). S4. When gas extraction is carried out, the shale gas in the wellbore passes through the wellhead device, rectangular cavity (20), lower through hole B (19), center hole (9) of valve plate (8), inner hole of valve seat (6), upper through hole B (16), settling tank (17), inner hole of conversion joint (2) in sequence, and finally enters the next processing equipment through the pipeline. S5. When workers discover a leak in the wellhead equipment, it is necessary to stop the shale gas from continuing to flow upwards. The specific steps for stopping the leak are as follows: S51. The piston rods of the clamping cylinders (27) of the two dragging components (21) extend simultaneously. The piston rods drive the vertical plate and the vertical guide rail (28) to move synchronously toward the cable body (14) of the cable, thereby driving the L-shaped force transmission block (34) to move relative to the stationary horizontal guide rail (32) toward the cable body (14). The L-shaped force transmission block (34) then drives the clamping block (35) to move toward the cable body (14). When the piston rods of the clamping cylinders (27) of the two dragging components (21) are fully extended, the two clamping blocks (35) clamp the cable body (14). S52. Control the piston rods of the two cutting cylinders (10) to extend simultaneously, and the piston rods drive the cutter (11) to move toward the connection between the conductive post (13) and the cable body (14); when the piston rods of the two cutting cylinders (10) are fully extended, the two cutters (11) cut off the connection between the conductive post (13) and the cable body (14); then control the piston rods of the two cutting cylinders (10) to retract, so that the cutter (11) is reset. S53. The rotating shafts of the hydraulic motors (26) controlling the two dragging components (21) rotate simultaneously. The rotating shafts drive the swing arm (30) to move downward. The swing arm (30) drives the long rod (31) to move downward. The long rod (31) drives the horizontal plate and the horizontal guide rail (32) to move downward synchronously, thereby driving the L-shaped force transmission block (34) to move downward relative to the stationary vertical guide rail (28). The L-shaped force transmission block (34) then drives the clamping block (35) to move downward synchronously. The two clamping blocks (35) drive the cut cable body (14) to move downward synchronously, thereby causing the cable body (14) to gradually move away from the valve plate (8). When the swing arm (30) rotates 180 degrees, the controller controls the hydraulic motor (26) to shut off. At this time, the cable body (14) is just dragged to the bottom of the valve plate (8). S54. Control the piston rod of the main cylinder (7) to retract to the right. The piston rod drives the valve plate (8) to move to the right relative to the stationary valve seat (6). When the piston rod of the main cylinder (7) is fully retracted, the center hole (9) of the valve plate (8) is just offset from the valve seat (6), thereby blocking the shale gas from continuing to flow upward. At this time, the worker can repair the leakage of the wellhead device. S6. After the worker has repaired the wellhead equipment, the operation steps for removing both the conductive column (13) and the cable body (14) are as follows: S61. The piston rod of the vertical cylinder (22) of the control suspension assembly (18) retracts upward to reset the clamping block (25). At this time, the conductive column (13) is no longer clamped and fixed by the two clamping blocks (25). Then the worker lifts the conductive column (13) upward, thereby realizing the removal of the conductive column (13). S62. Control the piston rod of the main cylinder (7) to extend to the left, and the piston rod drives the valve plate (8) to move to the left so that the center hole (9) of the valve plate (8) is connected to the inner hole of the valve seat (6) again. S63. The worker uses a retrieval tool to clamp the top of the cable body (14), and then controls the piston rod of the clamping cylinder (27) of the two dragging components (21) to retract, so that the L-shaped force transmission block (34) and the clamping block (35) move away from the cable body (14). At this time, the two clamping blocks (35) no longer clamp the cable body (14); then the worker uses the retrieval tool to lift the cable body (14) upward, thus realizing the removal of the cable body (14); S7. Repeat steps S1 to S3 to re-suspend the other cable.

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