CN118622198A - A visual combined salvaging machine and method for drilling tools in coal mines - Google Patents

Abstract

The present invention discloses a visual combined salvage machine and method for underground drilling tools in coal mines, the salvage machine comprises a guide shoe, a first salvage pipe body and slips, a second salvage pipe body and slips, a mounting pipe, a diversion valve seat, a camera, a pressurized piston, a solenoid valve, a transmission cable, etc. The device of the present invention uses a two-stage salvage pipe to increase the salvage range for drilling tool salvage, and a reliable pre-tightening force can be applied through the axial action of the hydraulic piston to ensure effective clamping of the drilling tool; the camera can visually observe whether the drilling tool dropped in the hole enters the salvage tube and is salvaged, avoiding blindness in the salvage work, and avoiding repeated drilling and drilling processing to waste manpower and time, which greatly increases the possibility of successful salvage.

Description

A visual combined salvaging machine and method for drilling tools in coal mines

Technical Field

The invention belongs to the technical field of drilling tool salvage in coal mines, and relates to a combined visual salvage machine and a salvage method for dropped drills and broken drill tools in coal mines.

Background Art

At present, in underground drilling construction of coal mines, especially in the process of directional drilling, due to the complex geological conditions or the fatigue and wear of the drill tools, the drill tools may break during drilling. In order to reduce the loss, male cones, female cones and salvage barrels are often used for salvage. Among them, the male cone is often misaligned or misaligned; the female cone is difficult to tap for non-magnetic drill tools or drill tools with high hardness. When the feed force is fully increased, the female cone will also cause the female cone to swell and crack, and even metal fragments will be generated to affect the subsequent processing; when the screw or slip salvage barrel is used for salvage, it is necessary to judge whether the drill tool has entered the salvage barrel based on experience, and it is impossible to intuitively judge whether the drill tool has entered and salvaged in the hole; after the dropped drill tool enters the salvage barrel, if the slip pre-tightening force is insufficient, it is easy to disengage when pulling out, and it is also possible that the overall diameter of the drill tool will be reduced due to the wear of the dropped drill tool itself, and it will be less than the minimum salvage range of the salvage barrel design, resulting in failure to salvage successfully.

Summary of the invention

In view of the deficiencies in the prior art, the purpose of the present invention is to provide a visual combined salvaging machine and method for underground drilling tools in coal mines. The combined salvaging drilling tools are used to increase the salvage range, and a reliable pre-tightening force is constructed through hydraulic action. It is possible to visually observe whether the drilling tools dropped in the hole enter the salvage tube and are salvaged, thereby avoiding blindness in the salvage work, and avoiding repeated drilling and lowering processes that waste manpower and time, thereby greatly improving the possibility of successful salvage.

In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

A visual combined salvaging machine for underground drilling tools in a coal mine, comprising a guide shoe, a first salvaging pipe body, a second salvaging pipe body, a mounting pipe, a joint, a drill rod and a special water feeder connected in sequence; a guide valve seat with a central through hole is arranged in the mounting pipe, a pressurizing component is arranged outside the guide valve seat, and a solenoid valve is arranged above the guide valve seat;

The first salvage tube body and the second salvage tube body are both provided with axial tapered internal thread grooves, and the two tube bodies are respectively provided with first slips and second slips, and the first slips and the second slips are both provided with external spiral steps and can be respectively screwed in clockwise along the tapered internal thread grooves of the first salvage tube body and the second salvage tube body, and under the axial force, the first slips and the second slips respectively move axially along the first salvage tube body and the second salvage tube body and are constrained by the tapered surface until the first slips and the second slips are gradually tightened radially; the axial force is transmitted between the first slip and the second slip through a conductive connection ring, and the axial force is transmitted between the second slip and the pressurizing assembly above it through a thrust transmission ring;

A video camera is installed at the lower end of the guide valve seat, and the upper end cooperates with the electromagnetic valve. The upper end of the electromagnetic valve is connected to the transmission cable and the signal connecting line. The signal connecting line is connected to the video transmission cable connected to the video camera. The transmission cable is connected to the orifice cable through the joint and the central channel of the drill pipe.

The present invention also includes the following technical features:

Specifically, the guide valve seat is fixed in the mounting tube by a fixing sleeve, the fixing sleeve is provided with an axial flow channel, and the pressurizing assembly is located below the fixing sleeve. The pressurizing assembly includes a pressurizing piston, a spring and a pressurizing ring arranged in sequence from top to bottom, and the pressurizing ring contacts the upper end surface of the second cava through a thrust conduction ring.

Specifically, a flow channel is processed on the circumferential surface of the lower part of the guide valve seat; the upper port of the guide valve seat cooperates with the valve body of the solenoid valve, and when the valve body moves downward to close the central flow channel of the guide valve seat, the pressure fluid cannot pass along the central flow channel, and then passes through the flow channel of the fixed sleeve to push the pressurizing piston to move axially, and through the action of the pressurizing ring and the thrust transmission ring, the second slip is pushed to move axially, and under the constraint of the tapered internal thread groove in the second salvage pipe body, the second slip contracts radially to generate a radial clamping force, which clamps the drilling tool to be salvaged; at the same time, under the action of the conductive connecting ring, the second slip pushes the first slip to move axially, generating a radial clamping force, thereby realizing the dual role of the first salvage pipe body and the second salvage pipe body.

Specifically, the solenoid valve is fixedly mounted in the mounting tube, and the upper end of the solenoid valve is respectively connected to the transmission cable and the signal connection line through the solenoid valve connector; the solenoid valve is powered by the transmission cable, the solenoid valve works when powered, and is disconnected when powered off; the valve stem of the solenoid valve is connected to the valve body, and when the solenoid valve works, the valve body is pushed toward the guide valve seat, and the flow channel is blocked; when the solenoid valve is disconnected, the valve body is away from the guide valve seat, and the flow channel is connected.

Specifically, the drill pipe threaded connection is a special water supply device, and a flow channel and a transmission cable channel are provided inside the special water supply device. The special water supply device is connected to a high-pressure water pipe through a threaded connection to realize water supply, and is connected to an orifice cable through a plug-in connector to realize video signal transmission and power supply of the solenoid valve.

Specifically, the guide shoe is threadedly connected to the first salvage pipe body and is a cylindrical structure, which guides the drilling tool in the hole into the salvage pipe body connected thereto;

The first salvage pipe body and the second salvage pipe body are both cylindrical structures, and the two are threadedly connected;

One end of the installation pipe is connected with the second salvage pipe body through a thread, and the other end is connected with the joint through a thread.

Specifically, a first positioning sleeve is provided in the annular gap between the inner wall of the lower end of the first salvage tube body and the outer wall of the lower end of the first slip, a raised step is provided in the circumferential direction at the end of the first slip that contacts the first positioning sleeve, and the first positioning sleeve cooperates with the first slip for axial positioning; a second positioning sleeve is provided in the annular gap between the inner wall of the lower end of the second salvage tube body and the outer wall of the lower end of the second slip.

Specifically, spiral friction surfaces are arranged inside the first cava and the second cava to increase the clamping force under the action of radial force; the first cava and the second cava are both provided with axial slits, and the first cava and the second cava radially shrink and deform under the action of radial force; the shrinkage deformation diameter of the second cava is smaller than that of the first cava; a circular hole is processed at the end of the axial slit to eliminate local stress concentration.

A method for visually salvaging a drilling tool in a coal mine, based on the visual combined salvaging machine for drilling tools in a coal mine, comprises the following steps:

Step 1: Lower the drilling tool: Connect the salvage tool, the first slip and the second slip are respectively located at the maximum diameter of the first salvage pipe body and the second salvage pipe body, and the first slip and the second slip are in a relaxed state; Connect the transmission cable, connect the drill pipes one by one and lower them into the hole, and punch holes with water at intervals. When the transmission cable is insufficient, connect the next one and insert it into the drill pipe;

Step 2: Rotational introduction: After lowering the drill bit into the hole to the predetermined salvage position, connect the hole mouth instrument, turn on the camera, observe the drill bit at the bottom of the hole, and slowly rotate the drill bit and feed it slowly. Use the guide shoe to gradually guide the drill bit to be salvaged into the salvage pipe body;

Step 3, clamping the drill tool: after confirming that the drill tool has entered the salvage device through the video camera, continue to slowly push the drill pipe forward, and push the drill tool to be salvaged into the first salvage pipe body according to the actual situation by observing the pushing pressure and the camera. If it can be pushed further, push it to an appropriate position in the second salvage pipe body; power the solenoid valve through the orifice transmission cable, close the central flow channel, start the pump to deliver water, and push the first slip and the second slip axially through the movement of the piston to clamp the drill tool;

Step 4: Lift the drill and observe: After clamping the drill, slowly lift the drill and observe through the camera whether the drill is detached from the salvaged tool. If not, continue to lift the drill and observe continuously. If detached, repeat step 3 and push the drill to the appropriate position.

Step 5: Disassemble the drilling tools: After all the drill rods are withdrawn from the hole, apply axial force to push the drilling tools forward. The slips move axially along the salvage tube and loosen. Remove the guide shoe and positioning sleeve in turn, release the drilling tools, and complete the salvage work.

Compared with the prior art, the present invention has the following technical effects:

1. The salvage mechanism of the present invention is designed as a two-stage salvage structure, using two different sizes of slips, which increases the diameter range of the salvage drill tool, increases the adaptability of the salvage tool, and improves the success rate.

2. The camera mechanism of the present invention can observe whether the drilling tool has successfully entered the overshot tube, and confirm whether the drilling tool has been successfully aligned and whether the drilling tool has been successfully lifted out when the drill is lifted, and whether it has not fallen off, so as to accurately understand the drilling tool status at any time and avoid the blindness and uncertainty of the previous operation method.

3. The present invention can achieve the clamping of the slips by applying axial thrust through hydraulic action, thus avoiding the previous situation where the slips cannot be clamped or tightened due to insufficient pre-tightening force. It is more reliable and greatly improves the success rate of salvage.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of the structure of a visualized combined salvaging machine for underground drilling tools in a coal mine.

The meaning of each number in the figure is:

1. Guide shoe, 2. First positioning sleeve, 3. First salvage pipe body, 4. First slip, 5. Conductive connecting ring, 6. Second positioning sleeve, 7. Second salvage pipe body, 8. Second slip, 9. Thrust conduction ring, 10. Pressurization ring, 11. Spring, 12. Pressurization piston, 13. Diversion valve seat, 14. Mounting pipe, 15. Solenoid valve, 16. Fixing sleeve, 17. Connector, 18. Transmission cable, 19. Drill pipe, 20. Special water feeder, 21. Orifice cable, 22. High-pressure water pipe, 23. Solenoid valve connector, 24. Signal connecting line, 25. Valve stem, 26. Valve body, 27. Support ring, 28. Flow channel, 29. Camera, 30. Friction surface, 31. Axial slit, 32. External spiral step, 33. Conical internal thread groove, 34. Round hole.

DETAILED DESCRIPTION

The invention provides a visual combined salvaging machine and method for underground drilling tools in coal mines. The device is used to increase the salvageable range, apply a reliable pre-tightening force, visually observe whether the drilling tools are salvaged, avoid blindness, and greatly improve the success rate.

Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

Embodiment 1:

As shown in Figure 1, this embodiment provides a visual combined salvage machine for underground drilling tools in a coal mine, including a guide shoe 1, a first salvage pipe body 3, a second salvage pipe body 7, a mounting pipe 14, a joint 17, a drill rod 19 and a special water supply device 20 connected in sequence; a guide valve seat 13 with a central through hole is provided in the mounting pipe 14, a pressurizing component is provided on the outside of the guide valve seat 13, and a solenoid valve 15 is provided above the guide valve seat 13.

The first salvage pipe body 3 and the second salvage pipe body 7 are both provided with axial conical internal thread grooves 33, and the two pipe bodies are respectively provided with first slips 4 and second slips 8. The first slips 4 and second slips 8 are both provided with external spiral steps 32 and can be respectively screwed in clockwise along the conical internal thread grooves 33 of the first salvage pipe body 3 and the second salvage pipe body 7, and under the axial force, the first slips 4 and second slips 8 respectively move axially along the first salvage pipe body 3 and the second salvage pipe body 7 and are constrained by the conical surface until the first slips 4 and second slips 8 are gradually tightened radially; the axial force is transmitted between the first slip 4 and the second slip 8 through the conductive connecting ring 5, and the axial force is transmitted between the second slip 8 and the pressurizing component above it through the thrust transmission ring 9.

A video camera 29 is installed at the lower end of the diverter valve seat 13, and the upper end cooperates with the solenoid valve 15. The upper end of the solenoid valve 15 is connected to the transmission cable 18 and the signal connection line 24. The signal connection line 24 is connected to the video transmission cable connected to the video camera 29. The transmission cable 18 is connected to the orifice cable 21 through the joint 17 and the central channel of the drill pipe 19.

The guide valve seat 13 is fixed in the mounting tube 14 by a support ring 27. The support ring 27 is provided with an axial flow passage. Below the support ring 27 is a pressurizing assembly. The pressurizing assembly includes a pressurizing piston 12, a spring 11 and a pressurizing ring 10 arranged in sequence from top to bottom. The pressurizing ring 10 contacts the upper end surface of the second slip 8 through a thrust conduction ring 9.

A flow channel 28 is processed on the lower circumferential surface of the guide valve seat 13; the upper port of the guide valve seat 13 cooperates with the valve body 26 of the solenoid valve 15. When the valve body 26 moves downward to close the central flow channel of the guide valve seat 13, the pressure fluid cannot pass along the central flow channel, and then passes through the axial flow channel of the support ring 27 to push the pressurizing piston 12 to move axially. Through the action of the pressurizing ring 10 and the thrust transmission ring 9, the second slip 8 is pushed to move axially. Under the constraint of the tapered internal thread groove 33 in the second salvage pipe body 7, the second slip 8 contracts radially to generate a radial clamping force, which clamps the drilling tool to be salvaged; at the same time, under the action of the conductive connecting ring 5, the second slip 8 pushes the first slip 4 to move axially to generate a radial clamping force, thereby realizing the dual role of the first salvage pipe body 3 and the second salvage pipe body 7.

The solenoid valve 15 is arranged in the installation pipe 14 through the fixing sleeve 16, and the upper end of the solenoid valve 15 is respectively connected to the transmission cable 18 and the signal connection line 24 through the solenoid valve connector 23; the transmission cable 18 is located in the drill rod 19, connected by a joint every several tens of meters, and installed in sections after passing through the drill rod 19. The solenoid valve 15 is powered by the transmission cable 18, and the solenoid valve 15 works when powered, and is disconnected when powered off; the valve stem 25 of the solenoid valve 15 is connected to the valve body 26, and when the solenoid valve 15 works, the valve body 26 is pushed toward the guide valve seat 13, and the central flow passage of the guide valve seat 13 is blocked; when the solenoid valve 15 is disconnected, the valve body 26 is away from the guide valve seat 13, and the central flow passage is connected.

The drill rod 19 is threadedly connected to a special water delivery device 20, and a channel and a transmission cable channel are provided inside the special water delivery device 20. The special water delivery device 20 is threadedly connected to a high-pressure water pipe 22 to realize water supply, and is connected to an orifice cable 21 through a plug-in connector to realize video signal transmission and power supply of the solenoid valve 15.

The guide shoe 1 is threadedly connected to the first salvage pipe body 3 and is a cylindrical structure, which guides the drilling tool in the hole into the salvage pipe body connected to it; the first salvage pipe body 3 and the second salvage pipe body 7 are both cylindrical structures, and the two are threadedly connected; one end of the installation pipe 14 is threadedly connected to the second salvage pipe body 7, and the other end is connected to the joint 17 through a thread.

A first positioning sleeve 2 is provided in the annular gap between the inner wall of the lower end of the first salvage tube body 3 and the outer wall of the lower end of the first slip 4. A raised step is circumferentially provided at the end of the first slip 4 that contacts the first positioning sleeve 2. The first positioning sleeve 2 cooperates with the first slip 4 for axial positioning; a second positioning sleeve 6 is provided in the annular gap between the inner wall of the lower end of the second salvage tube body 7 and the outer wall of the lower end of the second slip 8.

Spiral friction surfaces 30 are arranged inside the first slip 4 and the second slip 8 to increase the clamping force under the action of radial force; the first slip 4 and the second slip 8 are provided with axial slits 31, and the first slip 4 and the second slip 8 radially shrink and deform under the action of radial force; the shrinkage deformation diameter of the second slip 8 is smaller than that of the first slip 4; a circular hole 34 is processed at the end of the axial slit 31 to eliminate local stress concentration.

Embodiment 2:

This embodiment provides a method for visually salvaging a drilling tool in a coal mine. The method is based on the visual combined salvaging machine for drilling tools in a coal mine in Embodiment 1 and includes the following steps:

Step 1: Lower the drilling tool: Connect the visual salvage tool, and the installed slips are located at the maximum diameter of the salvage pipe body, and the slips are in a relaxed state; connect the transmission cable, connect the drill pipes one by one and lower them into the hole, and flush the holes with water at intervals. When the transmission cable is insufficient, connect the next one and insert it into the drill pipe;

Step 2: Rotational introduction: After lowering the drill bit into the hole to the predetermined salvage position, connect the hole mouth instrument, turn on the camera, observe the drill bit at the bottom of the hole, and slowly rotate the drill bit and feed it slowly. Use the guide shoe to gradually guide the drill bit to be salvaged into the salvage pipe body;

Step 3: Clamp the drill tool: After confirming that the drill tool has entered the salvage device through the video camera, continue to slowly push the drill pipe forward, and push the drill tool to be salvaged into the first salvage pipe body according to the actual situation by observing the pushing pressure and the camera. If it can be pushed further, push it to an appropriate position in the second salvage pipe body; power the solenoid valve through the orifice transmission cable, close the central flow channel, start the pump to deliver water, and push the slip axially through the movement of the piston to clamp the drill tool;

Step 4: Lift the drill and observe: After clamping the drill, slowly lift the drill and observe through the camera whether the drill is detached from the salvaged tool. If not, continue to lift the drill and observe continuously. If detached, repeat step 3 and push the drill to the appropriate position.

Step 5: Disassemble the drilling tools: After all the drill rods are withdrawn from the hole, apply axial force to push the drilling tools forward. The slips move axially along the overshot tube and loosen. Remove the guide shoe and positioning sleeve in turn, release the drilling tools, and complete the salvage work.

Claims (9)

1. A visual combined salvaging machine for underground drilling tools in a coal mine, characterized in that it comprises a guide shoe (1), a first salvaging pipe body (3), a second salvaging pipe body (7), a mounting pipe (14), a joint (17), a drill rod (19) and a special water feeder (20) which are connected in sequence; a guide valve seat (13) with a central through hole is arranged in the mounting pipe (14), a pressurizing component is arranged outside the guide valve seat (13), and a solenoid valve (15) is arranged above the guide valve seat (13); The first salvage pipe body (3) and the second salvage pipe body (7) are both provided with an axial tapered internal thread groove (33), and the two pipe bodies are respectively provided with a first slip (4) and a second slip (8), and the first slip (4) and the second slip (8) are both provided with an external spiral step (32) and can be screwed in clockwise along the tapered internal thread groove (33) of the first salvage pipe body (3) and the second salvage pipe body (7), respectively. Under the axial force, the first slip (4) and the second slip (8) move axially along the first salvage pipe body (3) and the second salvage pipe body (7), respectively, and are constrained by the tapered surface until the first slip (4) and the second slip (8) are gradually tightened radially; the axial force is transmitted between the first slip (4) and the second slip (8) through the conductive connection ring (5), and the axial force is transmitted between the second slip (8) and the pressurizing component above it through the thrust transmission ring (9); A video camera (29) is installed at the lower end of the diversion valve seat (13), and the upper end cooperates with the electromagnetic valve (15). The upper end of the electromagnetic valve (15) is connected to the transmission cable (18) and the signal connection line (24). The signal connection line (24) is connected to the video transmission cable connected to the video camera (29). The transmission cable (18) is connected to the orifice cable (21) via the joint (17) and the central channel of the drill pipe (19). 2. The visual combined salvaging machine for underground drilling tools in coal mines as described in claim 1 is characterized in that the guide valve seat (13) is fixed in the mounting tube (14) by a support ring (27), the support ring (27) is provided with an axial flow passage, and the pressure component is located below the support ring (27), and the pressure component includes a pressure piston (12), a spring (11) and a pressure ring (10) arranged in sequence from top to bottom, and the pressure ring (10) contacts the upper end surface of the second slip (8) through a thrust conduction ring (9). 3. The visual combined salvaging tool for underground drilling tools in a coal mine as described in claim 2 is characterized in that a flow channel (28) is processed on the lower circumferential surface of the diverter valve seat (13); the upper port of the diverter valve seat (13) cooperates with the valve body (26) of the solenoid valve (15), and when the valve body (26) moves downward to close the central flow channel of the diverter valve seat (13), the pressure fluid cannot pass along the central flow channel, and then passes through the axial flow channel of the support ring (27), pushing the pressurizing piston (12) to move axially, through Under the action of the pressure ring (10) and the thrust transmission ring (9), the second slip (8) is pushed to move axially. Under the restraining action of the conical internal thread groove (33) inside the second salvage pipe body (7), the second slip (8) contracts radially to generate a radial clamping force, thereby clamping the drilling tool to be salvaged. At the same time, under the action of the transmission connection ring (5), the second slip (8) pushes the first slip (4) to move axially to generate a radial clamping force, thereby realizing the dual action of the first salvage pipe body (3) and the second salvage pipe body (7). 4. The visual combined salvaging machine for underground drilling tools in a coal mine as described in claim 1 is characterized in that the solenoid valve (15) is arranged in the mounting tube (14) through a fixing sleeve (16), and the upper end of the solenoid valve (15) is respectively connected to the transmission cable (18) and the signal connection line (24) through a solenoid valve connector (23); the solenoid valve (15) is powered by the transmission cable (18), the solenoid valve (15) works when powered, and the solenoid valve (15) is disconnected when powered off; the valve stem (25) of the solenoid valve (15) is connected to the valve body (26), and when the solenoid valve (15) works, the valve body (26) is pushed toward the guide valve seat (13), and the central flow passage of the guide valve seat (13) is blocked; when the solenoid valve (15) is disconnected, the valve body (26) is away from the guide valve seat (13), and the central flow passage is connected. 5. The visual combined salvage equipment for underground drilling tools in coal mines as described in claim 1 is characterized in that the drill rod (19) is threadedly connected to a special water supply device (20), a channel and a transmission cable channel are provided inside the special water supply device (20), the special water supply device (20) is threadedly connected to a high-pressure water pipe (22) to realize water supply, and is connected to an orifice cable (21) through a plug-in connector to realize video signal transmission and power supply to the solenoid valve (15). 6. The visual combined salvaging machine for underground drilling tools in coal mines according to claim 1, characterized in that the guide shoe (1) is threadedly connected to the first salvage tube (3) and is a cylindrical structure, which guides the drilling tool in the hole into the salvage tube connected thereto; The first salvage pipe body (3) and the second salvage pipe body (7) are both cylindrical structures, and the two are threadedly connected; One end of the installation pipe (14) is threadedly connected to the second salvaging pipe body (7), and the other end is threadedly connected to the joint (17). 7. The visual combined salvaging machine for underground drilling tools in a coal mine as described in claim 1 is characterized in that a first positioning sleeve (2) is provided in the annular gap between the inner wall of the lower end of the first salvage tube body (3) and the outer wall of the lower end of the first slip (4), and a raised step is provided along the circumferential direction at the end of the first slip (4) that contacts the first positioning sleeve (2), and the first positioning sleeve (2) cooperates with the first slip (4) for axial positioning; a second positioning sleeve (6) is provided in the annular gap between the inner wall of the lower end of the second salvage tube body (7) and the outer wall of the lower end of the second slip (8). 8. The visual combined salvaging machine for underground drilling tools in coal mines as described in claim 1 is characterized in that spiral friction surfaces (30) are arranged inside the first slip (4) and the second slip (8) to increase the clamping force under the action of radial force; the first slip (4) and the second slip (8) are both provided with axial slits (31), and the first slip (4) and the second slip (8) radially shrink and deform under the action of radial force; the shrinkage deformation diameter of the second slip (8) is smaller than that of the first slip (4); a circular hole (34) is processed at the end of the axial slit (31) to eliminate local stress concentration. 9. A method for visualizing the salvaging of underground drilling tools in a coal mine, characterized in that the method is based on the visual combined salvaging machine for underground drilling tools in a coal mine according to claim 1, and comprises the following steps: Step 1: Lower the drilling tool: Connect the salvage tool, the first slip and the second slip are respectively located at the maximum diameter of the first salvage pipe body and the second salvage pipe body, and the first slip and the second slip are in a relaxed state; Connect the transmission cable, connect the drill pipes one by one and lower them into the hole, and punch holes with water at intervals. When the transmission cable is insufficient, connect the next one and insert it into the drill pipe; Step 2: Rotational introduction: After lowering the drill bit into the hole to the predetermined salvage position, connect the hole mouth instrument, turn on the camera, observe the drill bit at the bottom of the hole, and slowly rotate the drill bit and feed it slowly. Use the guide shoe to gradually guide the drill bit to be salvaged into the salvage pipe body; Step 3, clamping the drill tool: after confirming that the drill tool has entered the salvage device through the video camera, continue to slowly push the drill pipe forward, and push the drill tool to be salvaged into the first salvage pipe body according to the actual situation by observing the pushing pressure and the camera. If it can be pushed further, push it to an appropriate position in the second salvage pipe body; power the solenoid valve through the orifice transmission cable, close the central flow channel, start the pump to deliver water, and push the first slip and the second slip axially through the movement of the piston to clamp the drill tool; Step 4: Lift the drill and observe: After clamping the drill, slowly lift the drill and observe through the camera whether the drill is detached from the salvaged tool. If not, continue to lift the drill and observe continuously. If detached, repeat step 3 and push the drill to the appropriate position. Step 5: Disassemble the drilling tools: After all the drill rods are withdrawn from the hole, apply axial force to push the drilling tools forward. The slips move axially along the salvage tube and loosen. Remove the guide shoe and positioning sleeve in turn, release the drilling tools, and complete the salvage work.