Geological drilling pipe taking device and method

Abstract

The invention provides a geological drilling pipe taking device and method, and relates to the technical field of fishing tools. The structure comprises a mandrel, an outer suspension joint, an inner suspension joint and a slip structure, the mandrel is arranged in the inner suspension joint, the slip structure is arranged on the outer side wall of the mandrel in a sleeving mode, the outer suspension joint is arranged on the outer side wall of the inner suspension joint in a sleeving mode, and the outer suspension joint is detachably connected with the slip structure. A tile radial movement expanding structure used for controlling the slip structure is arranged in the mandrel, and an expanding and milling structure is arranged at the end, deviating from the inner suspension connector, of the mandrel; the expanding and milling structure and the slip structure are matched together to complete cutting and fishing of the casing pipe at a time, and therefore the casing pipe cutting and fishing efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of salvage tools, and in particular to a geological drilling pipe extraction device and a pipe extraction method. Background Art

[0002] In geological core drilling projects, collapse and diameter shrinkage often occur, leading to frequent drilling failures, such as drill rod disengagement, drill rod breakage accidents, and the inability to pull out the technical casing in the hole. These technical problems have brought great difficulties to the drilling construction. Not only is the drilling efficiency low, but the drilling quality is also difficult to achieve the geological purpose, which seriously affects the geological exploration work.

[0003] In the prior art, the tools used for salvaging fallen objects require that the fish top shape of the fallen objects in the well is regular and the inner and outer diameters are accurate. The corresponding inner and outer salvage tools must have a sufficiently effective salvage method at the fish top position to capture the fallen objects. The captured fallen objects cannot be stuck in the well, otherwise the salvage cannot be successful and is easily affected by the salvage environment, resulting in poor salvage effect of fallen objects. When salvaging abandoned or damaged casing, it is necessary to first lower the cutting tool into the well, cut the casing at the appropriate position, and then raise the cutting tool to the surface. Then lower the salvage tool into the well, salvage the cut casing, and then salvage the casing to the surface. The above method requires lowering two different tools into the well for cutting and salvaging the casing, and it is impossible to complete the cutting and salvaging of the casing at one time, resulting in a relatively low efficiency of casing cutting and salvaging. Summary of the invention

[0004] The object of the present invention is to provide a geological drilling pipe extraction device and a pipe extraction method, which can solve the problems raised by the above-mentioned background technology in view of the shortcomings of the prior art.

[0005] The technical solution of the present invention is achieved in this way:

[0006] The present invention provides a geological drilling pipe extraction device, comprising a core shaft, an external suspension joint, an internal suspension joint and a slip structure, the core shaft is arranged in the internal suspension joint, the slip structure is sleeved on the outer side wall of the core shaft, the external suspension joint is sleeved on the outer side wall of the internal suspension joint, the external suspension joint and the slip structure are detachably connected, a tile radial movement expansion structure for controlling the slip structure is provided in the core shaft, and an expansion and milling structure is provided at the end of the core shaft away from the internal suspension joint.

[0007] In some technical solutions of the present invention, the cava structure includes a cava connecting member and a plurality of cava; the cava connecting member is detachably connected to an external suspension joint; a plurality of cava are arranged around the outer wall of the cava connecting member; a plurality of mounting grooves are provided on the outer wall of the cava connecting member; and limit frames connected to the cava are provided in the mounting grooves.

[0008] In some technical schemes of the present invention, the diameter expansion structure includes multiple push rods, an annular groove is provided on the outer wall of the core shaft, a displacement seat is provided in the annular groove, and a plurality of sink grooves corresponding to the push rods are arranged around the outer wall of the displacement seat; a second inclined surface is provided on the bottom of the sink groove, the reverse extension line of the second inclined surface intersects with the axis of the core shaft, and the angle between the two is an acute angle; a guide groove is provided on the side wall of the second inclined surface, a guide block connected to the push rod is slidably provided in the guide groove, the push rod is connected to a limit frame slidably arranged in the installation groove, and an adjustment spring connected to the sink groove is sleeved on the push rod; an injection channel is provided on the inner wall of the inner suspension joint, and a booster chamber connected to the injection channel is provided between the outer suspension joint and the inner suspension joint.

[0009] In some technical solutions of the present invention, a sealing structure is provided on the side wall where the outer suspension joint contacts the inner suspension joint.

[0010] In some technical solutions of the present invention, an installation chamber is provided between the external suspension joint and the core shaft, and a first spring connected to the slip connector is provided in the installation chamber.

[0011] In some technical schemes of the present invention, the expanding and milling structure includes a drill bit rack, a liquid supply channel is opened in the core shaft along its axial direction, the liquid supply channel is connected with the internal suspension joint, the drill bit rack is installed on the core shaft, and the drill bit rack is connected with the liquid supply channel; a plurality of mounting openings are arranged around the outer wall of the drill bit rack, and an expanding and milling drill bit is rotatably arranged in the mounting openings, a piston is slidably arranged in the drill bit rack, a piston rod is arranged on the piston, and the piston rod sleeve is provided with a second spring connected to the inner wall of the drill bit rack, an inner arc surface is opened on the inner side of the expanding and milling drill bit, and the middle section of the inner arc surface abuts against the free end of the piston rod.

[0012] In some technical solutions of the present invention, a guide stabilizer is provided on the free end of the drill bit holder.

[0013] In some technical solutions of the present invention, a truncated platform structure is provided on the outer side wall of the core shaft, and a first inclined surface adapted to the conical surface of the truncated platform structure is provided on the inner side wall of the slip.

[0014] In some technical solutions of the present invention, a tooth groove structure is provided on the outer wall of the free end of the slip.

[0015] The steps for taking the tube are:

[0016] After the expansion and milling structure installed on the mandrel is lowered to the position where cutting is required, the slips in the slip structure are in a contracted state;

[0017] Injecting high-pressure well-washing fluid into the drill bit rack increases the pressure difference between the two ends of the piston in the drill bit rack, forcing the piston to move downward, and push the expansion and milling drill bit outward through the piston rod to open and cut the pipe wall;

[0018] When the pipe wall is completely cut, the external high-pressure drilling fluid is introduced into the inner hanging joint through the pipeline and then enters the pressurized chamber through the injection channel, so that the outer hanging joint moves upward in the vertical direction on the core shaft in a relatively static state;

[0019] At this time, the external hanging joint pulls the slip connector to move in the vertical direction, and pushes out the limit frame through the diameter expansion structure, thereby forcing the slip to move radially along the core shaft, realizing the expansion of the slip structure, so that the slip gradually contacts the inner wall of the pipe to be salvaged;

[0020] Then, the mandrel connected to the inner suspension joint is lifted by the salvage equipment, and the mandrel moves upward in the vertical direction. At this time, the vertebral structure will squeeze the slips to apply a radial thrust, so that the slips engage with the inner wall of the pipe to be salvaged to perform the salvage operation on the pipe.

[0021] Compared with the prior art, the present invention has at least the following advantages or beneficial effects:

[0022] The core shaft is provided with a tile radial movement expansion structure for controlling the slip structure, so that the slip structure can adapt to pipes with different inner diameters, and the slip structure bites with the pipe after the expansion, which is convenient for salvaging the pipe and improves the adaptability of the structure; and in the process of not lifting the core shaft, the slip structure can bite the pipe first under the action of high-pressure drilling fluid, avoiding the long bite distance that cannot salvage the pipe with a smaller pipe length to be salvaged;

[0023] The conical surface of the truncated platform structure will squeeze the first inclined surface on the slip that matches it, thereby exerting a radial thrust on the slip in the displacement slip structure, and cooperate with the expansion structure to limit the slip, preventing the slip from retreating and causing the problem of engagement failure between the slip and the pipe fitting;

[0024] The expansion and milling structure adopts the principle of wedge top tension and convergence, and uses the force of hydraulic driving to make the expansion and milling drill bit abut against the inner wall of the casing. Then, the rotating telescopic end of the rotating salvage equipment drives the expansion and milling structure to make a circular motion to achieve the purpose of cutting the pipe body. The expansion and milling structure cooperates with the slip structure to complete the cutting and salvage of the casing at one time, thereby improving the efficiency of casing cutting and salvage. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0027] Figure 2 It is a schematic diagram of a half-section structure of the present invention from a first viewing angle;

[0028] Figure 3 It is a schematic diagram of a half-section structure of the present invention from a second viewing angle;

[0029] Figure 4 It is a schematic diagram of a half-section structure after the slip structure and the mandrel are combined in the present invention;

[0030] Figure 5 It is a three-dimensional schematic diagram of the slip structure in the present invention;

[0031] Figure 6 for Figure 4 A schematic diagram of the local enlarged structure at point A in the middle;

[0032] Figure 7 This is a schematic diagram of the cross-sectional structure of the guide centralizer.

[0033] Icons: 1. Inner suspension joint; 2. Outer suspension joint; 3. Slip structure; 4. Slip connector; 5. Drill bit holder; 6. Mandrel; 7. Mounting port; 8. Milling drill bit; 9. Guide straightener; 10. Injection channel; 11. Pressurization chamber; 12. First spring; 13. Lubricating block; 14. Piston; 15. Limit block; 16. Slip; 17. Limit frame; 18. Sink; 19. Guide groove; 20. Guide block; 21. Push rod; 22. Adjustment spring; 23. Limit ring; 24. Second spring; 25. Displacement seat. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Example

[0037] Please refer to Figure 1-Figure 7 shown.

[0038] The present invention provides a geological drilling pipe extraction device and a pipe extraction method, such as Figure 1 , Figure 2 As shown, it includes a core shaft 6 with a center hole opened inside, an external suspension joint 2 in the form of a pipe structure, an internal suspension joint 1 in the form of a pipe structure and a cava structure 3, one end of the core shaft 6 is turned into a stepped shaft neck by a turning process, the shaft neck is inserted into the internal suspension joint 1 and the two are threadedly connected; the cava structure 3 is sleeved on the outer side wall of the core shaft 6, and the two can make relative sliding movements along the axial direction of the core shaft 6; the external suspension joint 2 is sleeved on the outer side wall of the internal suspension joint 1, and the two are clearance-matched and can slide against each other; the external suspension joint 2 and the cava structure 3 are detachably connected, at which time the external suspension joint 2 can drive the cava structure 3 to reciprocate along the axial direction of the core shaft 6, and a tile radial movement expansion structure for controlling the cava structure 3 is provided in the core shaft 6, so that the cava structure can adapt to pipes with different inner diameters, and the cava structure 3 engages with the pipe after the expansion, which is convenient for salvaging the pipe, thereby improving the adaptation range of the present structure.

[0039] In some technical schemes of the present invention, the cava structure 3 includes a cava connector 4 of a pipe structure and a plurality of cava 16. The end of the cava connector 4 is turned into a stepped shaft neck by a turning process. The shaft neck is inserted into the external suspension joint 2 and the two are threadedly connected. The cava 16 is arc-shaped. There are 6 cava 16. When the 6 cava 16 are spliced ​​with each other in sequence, the whole is annular. The cava connector 4 is detachably connected to the external suspension joint 2. A plurality of cava 16 are arranged around the outer wall of the cava connector 4. A plurality of wedge-shaped mounting grooves are provided on the outer wall of the cava connector 4. A limit frame 17 connected to the cava 16 is provided in the mounting groove. The cross-section of the limit frame 17 is an isosceles trapezoid. The upper bottom edge of the limit frame 17 is connected to the cava 16, and the limit frame 17 is slidably arranged in the mounting groove, and the friction coefficient between the two is small.

[0040] In some technical solutions of the present invention, the diameter expansion structure includes a plurality of push rods 21, an annular groove is provided on the outer side wall of the core shaft 6, a displacement seat is provided in the annular groove, the displacement seat 25 is annular after two semicircular rings are spliced ​​by countersunk bolts, and the displacement seat 25 can reciprocate along the axis of the core shaft 6 in the annular groove, and a plurality of sink grooves 18 corresponding to the push rods 21 are provided around the outer side wall of the displacement seat, the number of the sink grooves 18 is 6, and the number of the push rods 21 is also 6; a second inclined surface is provided on the bottom of the groove 18, and the reverse extension of the second inclined surface The long line intersects with the axis of the core shaft 6, and the angle between the two is an acute angle, so that the cross section of the sink groove 18 is a right-angled trapezoid; a guide groove 19 is provided on the side wall of the second inclined surface, and a guide block 20 connected to the push rod 21 is slidably provided in the guide groove 19. The guide block 20 is spherical, and most of it is embedded in the guide groove 19. The push rod 21 is fixedly connected to the limit frame 17 slidably provided in the installation groove. An adjustment spring 22 connected to the sink groove 18 is sleeved on the push rod 21, and a limit ring 23 abutting against the adjustment spring 22 is provided on the push rod 21;

[0041] An injection channel 10 is provided on the inner wall of the inner suspension joint 1, and a pressurization chamber 11 is provided between the outer suspension joint 2 and the inner suspension joint 1, and the pressurization chamber 11 is connected to the injection channel 10. The above structure facilitates that when the external high-pressure drilling fluid is introduced into the inner suspension joint 1 through the pipeline and then enters the pressurization chamber 11 through the injection channel 10, the outer suspension joint 2 moves upward in the vertical direction on the core shaft 6 in a stationary state, thereby activating the diameter expansion structure to force the slip 16 to move radially along the core shaft 16, realizing the expansion of the slip structure 3, so that the slip structure 3 can adapt to pipes with different inner diameters. After the diameter expansion, the slip structure 3 can immediately engage with the pipe, which is convenient for lifting the core shaft 6 through the inner suspension joint 1 to salvage the pipe. The above structure can improve the adaptability range of the present structure.

[0042] In some technical solutions of the present invention, a sealing structure is provided on the side wall where the outer suspension joint 2 contacts the inner suspension joint 1. The sealing structure is a sealing ring, which is provided on the inner side of the outer suspension joint 2, and can seal the pressurized chamber 11 provided between the opposite side walls of the outer suspension joint 2 and the inner suspension joint 1, so that the chamber is in a dynamic sealing state, thereby preventing the leakage of drilling fluid, which causes the problem that the expansion structure in the present structure cannot be smoothly deployed.

[0043] In some technical solutions of the present invention, an installation chamber is provided between the external suspension joint 2 and the mandrel 6, and a first spring 12 connected to the slip connector 4 is provided in the installation chamber. After the external high-pressure drilling fluid stops being introduced into the internal suspension joint 1 through the pipeline, the first spring 12 enters the pressurization chamber 11 through the injection channel 10, so that the slip structure can automatically return to the initial position, and then the slip 16 is not engaged with the inner wall of the pipe, which is convenient for the later removal of the pipe and speeds up the construction progress.

[0044] In some technical solutions of the present invention, a truncated platform structure integrally formed therewith is provided on the outer side wall of the mandrel 6, and a first inclined surface adapted to the conical surface of the truncated platform structure is provided on the inner side wall of the slip 16. In the above structure, when the operator lifts the mandrel 6 through the inner suspension joint 1, the mandrel 6 moves upward in the vertical direction, and the conical surface of the truncated platform structure at this time will squeeze the first inclined surface adapted therewith on the slip 16, thereby applying a radial thrust to the slip 16 in the displacement slip structure, and cooperate with the expansion structure to limit the slip 16, preventing the slip 16 from retreating and causing the problem of failure of the engagement between the slip and the pipe fitting.

[0045] When the external high-pressure drilling fluid does not continue to be introduced into the inner suspension joint 1 through the pipeline and then enters the pressurized chamber 11 through the injection channel 10, and no vertical pulling force is applied to the core shaft 6, the truncated structure on the core shaft 6 gradually loses contact with the first inclined surface.

[0046] In some technical solutions of the present invention, a tooth groove structure is provided on the outer wall of the free end of the slip 16. The tooth groove structure is a groove formed on the slip 16 by a turning process, which is used to increase the contact area between the slip 16 and the internal thread on the inner wall of the pipe fitting, and the tooth groove structure occupies a longer area of ​​the slip 16, so as to avoid that the tooth groove structure on the outer wall of the slip 16 is worn flat after long-term use and cannot be well engaged with the pipe fitting.

[0047] The specific working process of the expansion structure in the salvage structure is as follows: first, the above structure is assembled, and then the inner hanging joint 1 is hung on the telescopic end of the salvage equipment, and then the salvage structure is lowered. At this time, the slip 16 is in a contracted state, and the slip 16 enters the pipe to be salvaged together with the core shaft 6. Then, the external high-pressure drilling fluid is introduced into the inner hanging joint 1 through the pipeline and then enters the boosting chamber 11 through the injection channel 10, so that the outer hanging joint 2 moves upward in the vertical direction on the core shaft 6 which is in a relatively static state. At this time, the outer hanging joint 2 pulls the slip connector 4 to move in the vertical direction, and drives the displacement seat 25 to move to a state of abutting against the upper top wall of the annular groove. At this time, the outer hanging joint 2 continues to pull the slip connector 4 to move in the vertical direction, and the push rod 21 located in the displacement seat 25 is restricted by the second inclined surface, and gradually pushes out the limit frame 17, thereby forcing the slip 16 to move radially along the core shaft 16, thereby realizing the expansion of the slip structure 3, so that the outer wall of the slip structure 3 is in contact with the pipe to be salvaged. The inner wall of the pipe fitting gradually contacts, and after the two structures are engaged, high-pressure drilling fluid is continuously injected into the inner suspension joint 1; then the core shaft 6 connected to the inner suspension joint 1 is lifted by the salvaging equipment, and the core shaft 6 moves upward in the vertical direction. At this time, the conical surface of the truncated platform structure will squeeze the first inclined surface on the slip 16 adapted to it, thereby applying a radial thrust to the slip 16 in the displacement slip structure, and during the process of the core shaft 6 moving upward in the vertical direction, the inner suspension joint 1 connected thereto will continue to move upward in the vertical direction, and the injection channel 10 located therein will change from a state connected to the pressurized chamber 11 to a closed state, and the pressurized chamber 11 becomes a closed state, and it still retains high-pressure drilling fluid. When the truncated platform structure located on the core shaft 6 limits the slip 16, the slip 16 is engaged with the inner wall of the pipe fitting, and the pipe fitting can be salvaged, and then, the high-pressure drilling fluid injection into the inner suspension joint 1 can be stopped, and there will be no problem of slip 16 retreating, thereby achieving the purpose of saving resources.

[0048] In some technical solutions of the present invention, the end of the mandrel 6 away from the inner suspension joint 1 is detachably provided with a milling structure. The provided structure can be lowered into the pipe to be salvaged together with the salvage structure, and the discarded or damaged casing can be cut off before salvage.

[0049] The expansion and milling structure includes a drill bit frame 5 which is a hollow pipe structure inside, a liquid supply channel is opened in the mandrel 6 along its axial direction, the liquid supply channel is connected with the inner suspension joint 1, the drill bit frame 5 is installed on the mandrel 6, the mandrel 6 and the drill bit 5 are detachably connected by a threaded connection, and the drill bit frame 5 is connected with the liquid supply channel; a plurality of rectangular mounting openings 7 are arranged around the outer wall of the drill bit frame 5, and an expansion and milling drill bit 8 is arranged in the mounting opening 7 through the rotation of the shaft rod, and the expansion and milling drill bit 8 is an arc-shaped crescent structure as a whole, and a piston member 14 is slidably arranged in the drill bit frame 5, the piston member 14 includes a piston and a piston rod integrally formed with the piston, a sealing ring is provided between the piston and the inner wall of the drill bit frame 5 to ensure that the two can slide relative to each other, and the piston rod sleeve is provided with a second spring 24 connected to the inner wall of the drill bit frame 5, and an inner arc surface is opened on the inner side of the expansion and milling drill bit 8, and the middle section of the inner arc surface abuts against the free end of the piston rod.

[0050] Preferably, the liquid supply channel and the liquid injection channel are operated by two liquid injection pipes respectively to avoid mutual interference between the two and affect the normal operation of the salvage device.

[0051] Preferably, a drainage hole is provided in the middle and lower part of the drill bit frame 5 .

[0052] The expansion and milling structure adopts the principle of wedge top tension and convergence, and uses the force of hydraulic driving to make the expansion and milling drill bit 8 abut against the inner wall of the casing. Then, the expansion and milling structure is driven to make a circular motion by the rotating telescopic end of the rotating salvage equipment to achieve the purpose of cutting the pipe body.

[0053] After lowering the expansion and milling structure installed on the mandrel 6 to the position where cutting is required, the drill tool is rotated at the specified speed under the condition of stopping the pump. After a few minutes, the pump is turned on to circulate the drilling fluid at the specified displacement. Due to the flow limiting effect of the pressure regulating assembly, the pressure difference at both ends of the piston in the drill bit frame 5 increases, forcing the piston to move downward, and the piston rod pushes the milling drill bit to open outward to cut the pipe wall. There are four expansion and milling drill bits 8 in a group. The inner side of the expansion and milling drill bit 8 is an inclined convex surface. At the beginning of milling, the expansion and milling drill bit is not opened in place, and the pump pressure is in a high state. As the piston rod moves downward, the four expansion and milling drill bits 8 open to cut the pipe body. When the pipe wall is completely cut, the piston in the piston assembly moves to the lower side of the drain hole, and the liquid supply channel is connected to the inside of the pipeline through the drain hole. In this way, the flow limiting plug is fully opened. At this time, the circulating pressure in the liquid supply channel will drop significantly, which is an indication that the pipe wall has been cut.

[0054] If the lower pipe body is to be cut through by the expansion and milling structure, when the pipe wall is cut through by the expansion and milling drill bit 8, the expansion and milling drill bit 8 will be fully opened and the pipe body can be cut downwards. After the operation is completed, the circulation of drilling fluid is stopped, the piston assembly moves upward under the action of the spring force, and the blade automatically retracts. At this time, the above structure is lifted to the top of the fish head to salvage the upper casing, and the tool can also be pulled out from the wellbore.

[0055] In some technical solutions of the present invention, a guide centralizer 9 is provided on the free end of the drill bit frame 5. The guide centralizer 9 facilitates the above-mentioned salvage structure to smoothly enter the pipe to be salvaged, thereby accelerating the construction progress of the structure. A lubricating block 13 is provided on the outer wall of the guide centralizer 9, and the lubricating block 13 is embedded in the tooth groove provided on the outer wall of the guide centralizer 9 to avoid dry friction when the guide centralizer 9 contacts the pipe to be salvaged, thereby causing the guide centralizer 9 to be aggravated in wear.

[0056] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A geological drilling pipe extraction device, characterized in that: The invention comprises a core shaft (6), an external suspension joint (2), an internal suspension joint (1) and a slip structure (3), wherein the core shaft (6) is arranged in the internal suspension joint (1), the slip structure (3) is sleeved on the outer wall of the core shaft (6), the external suspension joint (2) is sleeved on the outer wall of the internal suspension joint (1), the external suspension joint (2) and the slip structure (3) are detachably connected, and a tile radial movement expansion structure for controlling the slip structure (3) is arranged in the core shaft (6).

2. A geological drilling pipe extraction device according to claim 1, characterized in that: The slip structure (3) comprises a slip connector (4) and a plurality of slips (16); the slip connector (4) is detachably connected to the external suspension joint (2); the plurality of slips (16) are arranged on the outer wall of the slip connector (4); the outer wall of the slip connector (4) is provided with a plurality of mounting grooves; each of the mounting grooves is provided with a limit frame (17) connected to the slip (16).

3. A geological drilling pipe extraction device according to claim 2, characterized in that: The diameter expansion structure comprises a plurality of push rods (21); an annular groove is provided on the outer wall of the core shaft (6); a displacement seat is provided in the annular groove; a plurality of sink grooves (18) corresponding to the push rods (21) are provided around the outer wall of the displacement seat; a second inclined surface is provided on the bottom of the sink groove (18); a reverse extension line of the second inclined surface intersects with the axis of the core shaft (6), and the angle between the two is an acute angle; a guide groove (19) is provided on the side wall of the second inclined surface; the guide groove (19) is provided on the outer .... A guide block (20) connected to the push rod (21) is slidably provided in the groove (19); the push rod (21) is connected to a limit frame (17) slidably provided in the mounting groove; an adjusting spring (22) connected to the sink groove (18) is sleeved on the push rod (21); an injection channel (10) is provided on the inner wall of the inner suspension joint (1); a pressurization chamber (11) connected to the injection channel (10) is provided between the outer suspension joint (2) and the inner suspension joint (1).

4. A geological drilling pipe extraction device according to claim 3, characterized in that: An installation chamber is provided between the external suspension joint (2) and the core shaft (6), and a first spring (12) connected to the slip connector (4) is provided in the installation chamber.

5. A geological drilling pipe extraction device according to any one of claims 1 to 4, characterized in that: The end of the core shaft (6) facing away from the inner suspension joint (1) is provided with an expansion and milling structure.

6. A geological drilling pipe extraction device according to claim 5, characterized in that: The expansion and milling structure comprises a drill bit frame (5), a liquid supply channel is provided in the mandrel (6) along its axial direction, the liquid supply channel is communicated with the inner suspension joint (1), the drill bit frame (5) is installed on the mandrel (6), and the drill bit frame (5) is communicated with the liquid supply channel; a plurality of mounting openings (7) are arranged around the outer wall of the drill bit frame (5), and an expansion and milling drill bit (8) is rotatably arranged in each of the mounting openings (7); a piston member (14) is slidably arranged in the drill bit frame (5), and the piston member (14) is sleeved with a second spring (24) connected to the inner wall of the drill bit frame (5); an inner arc surface is provided on the inner side of the expansion and milling drill bit (8), and the middle section of the inner arc surface abuts against the free end of the piston member (14).

7. A geological drilling pipe extraction device according to claim 6, characterized in that: A guide stabilizer (9) is provided on the free end of the drill bit frame (5).

8. A geological drilling pipe extraction device according to claim 2, characterized in that: The outer side wall of the core shaft (6) is provided with a truncated platform structure, and the inner side wall of the slip (16) is provided with a first inclined surface adapted to the conical surface of the truncated platform structure.

9. A geological drilling pipe extraction device according to claim 2, characterized in that: A tooth groove structure is provided on the outer wall of the free end of the slip (16).

10. A geological drilling pipe extraction method, characterized in that: According to the pipe removal device according to any one of claims 1 to 9, the pipe removal steps are: After the expansion and milling structure installed on the mandrel (6) is lowered to the position where cutting is required, the slips (16) in the slip structure (3) are in a contracted state; High-pressure well-washing fluid is injected into the drill bit frame (5) to increase the pressure difference between the two ends of the piston member (14) in the drill bit frame (5), forcing the piston member (14) to move downward, and the piston member (14) pushes the expansion and milling drill bit (8) to open outward to the position to cut the pipe wall; When the pipe wall is completely cut open, high-pressure drilling fluid is introduced into the inner suspension joint (1) through the pipeline and then enters the pressurized chamber (11) through the injection channel (10), so that the outer suspension joint (2) moves upward in the vertical direction on the core shaft (6) which is in a relatively static state; At this time, the external hanging joint (2) pulls the slip connector (4) to move in the vertical direction, and pushes out the limit frame (17) through the diameter expansion structure, so that the slip (16) moves along the radial direction of the core shaft (6), realizing the expansion of the slip structure (3), so that the slip (16) gradually contacts the inner wall of the pipe to be salvaged; Subsequently, the mandrel (6) connected to the inner suspension joint (1) is lifted by the salvaging equipment, and the mandrel (6) moves upward in the vertical direction. At this time, the truncated platform structure squeezes the slips (16) to exert a radial thrust, so that the slips (16) engage with the inner wall of the pipe to be salvaged to perform the salvage operation on the pipe.

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