Fishing device and method for fishing broken drill rod in hole

Abstract

The invention provides a fishing device and a fishing method for fishing a broken drill rod in a hole. According to the structure of the fishing device, an air pump of an air supply device is connected with an air bag of an air bag type fishing barrel through an air guide pipe, a centralizer is fixed to a first connecting drill rod, the air bag type fishing barrel is fixed to a second connecting drill rod, and all the connecting drill rods are connected into a whole through end threads. And the calipers can be used for clamping the end part of the connecting drill rod or the broken drill rod in the hole at a drilling hole opening. The salvage method comprises the steps that the air bag is inflated to enable the air bag type salvage barrel to be attached to the connecting drill rod and to be tripped into a drill hole along with the connecting drill rod, the connecting drill rod is rotated through a drilling machine to drive the centralizer to rotate, and therefore the broken drill rod left in the hole is grabbed, and the air bag type salvage barrel is separated from the connecting drill rod by evacuating the air bag. The broken drill rod left in the hole and the connecting drill rod are extruded and bound by lowering the air bag type fishing cylinder and re-inflating the air bag type fishing cylinder, and the air bag type fishing cylinder is lifted up to drive the drill rod left in the hole to rise to the ground, so that the broken drill rod in the hole is fished.

Description

Technical Field

[0001] The invention relates to the technical field of drill pipe salvaging, in particular to a salvaging device and a salvaging method for a broken drill pipe in a salvage hole. Background Art

[0002] Drilling is the process of using a drilling rig, drilling tools and a complete set of process measures to drill cylindrical holes in the stratum, take out rock and mineral samples, explore the occurrence and distribution of minerals, or achieve other geological and technical purposes. However, during drilling construction, drill rods and drill tools often break in the hole, which will directly affect the construction progress. If not handled properly, it will also cause the scrapping of drilling footage and the loss of pipes, thereby causing a large amount of waste of manpower and material resources, increasing production costs, and failing to complete production tasks as planned. Therefore, solving the problem of drill rod breakage during drilling is of great significance to drilling work.

[0003] Traditional drill pipe salvage methods include rope salvage, reverse-wire drill pipe salvage, casing male cone salvage, etc. All of the above salvage methods require the salvage tool to be aligned with the broken drill pipe in the hole, or the broken drill pipe in the hole must be moved to a suitable position before salvage can be performed. However, in actual situations, there are often the following problems: the small borehole diameter leads to limited operating space, the situation in the borehole is complex and changeable, the broken drill pipe has a small diameter, and the broken drill pipe may be skewed. These factors lead to a low success rate and low efficiency of traditional drill pipe salvage methods. It often takes multiple attempts to successfully salvage the broken drill pipe in the hole, which is time-consuming and labor-intensive. Summary of the invention

[0004] In view of the above-mentioned deficiencies of existing salvage equipment and salvage methods, the present invention provides a salvage device and a salvage method for a broken drill pipe in a salvage hole, the purpose of which is to solve one or some defects of existing salvage equipment and salvage methods.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0006] A salvaging device for salvaging a broken drill rod in a hole, comprising an air supply device, an air bag type salvage tube, a centralizer, a plurality of connected drill rods, and a caliper, wherein the air supply device comprises an air pump and an air guide tube; the device is characterized in that the air pump of the air supply device is connected to the air bag of the air bag type salvage tube through the air guide tube, the centralizer is fixed on the first connected drill rod, the air bag type salvage tube is fixed on the second connected drill rod, all the connected drill rods are connected into one by end threads, and the caliper can clamp the end of the connected drill rod or the broken drill rod in the hole at the borehole mouth.

[0007] Specifically, when the salvage device of the present invention is in use, the airbag-type salvage tube can be fixed to the connected drill rod by inflating the airbag-type salvage tube and lowered into the designated position in the borehole along with the connected drill rod, thereby solving the problem that the situation in the borehole is complicated and changeable and the salvage device is difficult to lower into the borehole; since the inner diameter of the airbag-type salvage tube is slightly smaller than the borehole diameter, the salvage range can basically cover the entire borehole, thereby solving the problem that the traditional salvage method requires strict requirements on the position of the broken drill rod in the borehole; by roughening the surface of the airbag and artificially increasing the pressure in the airbag in a controllable manner, the friction between the airbag and the drill rod can be artificially increased to ensure that the broken drill rod in the borehole can be lifted to the ground; the detachable built-in airbag makes the product easy to repair and replace parts; as mentioned above, the salvage device and salvage method have simple components, are sturdy and durable, have clear principles, are not difficult to operate, and have a wide range of applications, and can greatly improve the efficiency and success rate of salvaging broken drill rods in the hole.

[0008] Preferably, the air pump needs to have both inflation and degassing functions; the air guide tube serves as an air delivery channel and is used to connect the air pump and the airbag.

[0009] Preferably, the airbag salvage tube comprises a salvage tube, an airbag, a wire rope, a clasp and a ring with holes; the upper end of the airbag is connected to the ring with holes, and the lower end is connected to the clasp; four rope holes are evenly distributed on the top of the salvage tube with the central axis of the tube as the center; four rope holes are evenly distributed on the ring body of the ring with holes, and the hole positions correspond one by one to the positions of the four rope holes at the top of the salvage tube; one end of the wire rope passes through the above-mentioned rope holes to tie up the salvage tube and the ring with holes and bind the relative positions of the two, and the other end of the wire rope is connected to an external winch.

[0010] Preferably, the salvage tube, the retaining ring and the perforated ring are all made of steel; the airbag is made of polyester or polyurethane; the outer surface of the airbag is arranged with a pattern, and special materials or adhesives are used to increase the friction coefficient between the outer surface of the airbag and the connected drill rod 4 and the broken drill rod in the hole.

[0011] Preferably, the whole formed by the airbag, the clamping ring and the ring with holes must ensure airtightness, and the overall length is equal to or longer than the length of the overshot.

[0012] Preferably, the clamping ring is divided into an inner ring and an outer ring, the outer diameter of the inner ring is smaller than the inner diameter of the overshot tube, and the inner diameter of the outer ring is larger than the outer diameter of the overshot tube; the outer diameter of the perforated ring is smaller than the inner diameter of the overshot tube.

[0013] Preferably, the centralizer comprises a grab hook, a connecting pipe and a locking buckle; the grab hook, the connecting pipe and the locking buckle form an inseparable whole; the size of the slot formed by the grab hook and the locking buckle is larger than the outer diameter of the drill pipe of the broken drill pipe in the hole; the grab hook takes the connecting pipe as the axis, and the diameter of the circle formed by one rotation is larger than the outer diameter of the salvage tube; the connecting pipe and the connected drill pipe are connected by threads; the centralizer is made of steel.

[0014] Preferably, the connecting drill rod is a drill rod commonly used in drilling projects, and there are several quantities and sizes; the caliper is a caliper commonly used in drilling projects, which can cooperate with the interface of the connecting drill rod and the broken drill rod in the hole to clamp the connecting drill rod and the broken drill rod in the borehole at the borehole mouth.

[0015] On the other hand, a salvaging method for a salvaging device of a broken drill pipe in a salvage hole is provided, comprising:

[0016] S1. Connect the centralizer to a connecting drill rod of suitable length through threads, lower it into the borehole, and clamp it at the hole mouth with calipers;

[0017] S2, take another connecting drill pipe of suitable length and insert it into the airbag overshot, and continuously inflate the airbag overshot through the air supply device to fix the airbag overshot on the connecting drill pipe;

[0018] S3, connecting two connecting drill pipes fixed with the airbag overshot tube and connected with the centralizer together through threads;

[0019] S4. Use the drilling rig to lower a number of connected drill pipes one by one, and connect adjacent connected drill pipes together through threads until the airbag overshot tube and the centralizer are brought into the borehole to a suitable depth;

[0020] S5. Drain the gas in the air bag overshot through the air supply device to separate the air bag overshot from the connected drill pipe, and hang the air bag overshot through the wire rope to keep the depth unchanged;

[0021] S6, the drill rig rotates the connected drill rod to drive the centralizer to rotate and hook the broken drill rod in the borehole, and stops rotating the drill rod after confirming that the broken drill rod in the hole enters the slot;

[0022] S7, lowering the wire rope to make the airbag overshot 2 fall downward under the action of gravity, so that the broken drill pipe in the hole stuck by the centralizer passes through the airbag overshot, and finally, the airbag overshot is stuck by the centralizer and stops falling;

[0023] S8, continuously inflate the air bag type overshot tube through the air supply device, so that the broken drill pipe in the hole and the connecting drill pipe are firmly bound together;

[0024] S9, use the winch to roll up the wire rope and lift the airbag-type overshot tube to lift the broken drill pipe in the hole to the ground;

[0025] S10. During the lifting process, the connected drill rods and the broken drill rods in the hole are removed one by one by using calipers.

[0026] As a preferred embodiment, in S1, the length of the connecting drill pipe directly connected to the centralizer should be selected according to the specific situation, but should not be too long;

[0027] Preferably, in S2, the end of the overshot without the rope hole is the bottom of the overshot; the ring with holes is placed into the cylinder body from the bottom of the overshot, and the overshot is tilted to align the rope hole of the ring with the rope hole on the overshot. At this time, the clamp ring should be just stuck on the bottom of the overshot, and the wire rope is passed through the rope hole for tying to complete the assembly of the airbag overshot;

[0028] As a preferred embodiment, in S3, when the two connected drill pipes are connected, a sufficient distance needs to be reserved between the bottom of the airbag overshot tube and the centralizer, so that the centralizer can subsequently centralize the broken drill pipe in the hole, so that the airbag overshot tube can simultaneously receive the broken drill pipe in the hole and the connected drill pipe into the tube;

[0029] Preferably, in S4, a balloon-type overshot and a centralizer of appropriate size may be selected according to the borehole diameter;

[0030] Preferably, in S5, the gas in the airbag overshot is evacuated as much as possible through the air supply device to increase the space in the overshot, so as to facilitate the broken drill pipe in the hole to pass through the airbag overshot;

[0031] In addition to the technical problems solved by the present invention, the technical features that constitute the technical solution, and the beneficial effects brought about by the technical features of the technical solution described above, the present invention provides other technical problems that can be solved, other technical features included in the technical solution, and the beneficial effects brought about by these technical features, which will be further described in detail in the specific implementation methods.

[0032] When the salvage device of the present invention is in use, the airbag can be inflated to make the airbag-type salvage tube attached to the connected drill rod and lowered into the borehole along with the connected drill rod. The connected drill rod is rotated by the drilling rig to drive the stabilizer to rotate, thereby grabbing the broken drill rod left in the borehole, and the airbag is evacuated to separate the airbag-type salvage tube from the connected drill rod. The broken drill rod left in the hole and the connected drill rod are squeezed and bound by lowering the airbag-type salvage tube and re-inflating it. The airbag-type salvage tube can be lifted up to drive the drill rod left in the hole to rise to the ground, thereby realizing the salvage of the broken drill rod in the hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the implementation of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0034] Figure 1It is a schematic structural diagram of the salvage device without calipers of the present invention.

[0035] Figure 2 It is a schematic diagram of the structure of the centralizer of the present invention.

[0036] Figure 3a It is a top view of the snap ring of the present invention.

[0037] Figure 3b It is a front cross-sectional view of the snap ring of the present invention.

[0038] Figure 4a It is a schematic diagram of the inflation structure of the airbag overshot of the present invention.

[0039] Figure 4b It is a schematic diagram of the deflation structure of the airbag overshot of the present invention.

[0040] Figure 5 It is an expanded view of the airbag overshot and a schematic structural diagram of the air supply device of the present invention.

[0041] Figure 6 It is a schematic diagram of the structure of the airbag, the clamping ring and the ring with holes of the present invention.

[0042] Figure 7a It is a schematic diagram of S1 and S2 in the salvage method of the present invention.

[0043] Figure 7b It is a schematic diagram of S3 and S4 in the salvage method of the present invention.

[0044] Figure 8 It is a schematic diagram of S5 to S6 in the salvage method of the present invention.

[0045] Figure 9a Schematic diagram of S7 in the salvage method of the present invention

[0046] Figure 9b It is a schematic diagram of S8 in the salvage method of the present invention.

[0047] Fig.10a It is a schematic diagram of S9 in the salvage method of the present invention.

[0048] Fig.10b This is a schematic diagram of clamping the broken drill pipe in the hole at the borehole opening in S10 in the salvage method of the present invention.

[0049] Fig.11a This is a schematic diagram of dismantling a broken drill pipe in a hole in S10 in the salvage method of the present invention.

[0050] Fig.11b This is a schematic diagram of dismantling broken drill pipes in a hole one by one in S10 in the salvage method of the present invention.

[0051] Among them: 1. Air supply device; 2. Air bag type salvage tube; 3. Stabilizer; 4. Connecting drill pipe; 5. Caliper; 1-1. Air pump; 1-2. Air guide tube; 2-1. Salvage tube; 2-2. Built-in air bag; 2-3. Wire rope; 2-4. Snap ring; 2-5. Ring with hole; 3-1. Grapple hook; 3-2. Connecting pipe; 3-3. Lock buckle. DETAILED DESCRIPTION

[0052] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and understandable, 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 only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0053] Please refer to Figure 1 , Figure 2 , Figure 3a , Figure 3b , Figure 4a , Figure 4b , Figure 5 , Figure 6 The present invention provides a salvage device for salvaging a broken drill rod in a hole, comprising an air supply device 1, an air bag type salvage tube 2, a straightener 3, a plurality of connected drill rods 4, and a caliper 5. The air supply device 1 comprises an air pump 1-1 and an air guide tube 1-2; the characteristic is that the air pump 1-1 of the air supply device 1 is connected to the air bag 2-2 of the air bag type salvage tube 2 through the air guide tube 1-2, the straightener 3 is fixed on the first connected drill rod 4, the air bag type salvage tube 2 is fixed on the second connected drill rod 4, all the connected drill rods 4 are connected into one by end threads, and the caliper 5 can clamp the end of the connected drill rod 4 or the broken drill rod in the hole at the borehole mouth.

[0054] Furthermore, the air pump 1-1 has two functions of inflation and degassing; the air guide tube 1-2 serves as an air delivery channel for connecting the air pump 1-1 and the airbag 2-2.

[0055] Furthermore, the airbag salvage tube 2 comprises a salvage tube 2-1, an airbag 2-2, a wire rope 2-3, a clasp 2-4, and a ring with holes 2-5; the upper end of the airbag 2-2 is connected to the ring with holes 2-5, and the lower end is connected to the clasp 2-4; four rope holes are evenly distributed on the top of the salvage tube 2-1 with the central axis of the tube as the center; four rope holes are evenly distributed on the ring body of the ring with holes 2-5, and the hole positions correspond to the positions of the four rope holes at the top of the salvage tube 2-1 one by one; one end of the wire rope 2-3 passes through the above-mentioned rope holes to tie up the salvage tube 2-1 and the ring with holes 2-5 and bind the relative positions of the two, and the other end of the wire rope 2-3 is connected to an external winch.

[0056] Furthermore, the salvage tube 2-1, the retaining ring 2-4, and the perforated ring 2-5 are all made of steel; the airbag 2-2 is made of polyester, and can also be made of polyurethane; the outer surface of the airbag 2-2 is arranged with a pattern to increase the friction coefficient between the outer surface of the airbag and the connected drill rod 4 and the broken drill rod in the hole, and the friction coefficient between the outer surface of the airbag and the connected drill rod 4 and the broken drill rod in the hole can also be increased by applying an adhesive.

[0057] Furthermore, the whole formed by the airbag 2-2, the clamping ring 2-4 and the perforated ring 2-5 must ensure airtightness, and the overall length is equal to or slightly longer than the length of the salvage tube 2-1.

[0058] Furthermore, the clamping ring 2-4 is divided into an inner ring and an outer ring, the outer diameter of the inner ring is slightly smaller than the inner diameter of the salvage tube 2-1, and the inner diameter of the outer ring is slightly larger than the outer diameter of the salvage tube 2-1; the outer diameter of the perforated ring 2-5 is slightly smaller than the inner diameter of the salvage tube 2-1.

[0059] Furthermore, the centralizer 3 includes a grab hook 3-1, a connecting pipe 3-2, and a lock 3-3; the grab hook 3-1, the connecting pipe 3-2, and the lock 3-3 form an inseparable whole; the size of the card slot formed by the grab hook 3-1 and the lock 3-3 is slightly larger than the outer diameter of the drill pipe broken in the hole; the grab hook 3-1 takes the connecting pipe 3-2 as the axis, and the diameter of the circle formed by one rotation is larger than the outer diameter of the salvage tube 2-1; the connecting pipe 3-2 is connected to the connecting drill pipe 4 by threads; the centralizer 3 is made of steel.

[0060] Furthermore, the connecting drill rod 4 is a drill rod commonly used in drilling projects, and there are several quantities and several sizes; the caliper 5 is a caliper commonly used in drilling projects, which can cooperate with the interface of the connecting drill rod 4 and the broken drill rod in the hole to clamp the connecting drill rod 4 and the broken drill rod in the hole at the borehole mouth.

[0061] It should also be noted that the air pump 1-1 with the functions of inflation and degassing can be realized in the prior art. During the salvage process, a drilling rig and a winch are required to cooperate with the lowering / lifting of the drill rod, which are no longer listed as a separate device in the present invention. In Figure 4, when the airbag-type salvage tube 2 is filled with air, the central circular diameter d must be much smaller than the outer diameter of the connected drill rod 4; when the airbag-type salvage tube 2 is degassing air, the central circular diameter D must be much larger than the sum of the outer diameter of the connected drill rod 4 and the outer diameter of the broken drill rod in the hole.

[0062] On the other hand, referring to FIGS. 7 to 11 , the present invention provides a salvaging method of a salvaging device for a broken drill pipe in a salvage hole, comprising the following steps:

[0063] S1, connect the centralizer 3 to a connecting drill rod 4 of suitable length through threads, lower it into the borehole, and clamp it at the hole opening with a caliper 5;

[0064] Specifically, the length of the connecting drill rod 4 directly connected to the centralizer 3 should be selected to a suitable length according to the specific situation, but should not be too long.

[0065] S2, take another connecting drill rod 4 of suitable length and insert it into the airbag overshot 2, and continuously inflate the airbag overshot 2 through the air supply device 1 to fix the airbag overshot 2 on the connecting drill rod 4;

[0066] Specifically, the end of the salvage tube 2-1 without the rope hole is the bottom of the tube; the ring with holes 2-5 is placed into the tube body from the bottom of the salvage tube 2-1, and the salvage tube 2-1 is tilted to align the rope hole of the ring with holes 2-5 with the rope hole on the salvage tube 2-1. At this time, the clamping ring 2-4 should be just stuck in the bottom of the salvage tube 2-1, and the wire rope 2-3 is passed through the rope hole for tying to complete the assembly of the airbag salvage tube 2.

[0067] S3, connecting two connecting drill pipes 4 fixed with the airbag overshot 2 and connected with the centralizer 3 together through threads;

[0068] Specifically, when the two connected drill pipes 4 are connected, a sufficient distance must be reserved between the bottom of the airbag overshot tube 2 and the stabilizer 3 to facilitate the subsequent stabilizer 3 to straighten the broken drill pipe in the hole, so that the airbag overshot tube 2 can simultaneously incorporate the broken drill pipe in the hole and the connected drill pipe 4 into the tube.

[0069] S4, a number of connecting drill rods 4 are lowered one by one through the drilling rig, and adjacent connecting drill rods 4 are connected together by threads until the airbag overshot tube 2 and the centralizer 3 are brought into the borehole to a suitable depth;

[0070] S1, S2 correspondence Figure 7a , S3 and S4 correspond to Figure 7b The appropriate size of the airbag overshot tube 2 and the straightener 3 can be selected according to the borehole diameter; the appropriate depth means that the broken drill pipe in the hole does not contact the airbag overshot tube 2 after being straightened, but the distance from the airbag overshot tube 2 should not be too far.

[0071] S5, draining the gas in the airbag overshot 2 through the air supply device 1, so that the airbag overshot 2 is separated from the connected drill pipe 4, and the airbag overshot 2 is suspended by the wire rope 2-3 and the depth is kept unchanged;

[0072] S6, the drill rig rotates the connected drill rod 4 to drive the centralizer 3 to rotate and hook the broken drill rod in the borehole, and stops rotating the drill rod after confirming that the broken drill rod in the hole enters the slot;

[0073] S5 to S6 correspondence Figure 8 Specifically, the gas in the airbag overshot tube 2 is evacuated as much as possible through the air supply device 1 to maximize the space in the tube, so as to facilitate the broken drill pipe in the hole to pass through the airbag overshot tube 2; the rotation direction of the drill pipe should be as follows Figure 8As shown, the broken drill rod in the hole can be successfully inserted into the groove.

[0074] S7, lowering the wire rope 2-3 to make the airbag overshot 2 fall downward under the action of gravity, so that the broken drill pipe in the hole stuck by the centralizer 3 passes through the airbag overshot 2, and finally, the airbag overshot 2 is stuck by the centralizer 3 and stops falling; S7 corresponds to Figure 9a .

[0075] S8, continuously inflate the airbag overshot tube 2 through the air supply device 1, so that the broken drill pipe in the hole is firmly bound to the connecting drill pipe 4;

[0076] S8 compatible Figure 9b Specifically, it is preferred that the broken drill pipe in the hole can completely pass through the airbag overshot 2.

[0077] S9, use the winch to roll up the wire rope 2-3 and lift the airbag-type salvage tube 2 to drive the broken drill pipe in the hole to the ground; S9 corresponds to Fig.10a .

[0078] S10, during the lifting process, the connected drill rods 4 and the broken drill rods in the hole are removed one by one by using the caliper 5. Fig.10b , Fig.11a , Fig.11b .

[0079] In the present invention, by inflating the airbag-type salvage tube, the airbag-type salvage tube and the connected drill rod can be fixed and lowered into the designated position in the borehole along with the connected drill rod, thereby solving the problem that the situation in the borehole is complicated and changeable and the salvage device is difficult to lower into the borehole; since the inner diameter of the airbag-type salvage tube is slightly smaller than the borehole diameter, the salvage range can basically cover the entire borehole, thereby solving the problem that the traditional salvage method requires strict requirements on the position of the broken drill rod in the hole; by roughening the surface of the airbag and artificially increasing the pressure in the airbag in a controllable manner, the friction between the airbag and the drill rod can be artificially increased to ensure that the broken drill rod in the hole can be lifted to the ground; the detachable built-in airbag makes the product easy to repair and replace parts; as mentioned above, the salvage device and the salvage method have simple components, are sturdy and durable, have clear principles, are not difficult to operate, and have a wide range of applications, which can greatly improve the efficiency and success rate of salvaging the broken drill rod in the hole.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A salvage device for salvaging a broken drill pipe in a salvage hole, comprising an air supply device (1), an air bag type salvage tube (2), a centralizer (3), a plurality of connected drill pipes (4), and a caliper (5), wherein the air supply device (1) comprises an air pump (1-1) and an air guide tube (1-2); the characteristics are as follows: The air pump (1-1) of the air supply device (1) is connected to the air bag (2-2) of the air bag overshot (2) through the air guide tube (1-2); the centralizer (3) is fixed on the first connected drill rod (4); the air bag overshot (2) is fixed on the second connected drill rod (4); all the connected drill rods (4) are connected into one piece through end threads; the clamp (5) can clamp the end of the connected drill rod (4) or the broken drill rod in the hole at the borehole mouth.

2. A salvage device for a broken drill pipe in a salvage hole according to claim 1, characterized in that: The air pump (1-1) has two functions: inflation and degassing.

3. A salvage device for a broken drill pipe in a salvage hole according to claim 1, characterized in that: The airbag salvage tube (2) comprises a salvage tube (2-1), an airbag (2-2), a steel wire rope (2-3), a clasp (2-4), and a ring with holes (2-5); the upper end of the airbag (2-2) is connected to the ring with holes (2-5), and the lower end is connected to the clasp (2-4); four rope holes are evenly distributed on the top of the salvage tube (2-1) with the central axis of the tube as the center; four rope holes are evenly distributed on the ring body of the ring with holes (2-5), and the hole positions correspond to the positions of the four rope holes on the top of the salvage tube (2-1); one end of the steel wire rope (2-3) passes through the rope holes to tie up the salvage tube (2-1) and the ring with holes (2-5) and bind the relative positions of the two, and the other end of the steel wire rope (2-3) is connected to an external winch.

4. A salvage device for a broken drill pipe in a salvage hole according to claim 3, characterized in that: The salvage tube (2-1), the clamping ring (2-4), and the holed ring (2-5) are all made of steel; the airbag (2-2) is made of polyester or polyurethane material; and the outer surface of the airbag (2-2) is provided with patterns or coated with adhesive to increase the friction coefficient between the outer surface of the airbag and the connected drill rod (4) and the broken drill rod in the hole.

5. A salvage device for salvaging a broken drill pipe in a salvage hole according to claim 4, characterized in that: The whole formed by the air bag (2-2), the clamping ring (2-4) and the ring with holes (2-5) must ensure air tightness, and the overall length is equal to or longer than the tube length of the overshot tube (2-1).

6. A salvage device for salvaging a broken drill pipe in a salvage hole according to claim 5, characterized in that: The clamping ring (2-4) is divided into an inner ring and an outer ring, the outer diameter of the inner ring is smaller than the inner diameter of the salvage tube (2-1), and the inner diameter of the outer ring is larger than the outer diameter of the salvage tube (2-1); the outer diameter of the holed ring (2-5) is smaller than the inner diameter of the salvage tube (2-1).

7. A salvage device for salvaging a broken drill pipe in a salvage hole according to claim 1, characterized in that: The centralizer (3) comprises a grab hook (3-1), a connecting pipe (3-2) and a lock buckle (3-3); the grab hook (3-1), the connecting pipe (3-2) and the lock buckle (3-3) form an inseparable whole; the size of the slot formed by the grab hook (3-1) and the lock buckle (3-3) is larger than the outer diameter of the drill pipe broken in the hole; the grab hook (3-1) takes the connecting pipe (3-2) as an axis, and forms a circle with a diameter larger than the outer diameter of the salvage tube (2-1) after one rotation; the connecting pipe (3-2) is connected to the connecting drill pipe (4) by means of threads; the centralizer (3) is made of steel.

8. A salvaging method using a salvaging device for a broken drill pipe in a salvage hole according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Connect the centralizer (3) to a connecting drill rod (4) of suitable length by threading, lower it into the borehole, and clamp it at the hole mouth with a caliper (5); S2, take another connecting drill rod (4) of suitable length and insert it into the airbag overshot (2), and continuously inflate the airbag overshot (2) through the air supply device (1) so that the airbag overshot (2) is fixed on the connecting drill rod (4); S3, connecting two connecting drill rods (4) to which the airbag-type overshot tube (2) is fixed and to which the centralizer (3) is connected, by means of threads; S4, a number of connecting drill rods (4) are lowered one by one through the drilling rig, and adjacent connecting drill rods (4) are connected together through threads until the airbag overshot tube (2) and the centralizer (3) are brought into the borehole to a suitable depth; S5, draining the gas in the airbag overshot (2) through the air supply device (1), separating the airbag overshot (2) from the connected drill pipe (4), and suspending the airbag overshot (2) through the steel wire rope (2-3) to keep the depth unchanged; S6, rotating the connected drill rod (4) through the drilling rig to drive the centralizer (3) to rotate and hook the broken drill rod in the borehole, and stopping the rotation of the drill rod after confirming that the broken drill rod in the hole enters the slot; S7, lowering the wire rope (2-3) to make the airbag overshot (2) fall downward under the action of gravity, so that the broken drill pipe in the hole stuck by the centralizer (3) passes through the airbag overshot (2), and finally, the airbag overshot (2) is stuck by the centralizer (3) and stops falling; S8, continuously inflating the air bag type overshot tube (2) through the air supply device (1) so that the broken drill pipe in the hole is firmly bound to the connecting drill pipe (4); S9, using a winch to roll up the wire rope (2-3) to lift the airbag-type overshot tube (2) and drive the broken drill pipe in the hole to rise to the ground; S10, during the lifting process, the connected drill rods (4) and the broken drill rods in the hole stuck at the drilling opening are removed one by one by using the calipers (5).

9. A salvaging method for a salvaging device for a broken drill pipe in a salvage hole according to claim 8, characterized in that: In S1, the length of the connecting drill pipe (4) directly connected to the centralizer (3) should be selected to a suitable length according to the specific situation.

10. The salvaging method of the salvaging device for a broken drill pipe in a salvage hole according to claim 8, characterized in that: In S5, the gas in the airbag overshot (2) is evacuated as much as possible through the air supply device (1) to increase the space in the overshot, making it easier for the broken drill pipe in the hole to pass through the airbag overshot (2).

Images