Salvaging, delivering and placing device for instrument while drilling and method for salvaging, delivering and placing instrument while drilling

Abstract

The invention provides a salvage and delivery device for an instrument while drilling, which comprises an unlocking and locking mechanism sleeved outside a steel wire rope and a salvage and delivery mechanism arranged at the downstream of the unlocking and locking mechanism, and the salvage and delivery mechanism comprises a shell and a pull rod concentrically arranged in the shell, the pull rod is arranged on the base, the pressing cap is arranged at the top end of the pull rod and used for being fixedly connected with the free end of the steel wire rope, the clamping arms are arranged on the pull rod in the circumferential direction at intervals, and hook claws used for being connected with a fishing head of an instrument while drilling in a clamped mode are arranged on the lower end faces of the clamping arms. In addition, the invention further provides a method for salvaging, delivering and placing the instrument while drilling.

Description

Technical Field

[0001] The invention relates to the field of salvaging, delivering and releasing downhole measurement while drilling instruments, and in particular to a salvaging, delivering and releasing device for the measurement while drilling instruments, and a method for salvaging, delivering and releasing the measurement while drilling instruments. Background Art

[0002] Downhole measurement while drilling instruments are one of the necessary and important tools in drilling.

[0003] During the drilling process, due to many complex working conditions underground, such as strong alternating vibrations caused by the inhomogeneous formation when the drill bit cuts the formation, and high temperature environment underground (sometimes exceeding 150°), it is very easy to cause irreversible damage to the internal components of the instrument. In addition, when a battery power failure occurs, the instrument will not work properly, and the drilling project will not be able to continue.

[0004] At present, the solution to the above problem is to pull out all the drilling tools, replace the instruments and equipment on the ground, and then put the tools back in to continue drilling normally. However, it takes a lot of time to pull out the entire drill string at a time, and pulling the drill string is a relatively dangerous task in drilling. It is not only time-consuming and labor-intensive, but also there is a risk of safety accidents at any time.

[0005] CN2881094 discloses a lifting and placing tool, which is composed of a grasping locking mechanism and a releasing mechanism. The grasping locking mechanism is composed of a lifting and placing claw, a tool body, a reset spring, a spring compression sleeve, and a lifting ring component; the releasing mechanism is composed of a lifting and placing claw, a linkage pin, a reset spring, a spring compression sleeve, a release rod, and a pull ring component; the lifting and placing tool is easy to operate when lifting and placing the drilling instrument, and the locking mechanism can ensure the safety of the drilling instrument. At the same time, only the pull ring component needs to be pulled to operate the lifting and placing tool to release the salvage instrument, which improves the operating environment of the operator when lifting and placing the drilling instrument, improves the work efficiency, and makes the operation process clean and tidy; and the linkage pin, release rod, lifting ring component and pull ring component of the lifting and placing tool are removed, and the drilling tool water hole straightener, weighting rod, and steel cable are connected. The device requires the instrument to be manually operated on the ground to realize the grasping and releasing of the drilling instrument. Its main function is to be used when installing and disassembling the instrument at the wellhead, and it does not have the ability to operate underground.

[0006] Therefore, it is desired in the art to provide a fishing and delivering device for a drilling instrument to solve the above technical problems. Summary of the invention

[0007] The purpose of the present invention is to propose a salvage and delivery device for a drilling instrument, which can complete the salvage and delivery of the drilling instrument by lowering the unlocking locking mechanism and the salvage and delivery mechanism through a wire rope, thereby achieving the purpose of replacing the drilling instrument without having to pull out the drill string of the entire well.

[0008] According to a first aspect of the present invention, there is provided a fishing and delivering device for a drilling instrument, comprising an unlocking and locking mechanism sleeved outside the wire rope, and

[0009] A salvage and delivery mechanism is arranged downstream of the unlocking and locking mechanism, and the salvage and delivery mechanism includes a housing, a pull rod concentrically arranged in the housing, and a pressure cap arranged at the top end of the pull rod and used for fixed connection with the free end of the wire rope,

[0010] The salvage and delivery mechanism further comprises a plurality of clamping arms arranged on the pull rod at intervals along the circumferential direction, and a hook claw for clamping with a salvage head of a drilling instrument is provided at the lower end surface of the clamping arm.

[0011] In one embodiment, the salvage and delivery mechanism also includes a limit assembly arranged at the bottom end of the pull rod, the limit assembly includes a limit seat configured in a disc form and forming a sealing connection with the inner circumferential surface of the shell, a fixed seat extending axially downward from the limit seat and forming a threaded connection with the free end of the pull rod, and a limit groove arranged between the limit seat and the fixed seat along the circumferential direction and allowing the clamping arm to pass through.

[0012] In one embodiment, the clamping arm comprises a first clamping arm portion configured in an arc-shaped structure, and a second clamping arm portion configured in a rod-shaped form and arranged downstream of the first clamping arm portion.

[0013] Wherein, a joint portion extending radially inward and hinged to the limiting seat is formed at the joint between the second clamping arm portion and the first clamping arm portion, and the hook claw is fixed to the free end of the second clamping arm portion.

[0014] In one embodiment, the limiting seat is fixedly connected to the housing by fastening bolts.

[0015] In one embodiment, the unlocking and locking mechanism includes a hammer body, and locking components disposed in the hammer body and symmetrically arranged on both sides of the steel wire rope.

[0016] Wherein, the locking assembly includes a wrench fixed to the inner wall of the hammer body through a fulcrum bolt, a locking slider arranged between the wrench and the steel wire rope, and a spring arranged between the locking slider and the steel wire rope.

[0017] In one embodiment, the wrench includes a fastening portion configured in a cam form and abutting against the locking slider, and an adjusting portion configured in an arc-shaped structure and abutting against the step surface of the wellbore.

[0018] Wherein, the adjusting part is configured to be able to slide outward on the step surface to cause the fastening part to rotate around the fulcrum bolt; and the locking slider moves radially outward under the action of the spring to disengage from the wire rope.

[0019] In one embodiment, a first circular groove adapted to the fastening portion, a guide groove adapted to the adjusting portion, and a second square groove adapted to the locking slide are respectively provided on the inner wall of the hammer body.

[0020] In one embodiment, the unlocking and locking mechanism further includes a cover plate adapted to the hammer body, and through grooves arranged on both sides of the cover plate and used to limit the movement stroke of the adjusting part.

[0021] In one embodiment, a radially inwardly extending constriction groove is formed at the joint between the hammer body and the housing, and the inner diameter of the constriction groove gradually decreases toward the hammer body.

[0022] Wherein, the first clamping arm portion is configured to be able to move upward under the action of the wire rope and shrink into the tie-mouth groove to allow the hook claw to move radially outward to release the fishing head of the drilling instrument.

[0023] According to a second aspect of the present invention, there is provided a method for salvaging and delivering a drilling instrument using the salvaging and delivering device as described above, comprising a salvaging step and a delivering step:

[0024] Salvage step: fixing the salvage delivery mechanism on the wire rope and putting it into the wellbore, and the salvage delivery mechanism descends to the drilling instrument under the action of gravity; the hook claw is connected with the salvage head of the drilling instrument to extract the drilling instrument;

[0025] Release step: the unlocking and locking mechanism and the salvage and release mechanism are arranged on the wire rope at intervals and put into the wellbore, and the unlocking and locking mechanism descends under the action of gravity until the adjustment part of the wrench abuts against the step surface; the unlocking and locking mechanism continues to be lowered to cause the unlocking and locking mechanism to loosen the wire rope; the wire rope is lifted up to allow the first clamping arm part to shrink into the constriction groove, thereby allowing the hook claw to move radially outward to release the salvage head of the drilling instrument.

[0026] Compared with the prior art, the advantages of the present invention are that the present invention can complete the salvage and delivery of the downhole instrument by lowering the unlocking and locking mechanism and the salvage and delivery mechanism through the wire rope, thereby eliminating the need to lift out the drill string of the entire well to replace the downhole instrument, thereby saving time and cost for replacing the downhole instrument and further improving the safety of the drilling rig lifting and lowering the tubing. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be described in detail below with reference to the accompanying drawings, in which:

[0028] Figure 1 The structure of a salvaging and delivering device 100 for a drilling-while-drilling instrument according to the present invention is schematically shown;

[0029] Figure 2 The external structure of the unlocking and locking mechanism 200 in the salvage and delivery device 100 for the drilling instrument according to the present invention is schematically shown;

[0030] Figure 3 The internal structure of the unlocking and locking mechanism 200 in the salvage and delivery device 100 for the drilling instrument according to the present invention is schematically shown;

[0031] Figure 4 for Figure 3 A partial view of

[0032] Figure 5 The partial structure of the salvage and delivery mechanism in the salvage and delivery device 100 for the drilling tool according to the present invention is schematically shown;

[0033] Figure 6 It is a schematic diagram of a limit assembly in a salvage and delivery device 100 for a while-drilling instrument according to the present invention;

[0034] Figure 7 It is an assembly diagram of a salvaging and delivering device 100 for a drilling-while-drilling instrument according to the present invention;

[0035] Figure 8 The diagram shows a delivery process of the fishing and delivering device 100 for a while-drilling instrument according to the present invention.

[0036] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale. DETAILED DESCRIPTION

[0037] In order to make the technical solutions and advantages of the present invention more clearly understood, the exemplary embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than an exhaustive list of all the embodiments. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0038] In the present invention, the directional terms "upstream" or "above" or similar terms refer to the direction close to the wellhead, i.e. Figure 1 The directional terms "downstream" or "below" or similar terms refer to the direction away from the wellhead, i.e. Figure 1 The bottom direction in .

[0039] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0040] In the present invention, unless otherwise clearly stipulated and limited, terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements.

[0041] For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] The present invention will be further described below in conjunction with the accompanying drawings.

[0043] Figure 1 The structure of a salvaging and delivering device 100 for a drilling-while-drilling instrument according to the present invention is schematically shown;

[0044] Figure 2 The external structure of the unlocking and locking mechanism 200 in the salvage and delivery device 100 for the drilling instrument according to the present invention is schematically shown;

[0045] Figure 3 The internal structure of the unlocking and locking mechanism 200 in the salvage and delivery device 100 for the drilling instrument according to the present invention is schematically shown;

[0046] Figure 4 for Figure 3 A partial view of

[0047] Figure 5 The partial structure of the salvage and delivery mechanism in the salvage and delivery device 100 for the drilling tool according to the present invention is schematically shown;

[0048] Figure 6 It is a schematic diagram of a limit assembly in a salvage and delivery device 100 for a while-drilling instrument according to the present invention;

[0049] Figure 7 It is an assembly diagram of a salvaging and delivering device 100 for a drilling-while-drilling instrument according to the present invention;

[0050] Figure 8 The diagram shows a delivery process of the fishing and delivering device 100 for a while-drilling instrument according to the present invention.

[0051] like Figure 1 As shown, according to a first aspect of the present invention, a salvage and delivery device 100 for a drilling instrument is provided, which includes an unlocking and locking mechanism 200 sleeved on the outside of a wire rope 101 , and a salvage and delivery mechanism 300 arranged downstream of the unlocking and locking mechanism 200 .

[0052] According to the present invention, Figure 5 and 7 As shown, the salvage delivery mechanism 300 includes a housing 311 and a pull rod 312 concentrically arranged in the housing 311. The housing 311 is configured as a hollow sleeve structure, and the pull rod 312 is fixed in the housing 311 by a limit assembly (described below), thereby improving the firmness of the pull rod 312 in the housing 311.

[0053] In one embodiment, Figure 5 and 7 As shown, the salvage delivery mechanism 300 also includes a pressure cap 313 disposed at the top end of the pull rod 312. Preferably, the pressure cap 313 is configured to fix the pull rod 312 at the free end of the wire rope 101, thereby ensuring the firmness between the salvage delivery mechanism 300 and the wire rope 101.

[0054] According to the present invention, Figure 5 and 7 As shown, the salvage delivery mechanism 300 further includes a plurality of clamping arms 320 arranged at intervals along the circumferential direction on the pull rod 312. Preferably, a hook 324 is provided at the lower end surface of the clamping arm 320. In the present invention, the hook 324 can form a stable clamping relationship with the salvage head 402 of the drilling instrument, thereby facilitating the purpose of salvaging and delivering the drilling instrument.

[0055] In one embodiment, Figure 5 , 6 As shown in FIG. 7 , the salvage delivery mechanism 300 further includes a limit assembly disposed at the bottom end of the pull rod 312. Preferably, the clamping arm 320 can be installed in the limit assembly and can clamp and release the salvage head 402 of the drilling tool in the housing 311, the contents of which are described below.

[0056] In one embodiment, Figure 5 , 6 As shown in Figures 7 and 8, the limiting assembly includes a limiting seat 331 configured in a disc form. Preferably, the limiting seat 331 forms a sealed connection with the inner circumferential surface of the housing 311, and the limiting seat 331 is also fixedly connected to the housing 311 by a fastening bolt (not shown), so as to provide a stable working environment for the pull rod 312 in the housing 311. As a result, the limiting seat 331 can always have a stable connection relationship with the housing 311 during the process of salvaging and delivering.

[0057] In one embodiment, Figure 5 , 6 As shown in FIG. 7 , the limit assembly further includes a fixing seat 332 extending axially downward from the limit seat 331. Preferably, the fixing seat 332 can be threadedly connected with the free end of the pull rod 312 to ensure that the limit assembly can be securely mounted on the pull rod 312.

[0058] In one embodiment, the limiting assembly further includes limiting grooves 333 arranged at intervals along the circumferential direction between the limiting seat 331 and the fixing seat 332. Preferably, the limiting grooves 333 are configured to allow the clamping arm 320 to pass through, and the joint 323 (described below) of the clamping arm 320 can be hinged on the fixing seat 332 by rotating the bolt 334, thereby ensuring that the clamping arm 320 can rotate at a certain angle.

[0059] According to the present invention, Figure 5 As shown, the clamping arm 320 includes a first clamping arm portion 321 configured as an arc structure, and a second clamping arm portion 322 configured as a rod-shaped form and arranged downstream of the first clamping arm portion 321. A joint portion 323 extending radially inward is formed at the joint between the second clamping arm portion 322 and the first clamping arm portion 321. Preferably, the clamping arm 320 is configured to be hinged on the limit seat 331 through the joint portion 323.

[0060] In one embodiment, Figure 5 As shown, the hook claw 324 is fixed to the free end of the second clamping arm portion 322. In this way, the hook claw 324 can smoothly grab the fishing head 402 of the drilling tool to form a clamping relationship, thereby ensuring that the fishing and delivering mechanism 300 can smoothly lift the drilling tool out of the wellbore 400, so as to facilitate replacement and maintenance work.

[0061] When it is necessary to replace the drilling instrument in the wellbore 400, the salvage and delivery mechanism 300 needs to be fixed at the bottom end of the wire rope 101 and put into the wellbore 400. The salvage and delivery mechanism 300 will descend to the vicinity of the drilling instrument under the action of its own gravity, and then the hook claw 324 will form a clamping connection with the salvage head 402 of the drilling instrument under the action of inertia, and finally the drilling instrument will be taken out by lifting it up.

[0062] It is easy to understand that in the above process of the present invention, the unlocking and locking mechanism 200 can be selectively installed as needed.

[0063] According to the present invention, Figure 2As shown, the unlocking and locking mechanism 200 includes a hammer 210 and a locking assembly disposed in the hammer 210. Preferably, the locking assemblies are symmetrically arranged on both sides of the wire rope 101, so as to clamp the wire rope 101, so as to achieve the purpose of limiting the position of the unlocking and locking mechanism 200 and the salvage and delivery mechanism 300 on the wire rope 101.

[0064] In a specific embodiment, Figure 3 As shown, the locking assembly includes a wrench 220 fixed to the inner wall 211 of the hammer body 210 through a fulcrum bolt 231, a locking slider 232 arranged between the wrench 220 and the wire rope 101, and a spring 233 arranged between the locking slider 232 and the wire rope 101.

[0065] Preferably, if Figure 3 As shown, the wrench 220 includes a fastening portion 221 configured in the form of a cam abutting against the locking slider 232. Therefore, after the unlocking and locking mechanism 200 is installed, the fastening portion 221 of the wrench 220 can apply a pressing force on the locking slider 232 to force the locking slider 232 to press the wire rope 101, thereby limiting the position of the unlocking and locking mechanism 200 on the wire rope 101.

[0066] In addition, when the locking slider 232 is squeezed, the spring 233 is in a contracted state to store energy, thereby prompting the locking slider 232 to return to its original position when the fastening portion 221 does not apply force, thereby achieving the purpose of loosening the wire rope 101.

[0067] In one embodiment, Figure 3 As shown, the wrench 220 also includes an adjusting portion 222 fixed at the lower end surface of the fastening portion 221. Preferably, the adjusting portion 222 is configured as an arc structure, and can limit the rotation of the fastening portion 221 in the initial state, thereby ensuring that the unlocking and locking mechanism 200 can be fixed on the wire rope 101 during the lowering process. Preferably, during the lowering process, the adjusting portion 222 of the wrench 220 can abut against the step surface 401 of the wellbore 400.

[0068] According to a specific embodiment of the present invention, the adjusting portion 222 of the wrench 220 is configured to slide outward on the step surface 401 to cause the fastening portion 221 to rotate around the fulcrum bolt 231, thereby releasing the extrusion force on the locking slider 232, and the locking slider 232 moves radially outward under the action of the spring 233 to disengage from the wire rope 101. In this state, the wire rope 101 can be manually lifted to change the axial position of the salvage and delivery mechanism 300 in the wellbore 400.

[0069] In one embodiment, Figure 3 and 4As shown, a radially inwardly extending cinch groove 250 is formed at the joint between the hammer body 210 and the housing 311, and the inner diameter of the cinch groove 250 gradually decreases toward the hammer body 210. Preferably, after the wire rope 101 is lifted, the clamping arm 320 moves upward under the action of the wire rope 101, and the first clamping arm portion 321 can be retracted into the cinch groove 250 to allow the hook claw 324 to move radially outward to release the fishing head 402 of the drilling tool.

[0070] During the delivery process, the unlocking and locking mechanism 200 and the salvage and delivery mechanism 300 need to be arranged at intervals on the wire rope 101, and the salvage joint 402 of the new downhole instrument is clamped by the claw 324. The unlocking and locking mechanism 200 and the salvage and delivery mechanism 300 move downward under the action of gravity until the adjusting part 222 of the wrench 220 abuts against the step surface 401 of the wellbore 400.

[0071] The unlocking and locking mechanism 200 and the salvaging and releasing mechanism 300 continue to be lowered under the action of inertia, and the adjusting part 222 of the wrench 220 slides outward on the step surface 401 to cause the fastening part 221 of the wrench 220 to rotate around the fulcrum bolt 231 to release the squeezing force on the locking slider 232. The locking slider 232 moves radially outward under the action of the spring 233 to disengage from the wire rope 101.

[0072] The salvage and delivery mechanism 300 is moved upward and combined with the tie slot 250 by lifting the wire rope 101. At the same time, the first clamping arm portion 321 of the clamping arm 320 is retracted into the tie slot 250, thereby allowing the claw 324 on the second clamping arm portion 322 to move radially outward to release the salvage head 402 of the drilling instrument.

[0073] After that, on the one hand, the drilling instrument will automatically slide into the dovetail groove (not shown) below under the action of its own weight to achieve the purpose of keying; on the other hand, the salvage and delivery device 100 for the drilling instrument can be lifted out by a winch (not shown) for reuse.

[0074] In one embodiment, Figure 4 As shown, a first circular groove 212 adapted to the fastening portion 221, a guide groove 213 adapted to the adjusting portion 222, and a second square groove 214 adapted to the locking slider 232 are respectively provided on the inner wall 211 of the hammer body 210. In this way, the wrench 220 and the locking slider 232 can smoothly complete the corresponding actions to achieve the purpose of disengaging the wire rope 101.

[0075] In one embodiment, Figure 2As shown, the unlocking and locking mechanism 200 further includes a cover plate 240 adapted to the hammer body 210, and through grooves disposed on both sides of the cover plate 240 and used to limit the movement stroke of the adjusting portion 222. In this way, on the one hand, the cover plate 240 can provide good protection for the various components in the hammer body 210, and on the other hand, the through grooves can effectively limit the adjusting portion 222 of the wrench 220, so as to ensure that the adjusting portion 222 can perform underground operations according to a predetermined movement path.

[0076] According to a second aspect of the present invention, there is provided a method for salvaging and delivering a drilling instrument using the salvaging and delivering device as described above, comprising a salvaging step and a delivering step:

[0077] The salvage process of the present invention is described below:

[0078] First, the salvage and delivery mechanism 300 is fixed on the wire rope 101 and put into the wellbore 400. The salvage and delivery mechanism 300 descends to the drilling tool under the action of gravity.

[0079] Then, after the hook claw 324 is engaged with the fishing head 402 of the drilling tool, the wire rope 101 is pulled up to remove the drilling tool.

[0080] Combination Figure 8 The delivery process of the present invention is introduced:

[0081] First, the unlocking and locking mechanism 200 and the salvage and delivery mechanism 300 are arranged on the wire rope 101 at intervals; the salvage head 402 of a new drilling tool is clamped by the hook 324 and put into the wellbore 400.

[0082] Then, the unlocking and locking mechanism 200 moves downward under the action of gravity until the adjusting portion 222 of the wrench 220 abuts against the step surface 401 of the wellbore 400 .

[0083] Afterwards, the unlocking and locking mechanism 200 and the salvaging and releasing mechanism 300 continue to be lowered under the action of inertia, and the adjusting part 222 of the wrench 220 slides outward on the step surface 401 to cause the fastening part 221 of the wrench 220 to rotate around the fulcrum bolt 231 to release the squeezing force on the locking slider 232. The locking slider 232 moves radially outward under the action of the spring 233 to disengage from the wire rope 101.

[0084] Finally, the salvage and delivery mechanism 300 moves upward and combines with the tie slot 250 by lifting the wire rope 101. At the same time, the first clamping arm portion 321 of the clamping arm 320 shrinks into the tie slot 250, thereby allowing the claw 324 on the second clamping arm portion 322 to move radially outward to release the salvage head 402 of the drilling instrument.

[0085] Afterwards, the new drilling instrument will automatically slide into the dovetail groove (not shown) below under the action of its own weight to achieve the purpose of keying; the salvaging and delivery device 100 for the drilling instrument will also be lifted out by a winch (not shown) for reuse.

[0086] It is noteworthy that the entire salvage and delivery process of the present invention is simple and rapid, and the drilling instrument can be replaced without using a drilling rig to pull out the entire drill pipe in the well, thereby significantly saving time and drilling costs and improving the safety of the drilling rig pulling out the pipe string.

[0087] Compared with the prior art, the advantages of the present invention are as follows: the present invention can complete the salvage and delivery of the downhole instrument by lowering the unlocking and locking mechanism 200 and the salvage and delivery mechanism 300 through the wire rope 101, thereby eliminating the need to lift out the drill string of the entire well to replace the downhole instrument, thereby saving time and cost for replacing the downhole instrument and further improving the safety of the drilling rig lifting and lowering the tubing.

[0088] The above are only preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art can easily make changes or modifications within the disclosure scope of the present invention, and such changes or modifications should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A salvage and delivery device for a drilling instrument, comprising: an unlocking and locking mechanism (200) sleeved on the outside of the steel wire rope (101), and A salvaging and releasing mechanism (300) is arranged downstream of the unlocking and locking mechanism (200), the salvaging and releasing mechanism (300) comprising a housing (311), a pull rod (312) arranged concentrically in the housing (311), and a pressure cap (313) arranged at the top end of the pull rod (312) and used for fixedly connecting with the free end of the steel wire rope (101), The salvage and delivery mechanism (300) further comprises a plurality of clamping arms (320) arranged at intervals along the circumferential direction on the pull rod (312), and a hook claw (324) for forming a clamping connection with a salvage head (402) of a drilling instrument is provided at the lower end surface of the clamping arm (320).

2. The salvage and delivery device for drilling instruments according to claim 1, characterized in that: The salvaging and releasing mechanism (300) also includes a limiting assembly arranged at the bottom end of the pull rod (312), the limiting assembly including a disc-shaped limiting seat (331) that forms a sealing connection with the inner circumferential surface of the shell (311), a fixing seat (332) that extends axially downward from the limiting seat (331) and forms a threaded connection with the free end of the pull rod (312), and a limiting groove (333) that is arranged between the limiting seat (331) and the fixing seat (332) along the circumferential direction and allows the clamping arm (320) to pass through.

3. The salvage and delivery device for drilling instruments according to claim 2, characterized in that: The clamping arm (320) includes a first clamping arm portion (321) configured in an arc-shaped structure, and a second clamping arm portion (322) configured in a rod-shaped form and arranged downstream of the first clamping arm portion (321). Wherein, a joint portion (323) extending radially inward and hinged on the limiting seat (331) is formed at the joint between the second clamping arm portion (322) and the first clamping arm portion (321), and the hook claw (324) is fixed to the free end of the second clamping arm portion (322).

4. The salvage and delivery device for drilling instruments according to claim 3, characterized in that: The limiting seat (331) is fixedly connected to the housing (311) via fastening bolts.

5. The salvage and delivery device for drilling instruments according to claim 3 or 4, characterized in that: The unlocking and locking mechanism (200) comprises a hammer (210), and locking components disposed in the hammer (210) and symmetrically arranged on both sides of the steel wire rope (101). The locking assembly comprises a wrench (220) fixed to an inner wall (211) of a hammer body (210) by a fulcrum bolt (231), a locking slider (232) arranged between the wrench (220) and the steel wire rope (101), and a spring (233) arranged between the locking slider (232) and the steel wire rope (101).

6. The salvage and delivery device for drilling instruments according to claim 5, characterized in that: The wrench (220) comprises a fastening portion (221) configured in a cam form and abutting against the locking slider (232), and an adjusting portion (222) configured in an arc-shaped structure and abutting against a step surface (401) of a wellbore (400). The adjusting portion (222) is configured to be able to slide outward on the step surface (401) to cause the fastening portion (221) to rotate around the fulcrum bolt (231); and the locking slider (232) moves radially outward under the action of the spring (233) to disengage from the steel wire rope (101).

7. The salvage and delivery device for drilling instruments according to claim 6, characterized in that: A first circular groove (212) adapted to the fastening portion (221), a guide groove (213) adapted to the adjusting portion (222), and a second square groove (214) adapted to the locking slide block (232) are respectively provided on the inner wall (211) of the hammer body (210).

8. The salvage and delivery device for drilling instruments according to claim 7, characterized in that: The unlocking and locking mechanism (200) further comprises a cover plate (240) adapted to the hammer body (210), and through grooves arranged on both sides of the cover plate (240) and used to limit the movement stroke of the adjusting part (222).

9. The salvage and delivery device for drilling instruments according to claim 8, characterized in that: A constriction groove (250) extending radially inward is formed at the joint between the hammer body (210) and the housing (311), and the inner diameter of the constriction groove (250) gradually decreases toward the hammer body (210). The first clamping arm portion (321) is configured to move upward and retract into the tie-mouth groove (250) under the action of the wire rope (101) to allow the hook claw (324) to move radially outward to release the fishing head (402) of the drilling instrument.

10. A method for salvaging and delivering a drilling instrument using the salvaging and delivering device according to any one of claims 1 to 9, comprising a salvaging step and a delivering step: Salvage step: fixing the salvage delivery mechanism (300) on the steel wire rope (101) and putting it into the wellbore (400), and the salvage delivery mechanism (300) descends to the drilling instrument under the action of gravity; the hook (324) is connected with the salvage head (402) of the drilling instrument to extract the drilling instrument; The releasing and delivering step includes: arranging the unlocking and locking mechanism (200) and the salvaging and delivering mechanism (300) on the steel wire rope (101) at intervals and putting them into the wellbore (400); the unlocking and locking mechanism (200) moves downward under the action of gravity until the adjusting part (222) of the wrench (220) contacts the step surface (401); continuing to lower the unlocking and locking mechanism (200) to release the steel wire rope (101); lifting the steel wire rope (101) to allow the first clamping arm part (321) to shrink into the constriction groove (250), thereby allowing the hook claw (324) to move radially outward to release the salvaging head (402) of the drilling instrument.

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