Tool for lowering and recovering guider

Abstract

The tool comprises an upper shaft, a lower shaft and elastic claws, the top end of the lower shaft is connected with the bottom end of the upper shaft through threads, and the interior of the upper shaft is communicated with the interior of the lower shaft; the elastic claw comprises a sleeve part and a claw part, the claw part comprises a plurality of arc-shaped pieces, an arc-shaped clamping head is arranged at the bottom end of each arc-shaped piece, the arc-shaped pieces are annularly arranged into a circle along the edge of the bottom end of the sleeve part, and the arc-shaped clamping heads at the bottom ends of the arc-shaped pieces annularly define a ring body with the adjustable outer diameter. Wherein the outer diameter of the ring body with the adjustable outer diameter can be adjusted to be increased or decreased by changing the size of a gap between adjacent arc-shaped clamping heads; the sleeve part of the elastic claw is arranged on the outer wall of the lower middle portion of the lower shaft in a sleeving mode, and the sleeve part of the elastic claw communicates with the interior of the lower shaft.

Description

Technical Field

[0001] The present invention relates to the technical field of downhole operation equipment, and in particular to a guide running and recovery tool. Background Art

[0002] During downhole operations, accurate placement and efficient retrieval of guides are crucial for the smooth running of the entire process. Existing guide running and retrieval tools have numerous shortcomings, such as poor anchoring and complex and unstable locking and unlocking operations for pressure control. These issues result in low downhole operation efficiency and pose safety risks.

[0003] In summary, existing guide running and retrieval tools have poor reliability in locking and unlocking and cannot guarantee high efficiency. Summary of the Invention

[0004] In view of the above problems, the purpose of the present invention is to provide a guide running and recovery tool to solve the problem that the existing guide running and recovery tools have poor locking and unlocking reliability and cannot ensure high efficiency.

[0005] To achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present invention discloses a guide running and recovery tool, comprising Up the well, A lower shaft, the top end of which is connected to the bottom end of the upper shaft by a thread, and the interior of the upper shaft is connected to the interior of the lower shaft; The elastic claw comprises a sleeve portion and a claw portion, the claw portion comprises a plurality of arc-shaped pieces, the bottom end of each arc-shaped piece is provided with an arc-shaped clamping head, the plurality of arc-shaped pieces are circumferentially arranged in a circle along the edge of the bottom end of the sleeve portion, and the arc-shaped clamping heads at the bottom ends of the plurality of arc-shaped pieces are circumferentially surrounded by a ring body with adjustable outer diameter, wherein the ring body with adjustable outer diameter realizes the adjustment of the outer diameter of the ring body by changing the gap size between adjacent arc-shaped clamping heads; the sleeve portion of the elastic claw is sleeved on the outer wall of the middle and lower part of the lower wellbore, and the sleeve portion of the elastic claw is communicated with the interior of the lower wellbore.

[0006] Preferably, the guide comprises a guide outer sleeve, and the inner wall of the upper end of the guide outer sleeve is provided with a ring body groove. When the guide is lowered and the recovery tool is extended into the interior of the guide outer sleeve, the claw portion of the elastic claw is squeezed by the inner wall of the guide outer sleeve, and the gap between adjacent arc-shaped clamps becomes smaller, thereby making the outer diameter of the ring body with adjustable outer diameter smaller, until the ring body with adjustable outer diameter moves into the ring body groove at the upper end of the guide outer sleeve, thereby realizing the outer diameter of the guide The inner wall of the upper end of the sleeve is sleeved with the claw portion of the elastic claw and locked; when fluid is introduced into the interior of the upper wellbore, the fluid flows into the interior of the sleeve portion of the elastic claw through the interior of the lower wellbore, squeezing the inner wall of the sleeve portion of the elastic claw outward, forcing the claw portion of the elastic claw to move outward, thereby driving the arc-shaped clamping head of each arc-shaped piece to move upward until the ring body with adjustable outer diameter is disengaged from the ring body clamping groove at the upper end of the guide outer sleeve, thereby realizing the unlocking of the guide lowering and recovery tool and the guide outer sleeve.

[0007] Preferably, a first channel is provided inside the upper wellbore, and a second channel is provided inside the lower wellbore. When the top end of the lower wellbore and the bottom end of the upper wellbore are connected together by threads, the first channel is communicated with the second channel; the sleeve portion of the elastic claw is provided with an annular groove, and a plurality of pressure transmission holes are provided through the wall of the lower wellbore. When the sleeve portion of the elastic claw is sleeved on the outer wall of the middle and lower part of the lower wellbore, the interior of the lower wellbore and the annular groove of the elastic claw are communicated through the pressure transmission holes.

[0008] Preferably, a nozzle is provided at the bottom end of the lower shaft, and the nozzle is connected to the second channel of the lower shaft.

[0009] Preferably, the connection between the lower wellbore and the upper wellbore is fixedly connected by a pin.

[0010] Preferably, a return spring groove is provided on the inner wall of the lower end of the upper wellbore, a return spring is sleeved on the outer wall of the top end of the lower wellbore, and the return spring is located in the return spring groove at the lower end of the upper wellbore.

[0011] Preferably, the top end of the outer sleeve of the guide is configured as an inclined surface.

[0012] Preferably, the lower wellbore is provided with a threaded section, a reset spring section, a sleeve portion docking section of the elastic claw, a claw portion socket section of the elastic claw and a nozzle section in sequence from top to bottom, wherein an external thread is provided on the outer wall of the threaded section for threaded connection of the lower wellbore with the upper wellbore; the reset spring section is used to set the reset spring; the sleeve portion docking section of the elastic claw is used to set the sleeve portion of the elastic claw; the claw portion socket section of the elastic claw is used to set the claw portion of the elastic claw; the bottom end of the nozzle section is used to set the nozzle.

[0013] Preferably, an annular step is provided at the junction of the sleeve section of the claw portion of the elastic claw and the nozzle section, and the outer wall of the sleeve section of the claw portion of the elastic claw close to the annular step expands outward to form an expansion section; the outer diameter of the upper end of the sleeve section of the claw portion of the elastic claw is equal to the outer diameter of the lower end of the sleeve section of the elastic claw, forming a straight section; the straight section and the expansion section are connected by an inclined section; when the sleeve section of the elastic claw is sleeved on the middle and lower part of the lower wellbore, the outer diameter of the upper end of the sleeve section ... When the outer wall is on the outer wall, the arc-shaped clamps at the bottom ends of the multiple arc-shaped pieces of the claw part of the elastic claw are tightly pressed against the expansion section to form a ring body with adjustable outer diameter; when the ring body with adjustable outer diameter is disengaged from the ring body clamping groove at the upper end of the guide outer sleeve, the arc-shaped clamps at the bottom ends of the multiple arc-shaped pieces slide from the expansion section through the inclined section to the straight section, and the ring body with adjustable outer diameter is disengaged from the ring body clamping groove at the upper end of the guide outer sleeve, thereby realizing the unlocking of the guide lowering and recovery tool and the guide outer sleeve.

[0014] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention discloses a guide lowering and recovery tool, comprising an upper wellbore, a lower wellbore, and an elastic claw, wherein the top end of the lower wellbore is connected to the bottom end of the upper wellbore by a threaded connection, and the interior of the upper wellbore is connected to the interior of the lower wellbore; the elastic claw comprises a sleeve portion and a claw portion, wherein the claw portion comprises a plurality of arcuate pieces, each arcuate piece having an arcuate clamping head at the bottom end thereof, the plurality of arcuate pieces being arranged in a circle along the bottom edge of the sleeve portion, and the arcuate clamping heads at the bottom ends of the plurality of arcuate pieces forming a ring body with an adjustable outer diameter, wherein the ring body with an adjustable outer diameter can adjust the outer diameter of the ring body by changing the gap size between adjacent arcuate clamping heads; the sleeve portion of the elastic claw is sleeved on the outer wall of the middle and lower part of the lower wellbore, and the sleeve portion of the elastic claw is connected to the interior of the lower wellbore. The guide comprises a guide outer sleeve, wherein the inner wall of the upper end of the guide outer sleeve is provided with a ring body clamping groove. When the guide is lowered and the recovery tool is extended into the interior of the guide outer sleeve, the claw portion of the elastic claw is squeezed by the inner wall of the guide outer sleeve, and the gap between adjacent arc-shaped clamps becomes smaller, thereby making the outer diameter of the ring body with adjustable outer diameter smaller until the ring body with adjustable outer diameter moves into the ring body clamping groove at the upper end of the guide outer sleeve, thereby realizing that the inner wall of the upper end of the guide outer sleeve is sleeved with the claw portion of the elastic claw and locked; when fluid is passed into the interior of the upward wellbore, the fluid flows into the sleeve portion of the elastic claw through the interior of the lower wellbore, squeezing the inner wall of the sleeve portion of the elastic claw outward, forcing the claw portion of the elastic claw to move outward, and then driving the arc clamp of each arc piece to move upward until the ring body with adjustable outer diameter is disengaged from the ring body clamping groove at the upper end of the guide outer sleeve, realizing the unlocking of the guide lowering and recovery tool and the guide outer sleeve. The guide running and recovery tool disclosed in the present invention achieves locking and unlocking of the elastic claws by changing the liquid displacement to generate a pressure difference, thereby realizing the connection and disconnection of the guide running and recovery tool and the guide, providing a more reliable and efficient guide operating tool, and ultimately solving the problem of poor locking and unlocking reliability and inability to guarantee high efficiency of the existing guide running and recovery tools. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a longitudinal cross-sectional view of the guide running and retrieval tool provided in Example 1 of the present invention; Figure 2 yes Figure 1 Schematic diagram of the overall structure after the guide is lowered into the recovery tool and docked with the guide; Figure 3 yes Figure 2 A local enlarged view of point A in FIG; Figure 4 yes Figure 3 A local enlarged view of point B in FIG; Figure 5yes Figure 4 A local enlarged view of point C in FIG; Figure 6 is a longitudinal cross-sectional view of the lower shaft provided by Example 1 of the present invention; Figure 7 is a schematic structural diagram of the elastic claw provided in Example 1 of the present invention; Figure 8 It is a structural schematic diagram of the upper end of the outer sleeve of the guide provided in Example 1 of the present invention.

[0016] Description of reference numerals: 100 - outer sleeve of guide, 101 - inclined surface, 102 - groove of ring body; 1-upper shaft, 10-first channel, 11-pin; 2-lower shaft, 20-second channel, 21-annular step, 22-expansion section, 23-straight section, 24-inclined section; 3-elastic claw, 300-annular groove, 30-pressure transmission hole, 31-sleeve part, 32-claw part, 320-arc-shaped piece, 33-arc-shaped clamp; 4-Return spring; 5- Nozzle. DETAILED DESCRIPTION

[0017] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0018] Example 1: A guide running and recovery tool Embodiment 1 of the present invention provides a guide running and recovery tool, and its structure is described in detail below with reference to the accompanying drawings.

[0019] refer to Figures 1 to 8 The guide running recovery tool is used to run in and recover the guide. The guide running recovery tool includes an upper wellbore 1, a lower wellbore 2 and an elastic claw 3.

[0020] The top of the lower shaft 2 is threadedly connected to the bottom of the upper shaft 1, and the interior of the upper shaft 1 is connected to the interior of the lower shaft 2. To prevent the threads connecting the top of the lower shaft 2 and the bottom of the upper shaft 1 from reversing and falling off, the connection between the lower shaft 2 and the upper shaft 1 is fixed by a pin 11. Specifically, the upper shaft 1 is penetrated by a pin hole, and the pin 11 passes through the pin hole and is fixed to the wall of the lower shaft 2.

[0021] The elastic claw 3 includes a sleeve portion 31 and a claw portion 32, and the claw portion 32 includes a plurality of arc-shaped pieces 320, and an arc-shaped clamping head 33 is provided at the bottom end of each arc-shaped piece 320. The plurality of arc-shaped pieces 320 are arranged in a circle along the bottom edge of the sleeve portion 31, and the arc-shaped clamping heads 33 at the bottom ends of the plurality of arc-shaped pieces 320 are circumferentially surrounded to form a ring body with adjustable outer diameter, wherein the ring body with adjustable outer diameter realizes the adjustment of the outer diameter of the ring body by changing the gap size between adjacent arc-shaped clamping heads 33; the sleeve portion 31 of the elastic claw 3 is sleeved on the outer wall of the middle and lower part of the lower wellbore 2, and the sleeve portion 31 of the elastic claw 3 is communicated with the interior of the lower wellbore 2.

[0022] The guide includes a guide outer sleeve 100 , and an annular groove 102 is provided on the inner wall of the upper end of the guide outer sleeve 100 .

[0023] When the guide is lowered and the recovery tool is inserted into the interior of the guide outer sleeve 100, the claw portion 32 of the elastic claw 3 is squeezed by the inner wall of the guide outer sleeve 100, and the gap between adjacent arc-shaped clamps 33 becomes smaller, thereby reducing the outer diameter of the ring body with adjustable outer diameter until the ring body with adjustable outer diameter moves into the ring body clamping groove 102 at the upper end of the guide outer sleeve 100, thereby achieving the inner wall of the upper end of the guide outer sleeve 100 to sleeve the claw portion 32 of the elastic claw 3 and lock it; When fluid is introduced into the interior of the upward wellbore 1, the fluid flows into the interior of the sleeve portion 31 of the elastic claw 3 through the interior of the lower wellbore 2, squeezing the inner wall of the sleeve portion 31 of the elastic claw 3 outward, forcing the claw portion 32 of the elastic claw 3 to move outward, thereby driving the arc-shaped clamping head 33 of each arc-shaped piece 320 to move upward until the ring body with adjustable outer diameter is disengaged from the ring body clamping groove 102 at the upper end of the guide outer sleeve 100, thereby unlocking the guide lowering and recovery tool and the guide outer sleeve 100.

[0024] As a specific embodiment, a first channel 10 is provided inside the upper wellbore 1, and a second channel 20 is provided inside the lower wellbore 2. When the top end of the lower wellbore 2 is connected to the bottom end of the upper wellbore 1 by threads, the first channel 10 is communicated with the second channel 20; the sleeve portion 31 of the elastic claw 3 is provided with an annular groove 300, and two pressure transmission holes 30 are provided through the wall of the lower wellbore 2, and the two pressure transmission holes 30 are symmetrically arranged between the annular groove 300 and the second channel 20 along the longitudinal center line of the lower wellbore 2.

[0025] When the sleeve portion 31 of the elastic claw 3 is sleeved on the outer wall of the middle and lower part of the lower shaft 2 , the interior of the lower shaft 2 and the annular groove 300 of the elastic claw 3 are communicated through the pressure transmission hole 30 .

[0026] In order to facilitate the smooth ejection of the fluid in the second channel 20 , a nozzle 5 is provided at the bottom end of the lower shaft 2 , and the nozzle 5 is connected to the second channel 20 of the lower shaft 2 .

[0027] As is common knowledge, the inner diameter of the nozzle 5 must be smaller than the inner diameter of the bottom end of the lower shaft 2 so that pressure can be applied to the pressure transmission hole 30 when pressure is applied from the upper end.

[0028] Specifically, a spray cavity is provided in the end face of the lower shaft 2, and the nozzle 5 is provided in the spray cavity and is connected to the lower shaft 2 through a threaded connection, so as to provide a spray auxiliary function for subsequent operations.

[0029] Specifically, the outlet end of the nozzle 5 is a detachable structure, which is convenient for replacing different types of nozzles 5 according to different operation requirements, such as a diffusion nozzle or a straight nozzle.

[0030] To ensure that the elastic claw 3 is stable during upward or downward movement, a return spring groove is provided on the inner wall of the lower end of the upper shaft 1, and a return spring 4 is sleeved on the outer wall of the top end of the lower shaft 2, and the return spring 4 is located in the return spring groove at the lower end of the upper shaft 1. The return spring 4, relying on the pre-compressed elastic force, applies a downward preload force to the elastic claw 3, maintaining initial stability.

[0031] Among them, the return spring 4 adopts a pre-compression design, and the pre-compression amount is 10%-20% of the free length of the return spring 4, ensuring that a certain pre-tightening force can be provided to the elastic claw 3 in the initial state to prevent the elastic claw 3 from accidentally sliding when there is no hydraulic action.

[0032] In order to facilitate the lowering of the guide and guide the recovery tool to slide into the guide outer sleeve 100 , the top end of the guide outer sleeve 100 is configured as an inclined surface 101 .

[0033] As a specific implementation, the lower shaft 2 is provided with a threaded section, a return spring section, a sleeve portion docking section of the elastic claw, a claw portion socket section of the elastic claw and a nozzle section in sequence from top to bottom.

[0034] Wherein, an external thread is provided on the outer wall of the threaded section, which is used to connect the lower wellbore 2 and the upper wellbore 1 through threads.

[0035] The return spring segment is used to set the return spring 4.

[0036] The sleeve portion docking section of the elastic claw is used to set the sleeve portion 31 of the elastic claw 3.

[0037] The claw portion sleeve section of the elastic claw is used to set the claw portion 32 of the elastic claw 3.

[0038] The bottom end of the nozzle section is used to set the nozzle 5.

[0039] Preferably, the lower shaft 2 has at least two sections with different inner diameters along its longitudinal direction, and the difference in inner diameters between adjacent sections is greater than 15 mm.

[0040] As a specific embodiment, an annular step 21 is provided at the junction of the claw portion sleeve section of the elastic claw and the nozzle section, and the outer wall of the claw portion sleeve section of the elastic claw close to the annular step 21 expands outward to form an expansion section 22; The outer diameter of the upper end of the sleeve section of the claw portion of the elastic claw is equal to the outer diameter of the lower end of the docking section of the sleeve portion of the elastic claw, forming a straight section 23; The straight section 23 and the expansion section 22 are connected via a slope section 24; When the sleeve portion 31 of the elastic claw 3 is sleeved on the outer wall of the middle and lower part of the lower shaft 2, the arc-shaped clamping head 33 at the bottom end of the multiple arc-shaped pieces 320 of the claw portion 32 of the elastic claw 3 is closely attached to the expansion section 22 to form a ring body with an adjustable outer diameter; When the ring body with adjustable outer diameter is disengaged from the ring body groove 102 at the upper end of the guide outer sleeve 100, the arc-shaped clamping head 33 at the bottom end of the multiple arc-shaped pieces 320 slides from the expansion section 22 through the inclined section 24 to the straight section 23, and the ring body with adjustable outer diameter is disengaged from the ring body groove 102 at the upper end of the guide outer sleeve 100, thereby realizing the unlocking of the guide lowering and recovery tool and the guide outer sleeve 100.

[0041] Specifically, a seal is provided between the lower shaft 2 and the elastic claw 3. The seal is a rubber seal ring that is resistant to high temperature and high pressure to prevent liquid leakage during pressure operation.

[0042] 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 make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A guide running and recovery tool, characterized in that: include Upper shaft (1), A lower wellbore (2), the top end of which is connected to the bottom end of the upper wellbore (1) via a thread, and the interior of the upper wellbore (1) is connected to the interior of the lower wellbore (2); The elastic claw (3) comprises a sleeve portion (31) and a claw portion (32), wherein the claw portion (32) comprises a plurality of arc-shaped pieces (320), wherein the bottom end of each arc-shaped piece (320) is provided with an arc-shaped clamping head (33), wherein the plurality of arc-shaped pieces (320) are circumferentially arranged in a circle along the bottom edge of the sleeve portion (31), and the arc-shaped clamping heads (33) at the bottom ends of the plurality of arc-shaped pieces (320) circumferentially form a ring body with an adjustable outer diameter, wherein the ring body with an adjustable outer diameter is adjusted to increase or decrease the outer diameter of the ring body by changing the size of the gap between adjacent arc-shaped clamping heads (33); the sleeve portion (31) of the elastic claw (3) is sleeved on the outer wall of the middle and lower part of the lower wellbore (2), and the sleeve portion (31) of the elastic claw (3) is communicated with the interior of the lower wellbore (2).

2. The guide running and retrieval tool according to claim 1, characterized in that: The guide comprises a guide outer sleeve (100), and an annular groove (102) is provided on the inner wall of the upper end of the guide outer sleeve (100). When the guide is lowered and the recovery tool is extended into the interior of the guide outer sleeve (100), the claw portion (32) of the elastic claw (3) is squeezed by the inner wall of the guide outer sleeve (100), and the gap between adjacent arc-shaped clamps (33) becomes smaller, thereby reducing the outer diameter of the ring body with adjustable outer diameter until the ring body with adjustable outer diameter moves into the ring body clamping groove (102) at the upper end of the guide outer sleeve (100), thereby achieving the inner wall of the upper end of the guide outer sleeve (100) being sleeved with the claw portion (32) of the elastic claw (3) and locked; When fluid is introduced into the interior of the upper wellbore (1), the fluid flows into the interior of the sleeve portion (31) of the elastic claw (3) through the interior of the lower wellbore (2), and presses the inner wall of the sleeve portion (31) of the elastic claw (3) outward, forcing the claw portion (32) of the elastic claw (3) to move outward, thereby driving the arc-shaped clamping head (33) of each arc-shaped piece (320) to move upward until the ring body with adjustable outer diameter is disengaged from the ring body clamping groove (102) at the upper end of the guide outer sleeve (100), thereby unlocking the guide running and recovery tool from the guide outer sleeve (100).

3. The guide running and retrieval tool according to claim 2, characterized in that: A first channel (10) is provided inside the upper wellbore (1), and a second channel (20) is provided inside the lower wellbore (2); when the top end of the lower wellbore (2) and the bottom end of the upper wellbore (1) are connected together by threads, the first channel (10) and the second channel (20) are connected; The sleeve portion (31) of the elastic claw (3) is provided with an annular groove (300), and a plurality of pressure transmission holes (30) are provided through the wall of the lower wellbore (2). When the sleeve portion (31) of the elastic claw (3) is sleeved on the outer wall of the middle and lower part of the lower wellbore (2), the interior of the lower wellbore (2) and the annular groove (300) of the elastic claw (3) are connected through the pressure transmission holes (30).

4. The guide running and retrieval tool according to claim 3, characterized in that: A nozzle (5) is provided at the bottom end of the lower shaft (2), and the nozzle (5) is connected to the second channel (20) of the lower shaft (2).

5. The guide running and retrieval tool according to claim 1, characterized in that: The connection between the lower wellbore (2) and the upper wellbore (1) is fixedly connected via a pin (11).

6. The guide running and retrieval tool according to claim 4, characterized in that: A return spring groove is provided on the inner wall of the lower end of the upper wellbore (1), and a return spring (4) is sleeved on the outer wall of the top end of the lower wellbore (2), and the return spring (4) is located in the return spring groove at the lower end of the upper wellbore (1).

7. The guide running and retrieval tool according to claim 6, characterized in that: The top end of the guide outer sleeve (100) is configured as an inclined surface (101).

8. The guide running and retrieval tool according to claim 7, characterized in that: The lower wellbore (2) is provided with a threaded section, a return spring section, a sleeve portion docking section of the elastic claw, a claw portion sleeve connection section of the elastic claw, and a nozzle section in order from top to bottom. Wherein, an external thread is provided on the outer wall of the threaded section, for connecting the lower wellbore (2) and the upper wellbore (1) via threads; The return spring segment is used to set the return spring (4); The sleeve portion docking section of the elastic claw is used to set the sleeve portion (31) of the elastic claw (3); The claw portion sleeve section of the elastic claw is used to set the claw portion (32) of the elastic claw (3); The bottom end of the nozzle section is used to set the nozzle (5).

9. The guide running and retrieval tool according to claim 8, characterized in that: An annular step (21) is provided at the junction of the claw portion sleeve section of the elastic claw and the nozzle section, and the outer wall of the claw portion sleeve section of the elastic claw close to the annular step (21) expands outward to form an expansion section (22); The outer diameter of the upper end of the sleeve section of the claw portion of the elastic claw is equal to the outer diameter of the lower end of the docking section of the sleeve portion of the elastic claw, forming a straight section (23); The straight section (23) and the expansion section (22) are transitionally connected via an inclined section (24); When the sleeve portion (31) of the elastic claw (3) is sleeved on the outer wall of the middle and lower part of the lower wellbore (2), the arc-shaped clamping head (33) at the bottom end of the multiple arc-shaped pieces (320) of the claw portion (32) of the elastic claw (3) is closely attached to the expansion section (22) to form a ring body with an adjustable outer diameter; When the ring body with adjustable outer diameter is disengaged from the ring body clamping groove (102) at the upper end of the guide outer sleeve (100), the arc-shaped clamping head (33) at the bottom end of the plurality of arc-shaped pieces (320) slides from the expansion section (22) through the inclined section (24) to the straight section (23), and the ring body with adjustable outer diameter is disengaged from the ring body clamping groove (102) at the upper end of the guide outer sleeve (100), thereby achieving the unlocking of the guide lowering and recovery tool and the guide outer sleeve (100).

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