Hydraulic ultra-short reaming-while-drilling tool capable of being repeatedly activated

Abstract

The invention discloses a hydraulic ultra-short reaming-while-drilling tool capable of being repeatedly activated, and relates to the technical field of petroleum drilling equipment, the hydraulic ultra-short reaming-while-drilling tool comprises a shell, an activation mechanism, a transmission mechanism, a guide locking mechanism and a driving mechanism are sequentially arranged in the shell from front to back, and a plurality of cutter outlet grooves are evenly formed in the outer wall of the front portion of the shell in the circumferential direction; a knife outlet groove is formed in the guide locking mechanism, a knife wing is arranged in the knife outlet groove in a sliding mode, the driving mechanism drives the guide locking mechanism to move, the guide locking mechanism is in transmission connection with the activation mechanism through a transmission mechanism, and the activation mechanism is used for driving the knife wing to be unfolded or folded. Hydraulic pressure is changed by continuously adjusting the displacement of drilling fluid, so that the driving mechanism moves back and forth, the blade can be repeatedly unfolded or contracted, starting and retracting of the reaming tool are completed, the tripping times are reduced, the working efficiency is improved, the unfolding state of the blade can be locked through the guide locking mechanism, and the problem that the borehole diameter is irregular after drilling is solved.

Description

Technical Field

[0001] The invention relates to the technical field of oil drilling equipment, in particular to a hydraulic ultra-short hole-reaming tool that can be repeatedly activated. Background Art

[0002] The safe supply of oil and natural gas is a major strategic need of the country. The exploration and development of domestic oil and gas resources is an important way to ensure the safety of oil and gas. As the conventional shallow and medium-deep oil and gas development on land in my country has entered the late stage of exploitation, the remaining oil-rich areas are mainly concentrated in small-scale areas such as small ridges and small interlayers. The use of casing window side drilling with large curvature can effectively tap such remaining oil resources. However, the side drilling of windows in the oil layer casing is limited by the size of the original wellbore, and the side drilling wellbore is further reduced, resulting in reduced cuttings migration efficiency and increased risk of mud bag formation, which in turn induces complex downhole conditions such as wellbore shrinkage and drill sticking.

[0003] The use of reaming while drilling technology can solve the above problems and significantly improve the efficiency of drilling and completion. The existing reaming while drilling tools are mainly ball-activated reaming tools, which face problems such as tool size being too long and requiring re-activation after bottom hole activation. It is difficult to meet the construction needs of economical and efficient window opening and side drilling of large curvature wells. At the same time, domestic reaming tools generally lack locking functions, and the wellbore after reaming has irregular diameters, which seriously affects the operation efficiency and wellbore quality. Summary of the invention

[0004] In view of this, the present invention provides a re-activatable hydraulic ultra-short hole-reaming tool to solve the problems raised in the above background technology, and specifically discloses the following contents:

[0005] A hydraulic ultra-short reaming tool that can be repeatedly activated comprises a shell, wherein an activation mechanism, a transmission mechanism, a guide locking mechanism and a driving mechanism are sequentially arranged inside the shell from front to back, a plurality of knife grooves are evenly arranged circumferentially on the outer wall of the front portion of the shell, knife wings are slidably arranged in the knife grooves, the driving mechanism drives the guide locking mechanism to move, the guide locking mechanism is transmission-connected to the activation mechanism via a transmission mechanism, and the activation mechanism is used to drive the knife wings to expand or retract.

[0006] Furthermore, the activation mechanism comprises a punch pipe, a spring and a sliding sleeve, the sliding sleeve is fixedly mounted on the punch pipe, and an annular protrusion is fixedly disposed at the rear end of the punch pipe;

[0007] The housing comprises a washing housing, a cutting housing, a guiding housing and a starting housing which are fixedly connected in sequence from front to back, the knife outlet groove is arranged on the outer wall of the cutting housing, a plurality of inclined tracks are evenly arranged circumferentially on the outer wall of the front part of the sliding sleeve, a driving sliding groove adapted to the inclined track is arranged on the inner side of the blade, and the sliding sleeve moves forward to drive the blade to unfold;

[0008] An annular groove matching the annular protrusion is provided on the inner wall of the rear part of the cutting shell, and the spring sleeve is arranged on the rear part of the sliding sleeve; one end of the spring is fixedly connected to the front end wall of the annular protrusion, and the other end is fixedly connected to the front wall of the annular groove.

[0009] Furthermore, a plurality of pressure relief holes are evenly arranged on the outer wall of the front part of the flushing tube, a plurality of water eyes are evenly arranged on the inner wall of the water washing shell, a plurality of water flow channels are arranged on the outer wall of the water washing shell, and the water flow channels are inclined, one end of the water flow channel is connected to the water eyes, and the other end faces the middle groove of the blade.

[0010] Further, the guide locking mechanism comprises a transposition shaft, a guide slide groove is circumferentially provided on the outer wall of the transposition shaft, and a plurality of first locking slide grooves, a plurality of second locking slide grooves and a plurality of third locking slide grooves are evenly provided on the outer wall of the transposition shaft;

[0011] The first locking slide groove and the third locking slide groove are both located at the front side of the guide slide groove and are connected to the guide slide groove; the second locking slide groove is located at the rear side of the guide slide groove and is connected to the guide slide groove; two second locking slide grooves and one third locking slide groove are arranged between two adjacent first locking slide grooves, and the third locking slide groove is located between the two second locking slide grooves; the third locking slide groove has the same length as the second locking slide groove, and both are smaller than the first locking slide groove;

[0012] A plurality of threaded holes are uniformly provided on the outer wall of the guide housing in a circumferential direction, and ejector pins are embedded in the threaded holes. The ejector pins move in a guide path formed among the first locking slide groove, the second locking slide groove, the third locking slide groove and the guide slide groove.

[0013] Furthermore, a plurality of strip-shaped protrusions are evenly arranged on the outer wall of the transposition shaft in a circumferential direction, the strip-shaped protrusions are arranged corresponding to the first locking slide groove, and the strip-shaped protrusions are located at the front side of the first locking slide groove;

[0014] An annular avoidance groove matched with the strip-shaped protrusion is provided on the inner wall of the guide shell, and a plurality of long grooves and short grooves are evenly arranged circumferentially on the inner wall of the guide shell. The long grooves and the short grooves are arranged at intervals. The long grooves and the short grooves are both located on the rear side of the annular avoidance groove and are connected to the annular avoidance groove. The long grooves and the short grooves are both matched with the strip-shaped protrusion, and the length of the long groove is greater than that of the short groove.

[0015] Further, the driving mechanism comprises a sliding piston, the sliding piston is fixedly connected to the rear end of the transposition shaft, and the inner wall of the rear end of the guide housing is adapted to the sliding piston;

[0016] The axial positions of the sliding piston, the transposition shaft, the transmission mechanism and the flushing pipe form a drilling fluid circulation channel.

[0017] Furthermore, the transmission mechanism includes a first connecting key and a second connecting key, the first connecting key and the second connecting key are connected via a rolling bearing, the front end of the first connecting key is connected to the rear end of the annular protrusion, and the rear end of the second connecting key is connected to the front end of the transposition shaft.

[0018] The beneficial effects of the present invention are:

[0019] The present invention changes the hydraulic pressure by continuously adjusting the drilling fluid displacement, thereby making the driving mechanism move back and forth, and can repeatedly realize the expansion or contraction of the blade, complete the start-up and retraction of the eye-opening tool, reduce the number of trips, and improve work efficiency. In addition, the guide locking mechanism in the present invention can lock the expansion state of the blade, avoiding the problem of irregular wellbore after drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0021] Figure 1 The present invention is a schematic diagram of the internal structure of a hydraulic ultra-short hole-reaming tool that can be repeatedly activated.

[0022] Figure 2 It is a schematic diagram of the structure of the sliding sleeve in the present invention.

[0023] Figure 3 It is a schematic diagram of the internal structure of the water washing shell in the present invention.

[0024] Figure 4 It is a schematic diagram of the structure of the flushing pipe in the present invention.

[0025] Figure 5 It is a schematic diagram of the internal structure of the transmission housing in the present invention.

[0026] Figure 6 It is a structural schematic diagram of the transposition axis in the present invention.

[0027] Figure 7 It is a schematic diagram of the present invention in a non-activated blade state.

[0028] Figure 8 It is a schematic diagram of the present invention in the blade wing activation state.

[0029] Fig. 9 It is a schematic diagram of the blade wing being activated and locked in the present invention.

[0030] Among them, in the figure:

[0031] 1-water washing shell; 1a-water eye; 1b-water flow channel; 2-flushing pipe; 2a-pressure relief hole; 3-blade; 4-cutting shell; 5-sleeve; 5a-inclined track; 6-spring; 7-first connecting key; 8-rolling bearing; 9-second connecting key; 10-guide shell; 10a-threaded hole; 10b-long groove; 10c-short groove; 11-transposition shaft; 11a-strip protrusion; 11b-guide slide groove; 11c-first locking slide groove; 11d-second locking slide groove; 11e-third locking slide groove; 12-thimble; 13-starting shell; 14-sliding piston. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention are described clearly and completely below. 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 creative work are within the scope of protection of the present invention.

[0033] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or components is not necessarily limited to those steps or components that are clearly listed, but may include other steps or components that are not clearly listed or inherent to these processes, methods, products or devices.

[0034] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0035] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0036] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; 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 an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] See attached Figure 1-6 The present invention discloses a hydraulic ultra-short drilling reaming tool that can be repeatedly activated, comprising a shell, wherein an activation mechanism, a transmission mechanism, a guide locking mechanism and a driving mechanism are sequentially arranged inside the shell from front to back, a plurality of knife grooves are evenly arranged circumferentially on the outer wall of the front portion of the shell, a knife wing 3 is slidably arranged in the knife groove, the driving mechanism drives the guide locking mechanism to move, the guide locking mechanism is connected to the activation mechanism through the transmission mechanism, and the activation mechanism is used to drive the knife wing 3 to expand or retract.

[0038] In this embodiment, the hydraulic pressure is increased to make the driving mechanism move forward, and the activation mechanism is moved forward through the transmission mechanism, so that the blade wing 3 is extended and unfolded, and the guide locking mechanism limits the overall axial movement inside the shell to ensure that the blade wing 3 is fixed; when the blade wing 3 is retracted, the hydraulic pressure is reduced so that the blade wing 3 is retracted into the blade outlet groove under the action of the activation mechanism.

[0039] This embodiment changes the hydraulic pressure by continuously adjusting the drilling fluid displacement, so that the driving mechanism moves back and forth, and the blade 3 can be repeatedly expanded or retracted, so as to complete the start-up and retraction of the reaming tool, reduce the number of trips, and improve work efficiency. In addition, the guide locking mechanism in the present invention can lock the expanded state of the blade 3, avoiding the problem of irregular wellbore after drilling.

[0040] The activation mechanism includes a punch tube 2, a spring 6 and a sliding sleeve 5. The sliding sleeve 5 is fixedly sleeved on the punch tube 2. An annular protrusion is fixedly provided at the rear end of the punch tube 2.

[0041] The housing comprises a washing housing 1, a cutting housing 4, a guide housing 10 and a starting housing 13 which are fixedly connected in sequence from front to back. A knife outlet groove is arranged on the outer wall of the cutting housing 4. A plurality of inclined rails 5a are evenly arranged on the outer wall of the front part of the sliding sleeve 5 in a circumferential direction. A driving sliding groove which is adapted to the inclined rails 5a is arranged on the inner side of the blade wing 3. The sliding sleeve 5 moves forward to drive the blade wing 3 to unfold.

[0042] An annular groove matching the annular protrusion is provided on the rear inner wall of the cutting shell 4, and a spring 6 is sleeved on the rear of the sliding sleeve 5; one end of the spring 6 is fixedly connected to the front end wall of the annular protrusion, and the other end is fixedly connected to the front wall of the annular groove.

[0043] In this embodiment, the sleeve 5 is nested on the punch tube 2 through interference fit, the number of the inclined rails 5a and the blade 3 are both 3, the annular protrusion is two annular steps connected in sequence, the annular step with a smaller radius abuts against the rear end of the sleeve 5, and the annular step with a larger radius is adapted to the annular groove.

[0044] A plurality of pressure relief holes 2a are evenly arranged on the outer wall of the front part of the flushing pipe 2, a plurality of water eyes 1a are evenly arranged on the inner wall of the water washing shell 1, and a plurality of water flow channels 1b are arranged on the outer wall of the water washing shell 1. The water flow channels 1b are inclined, one end of the water flow channel 1b is connected to the water eye 1a, and the other end faces the middle groove of the blade 3.

[0045] In this embodiment, the number of water holes 1a is 3 and the number of pressure relief holes 2a is 8. The pressure relief holes 2a are in a sealed state before the blade 3 is unfolded; when the blade 3 is unfolded, the annular protrusion compresses the spring 6, the flushing pipe 2 moves forward, the pressure relief holes 2a are connected to the inner cavity of the water washing shell 1, and the drilling fluid enters the inner cavity of the water washing shell 1 through the pressure relief holes 2a, and then flows through the water holes 1a and the water hole flow channel 1b, and then is sprayed at high speed to clean the blade 3.

[0046] The guide locking mechanism comprises a transposition shaft 11, a guide slot 11b is circumferentially arranged on the outer wall of the transposition shaft 11, and a plurality of first locking slots 11c, a plurality of second locking slots 11d and a plurality of third locking slots 11e are evenly arranged on the outer wall of the transposition shaft 11;

[0047] The first locking slot 11c and the third locking slot 11e are both located in front of the guide slot 11b and connected to the guide slot 11b; the second locking slot 11d is located in the rear of the guide slot 11b and connected to the guide slot 11b; two second locking slots 11d and one third locking slot 11e are arranged between two adjacent first locking slots 11c, and the third locking slot 11e is located between the two second locking slots 11d; the third locking slot 11e and the second locking slot 11d have the same length, and are both smaller than the first locking slot 11c;

[0048] A plurality of threaded holes 10a are evenly penetrated circumferentially on the outer wall of the guide housing 10, and a ejector pin 12 is embedded in the threaded hole 10a. The ejector pin 12 moves along a guide path formed among the first locking groove 11c, the second locking groove 11d, the third locking groove 11e and the guide groove 11b.

[0049] In this embodiment, the number of ejector pins 12 is four.

[0050] A plurality of strip-shaped protrusions 11a are evenly arranged on the outer wall of the transposition shaft 11 in the circumferential direction. The strip-shaped protrusions 11a are arranged corresponding to the first locking groove 11c. The strip-shaped protrusions 11a are located in front of the first locking groove 11c.

[0051] An annular avoidance groove matched with the strip-shaped protrusion 11a is provided on the inner wall of the guide shell 10, and a plurality of long grooves 10b and short grooves 10c are evenly arranged circumferentially on the inner wall of the guide shell 10. The long grooves 10b and the short grooves 10c are arranged at intervals. The long grooves 10b and the short grooves 10c are both located on the rear side of the annular avoidance groove and are connected to the annular avoidance groove. The long grooves 10b and the short grooves 10c are both matched with the strip-shaped protrusion 11a, and the length of the long groove 10b is greater than that of the short groove 10c.

[0052] In this embodiment, the number of the strip-shaped protrusions 11 a , the number of the long grooves 10 b and the number of the short grooves 10 c are all four.

[0053] The driving mechanism includes a sliding piston 14, which is fixedly connected to the rear end of the transposition shaft 11, and the inner wall of the rear end of the guide housing 10 is adapted to the sliding piston 14;

[0054] The sliding piston 14, the transposition shaft 11, the transmission mechanism and the axial center position of the flushing pipe 2 form a drilling fluid circulation channel.

[0055] The transmission mechanism includes a first connecting key 7 and a second connecting key 9. The first connecting key 7 and the second connecting key 9 are connected via a rolling bearing 8. The front end of the first connecting key 7 is connected to the rear end of the annular protrusion, and the rear end of the second connecting key 9 is connected to the front end of the transposition shaft 11.

[0056] Directions:

[0057] When the blade is not activated:

[0058] See also Figure 7 During normal drilling, the drilling fluid flows through the sliding piston 14, the transposition shaft 11, the second connecting key 9, the first connecting key 7 and the flushing pipe 2 in sequence. The strip protrusion 11a of the transposition shaft 11 is located in the long groove 10b, the ejector pin 12 is stuck in the front end of the first locking slide groove 11c, the pressure relief hole 2a of the flushing pipe 2 is tightly attached to the inner wall of the water washing shell 1 and is in a sealed state. The spring 6 is not subjected to force and remains in its original state, and the blade 3 is retracted in the cutting shell 4.

[0059] When the blade wing state is activated:

[0060] See also Figure 8, increase the drilling fluid displacement to the activation displacement, the sliding piston 14 is forced to slide forward, and the transposition shaft 11 rotates clockwise (from the back to the front) under the limiting action of the ejector pin 12 until the ejector pin is stuck in the second locking groove 11d, and the guide locking mechanism transmits the force to the flushing pipe 2 through the transmission mechanism. Under the action of the rolling bearing 8, the flushing pipe 2 only moves axially, and the spring 6 is compressed under the drive of the annular protrusion of the flushing pipe 2. The blade 3 is radially expanded under the extrusion of the inclined track 5a of the sliding sleeve 5. At this time, the pressure relief hole 2a is connected to the inner cavity of the water washing shell 1, and the drilling fluid enters the internal cavity of the water washing shell 1 through the pressure relief hole 2a, and then flows through the water eye 1a through the water eye flow channel 1b and is sprayed at high speed to clean the blade 3.

[0061] When the blade is activated and locked:

[0062] See attached Fig. 9 After the blade wing 3 is unfolded, the drilling fluid displacement is reduced to the normal working displacement, and the flushing pipe 2 moves backward under the restoring force of the spring 6. The flushing pipe 2 applies a backward axial force to the guide locking mechanism through the transmission mechanism. The transposition shaft 11 rotates clockwise (from the back to the front) under the limiting action of the ejector pin 12 until the ejector pin 12 is stuck in the third locking groove 11e of the transposition shaft 11, and the strip protrusion 11a of the transposition shaft 11 is stuck in the short groove 10c of the inner wall of the guide housing 10. The blade wing 3 reaches a locked state, and the activation process of the reaming tool is completed.

[0063] The process of unlocking and retracting the activated and locked blade:

[0064] First, the drilling fluid displacement is increased to the activation displacement, the sliding piston 14 is forced to slide forward, and the transposition shaft 11 rotates clockwise (from the back to the front) under the limiting action of the ejector pin 12 until the ejector pin 12 is stuck in the second locking groove 11d, and the strip protrusion 11a of the transposition shaft 11 leaves the short groove 10c on the inner wall of the guide housing 10;

[0065] The drilling fluid displacement is reduced to the normal working displacement again, and the flushing pipe 2 is lifted up under the restoring force of the spring 6. The pressure relief hole 2a of the flushing pipe 2 is tightly attached to the inner wall of the water washing shell 1 to achieve sealing again. The flushing pipe 2 gives a backward axial force to the locking mechanism through the transmission mechanism, and the transposition shaft 11 continues to rotate clockwise (from the back to the front) until the ejector pin 12 reaches the first locking groove 11c of the transposition shaft, and the strip protrusion 11a of the transposition shaft 11 enters the long groove 10b of the inner wall of the guide shell 10, and the spring 6 returns to its original length. The blade 3 is radially retracted into the blade outlet groove of the cutting shell 4 under the action of the inclined track 5a of the sliding sleeve 5.

[0066] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A re-activatable hydraulic ultra-short hole-reaming tool, characterized in that: The invention comprises a shell, wherein an activation mechanism, a transmission mechanism, a guide locking mechanism and a driving mechanism are arranged in sequence from front to back inside the shell, a plurality of knife outlet grooves are evenly arranged on the outer wall of the front part of the shell in a circumferential direction, a knife wing (3) is slidably arranged in the knife outlet groove, the driving mechanism drives the guide locking mechanism to move, the guide locking mechanism is connected to the activation mechanism through the transmission mechanism, and the activation mechanism is used to drive the knife wing (3) to expand or retract.

2. A re-activatable hydraulic ultra-short hole-reaming tool according to claim 1, characterized in that: The activation mechanism comprises a punching tube (2), a spring (6) and a sliding sleeve (5); the sliding sleeve (5) is fixedly sleeved on the punching tube (2); and an annular protrusion is fixedly provided at the rear end of the punching tube (2); The shell comprises a washing shell (1), a cutting shell (4), a guide shell (10) and a starting shell (13) which are fixedly connected in sequence from front to back, the knife outlet groove is arranged on the outer wall of the cutting shell (4), a plurality of inclined plane tracks (5a) are evenly arranged on the outer wall of the front part of the sliding sleeve (5) in a circumferential direction, a driving sliding groove adapted to the inclined plane track (5a) is arranged on the inner side of the blade (3), and the sliding sleeve (5) moves forward to drive the blade (3) to unfold; An annular groove matching the annular protrusion is provided on the inner wall of the rear part of the cutting shell (4), and the spring (6) is sleeved on the rear part of the sliding sleeve (5); one end of the spring (6) is fixedly connected to the front end wall of the annular protrusion, and the other end is fixedly connected to the front wall of the annular groove.

3. A re-activatable hydraulic ultra-short hole-reaming tool according to claim 2, characterized in that: A plurality of pressure relief holes (2a) are evenly arranged on the outer wall of the front part of the flushing pipe (2), a plurality of water holes (1a) are evenly arranged on the inner wall of the water washing shell (1), and a plurality of water flow channels (1b) are arranged on the outer wall of the water washing shell (1). The water flow channels (1b) are inclined, one end of the water flow channel (1b) is connected to the water hole (1a), and the other end faces the middle groove of the blade (3).

4. A re-activatable hydraulic ultra-short hole-reaming tool according to claim 2, characterized in that: The guide locking mechanism comprises a transposition shaft (11), a guide sliding groove (11b) is circumferentially provided on the outer wall of the transposition shaft (11), and a plurality of first locking sliding grooves (11c), a plurality of second locking sliding grooves (11d) and a plurality of third locking sliding grooves (11e) are evenly provided on the outer wall of the transposition shaft (11); The first locking groove (11c) and the third locking groove (11e) are both located at the front side of the guide groove (11b) and connected to the guide groove (11b); the second locking groove (11d) is located at the rear side of the guide groove (11b) and connected to the guide groove (11b); two second locking grooves (11d) and one third locking groove (11e) are arranged between two adjacent first locking grooves (11c), and the third locking groove (11e) is located between the two second locking grooves (11d); the third locking groove (11e) and the second locking groove (11d) have the same length and are both smaller than the first locking groove (11c); A plurality of threaded holes (10a) are uniformly provided on the outer wall of the guide housing (10) in a circumferential direction, and a push pin (12) is embedded in the threaded hole (10a). The push pin (12) moves in a guide path formed among the first locking groove (11c), the second locking groove (11d), the third locking groove (11e) and the guide groove (11b).

5. A re-activatable hydraulic ultra-short hole-reaming tool according to claim 4, characterized in that: A plurality of strip-shaped protrusions (11a) are evenly arranged on the outer wall of the transposition shaft (11) in a circumferential direction, the strip-shaped protrusions (11a) are arranged corresponding to the first locking slide groove (11c), and the strip-shaped protrusions (11a) are located at the front side of the first locking slide groove (11c); The inner wall of the guide housing (10) is provided with an annular avoidance groove matched with the strip-shaped protrusion (11a); a plurality of long grooves (10b) and short grooves (10c) are evenly arranged circumferentially on the inner wall of the guide housing (10); the long grooves (10b) and the short grooves (10c) are arranged at intervals; the long grooves (10b) and the short grooves (10c) are both located at the rear side of the annular avoidance groove and are connected to the annular avoidance groove; the long grooves (10b) and the short grooves (10c) are both matched with the strip-shaped protrusion (11a); and the length of the long grooves (10b) is greater than that of the short grooves (10c).

6. A re-activatable hydraulic ultra-short hole-reaming tool according to claim 4, characterized in that: The driving mechanism comprises a sliding piston (14), the sliding piston (14) is fixedly connected to the rear end of the transposition shaft (11), and the inner wall of the rear end of the guide housing (10) is adapted to the sliding piston (14); The sliding piston (14), the transposition shaft (11), the transmission mechanism and the axial center position of the flushing pipe (2) form a drilling fluid circulation channel.

7. A re-activatable hydraulic ultra-short hole-reaming tool according to claim 4, characterized in that: The transmission mechanism comprises a first connecting key (7) and a second connecting key (9), the first connecting key (7) and the second connecting key (9) are connected via a rolling bearing (8), the front end of the first connecting key (7) is connected to the rear end of the annular protrusion, and the rear end of the second connecting key (9) is connected to the front end of the transposition shaft (11).

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