Retractable deviation-correcting bit with auxiliary drilling function

Abstract

The present invention provides a telescopic deviation-correcting drill bit with an auxiliary drilling function, belonging to the technical field of drilling tools, which includes a drill bit body, an auxiliary drilling structure and a deviation-correcting joint; a plurality of fixed cutter wings are arranged on the drill bit body; the drill bit body is connected with a fixed joint; the auxiliary drilling structure includes a cutting head arranged at the top of the drill bit body, and a spray hole longitudinally opened is arranged inside the cutting head; the deviation-correcting joint includes an outer sleeve, an inner cylinder and a deviation-correcting component, the outer sleeve is connected with the fixed joint, the outer sleeve is hinged with the inner cylinder, and an annular adjustment space is provided between the outer sleeve and the inner cylinder; the deviation-correcting component includes a plurality of main electromagnets arranged on the inner side wall of the outer sleeve and a plurality of sub-electromagnets arranged on the outer side wall of the inner cylinder. The telescopic deviation-correcting drill bit with an auxiliary drilling function provided by the present invention drives the rotation between the outer sleeve and the inner cylinder through the paired electromagnets to achieve the purpose of correcting the deviation of the drill bit body, realizes timely deviation correction, and reduces the deviation value of the drilled hole.

Description

Technical Field

[0001] The present invention belongs to the technical field of drilling tools, and more specifically, relates to a telescopic deviation-correcting bit with an auxiliary drilling function. Background Art

[0002] Under the existing technical conditions, the reaming bits for pipe-roof follow-up generally use spiral bits or high-pressure water jet guiding bits; the spiral bit has a simple structure and is easy to operate, but it cannot achieve the guiding function, and it is rather troublesome to correct the deviation once eccentricity occurs; the high-pressure water jet guiding bit can conduct good guiding, but it is costly and not convenient for popularization.

[0003] Chinese Patent CN201410788186.1 discloses a PDC bit with retractable cutter wings. It is mainly to solve the problem that the existing bits cannot flexibly adapt to various formations. It mainly consists of a matrix, a hydraulic channel, a nozzle, a fixed cutter wing, a movable cutter wing, a snap ring, a T-shaped block, a T-shaped groove, and a limit anti-disengagement block. The fixed cutter wing is fixed on the matrix and integrated with it; the movable cutter wing is limited in the T-shaped groove on the matrix by the T-shaped block. There is a limit anti-disengagement block at the lower part of the groove and a snap ring at the upper part. Under different drilling modes, the bit bears different drilling pressures, and the movable cutter wing can automatically expand and contract according to the magnitude of the drilling pressure. This patent only focuses on using the retractable cutter wings to adapt to the drilling under different formations to ensure efficiency, but there is no deviation-correcting function. Summary of the Invention

[0004] The purpose of the present invention is to provide a telescopic deviation-correcting bit with an auxiliary drilling function, aiming to achieve real-time deviation correction of the bit and reduce the deviation value of the borehole.

[0005] To achieve the above object, the technical solution adopted by the present invention is: to provide a telescopic deviation-correcting bit with an auxiliary drilling function, including:

[0006] A bit body, on which a plurality of circumferentially arranged fixed cutter wings are provided; a fixed joint is connected to the lower end of the bit body; a water flow channel is arranged inside the bit body, and a plurality of water spraying holes communicating with the water flow channel are provided on the bit body, and the plurality of water spraying holes and the plurality of fixed cutter wings are arranged alternately;

[0007] An auxiliary drilling structure, including a cutting head arranged at the top end of the bit body, the cutting head is conical, and a spraying hole longitudinally opened is arranged inside the cutting head, and the spraying hole communicates with the water flow channel;

[0008] The deviation rectifying joint includes an outer sleeve, an inner cylinder and a deviation rectifying component. The outer sleeve is connected to the fixed joint. The upper end of the inner cylinder is flexibly connected to the lower end of the fixed joint, and the lower end of the inner cylinder is connected to the drill pipe. The outer sleeve is hinged to the inner cylinder, and there is an annular adjustment space between the outer sleeve and the inner cylinder. The deviation rectifying component is located in the annular adjustment space. The deviation rectifying component includes a plurality of main electromagnets provided on the inner side wall of the outer sleeve and a plurality of secondary electromagnets provided on the outer side wall of the inner cylinder, and the main electromagnets and the secondary electromagnets correspond to each other one by one.

[0009] As another embodiment of the present application, there are two pairs of hinge shafts in the annular adjustment space. The two pairs of hinge shafts are longitudinally spaced apart, and the included angle of the longitudinal projections of any two pairs of hinge shafts is a right angle. Each pair of hinge shafts is symmetrically arranged on both sides of the inner cylinder. The deviation rectifying component is located above the hinge shafts.

[0010] As another embodiment of the present application, a sealing groove is provided at the lower end of the fixed joint, and a sealing gasket is provided at the bottom of the sealing groove. The upper end of the inner cylinder extends into the sealing groove and abuts against the sealing gasket. The outer diameter of the inner cylinder is smaller than the outer diameter of the sealing groove, and the inner diameter of the inner cylinder is larger than the inner diameter of the sealing groove.

[0011] As another embodiment of the present application, a first water channel and a second water channel are respectively provided in the fixed joint and the inner cylinder, and the water flow channel, the first water channel and the second water channel are communicated in sequence.

[0012] As another embodiment of the present application, a flexible sealing sleeve is provided at the interface between the first water channel and the second water channel.

[0013] As another embodiment of the present application, a movable blade is also slidably connected to the drill bit body. A longitudinal limiting groove is provided in the lower part of the drill bit body. The notch of the limiting groove faces outward. Two side baffles are provided at the notch of the limiting groove. The two side baffles are respectively attached to the two side walls of the limiting groove, and there is a first gap between the two side baffles. The lower end of the side baffle is attached to the end of the limiting groove, and there is a second gap between the upper part of the baffle and the other end of the limiting groove. A slider adapted to the limiting groove is provided on the inner side of the movable blade. The slider includes a fitting part adapted to the limiting groove and an extension part passing through the first gap to connect the fitting part and the movable blade. The height of the fitting part is smaller than the height of the second gap. The extension part is located in the first gap and both sides of the extension part are attached to the two side baffles.

[0014] As another embodiment of the present application, a sliding connection groove is provided in the upper part of the drill bit body, a connecting part is provided on the movable blade, and a return spring is longitudinally provided between the sliding connection groove and the connecting part.

[0015] As another embodiment of the present application, auxiliary water spray holes are formed in the drill bit body, and the auxiliary water spray holes communicate with the water flow channel and the lower part of the limiting groove.

[0016] As another embodiment of the present application, an auxiliary water channel is formed on one side of the water flow channel, and the auxiliary water channel sequentially penetrates through the drill bit body, the fixed joint and the outer sleeve. The end of the auxiliary water channel is connected to a water passing hole on the side wall of the inner cylinder by means of a hose.

[0017] As another embodiment of the present application, an annular buffer water tank is formed at the upper end of the outer sleeve, and the buffer water tank communicates with the auxiliary water channel.

[0018] The beneficial effects of the telescopic deviation-correcting drill bit with an auxiliary drilling function provided by the present invention are as follows: Compared with the prior art, the telescopic deviation-correcting drill bit with an auxiliary drilling function of the present invention realizes the primary crushing of the soil layer by arranging a cutting head at the top of the drill bit body and assisting the drilling through the spray holes. Furthermore, when the fixed cutter wings perform secondary crushing on the soil layer, it will be easier, improving the soil layer crushing efficiency. And a deviation-correcting assembly is connected to the rear end of the drill bit body. By driving the rotation between the outer sleeve and the inner cylinder through a pair of electromagnets, an included angle is formed between the axial direction of the drill pipe and the axial direction of the drill bit body to achieve the purpose of correcting the deviation of the drill bit body, realizing timely deviation correction and reducing the deviation value of the drill hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a schematic structural diagram of the telescopic deviation-correcting drill bit with an auxiliary drilling function provided by the first embodiment of the present invention;

[0021] Figure 2 It is a schematic structural diagram of the telescopic deviation-correcting drill bit with an auxiliary drilling function provided by the second embodiment of the present invention;

[0022] Figure 3 For Figure 2 The partial cross-sectional view taken along line A-A in

[0023] Figure 4 For Figure 2 The partial cross-sectional view taken along line B-B in

[0024] Figure 5Schematic diagram of the telescopic deviation-correcting bit with auxiliary drilling function provided by the third embodiment of the present invention in the state where the movable blade is retracted;

[0025] Figure 6 Schematic diagram of the telescopic deviation-correcting bit with auxiliary drilling function provided by the third embodiment of the present invention in the state where the movable blade is extended;

[0026] Figure 7 Top view of the deviation-correcting joint provided by the embodiment of the present invention.

[0027] In the figure: 1, drill bit body; 2, fixed blade; 3, cutting head; 4, water flow channel; 5, water spray hole; 6, injection hole; 7, fixed joint; 8, outer sleeve; 9, flexible seal; 10, gasket; 11, inner cylinder; 12, main electromagnet; 13, auxiliary electromagnet; 14, first water channel; 15, second water channel; 16, movable blade; 17, return spring; 18, fitting part; 19, side baffle; 20, tension spring; 21, hinge shaft; 22, circular groove; 23, auxiliary water spray hole; 24, auxiliary water channel. Detailed implementation manners

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] Please refer to Figures 1 to 7 , and now the telescopic deviation-correcting bit with auxiliary drilling function provided by the present invention will be described. The telescopic deviation-correcting bit with auxiliary drilling function includes a drill bit body 1, an auxiliary drilling structure and a deviation-correcting joint; a plurality of fixed blades 2 arranged circumferentially are provided on the drill bit body 1; a fixed joint 7 is connected to the lower end of the drill bit body 1; a water flow channel 4 is provided inside the drill bit body 1, and a plurality of water spray holes 5 communicating with the water flow channel 4 are provided on the drill bit body 1, and the plurality of water spray holes 5 and the plurality of fixed blades 2 are arranged alternately; the auxiliary drilling structure includes a cutting head 3 provided at the top end of the drill bit body 1, the cutting head 3 is conical, and a longitudinally opened injection hole 6 is provided inside the cutting head 3, and the injection hole 6 communicates with the water flow channel 4; the deviation-correcting joint includes an outer sleeve 8, an inner cylinder 11 and a deviation-correcting component, the outer sleeve 8 is connected to the fixed joint 7, the upper end of the inner cylinder 11 is softly connected to the lower end of the fixed joint 7, and the lower end of the inner cylinder 11 is connected to the drill pipe; the outer sleeve 8 and the inner cylinder 11 are hinged, and an annular adjustment space is provided between the outer sleeve 8 and the inner cylinder 11; the deviation-correcting component is located in the annular adjustment space, and the deviation-correcting component includes a plurality of main electromagnets 12 provided on the inner side wall of the outer sleeve 8 and a plurality of auxiliary electromagnets 13 provided on the outer side wall of the inner cylinder 11, and the main electromagnets 12 and the auxiliary electromagnets 13 correspond one by one.

[0030] The telescopic deviation-correcting drill bit with an auxiliary drilling function provided by the present invention, compared with the prior art, has a plurality of fixed cutter wings 2 circumferentially arranged on the drill bit body 1, and water spraying holes 5 communicating with the water flow channel 4 are opened between two adjacent fixed cutter wings 2; during drilling, while the fixed cutter wings 2 cut the soil layer, the water spraying holes 5 spray water outward.

[0031] A conical cutting head 3 is arranged at the top end of the drill bit body 1, and longitudinal spraying holes 6 are opened on the cutting head 3; during cutting, the spraying holes 6 spray water forward to soften the soil layer, and then the cutting head 3 drills forward. The conical shape of the cutting head 3 is used to drill into the soil layer, breaking or cracking the cross-section of the soil layer, and then the fixed cutter wings 2 of the drill bit body 1 are used to perform secondary drilling on the soil layer, improving the soil layer crushing efficiency and facilitating hole formation during drilling.

[0032] A fixed joint 7 is connected to the lower end of the drill bit body 1, and an outer sleeve 8 of the deviation-correcting assembly is connected to the lower end of the fixed joint 7. The inner cylinder 11 of the deviation-correcting assembly is flexibly connected to the drill bit body 1, and the outer sleeve 8 is hinged to the inner cylinder 11. An annular adjustment space is formed between the outer sleeve 8 and the inner cylinder 11. There are multiple pairs of main electromagnets 12 and secondary electromagnets 13 in the annular adjustment space, and adjacent pairs of electromagnets are arranged at an angle. When one pair of electromagnets is energized, this pair of electromagnets attract each other, causing the outer sleeve 8 to rotate around the hinge axis 21. The outer sleeve 8 drives the connected fixed joint 7 and the drill bit body 1 to rotate simultaneously, so that the axis of the drill bit body 1 forms an angle with the axis of the inner cylinder 11 and the drill pipe, and finally the purpose of deviation correction is achieved.

[0033] The telescopic deviation-correcting drill bit with an auxiliary drilling function provided by the present invention realizes the preliminary crushing of the soil layer by arranging a cutting head 3 at the top end of the drill bit body 1 and assisting drilling through the spraying holes 6, and then it will be easier for the fixed cutter wings 2 to perform secondary crushing on the soil layer, improving the soil layer crushing efficiency; and a deviation-correcting assembly is connected to the rear end of the drill bit body 1. By driving the rotation between the outer sleeve 8 and the inner cylinder 11 by the paired electromagnets, an angle is formed between the axis of the drill pipe and the axis of the drill bit body 1 to achieve the purpose of correcting the deviation of the drill bit body 1, realizing timely deviation correction and reducing the deviation value of the drilled hole.

[0034] Optionally, the inner cylinder 11 and the fixed joint 7 can be realized through a rubber sleeve. One end of the rubber sleeve is connected to the lower end of the fixed joint 7, and the other end of the rubber sleeve is connected to the upper end of the inner cylinder 11. Both ends of the rubber sleeve are sealed to achieve the purpose of allowing water flow through.

[0035] Optionally, both the main electromagnet 12 and the secondary electromagnet 13 are connected to a power supply, and the power supply is a battery arranged in the annular adjustment space. The bottom and edge of the main electromagnet 12 are wrapped with an insulating layer.

[0036] In some possible embodiments, please refer toFigure 7 , there are two pairs of hinge shafts 21 in the annular adjustment space. The two pairs of hinge shafts 21 are longitudinally spaced apart, and the included angle between the longitudinal projections of any two pairs of hinge shafts 21 is a right angle; each pair of hinge shafts 21 is symmetrically arranged on both sides of the inner cylinder 11; the deviation correction assembly is located above the hinge shafts 21.

[0037] Two pairs of hinge shafts 21 are installed in the annular adjustment space. Each pair of hinge shafts 21 consists of two hinge shafts 21, and the two hinge shafts 21 are symmetrically arranged on both sides of the inner cylinder 11, and the two hinge shafts 21 are at the same height and coaxially arranged. There is a height difference between two adjacent hinge shafts 21. The four hinge shafts 21 include a first hinge shaft 21, a second hinge shaft 21, a third hinge shaft 21 and a fourth hinge shaft 21. Among them, the first hinge shaft 21 and the second hinge shaft 21 are paired, the first hinge shaft 21 and the second hinge shaft 21 are coaxially arranged on both sides of the inner cylinder 11, the third hinge shaft 21 and the fourth hinge shaft 21 are paired, and the third hinge shaft 21 and the fourth hinge shaft 21 are coaxially arranged on both sides of the inner cylinder 11; the included angle between the first hinge shaft 21 and the third hinge shaft 21 is 90 degrees, and the included angle between the first hinge shaft 21 and the fourth hinge shaft 21 is 90 degrees. And the first hinge shaft 21 is located below the third hinge shaft 21.

[0038] There are four groups of electromagnets, and the four groups of electromagnets correspond to the four hinge shafts 21 one by one, and the electromagnets are located above the hinge shafts 21.

[0039] In some possible embodiments, please refer to Figure 1 , a sealing groove is provided at the lower end of the fixed joint 7, and a sealing gasket 10 is provided at the bottom of the sealing groove; the upper end of the inner cylinder 11 extends into the sealing groove and abuts against the sealing gasket 10; the outer diameter of the inner cylinder 11 is smaller than the outer diameter of the sealing groove, and the inner diameter of the inner cylinder 11 is larger than the inner diameter of the sealing groove.

[0040] Specifically, the sealing gasket 10 is a flexible gasket with a certain elasticity. When none of the four groups of electromagnets is powered on, the upper end surface of the inner cylinder 11 fits on the sealing gasket 10. When any one group of electromagnets is powered on, rotation occurs between the inner cylinder 11 and the outer sleeve 8, and the upper end edge of the inner cylinder 11 presses the sealing gasket 10.

[0041] The sealing gasket 10 can be selected as a rubber gasket. There is a certain margin space on both the inner and outer sides of the inner cylinder 11 to adapt to the movement angle between the inner cylinder 11 and the outer sleeve 8.

[0042] Optionally, the sealing gasket 10 can also be selected as an elastic and water-insoluble polymer material.

[0043] In some possible embodiments, please refer to Figure 1, a first water channel 14 and a second water channel 15 are respectively provided in the fixed joint 7 and the inner cylinder 11, and the water flow channel 4, the first water channel 14 and the second water channel 15 are communicated in sequence. Under the action of the gasket 10, the first water channel 14 and the second water channel 15 are communicated.

[0044] A flexible sealing sleeve 9 is provided at the interface of the first water channel 14 and the second water channel 15, and the flexible sealing sleeve 9 is a rubber sleeve; rubber sleeves are also provided on the inner side walls of the inner cylinder 11 and the fixed joint 7, and the upper and lower ends of the rubber sleeves are respectively sealed and connected to the fixed joint 7 and the inner cylinder 11 to prevent water from overflowing.

[0045] In some possible embodiments, please refer to Figures 2 to 4 , a movable blade 16 is also slidably connected to the drill bit body 1; a longitudinal limiting groove is formed in the lower part of the drill bit body 1, the notch of the limiting groove faces outward, two side baffles 19 are provided at the notch of the limiting groove, and the two side baffles 19 are respectively attached to the two side walls of the limiting groove, and there is a first gap between the two side baffles 19; the lower end of the side baffle 19 is attached to the end of the limiting groove, and there is a second gap between the upper part of the baffle and the other end of the limiting groove; a slider adapted to the limiting groove is provided on the inner side of the movable blade 16, and the slider includes a fitting part 18 adapted to the limiting groove and an extension part connecting the fitting part 18 and the movable blade 16 through the first gap, and the height of the fitting part 18 is less than the height of the second gap; the extension part is located in the first gap and the two sides of the extension part are attached to the two side baffles 19.

[0046] A limiting groove is provided in the gap between two adjacent fixed blades 2 on the drill bit body 1, the length direction of the limiting groove is consistent with the axial direction of the drill bit body 1, and the depth direction of the limiting groove is consistent with the radial direction of the drill bit body 1. Two side baffles 19 are provided at the notch of the limiting groove, and the two side baffles 19 are used to cooperate with the limiting groove to prevent the fitting part 18 from disengaging from the limiting groove.

[0047] A second gap is left at the upper end of the limiting groove. During installation, first, the fitting part 18 is inserted into the limiting groove from the second gap, so that the extension part is located in the first gap. Since the width of the fitting part 18 is greater than the width of the first gap, the fitting part 18 is limited in the limiting groove by the side baffle 19.

[0048] When the fitting part 18 moves up and down along the length direction of the limiting groove, the movable blade 16 moves up and down to achieve the purpose of longitudinal adjustment.

[0049] Under different drilling methods, due to different frictional resistances and other reasons, the weight on bit (WOB) borne by the drill bit is different. During slide drilling, the WOB borne by the drill bit is small, and the pressure borne by the movable blade 16 is small, so the length that the movable blade 16 extends forward is relatively long; while during compound drilling, the WOB borne by the drill bit is large, and the pressure borne by the movable blade 16 is large, so the length that the movable blade 16 extends forward is relatively small. By changing the number of blades and the extending length of the movable blade 16 under different drilling methods, the working face stability and drilling efficiency are ensured.

[0050] Optionally, tension springs 20 are provided at both the upper end and the lower end of the fitting portion 18, and the tension springs 20 are used to reset the drill bit body 1.

[0051] A circular groove 22 for connecting the tension spring 20 is provided at the lower end of the limiting groove, and a guiding post extending downward is provided at the upper end of the limiting groove. The tension spring 20 is sleeved outside the guiding post.

[0052] In some possible embodiments, please refer to Figure 2 , a sliding connection groove is provided at the upper part of the drill bit body 1, a connecting portion is provided on the movable blade 16, and a reset spring 17 is longitudinally provided between the sliding connection groove and the connecting portion.

[0053] The upper part of the drill bit body 1 has a sliding connection groove. The side wall of the sliding connection groove is slidably connected to the connecting portion of the movable blade 16. A reset spring 17 is installed at the bottom of the sliding connection groove, and the upper end of the reset spring 17 is connected to the bottom end of the connecting portion.

[0054] Optionally, in the non-loaded state, the reset spring 17 exerts a forward thrust on the movable blade 16. During drilling, since the movable blade 16 retracts backward under the WOB, the elastic force of the reset spring 17 and the pressure on the movable blade 16 cancel each other out.

[0055] In some possible embodiments, please refer to Figure 2 , auxiliary water spray holes 23 are formed in the drill bit body 1, and the auxiliary water spray holes 23 communicate the water flow channel 4 and the lower part of the limiting groove.

[0056] The auxiliary water spray holes 23 communicate the water flow channel 4 and the lower part of the limiting groove. The water in the water flow channel 4 has a certain pressure. This water flow enters the limiting groove through the water spray holes 5, applies a certain pressure to the fitting portion 18 in the limiting groove, and makes the fitting portion 18 move upward, thereby achieving the purpose of adjusting the extension of the movable blade 16. The water entering the limiting groove will be discharged from the second gap and below the movable blade 16 to achieve the purpose of lubricating the surrounding soil layer.

[0057] At the same time, by adjusting the water pressure, the purpose of adjusting the extending length of the movable blade 16 can also be achieved.

[0058] In some possible embodiments, please refer toFigure 5 and Figure 6 , on one side of the water flow channel 4, an auxiliary water channel 24 is provided, and the auxiliary water channel 24 sequentially penetrates through the drill bit body 1, the fixed joint 7 and the outer sleeve 8. The end of the auxiliary water channel 24 is connected to the water passing hole on the side wall of the inner cylinder 11 by means of a hose.

[0059] The auxiliary water channel 24 sequentially penetrates through the drill bit body 1, the fixed joint 7 and the outer sleeve 8. The water outlet of the auxiliary water channel 24 is communicated with the lower part of the limiting groove, and the water inlet of the auxiliary water channel 24 is connected to the water passing hole on the side wall of the inner cylinder 11 by means of a hose.

[0060] A flow valve is arranged in the auxiliary water channel 24, and the flow valve adjusts the water flow rate of the auxiliary water channel 24 so as to achieve the effect of adjusting the water flow pressure of the auxiliary water channel 24.

[0061] An annular buffer water tank is arranged at the upper end of the outer sleeve 8, and the buffer water tank is communicated with the auxiliary water channel 24.

[0062] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Telescopic deviation-correcting bit with auxiliary drilling function, characterized in that Comprising: A drill bit body (1), on which a plurality of circumferentially arranged fixed cutter wings (2) are provided; a fixed joint (7) is connected to the lower end of the drill bit body (1); a water flow channel (4) is provided inside the drill bit body (1), and a plurality of water spray holes (5) communicating with the water flow channel (4) are provided on the drill bit body (1), and the plurality of water spray holes (5) and the plurality of fixed cutter wings (2) are alternately arranged; An auxiliary drilling structure, including a cutting head (3) provided at the top end of the drill bit body (1), the cutting head (3) is conical, and a spray hole (6) longitudinally opened is provided inside the cutting head (3), and the spray hole (6) communicates with the water flow channel (4); A deviation rectifying joint, including an outer sleeve (8), an inner cylinder (11) and a deviation rectifying component, the outer sleeve (8) is connected to the fixed joint (7), the upper end of the inner cylinder (11) is softly connected to the lower end of the fixed joint (7), and the lower end of the inner cylinder (11) is connected to a drill pipe; the outer sleeve (8) is hinged to the inner cylinder (11), and an annular adjustment space is provided between the outer sleeve (8) and the inner cylinder (11); the deviation rectifying component is located in the annular adjustment space, and the deviation rectifying component includes a plurality of main electromagnets (12) provided on the inner side wall of the outer sleeve (8) and a plurality of secondary electromagnets (13) provided on the outer side wall of the inner cylinder (11), and the main electromagnets (12) and the secondary electromagnets (13) are in one-to-one correspondence; An activity cutter wing (16) slidably connected is further provided on the drill bit body (1); a longitudinal limiting groove is opened in the lower part of the drill bit body (1), the notch of the limiting groove faces outwards, two side baffles (19) are provided at the notch of the limiting groove, the two side baffles (19) are respectively attached to the two side walls of the limiting groove, and a first gap is provided between the two side baffles (19).

2. The telescopic deviation correction bit with an auxiliary drilling function according to claim 1, wherein There are two pairs of hinge shafts (21) in the annular adjustment space, the two pairs of hinge shafts (21) are longitudinally spaced, and the included angle of the longitudinal projections of any two pairs of hinge shafts (21) is a right angle; each pair of hinge shafts (21) is symmetrically arranged on both sides of the inner cylinder (11); the deviation rectifying component is located above the hinge shafts (21).

3. The telescopic deviation-correcting drill bit with an auxiliary drilling function according to claim 1, characterized in that A sealing groove is provided at the lower end of the fixed joint (7), and a sealing gasket (10) is provided at the bottom of the sealing groove; the upper end of the inner cylinder (11) extends into the sealing groove and abuts against the sealing gasket (10); the outer diameter of the inner cylinder (11) is smaller than the outer diameter of the sealing groove, and the inner diameter of the inner cylinder (11) is larger than the inner diameter of the sealing groove.

4. The telescopic deviation-correcting drill bit with an auxiliary drilling function according to claim 1, wherein A first water channel (14) and a second water channel (15) are respectively provided in the fixed joint (7) and the inner cylinder (11), and the water flow channel (4), the first water channel (14) and the second water channel (15) are sequentially communicated.

5. The telescopic deviation rectifying drill bit with an auxiliary drilling function according to claim 4, characterized in that, A flexible sealing sleeve is provided at the interface of the first water channel (14) and the second water channel (15).

6. The telescopic deviation-correcting drill bit with an auxiliary drilling function according to claim 1, characterized in that, The lower end of the side baffle (19) is in contact with the end of the limiting groove, and there is a second gap between the upper part of the baffle and the other end of the limiting groove; a slider adapted to the limiting groove is provided inside the movable cutter blade (16), and the slider includes a fitting portion (18) adapted to the limiting groove and an extension portion that penetrates the first gap to connect the fitting portion (18) and the movable cutter blade (16), and the height of the fitting portion (18) is less than the height of the second gap; the extension portion is located in the first gap and both sides of the extension portion are in contact with the two side baffles (19).

7. The telescopic deviation rectifying drill bit with an auxiliary drilling function according to claim 6, characterized in that, A sliding connection groove is provided in the upper part of the drill bit body (1), a connection portion is provided on the movable cutter blade (16), and a return spring (17) is longitudinally provided between the sliding connection groove and the connection portion.

8. The telescopic deviation-correcting drill bit with an auxiliary drilling function according to claim 7, characterized in that, Auxiliary water spray holes are formed in the drill bit body (1), and the auxiliary water spray holes communicate the water flow channel (4) and the lower part of the limiting groove.

9. The telescopic deviation-correcting drill bit with an auxiliary drilling function according to claim 7, characterized in that, An auxiliary water channel (24) is provided on one side of the water flow channel (4), the auxiliary water channel (24) sequentially penetrates the drill bit body (1), the fixed joint (7) and the outer sleeve (8), and the end of the auxiliary water channel (24) is connected to a water passing hole on the side wall of the inner cylinder (11) by means of a hose.

10. The telescopic deviation-correcting drill bit with an auxiliary drilling function according to claim 9, characterized in that, An annular buffer water tank is provided at the upper end of the outer sleeve (8), and the buffer water tank is communicated with the auxiliary water channel (24).

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