Strong-stability and high-rock-breaking-efficiency drill bit matched with directional type guiding drilling tool

Abstract

The invention discloses a high-stability and high-rock-breaking-efficiency drill bit adaptive to a directional guide drilling tool, and belongs to the technical field of drilling engineering. The drill bit comprises an adapter substitute and a drill bit body which are coaxially and fixedly connected; the conversion joint comprises a first joint and a second joint which are fixedly connected; the drill bit body is provided with a plurality of rock breaking blades, and cutting teeth are arranged on the radial outer wall faces of the rock breaking blades. A sliding supporting wing is coaxially and rotationally matched with the radial outer end face of the second connector, a first drilling fluid flow channel is formed in the middle of the first connector, a second drilling fluid flow channel is formed in the middle of the second connector, a drill bit inner cavity is formed in the drill bit body, and a drill bit nozzle is arranged on the drill bit body. Through the radial outer end face structure arrangement of the sliding supporting wings and the rock breaking cutter wings and the multi-cutting-edge arrangement of the cutting teeth, ternary synchronous improvement of the drill bit track control capacity, the rock breaking drilling speed and the drill bit working life is achieved when the drill bit is used in cooperation with a directional type guiding drilling tool.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of drilling engineering, specifically to the field of directional drilling technology, and particularly relates to a strong-stability high rock-breaking-efficiency drill bit suitable for a directional drilling tool. BACKGROUND

[0002] Rotary steerable drilling technology is the most advanced directional drilling technology at present, and the core equipment thereof is a rotary steerable drilling tool. According to the difference in core mechanism for realizing trajectory control, the existing rotary steerable drilling tools are divided into two categories, namely, push-type rotary steerable drilling tools and directional rotary steerable drilling tools.

[0003] The representative push-type rotary steerable drilling tool (Rotary Steerable Systems, RSS for short) at present includes the Power Drive series developed by Schlumberger, the Auto Trak of Baker Hughes, the Geo-Pilot developed by Halliburton, the Welleader system of CNOOC, and the rotary guide developed by Sichuan Coking Drilling and China University of Petroleum (East China) and the like. This kind of rotary steerable drilling tool is very widely used in the field, but has problems of unstable trajectory control capability and low trajectory control capability when the drilling speed is fast.

[0004] The representative directional rotary steerable drilling tool at present includes the Geo-Pilot series of Halliburton Company and the TerraPointTM directional rotary steerable system of H&P Drilling Company of the United States and the like. The trajectory control capability of this kind of rotary steerable drilling tool is currently lower than that of the push-type rotary steerable drilling tool, but it is recognized because of the characteristics of stable trajectory control capability and non-reduction of trajectory control capability when the drilling speed is fast. Improving the performance and use effect of the directional rotary steerable drilling tool is a research hotspot in the field of drilling engineering at present.

[0005] When the directional rotary steerable drilling tool is used, in addition to the trajectory control capability to be improved, there is also the problem of unstable vibration of the downhole tool. The drill bit is a direct tool for forming a borehole, and its characteristics directly affect the use effect of the directional rotary steerable drilling tool. If a drill bit can be developed, which can not only improve the trajectory control capability of the directional rotary steerable drilling tool when used, but also strengthen the stability during drilling, then the wide popularization and application of the directional rotary steerable drilling tool is just around the corner.

[0006] Based on this, the application provides a strong-stability high rock-breaking-efficiency drill bit suitable for a directional drilling tool. SUMMARY

[0007] The present application aims to overcome the deficiencies of the prior art, and provide a strong stability and high rock breaking efficiency drill bit suitable for a pointing type steering drilling tool.

[0008] To achieve the above object, the present application adopts the following technical scheme:

[0009] A strong stability and high rock breaking efficiency drill bit suitable for a pointing type steering drilling tool, comprising a conversion joint and a drill bit body coaxially fixedly connected;

[0010] The conversion joint comprises a first joint and a second joint coaxially fixedly connected, and the second joint is located between the first joint and the drill bit body;

[0011] The drill bit body is uniformly provided with a plurality of rock breaking blades in the circumferential direction, and the radial outer wall surface of the rock breaking blade is provided with a cutting tooth;

[0012] The radial outer end surface of the second joint is coaxially rotationally connected with a sliding support wing, and the radial outer end surface of the sliding support wing is uniformly provided with a plurality of support protrusions in the circumferential direction; the radial outer end surface of the support protrusion is in a cylindrical structure, and the radial outer end surfaces of all the support protrusions in the sliding support wing are located on the same support cylindrical surface, and the central axis of the support cylindrical surface is consistent with the central axis of the drill bit body;

[0013] The central part of the first joint is provided with a first drilling fluid flow channel penetrating in the axial direction;

[0014] The central part of the second joint is provided with a second drilling fluid flow channel communicating with the first drilling fluid flow channel in the axial direction;

[0015] The drill bit body is internally provided with a drill bit inner cavity communicating with the second drilling fluid flow channel;

[0016] The drill bit body is provided with a drill bit nozzle, and the drill bit nozzle communicates with the drill bit inner cavity.

[0017] Preferably, the sliding support wing and the second joint are rotationally connected through a radial bearing.

[0018] Preferably, the radial outer end surface of the rock breaking blade comprises a gage up taper surface, a gage surface and an outer ring arc surface connected in sequence from the side wall of the drill bit body to the head end direction; the edge of the outer ring arc surface is inwardly recessed to form a stepped connecting surface, and the inner end of the stepped connecting surface is connected with an inner ring part extending towards the center of the drill bit body;

[0019] The gage surface is in a cylindrical structure, and the gage surfaces of all the rock breaking blades are located on the same gage cylindrical surface, and the central axis of the gage cylindrical surface is consistent with the central axis of the drill bit body;

[0020] The diameter of the supporting cylindrical surface is the same as the diameter of the retaining cylindrical surface.

[0021] Preferably, the stepped connecting surface has a cylindrical structure;

[0022] All the stepped connecting surfaces of the rock-breaking blades are located on the same axial cylindrical surface, and the central axis of the axial cylindrical surface is collinear with the central axis of the drill bit body.

[0023] Preferably, the inner ring portion is an inner conical surface with a conical structure, and the central axis of the conical surface containing the inner conical surface is collinear with the central axis of the drill bit body.

[0024] Preferably, the cutting teeth include outer ring cutting teeth and inner ring cutting teeth;

[0025] The outer ring arc surface is provided with a plurality of outer ring cutting teeth arranged along the generatrix direction, and the outer ring cutting teeth protrude outward from the outer ring arc surface;

[0026] The inner cone surface is provided with a plurality of inner ring cutting teeth arranged along the generatrix direction, and the inner ring cutting teeth protrude outward from the inner cone surface;

[0027] The diameter protection surface is embedded with several reinforcing teeth arranged along the generatrix direction.

[0028] Preferably, both the outer ring cutting teeth and the inner ring cutting teeth are multi-bladed PDC teeth. The tooth body of the multi-bladed PDC teeth is cylindrical, and the rock-breaking end of the multi-bladed PDC teeth includes several layers of cutting tooth surfaces distributed in a stepped manner, with each layer of cutting tooth surfaces being parallel to the others.

[0029] Preferably, the back tilt angle of the cutting teeth on the rock-breaking blade gradually increases along the generatrix direction in the order of the inner conical surface and the diameter-maintaining surface.

[0030] Preferably, the drill bit nozzle includes an inner edge nozzle disposed on the drill bit body between adjacent rock-breaking blades and an outer edge nozzle disposed on the rock-breaking blades;

[0031] The inner edge nozzle is connected to the inner cavity of the drill bit through the inner edge flow channel, and the outer edge nozzle is connected to the inner cavity of the drill bit through the outer edge flow channel.

[0032] The beneficial effects of this invention are:

[0033] (1) The present invention achieves a three-dimensional simultaneous improvement in drill bit trajectory control capability, rock breaking drilling speed, and drill bit working life when used in conjunction with a directional drilling tool by setting the sliding support wing, the radial outer end face structure of the rock breaking blade wing, and the multi-blade setting of the cutting teeth.

[0034] (2) By setting up a sliding support wing, the present invention allows the sliding support wing to contact the well wall during the drilling process without rotating with the drill bit, thus playing a supporting role. The second joint drives the drill bit body to rotate, thereby avoiding the drawback of the rotating drilling tool contacting the well wall during the drilling process in the prior art, thereby improving the phenomenon of drill bit rock breaking and unstable vibration, and ensuring the directional drilling capability.

[0035] (3) The concave stepped connecting surface and the inner ring cutting teeth on the conical surface of the present invention form a concave cylindrical area in the concave region at the tip of the drill bit body. During the drilling process, a "rock column" will be formed in the concave cylindrical area. When the formation is encountered, the outer ring cutting teeth on the outer ring arc surface first break the rock at the bottom of the well. The "rock column" formed in the center effectively releases the stress at the bottom of the well. The "rock column" part forms a stress unloading area, which can effectively prevent the occurrence of "core removal". The inner ring cutting teeth on the inner conical surface break the middle "rock column". Compared with conventional drill bits without concave areas, the drill bit structure of the present invention greatly reduces the difficulty of breaking the rock in the center, thereby improving the drilling speed.

[0036] (4) The multi-layer cutting tooth surface of the cutting tooth in this invention improves the service life of the tooth and thus improves the life of the drill bit. Attached Figure Description

[0037] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0038] Figure 1 This is a schematic diagram of the structure of the highly stable and high rock-breaking efficiency drill bit adapted to directional drilling tools according to the present invention;

[0039] Figure 2 This is a radial sectional view of the sliding support wing in this invention;

[0040] Figure 3 This is a schematic diagram of the structure of the multi-blade PDC tooth when the cutting tooth surface is planar in this invention;

[0041] Figure 4 This is a schematic diagram of the structure of the multi-blade PDC tooth when the cutting tooth surface is a conical surface in this invention;

[0042] Figure 5 This is a schematic diagram of the structure of the multi-blade PDC tooth when the cutting tooth surface is a pyramidal surface in this invention;

[0043] in:

[0044] 1-Adapter joint, 11-First joint, 111-First drilling fluid flow channel, 12-Second joint, 121-Second drilling fluid flow channel;

[0045] 2-Drill bit body, 201-Drill bit inner cavity;

[0046] 3-Rock-breaking blade wing, 301-Upper conical surface for diameter protection, 302-Diameter protection surface, 303-Outer annular arc surface, 304-Inner conical surface, 305-Stepped connection surface;

[0047] 4-Outer ring cutting teeth, 401-Circular plane, 402-Annular plane, 403-Conical surface, 404-Annular conical surface, 405-Pyramidal surface, 406-Annular pyramidal surface;

[0048] 5-Reinforcing teeth;

[0049] 6-Inner ring cutting teeth;

[0050] 7-Inner edge nozzle, 701-Inner edge flow channel;

[0051] 8 - Outer edge nozzle, 801 - Outer edge flow channel;

[0052] 9-Sliding support wing, 901-Support protrusion, 902-Radial bearing, 903-Thrust bearing. Detailed Implementation

[0053] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0054] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0055] In this invention, terms such as "connected" and "linked" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can determine the specific meaning of these terms in this invention based on the specific circumstances, and they should not be construed as limitations on the invention.

[0056] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0057] likeFigure 1 As shown, a high-stability, high-rock-breaking-efficiency drill bit adapted to a directional drilling tool includes a coaxially fixed adapter 1 and a drill bit body 2.

[0058] The adapter 1 includes a first connector 11 and a second connector 12 that are coaxially fixedly connected, with the second connector 12 located between the first connector 11 and the drill bit body 2.

[0059] The drill bit body 2 is provided with a plurality of rock-breaking blades 3 evenly arranged along the circumferential direction, and cutting teeth are provided on the radial outer wall surface of the rock-breaking blades 3.

[0060] The second connector 12 has a sliding support wing 9 coaxially rotatably fitted on its radial outer end face. The sliding support wing 9 has a plurality of support protrusions 901 evenly arranged along the circumferential direction on its radial outer end face. The radial outer end face of the support protrusion 901 has a cylindrical structure and all the radial outer end faces of the support protrusions 901 in the sliding support wing 9 are located on the same support cylindrical surface. The central axis of the support cylindrical surface is consistent with the central axis of the drill bit body 2.

[0061] The first joint 11 has a through first drilling fluid channel 111 in the middle part along the axial direction;

[0062] The second joint 12 has a second drilling fluid channel 121 connected to the first drilling fluid channel 111 along the axial direction at its middle part;

[0063] The drill bit body 2 is provided with a drill bit cavity 201 that communicates with the second drilling fluid flow channel 121;

[0064] The drill bit body 2 is provided with a drill bit nozzle, which is connected to the drill bit inner cavity 201.

[0065] Preferably, the sliding support wing 9 and the second joint 12 are rotatably engaged by a radial bearing 902.

[0066] Specifically, a thrust bearing 903 is provided between one axial end face of the sliding support wing 9 and the shoulder end face of the second connector 12, and a thrust bearing 903 is also provided between the other axial end face of the sliding support wing 9 and the axial end face of the first connector 11.

[0067] Specifically, the sliding support wing 9 and the second joint 12 can rotate relative to each other, but cannot slide axially.

[0068] Preferably, the radial outer end face of the rock-breaking blade 3 includes a gauge-maintaining upper conical surface 301, a gauge-maintaining surface 302, and an outer annular arc surface 303 connected sequentially from the side wall of the drill bit body 2 toward the head end; the edge of the outer annular arc surface 303 is recessed inward in a stepped manner to form a stepped connecting surface 305, and the inner end of the stepped connecting surface 305 is connected to the inner ring portion extending toward the center of the drill bit body 2;

[0069] The gauge protection surface 302 has a cylindrical structure and all the gauge protection surfaces 302 of the rock breaking blades 3 are located on the same gauge protection cylindrical surface. The central axis of the gauge protection cylindrical surface is consistent with the central axis of the drill bit body 2.

[0070] The diameter of the supporting cylindrical surface is the same as the diameter of the retaining cylindrical surface.

[0071] Preferably, the stepped connecting surface 305 has a cylindrical structure;

[0072] All the stepped connecting surfaces 305 of the rock-breaking blades 3 are located on the same axial cylindrical surface, and the central axis of the axial cylindrical surface is collinear with the central axis of the drill bit body 2.

[0073] In this application, the stepped connecting surface 305 can also be a stepped cylindrical structure. The cylindrical structures located at the same axial position in the stepped connecting surfaces 305 of all rock-breaking blades 3 are located on the same axial cylindrical surface, and the central axis of the axial cylindrical surface is collinear with the central axis of the drill bit body 2.

[0074] Preferably, the inner ring portion is an inner conical surface 304 with a conical structure, and the central axis of the conical surface where the inner conical surface 304 is located is collinear with the central axis of the drill bit body 2.

[0075] The vertex of the conical surface containing the inner conical surface 304 can extend into the interior of the drill bit body 2, making the inner conical surface 304 a concave conical surface, such as... Figure 1 As shown;

[0076] The vertex of the conical surface where the inner conical surface 304 is located can also extend to the outside of the drill bit body 2, so that the inner conical surface 304 forms an externally convex conical surface.

[0077] Preferably, the cutting teeth include outer ring cutting teeth 4 and inner ring cutting teeth 6;

[0078] The outer ring arc surface 303 is provided with a plurality of outer ring cutting teeth 4 arranged along the generatrix direction, and the outer ring cutting teeth 4 protrude outward from the outer ring arc surface 303;

[0079] The inner conical surface 304 is provided with a plurality of inner ring cutting teeth 6 arranged along the generatrix direction, and the inner ring cutting teeth 6 protrude outward from the inner conical surface 304;

[0080] The diameter-protecting surface 302 is embedded with a plurality of reinforcing teeth 5 arranged along the generatrix direction. The reinforcing teeth 5 in this application are trimmed during installation.

[0081] Preferably, the outer ring cutting tooth 4 and the inner ring cutting tooth 6 are both multi-bladed PDC teeth. The tooth body of the multi-bladed PDC tooth is cylindrical, and the rock-breaking end of the multi-bladed PDC tooth includes several layers of cutting tooth surfaces distributed in a stepped manner, with each layer of cutting tooth surfaces being parallel to the others.

[0082] Specifically, the outer ring cutting teeth 4 and the inner ring cutting teeth 6 of this application are not trimmed when installed on the drill bit.

[0083] In use, the cutting tooth surface at the very front of the center first contacts the rock and performs the cutting action; when the rock is too hard or after a period of use, the cutting tooth surface in the center is damaged and loses its cutting action, at which point the next layer of cutting tooth surfaces will take over the cutting action. Compared with existing cutting teeth that only have a single layer of cutting tooth surfaces, the outer ring cutting tooth 4 and inner ring cutting tooth 6 of this application improve the service life of the teeth.

[0084] The cutting tooth surface can be a plane, a cone, or a pyramid, or it can be other shapes.

[0085] Specifically, such as Figure 3 As shown, the cutting tooth surface is a plane, the cutting tooth surface at the very beginning located at the center is a circular plane 401, and the remaining step-shaped cutting tooth surfaces are annular planes 402.

[0086] Specifically, such as Figure 4 As shown, the cutting tooth surface is a conical surface. The cutting tooth surface at the very beginning of the center includes two intersecting conical surfaces 403, and the remaining stepped cutting tooth surfaces are annular conical surfaces 404.

[0087] Specifically, such as Figure 5 As shown, the cutting tooth surface is a pyramidal surface. The cutting tooth surface at the very front of the center includes several pyramidal surfaces 405 intersecting at a single point. The remaining stepped cutting tooth surfaces are annular pyramidal surfaces 406. The extended surfaces of the same layer of annular pyramidal surfaces 406 also intersect at a single point. The points where the pyramidal surfaces 405 and the annular pyramidal surfaces 406 intersect are all located on the central axis of the cutting tooth 4. The structure when the cutting tooth surface at the very front of the center includes three pyramidal surfaces 405 is as follows: Figure 5 As shown, it may also include other numbers of pyramidal faces, which will not be listed here.

[0088] Specifically, the height difference between adjacent cutting tooth surfaces along the axial direction of the tooth end is 0.01mm-3mm; the annular width of the cutting tooth surface with an annular structure along the radial direction of the tooth end is 0.01mm-3mm.

[0089] Preferably, the back slope angle of the cutting teeth on the rock-breaking blade 3 gradually increases along the generatrix direction in the order of the inner conical surface 304 and the diameter-maintaining surface 302; the back slope angle range of the cutting teeth is 5° to 35°. The back slope angle setting in this application can both improve the drilling speed of the drill bit and reduce the circumferential vibration of the drill bit during the drilling process. The back slope angle of the cutting teeth refers to the angle between the working surface of the cutting teeth and the outer normal of the bottom rock surface.

[0090] Preferably, the drill bit nozzles include an inner edge nozzle 7 disposed on the drill bit body 2 between adjacent rock-breaking blades 3 and an outer edge nozzle 8 disposed on the rock-breaking blades 3;

[0091] The inner edge nozzle 7 is connected to the drill bit cavity 201 through the inner edge flow channel 701, and the outer edge nozzle 8 is connected to the drill bit cavity 201 through the outer edge flow channel 801.

[0092] The inner nozzle 7 can clean the inner ring cutting teeth 6 on the inner conical surface 304, while the outer nozzle 8 is directly facing the adjacent rock-breaking blade 3 and the outer ring cutting teeth 4 on it. The inner nozzle 7 and the outer nozzle 8 work together to ensure that the drilling fluid sprayed from the nozzle can effectively clean and cool the cutting teeth in the main rock-breaking parts, avoiding repeated crushing caused by the accumulation of rock cuttings.

[0093] Existing conventional drill bits do not feature the sliding support wing 9 described in this application. During use, the rotating drilling tool contacts the wellbore during drilling, causing vibrations and high friction, leading to rock-breaking instability, axis instability, and low directional drilling capability, significantly impacting subsequent drilling and completion operations. This invention addresses this issue by incorporating the sliding support wing 9. During drilling, the sliding support wing 9 contacts the wellbore without rotating with the drill bit, providing support. The second connector 12 drives the drill bit body 2 to rotate, thus avoiding the drawbacks of the rotating drilling tool contacting the wellbore during drilling in the prior art. This improves the rock-breaking instability and ensures directional drilling capability.

[0094] In this invention, the sliding support wing 9, the radial outer end face structure of the rock-breaking blade 3, the protruding blade wall surface of the cutting teeth, and the multi-blade configuration ensure that during drilling, the sliding support wing 9 does not have the ability to cut the well wall, and its outer edge supports the lower well wall. When the drill collar applies drilling pressure to the drill bit, it allows the drill bit to drill along the direction the drill bit points. The sliding support wing 9 can also reduce torsional vibration when used with a directional rotary drilling tool. The diameter-protecting surface 303 on the outer end face of the rock-breaking blade 3 is used to enhance the axial cutting effect of the drill bit under the same drilling pressure. The multi-blade configuration ensures that the cutting teeth have continuous rock-breaking ability. The above comprehensive configuration can maintain the drill bit with strong stability, trajectory control ability, and drilling speed.

[0095] The recessed stepped connecting surface 305 and the inner ring cutting teeth 6 on the conical surface 304 of this invention form a recessed cylindrical area in the recessed region at the head end of the drill bit body 2. During drilling through the formation, a "rock column" will form in this recessed cylindrical area. When drilling through the formation, the outer ring cutting teeth 4 on the outer ring arc surface 303 first break the rock at the bottom of the well. The "rock column" formed in the center effectively releases the stress at the bottom of the well. The "rock column" area forms a stress unloading area, which can effectively prevent the occurrence of "core removal". The inner ring cutting teeth 6 on the inner conical surface 304 break the middle "rock column". Compared with conventional drill bits without a recessed area, the drill bit structure of this invention greatly reduces the difficulty of breaking the rock in the center, thereby improving the drilling speed.

[0096] In this invention, the cutting teeth feature a multi-layered cutting tooth surface configuration. During use, the central, outermost cutting tooth surface initially contacts the rock and performs the cutting action. When the rock becomes too hard or after a period of use, the central cutting tooth surface may become damaged and lose its cutting function. At this point, the next layer of cutting tooth surfaces will then take over the cutting action. Compared to existing cutting teeth with only a single layer of cutting tooth surfaces, the cutting teeth configuration of this application improves the service life of the teeth.

[0097] In summary, this invention, through the radial outer end face structure of the sliding support wing 9, the rock-breaking blade wing 3, and the multi-blade setting of the cutting teeth, achieves a three-dimensional simultaneous improvement in drill bit trajectory control capability, rock-breaking drilling speed, and drill bit working life when used in conjunction with directional steerable drilling tools. This provides support for further enhancing the application effect of directional rotary steerable drilling tools and supports the advancement of the exploration and development of deep, ultra-deep, and extra-ultra-deep geological resources.

[0098] This application describes a high-stability, high-rock-breaking-efficiency drill bit suitable for directional drilling tools. It can be adapted to directional rotary directional drilling tools, curved-shell screw drills, curved-shell turbine drills, and other directional tools that use the directional drilling principle to control the trajectory.

[0099] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, they are not intended to limit the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A high-stability, high-rock-breaking-efficiency drill bit adapted to directional drilling tools, comprising a coaxially fixedly connected adapter and a drill bit body; characterized in that, The adapter includes a first connector and a second connector that are coaxially fixedly connected, with the second connector located between the first connector and the drill bit body; The drill bit body is uniformly provided with a number of rock-breaking blades along the circumferential direction, and cutting teeth are provided on the radial outer wall surface of the rock-breaking blades; The second connector has a sliding support wing that is rotatably fitted on its radial outer end face. The sliding support wing has several support protrusions evenly arranged along the circumferential direction on its radial outer end face. The radial outer end face of the support protrusion has a cylindrical structure and all the radial outer end faces of the support protrusions in the sliding support wing are located on the same support cylindrical surface. The central axis of the support cylindrical surface is consistent with the central axis of the drill bit body. The first joint has a through-hole drilling fluid flow channel in the middle along the axial direction; The second joint has a second drilling fluid channel connected to the first drilling fluid channel along the axial direction in the middle part; The drill bit body has an internal cavity that communicates with the second drilling fluid flow channel. The drill bit body is provided with a drill bit nozzle, which is connected to the inner cavity of the drill bit.

2. The high-stability, high-rock-breaking-efficiency drill bit adapted to directional drilling tools as described in claim 1, characterized in that, The sliding support wing and the second joint are rotated together via a radial bearing.

3. The high-stability, high-rock-breaking-efficiency drill bit adapted to directional drilling tools as described in claim 1, characterized in that, The radial outer end face of the rock-breaking blade includes a gauge-maintaining upper conical surface, a gauge-maintaining surface, and an outer annular arc surface that are sequentially connected from the drill bit body sidewall toward the head end; the edge of the outer annular arc surface is recessed inward in a stepped manner to form a stepped connecting surface, and the inner end of the stepped connecting surface is connected to the inner ring portion extending toward the center of the drill bit body. The gauge protection surface has a cylindrical structure and all the gauge protection surfaces of the rock-breaking blades are located on the same gauge protection cylindrical surface. The central axis of the gauge protection cylindrical surface is consistent with the central axis of the drill bit body. The diameter of the supporting cylindrical surface is the same as the diameter of the retaining cylindrical surface.

4. The high-stability, high-rock-breaking-efficiency drill bit adapted to directional drilling tools as described in claim 3, characterized in that, The stepped connection surface has a cylindrical structure; All the stepped connecting surfaces of the rock-breaking blades are located on the same axial cylindrical surface, and the central axis of the axial cylindrical surface is collinear with the central axis of the drill bit body.

5. The high-stability, high-rock-breaking-efficiency drill bit adapted to directional drilling tools as described in claim 3, characterized in that, The inner ring is an inner conical surface with a conical structure, and the central axis of the conical surface containing the inner conical surface is collinear with the central axis of the drill bit body.

6. The high-stability, high-rock-breaking-efficiency drill bit adapted to directional drilling tools as described in claim 5, characterized in that, The cutting teeth include outer ring cutting teeth and inner ring cutting teeth; The outer ring arc surface is provided with a plurality of outer ring cutting teeth arranged along the generatrix direction, and the outer ring cutting teeth protrude outward from the outer ring arc surface; The inner cone surface is provided with a plurality of inner ring cutting teeth arranged along the generatrix direction, and the inner ring cutting teeth protrude outward from the inner cone surface; The diameter protection surface is embedded with several reinforcing teeth arranged along the generatrix direction.

7. The high-stability, high-rock-breaking-efficiency drill bit adapted to directional drilling tools as described in claim 6, characterized in that, Both the outer ring cutting teeth and the inner ring cutting teeth are multi-bladed PDC teeth. The tooth body of the multi-bladed PDC teeth is cylindrical at the end. The rock-breaking end of the multi-bladed PDC teeth includes several layers of cutting tooth surfaces distributed in a stepped manner, with each layer of cutting tooth surfaces being parallel to the others.

8. The high-stability, high-rock-breaking-efficiency drill bit adapted to directional drilling tools as described in claim 5, characterized in that, The back tilt angle of the cutting teeth on the rock-breaking blade gradually increases along the generatrix direction in the order of inner conical surface and diameter-preserving surface.

9. The high-stability, high-rock-breaking-efficiency drill bit adapted to directional drilling tools as described in claim 1, characterized in that, The drill bit nozzles include an inner edge nozzle disposed on the drill bit body between adjacent rock-breaking blades and an outer edge nozzle disposed on the rock-breaking blades. The inner edge nozzle is connected to the inner cavity of the drill bit through the inner edge flow channel, and the outer edge nozzle is connected to the inner cavity of the drill bit through the outer edge flow channel.

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