A self-stabilizing drill bit with reduced rock breaking energy and an optimal design method thereof

Abstract

The present application provides a self-stabilizing drill bit with reduced rock breaking energy, which adopts an integrated overall structure and comprises: an advanced drill bit in a columnar self-spiral structure to break rock in a strong self-sharpening manner; and a rear drill bit with a gradual change design at the transition part of the advanced drill bit to achieve a stepped rock breaking effect. The present application has the following beneficial effects: a stepped drill bit design layout is adopted to optimize the drill bit feeding mode, a self-sharpening cutter selection and arrangement mode is adopted to change the rock breaking sequence and optimize the utilization of rock breaking energy, and the energy required for rock breaking can be maximally reduced. Meanwhile, the split size design also has a strong self-righting and vibration reduction stabilizing effect, and maximally increases the area requiring rock breaking. Moreover, the self-sharpening effect of the drill bit also effectively guarantees the realization of the mechanical drilling speed and drilling footage target.

Description

Technical Field

[0001] This invention relates to the field of petroleum exploration and development technology, and more specifically, to a self-stabilizing drill bit that reduces rock-breaking energy and a drill bit optimization design method. Background Technology

[0002] The development of oil drilling technology is a process driven by innovation in rotary drilling, breakthroughs in PDC (Power Distribution Center) combined with screw drilling, and supported by the comprehensive use of various speed-up tools and optimization technologies. In actual drilling operations, drill bits are designed with varying degrees of aggression or wear resistance depending on the formation, while their working conditions are modified to enhance rock-breaking efficiency and prevent premature failure. In rotary drilling, rock-breaking energy increases with the linear velocity relative to the center point as the drill bit rotates outwards from its central axis. However, the rock-breaking energy at the drill bit's center point is theoretically and practically minimal, and the rock-breaking efficiency at the center of the broken rock significantly impacts the overall rock-breaking efficiency of the drill bit.

[0003] To address the problems of existing technologies, this invention provides a self-stabilizing drill bit that reduces rock-breaking energy and a drill bit optimization design method. Summary of the Invention

[0004] To address the problems of the prior art, the present invention provides a self-stabilizing drill bit that reduces rock-breaking energy. The drill bit adopts an integrated, one-piece structure and includes:

[0005] Advanced drill bits, which have a cylindrical self-helical structure, move teeth in a strong self-sharpening manner;

[0006] The transition section between the rear drill bit and the advanced drill bit adopts a gradual design to achieve a stepped rock-breaking effect.

[0007] According to one embodiment of the present invention, the lower third portion of the drill bit assembly is the advanced drill bit, and the upper two-thirds portion of the drill bit assembly is the rear drill bit, wherein the diameter and height of the advanced drill bit are half the diameter and height of the rear drill bit.

[0008] According to one embodiment of the present invention, the advanced drill bit adopts an eccentric design, and the central axes of the advanced drill bit and the follower drill bit are not on the same straight line.

[0009] According to one embodiment of the present invention, the advanced drill bit is cylindrical, with a 120-degree "cross" cutting edge at its lower end, and teeth arranged thereon.

[0010] According to one embodiment of the present invention, the advanced drill bit has a double-helix toothed "ribbed" and a double-helix chip removal groove. The helix starts from the bottom and spirals upward in a right direction. The end point of the helix is ​​at the transition part between the advanced drill bit and the rear drill bit, and the start point and end point of the helix are in a 180-degree direction.

[0011] According to one embodiment of the present invention, the teeth are self-sharpened in a manner that satisfies the following condition: when the teeth on the advanced drill bit are worn to a certain extent, new teeth are broken off to achieve a self-sharpening effect.

[0012] According to one embodiment of the present invention, the teeth are prepared in a strong self-sharpening manner to satisfy the following condition: the teeth on the advanced drill bit are splintered under the impact of drilling, thereby producing new self-sharpening teeth.

[0013] According to one embodiment of the present invention, the tooth-laying method satisfies the following: the tooth-laying method is self-sharpening, and the tooth-laying method is "hidden tooth" to change the initial stress state of the teeth, so that after the teeth with high initial stress wear down or break, the teeth with low initial stress begin to be subjected to high load to break rocks.

[0014] According to one embodiment of the present invention, the rear drill bit has an extended water inlet, which, based on jet action, promotes cleaning, lubrication and cooling of the advanced drill bit, and avoids sand jamming and repeated breakage of the advanced drill bit.

[0015] According to another aspect of the present invention, a drill bit optimization design method for steadily reducing rock-breaking energy is also provided, the method comprising the following steps:

[0016] Determine the overall structure of the drill bit and specify the dimensions of the advanced drill bit and the rear drill bit;

[0017] With the goal of enhancing self-sharpening ability and improving rock-breaking capability, the structural shape, tooth selection and tooth arrangement of the advanced drill bit are optimized.

[0018] Based on the principle of stepped rock breaking, the transition section between the advanced drill bit and the subsequent drill bit is optimized to obtain a self-stabilizing drill bit that reduces rock breaking energy as described in any of the above items.

[0019] The present invention provides a self-stabilizing drill bit and a drill bit optimization design method for reducing rock-breaking energy, which has the following beneficial effects: It adopts a stepped drill bit design layout, optimizes the drill bit's feeding method, and employs self-sharpening tooth selection and placement to change the rock-breaking sequence and optimize the utilization of rock-breaking energy, thereby minimizing the energy required for rock breaking. Simultaneously, the split-size design also has strong self-aligning and vibration-reducing stabilizing effects, and maximizes the area to be broken. Furthermore, the drill bit's self-sharpening effect effectively ensures the achievement of mechanical drilling speed and drilling footage targets.

[0020] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 A schematic diagram of a self-stabilizing drill bit for reducing rock-breaking energy according to an embodiment of the present invention is shown; and

[0023] Figure 2 A flowchart of a drill bit optimization design method for steadily reducing rock-breaking energy according to an embodiment of the present invention is shown.

[0024] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not drawn to scale.

[0025] The meanings of the reference numerals in the attached figures are as follows: 1. The bottom of the slightly eccentric "point" or "cross" shape; 2. The self-helical toothed "rib" row; 3. The advanced drill bit column; 4. The diameter transition zone; 5. The rearward drill bit body. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0027] Existing technology (CN201620174218.3) proposes a novel oil drill bit, including a connector. A main drill bit is located at the bottom of the connector. The main drill bit has a vertically extending through-hole with a square horizontal cross-section. A hydraulic cylinder and a square base are respectively installed within the through-hole. The hydraulic cylinder is fixedly located at the bottom of the connector. The top of the square base is connected to the bottom of a piston rod. A guide drill bit is also fixedly installed at the bottom of the square base. Left and right support rods are respectively located on the left and right sides of the main drill bit. The bottom ends of the left and right support rods are hinged to the left and right side walls of the main drill bit, respectively. A left spring connects the top of the left support rod to the left side wall of the main drill bit, and a right spring connects the top of the right support rod to the right side wall of the main drill bit. Auxiliary drill bits are also located at the top of the left and right support rods. However, due to the use of hinges, the drill bit's strength is limited.

[0028] Existing technology (CN201721012365.1) proposes a drill bit that can improve the chip removal efficiency of the drill bit core, relating to the field of oil drilling tools technology. It includes a drill bit body, cutting edges, and nozzles for injecting drilling fluid. The drill bit body core has a chip removal channel and several chip suction channels connected to the chip removal channel. The angle between the outlet flow line of the chip removal channel and the outlet flow line of the chip suction channels is acute. The end of the chip suction channel used for suctioning rock cuttings is equipped with a negative pressure suction nozzle. The angle between the central axis of the negative pressure suction nozzle and the central axis of the drill bit is 15° to 45°. However, this existing drill bit lacks the modular dimensions of a one-piece drill bit, cannot balance strength and self-sharpening, and is deficient in self-alignment and vibration reduction stability.

[0029] The prior art (CN200620147927.9) proposes a drilling tool for breaking rocks in drilling, namely a rotary self-sharpening drill bit, which mainly consists of a drill bit body (1), a lower drill bit body (2), cutter wings (3), cutting teeth (4), water inlet (5), and a fixing tie (6). The tooth arrangement structure of this drill bit has self-sharpening characteristics, and the structure also adopts a self-sharpening tooth arrangement method. The cutting teeth and the cutter wings are fixed together by the fixing tie. However, due to the presence of the fixing tie, the overall strength of this prior art drill bit is reduced; it only adopts the self-sharpening method of tooth arrangement, without considering self-sharpening in the tooth selection.

[0030] Existing technology (CN201120428264.9) proposes a fixed-cutting-tooth drill bit, belonging to the field of rock-breaking tools for drilling equipment in oil and gas, mining engineering, building foundation engineering, geology, and hydrology. It includes a drill bit body and cutting teeth, wherein the cutting teeth are composed of base teeth and overlapping teeth. The base teeth are fixed to the drill bit body and have grooves matching the shape of the overlapping teeth. Part or all of the base teeth protrude beyond the surface of the drill bit crown. The overlapping teeth are fixed outwards relative to the drill bit body in the grooves of the base teeth. The total height of the overlapping tooth structure formed by the overlapping teeth and base teeth is greater than the theoretical height of the base teeth. However, this existing technology does not consider the form of the self-sharpening and sand-removing chip flutes of the drill bit, nor does it specify the drill bit strength requirements.

[0031] Existing technology (CN201120234227.4) proposes a drill bit with an internal groove coating to strengthen the drill tooth. The technical solution involves a tooth head on the upper part of the tooth body, a tooth crown at the top of the tooth body, and internal grooves radially formed on the conical surface of the tooth head. A diamond coating is applied to the outer edge of the tooth crown and the interior of the internal grooves. The cross-sectional shape of the internal grooves is arc-shaped, V-shaped, U-shaped, or semi-elliptical. However, this existing technology only provides the tooth with good cutting and self-sharpening functions through the manufacturing process; it does not provide the self-sharpening function through the tooth arrangement method, thus failing to fully utilize the tooth's inherent self-sharpening properties.

[0032] Existing technology (CN201420479813.9) discloses a self-traction hose assembly for horizontal branch jet drilling, including a jetting bit, a displacement sensor, and a hose. The jetting bit is mounted at the end of the hose, and its front end has a main jetting hole for breaking rock in the drilling direction. The jetting bit also has multiple auxiliary jetting holes and multiple secondary jetting holes evenly arranged circumferentially along its circumference. The secondary jetting holes are oriented at an acute angle to the jetting bit's forward direction, and the auxiliary jetting holes are oriented at an obtuse angle to the jetting bit's forward direction. The hose consists of three layers from the outside in: a wire braided layer, a communication layer, and an inner rubber layer. The displacement sensor is mounted on the jetting bit and connected to the wellhead via the communication layer. However, this existing technology is suitable for horizontal wells and requires specific supporting infrastructure, thus limiting its application.

[0033] Existing technology (CN85100739.2) proposes a novel composite tooth made by directly brazing or embedding polycrystalline diamond of different shapes and thicknesses onto a hard material support. These teeth can be used as cutting edges in various drilling tools for oil, coal, mining, and geology. The tooth shape can be designed according to rock morphology. Drill bits made with these teeth have good self-sharpening properties, can self-grind to a suitable shape, have long lifespan, and high drilling speed. These teeth also have high heat resistance and can be manufactured using existing diamond drill bit sintering processes. However, this existing technology only describes the self-sharpening property of the teeth from the perspective of tooth selection, without addressing the self-sharpening property of the tooth layout.

[0034] Figure 1 A schematic diagram of a self-stabilizing drill bit that reduces rock-breaking energy according to an embodiment of the present invention is shown.

[0035] like Figure 1 As shown, the drill bit adopts an integrated, one-piece structure, including an advanced drill bit and a follow-up drill bit. The advanced drill bit is a cylindrical, self-helical structure that uses a strong, self-sharpening method for tooth movement; the transition between the follow-up drill bit and the advanced drill bit adopts a gradual design to achieve a stepped rock-breaking effect.

[0036] In one embodiment, from the perspective of the overall design of the drill bit and the size design of the advanced drill bit and the follower drill bit, the drill bit is a whole, but in terms of size it is divided into an advanced drill bit part and a follower drill bit part. The lower third of the overall drill bit is the advanced drill bit, and the upper two-thirds of the overall drill bit is the follower drill bit. The diameter and height of the advanced drill bit are half the diameter and height of the follower drill bit.

[0037] Furthermore, the diameter transition between the advanced and rear drill bits should not involve abrupt changes in size; a gradual diameter transition is more conducive to increasing the strength of the transition section. The rear drill bit adopts a cylindrical shape design, but uses a self-sharpening method in tooth selection and placement. Due to the different dimensions of the two parts, the drill bit provided by this invention produces a stepped rock-breaking effect, optimizing the overall rock-breaking efficiency of the drill bit. The cylindrical design of the advanced drill bit and the diameter transition section can meet the initial impact requirements during rock breaking, and have the characteristics of high strength and strong impact resistance.

[0038] In one embodiment, the advanced drill bit is cylindrical with a 120-degree "cross"-shaped cutting edge at its lower end, on which teeth are arranged. Specifically, the 120-degree "cross"-shaped cutting edge at the lower end of the advanced drill bit is more conducive to cutting into and breaking rocks.

[0039] In one embodiment, the advanced drill bit features a double-helix tooth arrangement "rib" and a double-helix chip removal groove (the chip removal groove is located between the helical tooth arrangement "ribs"). The helix starts from the bottom and spirals upwards to the right, ending at the transition section between the advanced and follower drill bits. The start and end points of the helix are 180 degrees apart. Specifically, the double-helix chip removal groove facilitates sand removal and lifting, while also facilitating the cleaning, cooling, and lubrication of the advanced drill bit by the drilling fluid. The double-helix "ribs" make it easier to arrange teeth on them without reducing the strength of the "ribs".

[0040] Specifically, the cylindrical design of advanced drill bits is necessary to ensure strength, while the self-helical toothed "ribs" and chip removal grooves are designed to optimize tooth distribution, sand removal, and sand lifting.

[0041] In one embodiment, from the perspective of the design of the tooth selection and tooth arrangement method for the advanced drill bit's strong self-sharpening, the tooth arrangement method satisfies the following: when the teeth arranged on the advanced drill bit wear down to a certain extent, new teeth are broken off to achieve the tooth self-sharpening effect; the teeth arranged on the advanced drill bit generate tooth breakage under the impact of drilling, thereby generating new self-sharpening teeth; the tooth arrangement method is self-sharpening, and by arranging teeth in a "hidden tooth" manner, the stress state of the initial teeth is changed, so that after the teeth with high initial stress wear down or break off, the teeth with low initial stress begin to break rocks under high load.

[0042] In one embodiment, the advanced drill bit adopts an eccentric design, where the central axes of the advanced drill bit and the follower drill bit are not on the same straight line.

[0043] Specifically, the micro-eccentric design of the advanced drill bit means that the central axes of the advanced and follower drill bits are not on a straight line. The revolution of the advanced drill bit generates rock-breaking effect along its central axis of revolution. Simultaneously, the hole formed by the advanced drill bit alters the structural stress of the rock it contacts, causing the surrounding rock to tend to collapse inwards, thus reducing the local rock strength. This allows the vertical pressure of the follower drill bit to exert a radial effect on the hole, further facilitating rock breaking by the follower drill bit and reducing the energy required for rock breaking. Furthermore, the micro-eccentric shape creates a micro-reaming effect, which is more conducive to sand removal and lifting. Under the jet action of the elongated water inlet at the top, it promotes the cleaning, lubrication, and cooling of the advanced drill bit, and also prevents sand jamming and repeated breakage. The micro-eccentric design enhances the rock-breaking and micro-reaming effects of the advanced drill bit, avoids energy waste from repeated rock breaking, and reduces the energy required for rock breaking by the follower drill bit.

[0044] In one embodiment, the retrace bit has an extended water inlet, which, based on jet action, promotes cleaning, lubrication, and cooling of the advanced drill bit, preventing sand jamming and repeated breakage. Through the design of tooth selection and placement in the retrace bit, the advanced drill bit achieves a self-sharpening effect, while significantly increasing its rock-breaking efficiency.

[0045] Compared with the prior art, the present invention has the following advantages in terms of self-stabilization and reducing rock breaking energy: (1) The strength of the drill bit body is optimized, improving the impact resistance and life of the drill bit; (2) The function of the chip removal groove is further optimized; (3) The strength of the "rib" of the teeth is improved, and the self-sharpening of the teeth and the self-sharpening of the tooth arrangement method are combined; (4) The function of expanding the hole with micro-eccentricity and avoiding repeated rock breaking; (5) The drill bit itself has a self-stabilizing design for straightening and vibration reduction.

[0046] In summary, the drill bit of this invention is adaptable to rock breaking of different rock types, especially showing significant advantages in hard formations. This invention includes the overall design of the drill bit, the dimensions of the advanced drill bit section, the cylindrical, self-helical shape of the advanced drill bit, the self-sharpening tooth selection and arrangement method, and the micro-eccentric design of the advanced drill bit. The overall design of the drill bit maximizes rock breaking efficiency, while the layout design of the advanced and follow-up drill bits further promotes the stability of the drill bit's working state, maximizing drill bit protection and extending its service life. The structural shape of the advanced drill bit, the tooth selection, and the tooth arrangement ensure its strength, especially the strength required after tooth placement; the "pointed" and "cross" bottom design facilitates easier penetration into the formation; the double-helical design facilitates sand removal and lifting, and also aids in drill bit cleaning, cooling, and lubrication; the tooth selection and arrangement method enable the drill bit to achieve self-sharpening capability, further meeting the requirements of mechanical drilling speed and drilling footage.

[0047] The drill bit of this invention provides a stepped rock-breaking sequence. By breaking the central part of the rock to be broken first, the initial stress direction of the local rock is changed, thereby reducing the strength of the local rock and optimizing and reducing the rock-breaking efficiency, thus reducing the energy required for overall rock breaking. At the same time, the integrated design and the split-size heterogeneous structure of this invention also have strong self-aligning, vibration reduction and stabilizing effects, which can meet the requirements of both aggressiveness and wear resistance when the drill bit breaks rock.

[0048] Figure 2 A flowchart of a drill bit optimization design method for steadily reducing rock-breaking energy according to an embodiment of the present invention is shown.

[0049] like Figure 2 In step S201, the overall structure of the drill bit is determined, and the dimensions of the advanced drill bit and the subsequent drill bit are specified.

[0050] like Figure 2 In step S202, with the goal of enhancing self-sharpening and improving rock-breaking ability, the structural shape, tooth selection, and tooth arrangement of the advanced drill bit are optimized.

[0051] like Figure 2 In step S203, based on the principle of stepped rock breaking, the transition section between the advanced drill bit and the subsequent drill bit is optimized to obtain... Figure 1 This illustrates a drill bit that self-stabilizes to reduce rock-breaking energy.

[0052] The present invention provides a self-stabilizing drill bit that reduces rock-breaking energy and a drill bit optimization design method, which can also be used in conjunction with a computer-readable storage medium. The storage medium stores a computer program, and executing the computer program runs a drill bit optimization design that stabilizes and reduces rock-breaking energy. The computer program can execute computer instructions, which include computer program code. The computer program code can be in the form of source code, object code, executable file, or some intermediate form, etc.

[0053] Computer-readable storage media can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc.

[0054] It should be noted that the contents of computer-readable storage media may be appropriately added to or subtracted from the contents according to the requirements of legislation and patent practice in a jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable storage media may not include electrical carrier signals and telecommunication signals.

[0055] In summary, the self-stabilizing drill bit and drill bit optimization design method provided by this invention have the following beneficial effects: By adopting a stepped drill bit design layout, optimizing the drill bit's feeding method, and employing self-sharpening tooth selection and placement, the rock-breaking sequence is altered, and the utilization of rock-breaking energy is optimized, thus minimizing the energy required for rock breaking. Simultaneously, the split-size design also provides strong self-alignment and vibration reduction stabilization, and maximizes the area requiring rock breaking. Furthermore, the drill bit's self-sharpening effect effectively ensures the achievement of mechanical drilling speed and drilling footage targets.

[0056] It should be understood that the embodiments disclosed herein are not limited to the specific structures, processing steps, or materials disclosed herein, but should be extended to equivalent substitutions of these features as understood by those skilled in the art. It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

[0057] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0058] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0059] The phrase "an embodiment" or "an embodiment" used in this specification means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Therefore, the phrase "an embodiment" or "an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0060] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

[0061] While the embodiments disclosed in this invention are as described above, the content is merely for the purpose of facilitating understanding of the invention and is not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and variations in form and detail of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection for this invention shall still be determined by the scope defined in the appended claims.

Claims

1. A self-stabilizing drill bit that reduces rock-breaking energy, characterized in that, The drill bit adopts an integrated, one-piece structure, comprising: Advanced drill bits, which have a cylindrical self-helical structure, distribute teeth in a strong self-sharpening manner; The transition section between the rear drill bit and the advanced drill bit adopts a gradual design to achieve a stepped rock-breaking effect. The lower third of the drill bit is the advanced drill bit, and the upper two-thirds of the drill bit is the rear drill bit. The diameter of the advanced drill bit is half the diameter of the rear drill bit, and the height of the advanced drill bit is half the height of the rear drill bit. The advanced drill bit adopts a micro-eccentric design, and the central axes of the advanced drill bit and the rear drill bit are not on the same straight line. The advanced drill bit has a double-helix toothed "ribbed" and a double-helix chip removal groove. The helix starts from the bottom and spirals upwards to the right. The end of the helix is ​​at the transition part between the advanced drill bit and the rear drill bit. The start and end of the helix are in a 180-degree direction. The tooth arrangement method of strong self-sharpening satisfies the following: when the teeth on the advanced drill bit wear down to a certain extent, new teeth will break off to achieve the effect of tooth self-sharpening. Moreover, the tooth arrangement method is self-sharpening. By arranging the teeth in a "hidden tooth" manner, the stress state of the initial teeth is changed. After the teeth with high initial stress wear down or break off, the teeth with low initial stress begin to bear a large load and break rocks.

2. The drill bit with self-stabilizing rock-breaking energy reduction as described in claim 1, characterized in that, The advanced drill bit is cylindrical and has teeth on it.

3. The drill bit with self-stabilizing rock-breaking energy reduction as described in claim 1, characterized in that, The tooth arrangement method of strong self-sharpening satisfies the following condition: the teeth arranged on the advanced drill bit will break under the impact of drilling, and then generate new self-sharpening teeth.

4. The drill bit with self-stabilizing rock-breaking energy reduction as described in claim 1, characterized in that, The rear drill bit has an extended water inlet, which, based on jet action, promotes cleaning, lubrication, and cooling of the advanced drill bit, preventing sand jamming and repeated breakage of the advanced drill bit.

5. A drill bit optimization design method for self-stabilizing and reducing rock-breaking energy, characterized in that, The method includes the following steps: Determine the overall structure of the drill bit and specify the dimensions of the advanced drill bit and the rear drill bit; With the goal of enhancing self-sharpening ability and improving rock-breaking capability, the structural shape, tooth selection and tooth arrangement of the advanced drill bit are optimized. Based on the principle of stepped rock breaking, the transition section between the advanced drill bit and the subsequent drill bit is optimized to obtain a self-stabilizing drill bit that reduces rock breaking energy as described in any one of claims 1-4.

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