Composite drill bit with rotary cutting rock breaking function

Abstract

The invention discloses a composite drill bit with a rotary cutting rock breaking function, and relates to the technical field of drill bits, the composite drill bit comprises a drill bit body, an external thread connector is fixedly mounted on the lower surface of the drill bit body, the upper end of the drill bit body is of an arc-shaped structure, and two wheel palms and a fixed cutting blade are welded to the upper portion of the outer surface of the drill bit body; six nozzles are formed in the upper surface of the drill bit body, and second fixed cutting teeth are welded to the left side of the front side of the wheel palm and the right side of the front side of the fixed cutting blade. Through combination of the cone cutting teeth, the second fixed cutting teeth and the first fixed cutting teeth, two sets of cutting tracks can be formed on rock at the bottom of a well, so that a net-shaped crushing area is formed at the bottom of the well, rock crushing of the cutting teeth is facilitated, and the rock crushing efficiency of the drill bit is remarkably improved; the cutting teeth on the rotating wheel are evenly abraded, all the cutting teeth are fully utilized, and early failure of the drill bit caused by failure of a small number of cutting teeth is reduced or avoided.

Description

Technical Field

[0001] The invention relates to the technical field of drill bits, and in particular to a composite drill bit with a rotary cutting and rock breaking function. Background Art

[0002] The drill bit is a commonly used drilling tool. It is a rock-breaking tool used to break rocks and form wellbores in drilling projects. It is usually made of metal. The materials and shapes of drill bits for different purposes are also different. The drill bits used in drilling projects today mainly include roller bits and PDC bits. When exploring and breaking rocks, a composite drill bit with rotary cutting and rock breaking function is needed.

[0003] The existing technology has the following problems:

[0004] PDC cutting teeth cut rocks continuously. The heat generated by the intense friction will cause the teeth to reach a very high temperature. When the temperature exceeds a certain limit, the wear rate of the PDC cutting teeth increases significantly, leading to thermal wear. The failure of individual teeth on the drill bit will significantly increase the workload of the PDC cutting teeth and accelerate their wear rate, which will lead to premature failure of the drill bit and greatly reduce the service life of the drill bit. At the same time, traditional drill bits are difficult to process and have complex tooling processes. Excessively high welding temperatures will reduce the hardness of the drill bit, making it difficult to ensure quality. Summary of the invention

[0005] The present invention provides a composite drill bit with a rotary cutting and rock breaking function to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A composite drill bit with a rotary rock-breaking function comprises a drill body, an externally threaded joint is fixedly installed on the lower surface of the drill body, the upper end of the drill body is in an arc-shaped structure, two wheel palms and fixed cutting blades are welded to the upper part of the outer surface of the drill body, six nozzles are provided on the upper surface of the drill body, two fixed cutting teeth are welded on the left side of the front side of the wheel palm and the right side of the front side of the fixed cutting blade, a mounting groove is provided on the upper part of the front side of the wheel palm, a shaft neck is fixedly installed on the front side of the mounting groove, the front end of the shaft neck is rotatably connected to a runner, and a plurality of tooth wheel cutting teeth are welded on the circumferential outer surface of the runner.

[0008] Preferably, the six nozzles are distributed in a circular array in the circumferential direction about the axis of the drill bit body, and the nozzles are located between adjacent wheel palms and fixed cutting blades.

[0009] Preferably, the two wheel palms are located on the left and right sides of the drill bit body, the two fixed cutting blades are located on the front and rear sides of the drill bit body, and are symmetrically arranged about the axis of the drill bit body, and the fixed cutting blades and the wheel palm are provided with arc surfaces on one side close to the drill bit body.

[0010] Preferably, the rear edges of the left and right sides of the fixed cutting blade are both provided with rounded corners 1, and the two left corners on the front side of the wheel palm and the front lower corner on the left side of the fixed cutting blade are both provided with rounded corners 2.

[0011] Preferably, a plurality of wear-resistant and gauge-guarding teeth distributed in a rectangular array are fixedly mounted on the wheel palm and the side of the fixed cutting blade away from the drill bit body, and the ends of the wear-resistant and gauge-guarding teeth are in an arc-shaped structure.

[0012] Preferably, undercut eye teeth are welded at the corners of the lower left side of the front side of the wheel palm and the lower right side of the front side of the fixed cutting blade.

[0013] Preferably, a plurality of fixed cutting teeth 1 are welded to the outer surface of the fixed cutting blade wing, and the right end of the fixed cutting tooth 1 extends to the right side of the fixed cutting blade wing.

[0014] Preferably, the cone cutting teeth, the first fixed cutting teeth and the second fixed cutting teeth are cutting teeth containing diamond or cubic boron carbide, and are made of polycrystalline diamond composite sheets.

[0015] Preferably, a plurality of the wheel cutting teeth are distributed in a circular array in the circumferential direction about the axis of the runner, and the wheel cutting teeth extend the front end of the runner, and a protrusion is provided on the upper part of the front side of the wheel palm.

[0016] Due to the adoption of the above technical solution, the present invention has the following technical advances compared with the prior art:

[0017] 1. The present invention provides a composite drill bit with a rotary cutting and rock breaking function. By arranging a plurality of fixed cutting teeth 2 and fixed cutting teeth 1 to share the drilling pressure together, the pressure on each tooth is reduced, the wear resistance of the drill bit is improved, the drilling pressure required for drilling is small, the load on the drill bit bearing is small, and the load fluctuation amplitude is low. The bearing rotates slowly and generates less heat, thereby extending the service life of the entire drill bit. Diamond composite elements such as PDC composite sheets are used as cutting teeth, so that the drill bit has the characteristics of high hardness and high strength, can withstand high-intensity impact, and can crush rocks by impact. The drill bit is worn during rotation, and the number of composite sheets is large, and the corresponding wear resistance times are large, thereby increasing the service life.

[0018] 2. The present invention provides a composite drill bit with rotary cutting and rock breaking function. Through the combination of the cone cutting teeth, the second fixed cutting teeth and the first fixed cutting teeth, two sets of cutting tracks can be formed on the bottom hole rock, thereby forming a mesh crushing area at the bottom hole, which is beneficial to the cutting teeth to crush the rock and significantly improve the rock breaking efficiency of the drill bit. The cone cutting teeth on the rotating wheel work alternately, so that the cutting teeth on the rotating wheel wear evenly, and each cutting tooth is fully utilized, thereby reducing or avoiding the early failure of the drill bit caused by the failure of a few cutting teeth. At the same time, the cooling effect is good, and thermal wear is not easy to occur, thereby extending the service life of the drill bit.

[0019] 3. The present invention provides a composite drill bit with a rotary cutting and rock breaking function. The processing of the cutting teeth is simplified by setting the second rounded corner, the first rounded corner and the arc surface. It is easy to assemble and process. It only needs to weld two wheel palms and fixed cutting blades to the drill bit body, and a rotating wheel and a cone cutting tooth are set on the wheel palm to make the cone cutting tooth rotate, thereby reducing the use of knives. The fewer the knives, the faster the speed, and the corresponding service life of the drill bit is also long. It is avoided to set up multiple tools, simplifying processing and tooling, and ensuring the product quality of the drill bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention from a first viewing angle;

[0021] Figure 2 It is a schematic diagram of the structure of the second viewing angle of the present invention;

[0022] Figure 3 It is a schematic diagram of the structure from a third viewing angle of the present invention;

[0023] Figure 4 It is a schematic diagram of the cross-sectional structure of the wheel palm of the present invention;

[0024] Figure 5 It is a schematic diagram of the wheel palm structure of the present invention;

[0025] Figure 6 It is a schematic diagram of the fixed cutting blade structure of the present invention.

[0026] In the figure: 1, drill body; 2, external thread joint; 3, wheel palm; 4, fixed cutting blade; 5, nozzle; 6, runner; 7, wear-resistant gauge teeth; 8, inverted eye teeth; 9, cone cutting teeth; 10, fixed cutting teeth 1; 11, fixed cutting teeth 2; 12, chamfered corner 1; 13, mounting groove; 14, protrusion; 15, chamfered corner 2; 16, arc surface; 17, journal. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0028] like Figure 1-Figure 6 As shown, a composite drill bit with a rotary cutting and rock breaking function comprises a drill body 1, an external threaded joint 2 is fixedly installed on the lower surface of the drill body 1, the upper end of the drill body 1 is in an arc-shaped structure, two wheel palms 3 and fixed cutting blades 4 are welded to the upper part of the outer surface of the drill body 1, six nozzles 5 are provided on the upper surface of the drill body 1, fixed cutting teeth 11 are welded to the left side of the front side of the wheel palm 3 and the right side of the front side of the fixed cutting blade 4, a mounting groove 13 is provided on the upper part of the front side of the wheel palm 3, a shaft neck 17 is fixedly installed on the front side of the mounting groove 13, a runner 6 is rotatably connected to the front end of the shaft neck 17, and a plurality of tooth wheel cutting teeth 9 are welded to the circumferential outer surface of the runner 6.

[0029] It is only necessary to weld two wheel palms 3 and fixed cutting blades 4 to the drill bit body 1, and a rotating wheel 6 and a cone cutting tooth 9 are arranged on the wheel palm 3. The cone cutting tooth 9 is rotated through the shaft neck 17 to reduce the use of the cutter. The cone cutting teeth 9 work alternately, so that the cutting teeth on the rotating wheel 6 are evenly worn, and each cutting tooth is fully utilized, thereby reducing or avoiding the early failure of the drill bit due to the failure of a few cutting teeth. At the same time, the cooling effect is good, and thermal wear is not easy to occur, thereby extending the service life of the drill bit. When in use, the drill bit body 1 is installed on the power drive equipment through the external threaded connector 2, and high-speed drilling fluid is sprayed through the nozzle 5 to destroy the rock, so as to achieve the purpose of increasing the mechanical penetration rate of the drill bit. Through the combination of the cone cutting teeth 9 and the fixed cutting teeth 11, two sets of cutting tracks can be formed on the bottom hole rock, and a mesh crushing area is formed at the bottom of the well, which is conducive to the cutting teeth to crush the rock.

[0030] like Figure 1-Figure 3 As shown, six nozzles 5 are distributed in a circular array in the circumferential direction about the axis of the drill body 1 , and the nozzles 5 are located between adjacent wheel palms 3 and fixed cutting blades 4 .

[0031] The high-speed drilling fluid is ejected through the nozzle 5 to break the rock, thereby improving the rock breaking efficiency of the drill bit and achieving the purpose of increasing the mechanical drilling speed of the drill bit.

[0032] like Figure 1-Figure 5 As shown, two wheel palms 3 are located on the left and right sides of the drill body 1, and two fixed cutting wings 4 are located on the front and rear sides of the drill body 1, and are symmetrically arranged about the axis of the drill body 1. The fixed cutting wings 4 and the wheel palm 3 are provided with an arc surface 16 on one side close to the drill body 1, and the rear edges of the left and right sides of the fixed cutting wings 4 are provided with chamfered corners 12, and the two left corners on the front side of the wheel palm 3 and the front lower corners on the left side of the fixed cutting wing 4 are provided with chamfered corners 15.

[0033] The second rounded corner 15, the first rounded corner 12 and the arc surface 16 are provided to simplify the processing of the cutting teeth, and are easy to assemble and process. It is only necessary to weld the two wheel palms 3 and the fixed cutting blade wing 4 to the drill body 1, thereby reducing the use of knives. The fewer knives, the faster the speed, and the corresponding service life of the drill bit is also long. It is avoided to set up multiple tools, simplifying processing and tooling, and ensuring the product quality of the drill bit. The arc surface 16 is provided to make the wheel palm 3 and the fixed cutting blade wing 4 fit with the drill body 1, which is easy to install.

[0034] like Figure 1-Figure 6 As shown, a plurality of wear-resistant gauge teeth 7 distributed in a rectangular array are fixedly mounted on the wheel palm 3 and the side of the fixed cutting blade 4 away from the drill body 1, and the ends of the wear-resistant gauge teeth 7 are in an arc-shaped structure.

[0035] During the drilling process, the wear-resistant gauge teeth 7 achieve the purpose of gauge protection, can protect the wear of the drill tool to the greatest extent, and reduce the cost of drilling.

[0036] like Figure 1-Figure 6 As shown, undercut eye teeth 8 are welded at the corners of the lower left side of the front side of the wheel palm 3 and the lower right side of the front side of the fixed cutting blade 4.

[0037] Repair the well wall and remove debris attached to the well wall to make the wellbore regular and unobstructed.

[0038] like Figure 1-Figure 6 As shown, a plurality of fixed cutting teeth 10 are welded to the outer surface of the fixed cutting blade 4, and the right end of the fixed cutting tooth 10 extends to the right side of the fixed cutting blade 4, the tooth wheel cutting tooth 9, the fixed cutting tooth 10, and the fixed cutting tooth 11 are cutting teeth containing diamond or cubic boron carbide, and the material is polycrystalline diamond composite sheet, and the plurality of tooth wheel cutting teeth 9 are distributed in a circular array in the circumferential direction about the axis of the runner 6, and the tooth wheel cutting teeth 9 extend the front end of the runner 6, and a protrusion 14 is provided on the upper part of the front side of the wheel palm 3, which is easy to install the runner 6.

[0039] A plurality of fixed cutting teeth 11 and fixed cutting teeth 10 are arranged to share the drilling pressure, thereby reducing the pressure on each tooth and improving the wear resistance of the drill bit. The drilling pressure required for drilling is small, the load on the drill bit bearing is small, and the load fluctuation amplitude is low. The bearing rotates slowly and generates less heat relatively, thereby extending the service life of the entire drill bit. Diamond composite elements such as PDC composite pieces are used as cutting teeth, so that they have the characteristics of high hardness and high strength, can withstand high-intensity impact, and can crush rocks by impact. The drill bit is worn during rotation, and the number of composite pieces is large, and the corresponding wear resistance is also large, thereby increasing the service life. Through the combination of the cone cutting teeth 9, the fixed cutting teeth 11 and the fixed cutting teeth 10, two sets of cutting tracks can be formed on the bottom hole rock, thereby forming a mesh crushing area at the bottom hole, which is beneficial to the cutting teeth to crush rocks and significantly improves the rock breaking efficiency of the drill bit.

[0040] The working principle of the present invention is as follows: the second rounded corner 15, the first rounded corner 12 and the arc surface 16 are provided to simplify the processing of the cutting teeth, and the assembly and processing are easy. It is only necessary to weld two wheel palms 3 and fixed cutting blades 4 to the drill body 1, and a rotating wheel 6 and a cone cutting tooth 9 are provided on the wheel palm 3 to make the cone cutting tooth 9 rotate, thereby reducing the use of the cutter. When in use, the drill body 1 is mounted on the power drive device through the external threaded joint 2, and a high-speed drilling fluid is sprayed out through the nozzle 5 to destroy the rock, so as to achieve the purpose of improving the mechanical drilling speed of the drill bit. Through the combination of the cone cutting tooth 9, the second fixed cutting tooth 11 and the first fixed cutting tooth 10, two sets of cutting tracks can be formed on the bottom rock of the well, and a mesh-shaped crushing can be formed at the bottom of the well. The area is conducive to the cutting teeth to crush rocks. A number of fixed cutting teeth 11 and fixed cutting teeth 10 are set to share the drilling pressure together. Diamond composite elements such as PDC composite pieces are used as cutting teeth, which have the characteristics of high hardness and high strength and can withstand high-intensity impacts. They can crush rocks by impact. There is wear in the process of drill bit rotation. The more composite pieces there are, the more wear resistance times there are, which increases the service life. The cutting teeth 9 on the rotating wheel 6 work alternately, so that the cutting teeth on the rotating wheel 6 wear evenly, and each cutting tooth is fully utilized, which reduces or avoids the early failure of the drill bit caused by the failure of a few cutting teeth. At the same time, the cooling effect is good, thermal wear is not easy to occur, and the service life of the drill bit is extended.

[0041] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A composite drill bit with rotary rock cutting function, comprising a drill bit body (1), characterized in that: An external threaded joint (2) is fixedly mounted on the lower surface of the drill body (1); the upper end of the drill body (1) is in an arc-shaped structure; two wheel palms (3) and fixed cutting blades (4) are welded to the upper portion of the outer surface of the drill body (1); six nozzles (5) are provided on the upper surface of the drill body (1); two fixed cutting teeth (11) are welded to the left side of the front side of the wheel palm (3) and the right side of the front side of the fixed cutting blades (4); a mounting groove (13) is provided on the upper portion of the front side of the wheel palm (3); a shaft neck (17) is fixedly mounted on the front side of the mounting groove (13); a rotating wheel (6) is rotatably connected to the front end of the shaft neck (17); and a plurality of tooth wheel cutting teeth (9) are welded to the circumferential outer surface of the rotating wheel (6).

2. The composite drill bit with rotary rock cutting function according to claim 1, characterized in that: The six nozzles (5) are distributed in a circular array in the circumferential direction about the axis of the drill bit body (1), and the nozzles (5) are located between adjacent wheel palms (3) and fixed cutting blades (4).

3. The composite drill bit with rotary rock cutting function according to claim 1, characterized in that: The two wheel palms (3) are located on the left and right sides of the drill bit body (1), and the two fixed cutting blades (4) are located on the front and rear sides of the drill bit body (1) and are symmetrically arranged about the axis of the drill bit body (1). The fixed cutting blades (4) and the wheel palms (3) are provided with arcuate surfaces (16) on one side close to the drill bit body (1).

4. The composite drill bit with rotary rock cutting function according to claim 1, characterized in that: The rear edges of the left and right sides of the fixed cutting blade (4) are both provided with rounded corners (12), and the two left corners on the front side of the wheel palm (3) and the front lower corner on the left side of the fixed cutting blade (4) are both provided with rounded corners (15).

5. The composite drill bit with rotary rock cutting function according to claim 1, characterized in that: A plurality of wear-resistant gauge teeth (7) distributed in a rectangular array are fixedly mounted on the wheel palm (3) and the side of the fixed cutting blade (4) away from the drill bit body (1), and the ends of the wear-resistant gauge teeth (7) are in an arc-shaped structure.

6. The composite drill bit with rotary cutting and rock breaking function according to claim 1, characterized in that: The corners of the lower left side of the front side of the wheel palm (3) and the lower right side of the front side of the fixed cutting blade (4) are both welded with undercut eye teeth (8).

7. The composite drill bit with rotary cutting and rock breaking function according to claim 1, characterized in that: A plurality of fixed cutting teeth (10) are welded to the outer surface of the fixed cutting blade (4), and the right end of the fixed cutting tooth (10) extends to the right side of the fixed cutting blade (4).

8. The composite drill bit with rotary cutting and rock breaking function according to claim 1, characterized in that: The tooth wheel cutting teeth (9), the fixed cutting teeth one (10) and the fixed cutting teeth two (11) are cutting teeth containing diamond or cubic boron carbide, and the material is a polycrystalline diamond composite sheet.

9. The composite drill bit with rotary cutting and rock breaking function according to claim 1, characterized in that: The plurality of tooth wheel cutting teeth (9) are distributed in a circular array in the circumferential direction about the axis of the rotating wheel (6), and the tooth wheel cutting teeth (9) extend the front end of the rotating wheel (6). A protrusion (14) is provided on the upper part of the front side of the wheel palm (3).

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