Wear-resistant and impact-resistant drill bit

Abstract

The utility model relates to the technical field of well drilling, and provides a wear-resistant and impact-resistant drill bit which is beneficial to upward discharge of rock blocks and comprises a connector, and a first cutting part and a second cutting part are arranged at the lower end of the connector; the first cutting part comprises a mounting seat and a first cutting group, the mounting seat is detachably arranged on the bottom surface of the joint, and the first cutting group is fixedly arranged on the bottom surface of the mounting seat; the first cutting group comprises a first drilling tool and a first fixing seat, the first fixing seat is fixedly arranged on the bottom surface of the mounting seat, and the drilling tool is fixedly arranged on the first fixing seat; the second cutting set is fixedly arranged on the side face of the connector. The second cutting set comprises at least two second drilling tools and a second fixing base, the fixing end of the second fixing base is fixedly arranged on the side face of the connector, and the second drilling tools are fixedly arranged on the second fixing base. And the cutting starting point of the first drilling tool is lower than that of the second drilling tool.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling, and particularly relates to an abrasion-resistant and impact-resistant drill bit. Background Art

[0002] During the drilling process, if the rock fragments broken by the drill bit cannot be discharged upward through the drill bit in time, they will be repeatedly broken by the drill bit. This not only affects the drilling efficiency and accelerates the wear of the drill bit, but also the fine-grained rock debris formed after repeated cutting will be mixed into the mud and affect the subsequent solid-phase treatment of the mud.

[0003] Therefore, to solve the above problems, this case proposes a drill bit that is conducive to the upward discharge of rock fragments. Summary of the Utility Model

[0004] Therefore, in view of the above problems, the utility model proposes an abrasion-resistant and impact-resistant drill bit that is conducive to the upward discharge of rock fragments.

[0005] To solve the above technical problems, the solution adopted by the utility model is: an abrasion-resistant and impact-resistant drill bit, including a joint connected to an external rotating rod, and a first cutting part and a second cutting part are arranged at the lower end of the joint;

[0006] The first cutting part includes a mounting seat and at least one group of first cutting groups. The mounting seat is detachably arranged on the bottom surface of the joint, and the first cutting groups are fixedly arranged on the bottom surface of the mounting seat; each first cutting group includes a first drill bit and a first fixing seat. The first fixing seat is fixedly arranged on the bottom surface of the mounting seat, and the drill bit is fixedly arranged on the first fixing seat;

[0007] The second cutting part includes at least two groups of second cutting groups arranged at intervals. The second cutting groups are fixedly arranged on the side surface of the joint; each second cutting group includes at least two second drill bits and a second fixing seat. The fixed end of the second fixing seat is fixedly arranged on the side surface of the joint, and the second drill bits are fixedly arranged on the second fixing seat;

[0008] The cutting starting point of the first drill bit is lower than that of the second drill bit.

[0009] A further improvement is that the rear end of the second drill bit is fixedly arranged on the second fixing seat, the front end of the second drill bit bends inward and inclines downward with the central axis of the joint as the center, and the front end surface, outer side surface and bottom surface of the second drill bit form a cutting surface, and the front end surface and the bottom surface gradually bulge from both sides to the middle.

[0010] A further improvement is that the second drill bit is provided with a slot at the lower end of the front end surface, the outer side surface and the front end of the bottom surface, and a diamond cutting head with a shape consistent with the missing shape of the slot is embedded in the slot.

[0011] A further improvement is that a number of diamond particles for reducing the wear rate of the second drill bit are fixedly welded on the front end surface, the outer side surface and the bottom surface.

[0012] A further improvement is that: the longitudinal cross-section of the second fixing seat is in the shape of an inverted triangle, the intersection line of the two lower side surfaces of the second fixing seat is obliquely upward along the fixed end of the second fixing seat toward the free end, the rear end of the second drill bit is provided with an inverted triangular groove welded and fixed to the two lower side surfaces of the second fixing seat from the upper end surface downward, the cutting starting point of the second drill bit located on the free end side of the second fixing seat is higher than the cutting starting point of the second drill bit located on the fixed end side, and the upper end surface of the second fixing seat is an inclined surface inclined obliquely upward from the side close to the cutting end of the second drill bit to the other side.

[0013] A further improvement is that: the connector is provided with a mounting groove from the bottom surface upward, the upper end surface of the mounting seat is provided with a mounting plug that fits with the side wall of the mounting groove, the connector is located on both sides of the mounting plug and has mounting holes penetrating in a direction perpendicular to the mounting plug, the mounting plug is provided with corresponding connecting holes, and a locking piece for locking the mounting seat to the connector is passed through the mounting hole.

[0014] Further improvements are: the first fixing seat is welded to the bottom surface of the mounting seat, the first drill bit layer is cylindrical, a fixing channel is obliquely opened on the first fixing seat, the upper end of the first drill bit is passed through and welded to the fixing channel, and the outer diameter of the lower end of the first drill bit gradually decreases downward.

[0015] A further improvement is that: a diamond is embedded on the lower tip of the first drill bit, and the exposed portion of the diamond is in a cone shape with the tip facing downward.

[0016] By adopting the above technical solution, the beneficial effects of the utility model are:

[0017] In this case, a first cutting portion is provided on the bottom surface of the joint, and a second cutting portion is provided on the side surface of the joint. The cutting starting point of the first drill bit in the first cutting portion is lower than the cutting starting point of the second drill bit, and the cutting starting point of the first drill bit is located inside, and the cutting starting point of the second drill bit is located outside. During the cutting process, the cutting plane formed by the connection between the first drill bit and the second drill bit intersects with the horizontal plane, which facilitates the inward and upward movement of mud and rock blocks cut by the drill bit. The spacing between the second cutting portions located on the side surface of the connection provides space for the mud and rock blocks to be discharged inward and upward, which is beneficial to the discharge of mud and rock blocks, alleviates the situation where rock blocks are retained and repeatedly cut, facilitates the subsequent solid phase treatment of mud removal, and improves drilling efficiency and extends the service life of the drill bit.

[0018] A further beneficial effect is that the second drill bit is bent inward with the central axis of the joint as the center and is inclined downwardly disposed on the second fixing seat, and the front end face and the bottom face are gradually convex from both sides to the middle, which is beneficial to reducing the cutting resistance and improving the drilling efficiency.

[0019] A further beneficial effect is that a slot is provided at the intersection of the lower end of the front end face, the outer side face and the front end of the bottom face of the second drill bit, and a diamond cutting head having the same shape as the missing part of the slot is embedded in the slot, which is beneficial to improving the wear resistance and impact resistance of the second drill bit.

[0020] A further beneficial effect is that diamond grains are fixedly welded on the front end face, the outer side face and the bottom face of the second drill bit, which is beneficial to reducing the wear rate of the second drill bit and improving the wear resistance of the second drill bit.

[0021] A further beneficial effect is that the longitudinal cross-section of the second fixing seat is in an inverted triangular shape, which is beneficial to reducing the pressing area on the rock block and facilitating the upward movement of the rock block; the intersection line of the two lower side faces of the second fixing seat is inclined upward, the cutting planes of the two second drill bits are inclined planes, and the second fixing seat is also an inclined plane, all of which are beneficial to reducing the cutting resistance and facilitating the inward and upward discharge of the cut mud and rock blocks.

[0022] A further beneficial effect is that the first drill bit is inclined and a conical diamond is embedded at the lower end, which is beneficial to improving the wear resistance and impact resistance of the first drill bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a front view structural schematic diagram of a wear-resistant and impact-resistant drill bit according to an embodiment of the present invention.

[0024] Figure 2 is a side view structural schematic diagram of a wear-resistant and impact-resistant drill bit according to an embodiment of the present invention.

[0025] Figure 3 is an internal structural schematic diagram of a wear-resistant and impact-resistant drill bit according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] Refer to Figures 1 to 3 , what is disclosed in the embodiment of the present invention is a wear-resistant and impact-resistant drill bit, which includes a joint 10 connected to an external rotating rod, and a first cutting part and a second cutting part are provided at the lower end of the joint 10; the joint 10 is made of cemented carbide.

[0028] The first cutting part includes a mounting base 11 and two groups of first cutting groups. The mounting base 11 is detachably arranged on the bottom surface of the joint 10, and the first cutting groups are fixedly arranged on the bottom surface of the mounting base 11. Each first cutting group includes a first drill bit 12 and a first fixing base 13. The first fixing base 13 is fixedly arranged on the bottom surface of the mounting base 11, and the drill bit is fixedly arranged on the first fixing base 13. The mounting base 11, the first drill bit 12, and the first fixing base 13 are made of cemented carbide.

[0029] The second cutting part includes at least two groups of second cutting groups arranged at intervals. The second cutting groups are fixedly arranged on the side surface of the joint 10. Each second cutting group includes two second drill bits 14 and a second fixing base 15. The fixed end of the second fixing base 15 is integrally arranged or fixedly welded on the side surface of the joint 10, and the second drill bits 14 are fixedly arranged on the second fixing base 15. The second fixing base 15 and the second drill bits 14 are made of cemented carbide.

[0030] The cutting starting point of the first drill bit 12 is lower than that of the second drill bit 14.

[0031] The rear end of the second drill bit 14 is fixedly arranged on the second fixing base 15. The front end of the second drill bit 14 bends inward and slopes downward with the central axis of the joint 10 as the center. The front end face, outer side face, and bottom face of the second drill bit 14 form a cutting surface. The front end face and the bottom face gradually bulge from both sides to the middle to reduce the cutting resistance.

[0032] The second drill bit 14 is provided with slots at the lower end of the front end face, the front ends of the outer side face and the bottom face. Diamond cutting heads 16 with shapes consistent with the missing parts of the slots are embedded in the slots. A number of diamond grains 17 for reducing the wear speed of the second drill bit 14 are fixedly welded on the front end face, outer side face, and bottom face.

[0033] The longitudinal cross-section of the second fixing base 15 is in an inverted triangular shape, which is beneficial to reducing the compression area of the rock block and facilitating the upward movement of the rock block. The intersection line of the two lower side faces of the second fixing base 15 slopes upward from the fixed end to the free end of the second fixing base 15. The rear end of the second drill bit 14 is provided with inverted triangular grooves that fit and are fixedly welded to the two lower side faces of the second fixing base 15 from the upper end face downward. The cutting starting point of the second drill bit 14 on the free end side of the second fixing base 15 is higher than that of the second drill bit 14 on the fixed end side, which is beneficial to reducing the impact force of the rock formation on the drill bit. The upper end face of the second fixing base 15 is an inclined surface that slopes upward from the side close to the cutting end of the second drill bit to the other side, which is beneficial to providing an upward movement thrust for the rock block and facilitating the broken rock block to move upward and escape from the cutting of the drill bit.

[0034] The joint 10 is provided with an installation groove 18 opened upward from the bottom surface. The upper end surface of the mounting base 11 is provided with a mounting insert block 19 that fits against the side wall of the installation groove 18. The joint 10 is provided with mounting holes 20 penetrating vertically along the direction of the mounting insert block 19 on both sides of the mounting insert block 19. A connection hole 21 is correspondingly provided on the mounting insert block 19. A locking member (not shown in the figure) for locking the mounting base 11 to the joint 10 is inserted into the mounting hole 20. The locking member is a bolt and nut assembly. The bolt and nut are made of hard alloy steel. The head and tail of the bolt do not protrude from the side surface of the connector 10.

[0035] The first fixing base 13 is welded to the bottom surface of the mounting base 11. The first drill bit 12 is cylindrical. The first fixing base 13 is obliquely provided with a fixing channel 22. The upper end of the first drill bit 12 is inserted and welded in the fixing channel. The outer diameter of the lower end of the first drill bit 12 gradually decreases downward. A diamond 23 is embedded in the lower tip of the first drill bit 12. The exposed part of the diamond is in the shape of a cone with the tip facing downward. The first drill bits 12 of the two first cutting groups face different directions.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements. These changes and improvements fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wear-resistant and impact-resistant drill bit, comprising a joint connected to an external rotating rod, characterized in that: The lower end of the joint is provided with a first cutting portion and a second cutting portion; The first cutting portion includes a mounting seat and at least one first cutting group, the mounting seat being detachably mounted on the bottom surface of the joint, and the first cutting group being fixedly mounted on the bottom surface of the mounting seat; the first cutting group includes a first drill and a first fixing seat, the first fixing seat being fixedly mounted on the bottom surface of the mounting seat, and the drill being fixedly mounted on the first fixing seat; The second cutting portion includes at least two second cutting groups spaced apart from each other, the second cutting groups being fixedly mounted on the side surface of the joint; the second cutting group includes at least two second drill bits and a second fixing seat, the fixing end of the second fixing seat being fixedly mounted on the side surface of the joint, and the second drill bits being fixedly mounted on the second fixing seat; A cutting starting point of the first drill bit is lower than a cutting starting point of the second drill bit.

2. The wear-resistant and impact-resistant drill bit according to claim 1, characterized in that: The rear end of the second drill bit is fixedly arranged on the second fixed seat, and the front end of the second drill bit is bent inward and inclined downward with the central axis of the joint as the center. The front end face, outer side face and bottom face of the second drill bit form a cutting surface, and the front end face and bottom face gradually bulge from both sides to the middle.

3. The wear-resistant and impact-resistant drill bit according to claim 2, wherein: The second drill bit is provided with a slot at the lower end of the front end face and the front end of the outer side face and the bottom face, and a diamond cutting head having the same shape as the missing portion of the slot is embedded in the slot.

4. A wear-resistant and impact-resistant drill bit according to claim 2, characterized in that: A plurality of diamond particles for reducing the wear speed of the second drill bit are fixedly welded on the front end surface, the outer side surface and the bottom surface.

5. The wear-resistant and impact-resistant drill bit according to claim 2, characterized in that: The longitudinal cross-section of the second fixing seat is in the shape of an inverted triangle, and the intersection line of the two lower side surfaces of the second fixing seat is inclined upward along the fixed end toward the free end of the second fixing seat. The rear end of the second drill bit is provided with an inverted triangle groove welded and fixed to the two lower side surfaces of the second fixing seat from the upper end surface downward. The cutting starting point of the second drill bit located on the free end side of the second fixing seat is higher than the cutting starting point of the second drill bit located on the fixed end side. The upper end surface of the second fixing seat is an inclined surface inclined upward from the side close to the cutting end of the second drill bit to the other side.

6. The wear-resistant and impact-resistant drill bit according to claim 1, characterized in that: The connector is provided with a mounting groove extending upward from the bottom surface, and a mounting plug is provided on the upper end surface of the mounting seat that fits in with the side wall of the mounting groove. The connector is located on both sides of the mounting plug and has mounting holes extending through the mounting plug in a direction perpendicular to the mounting plug. The mounting plug is provided with corresponding connecting holes, and a locking piece for locking the mounting seat to the connector is passed through the mounting hole.

7. A wear-resistant and impact-resistant drill bit according to claim 1 or 6, characterized in that: The first fixing seat is welded to the bottom surface of the mounting seat, the first drill bit layer is cylindrical, a fixing channel is obliquely opened on the first fixing seat, the upper end of the first drill bit is passed through and welded to the fixing channel, and the outer diameter of the lower end of the first drill bit gradually decreases downward.

8. A wear-resistant and impact-resistant drill bit according to claim 7, characterized in that: A diamond is embedded on the lower tip of the first drill bit, and the exposed portion of the diamond is in a cone shape with the tip facing downward.

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