An easily replaceable and maintainable assembled combined drill bit and a drilling tool thereof

Abstract

The application discloses an easily-replaced and maintained assembled combination drill bit and a drilling tool, and relates to the technical field of drilling tools.The assembled combination drill bit comprises a drill bit body and an assembled drill layer.The side wall of the end of the drill bit body connected with a joint is provided with a radially protruding tooth surface limiting layer, and the annular end surface of the tooth surface limiting layer away from the joint is inclined to the joint direction.A plug-in slot is formed on the edge of the end surface of the drill bit body away from the joint.The assembled drill layer comprises upper tooth blocks and lower tooth blocks.The upper tooth blocks are detachably connected to the outer side wall of the end of the drill bit body away from the joint, and a plurality of the upper tooth blocks are arranged in a surrounding manner on the outer side of the drill bit body.A plurality of the lower tooth blocks are arranged in a surrounding manner on the outer side of the drill bit body and are located between the upper tooth blocks and the tooth surface limiting layer.The application further provides a drilling tool comprising the above-mentioned easily-replaced and maintained assembled combination drill bit.The drill bit and the drilling tool provided by the application have the advantages of easy maintenance, cost reduction, service life improvement, drilling efficiency improvement and the like.

Description

Technical Field

[0001] This invention relates to the field of drilling tool technology, and more specifically to an easy-to-replace and maintain modular drill bit and drilling tools thereof. Background Technology

[0002] As is well known, a drill bit is a tool that comes into direct contact with rock during the drilling process and breaks the rock through cutting, punching and other actions. The drill bits widely used in modern drilling engineering are mainly roller cone bits and PDC bits.

[0003] In current oil drilling, when encountering hard formations or interlayers, the commonly used PDC (polycrystalline diamond) drill bit primarily achieves drilling through the shearing motion of its PDC teeth. However, due to the load distribution characteristics of the PDC teeth along the drill bit's profile, the nose and shoulder of the bit are prone to premature damage, resulting in a very slow mechanical drilling rate. Roller cone bits, on the other hand, break rocks through impact crushing, easily creating deep fracture pits. However, for drilling in formations with many interlayers of varying hardness, they cannot achieve volumetric rock fragmentation, thus resulting in lower cutting efficiency for the roller cone bit's cutting teeth. Furthermore, when the drill bit encounters formations with numerous interlayers of varying hardness, the fixed cutting teeth of the PDC diamond drill bit are highly susceptible to impact damage.

[0004] As can be seen from the above characteristics of existing drill bits, drill bit breakage is an unavoidable problem. Therefore, how to effectively overcome the reduction in drill bit efficiency caused by drill bit breakage, so as to reduce costs and improve the service life and efficiency of drill bits, is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides an easy-to-replace and maintain modular drill bit and its drilling tools, aiming to solve the above-mentioned technical problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An easy-to-replace and maintain modular drill bit, comprising:

[0008] The drill bit body has a connector at one end. The sidewall of the end of the drill bit body connected to the connector has a radially protruding tooth surface limiting layer. The annular end face of the tooth surface limiting layer away from the connector is inclined towards the connector to form a snap-fit ​​groove. An insertion groove is provided on the edge of the end face of the drill bit body away from the connector.

[0009] The drill bit assembly includes upper and lower toothed blocks. Multiple upper toothed blocks are detachably connected to the outer wall of the drill bit body at the end furthest from the connector. Each upper toothed block has a top portion for insertion into the insertion slot, and a bottom portion forming an inclined surface with an angle similar to the insertion slot. Multiple upper toothed blocks are arranged around the outside of the drill bit body. Multiple lower toothed blocks are also arranged around the outside of the drill bit body, located between the upper toothed blocks and the tooth surface limiting layer. Each lower toothed block is detachably connected to the drill bit body. Each lower toothed block has a top inclined surface that overlaps and presses against the inclined surface of the upper toothed block, and a bottom inclined surface that inserts into the insertion slot.

[0010] Through the above technical solution, the present invention provides an assembled drill bit structure in which an upper toothed block and a lower toothed block are detachably connected on the outside of the drill bit body. Through the cooperation of the wedge-shaped inclined surface, the tooth surface limiting layer restricts the lower toothed block, which in turn restricts the upper toothed block. With the layers stacked, the force exerted by the drill bit gradually decreases from the upper toothed block to the tooth surface limiting layer, making the tooth surface limiting layer less prone to breakage. As the bottom support structure, it has stronger stability, thereby ensuring the stability and structural strength of the overall outer assembled structure. Moreover, when the upper and lower toothed blocks are damaged, they can be easily disassembled and replaced, which greatly reduces costs and ensures the working efficiency of the drill bit.

[0011] Preferably, in the above-mentioned easily replaceable and maintainable modular drill bit, the bottom surface of the insertion slot has a first threaded hole, and the top of the upper toothed block has a first through hole corresponding to the first threaded hole. A first bolt passes through the first through hole and is fastened to the first threaded hole. This threaded connection method ensures both the stability and strength of the connection structure and facilitates disassembly and replacement.

[0012] Preferably, in the aforementioned easily replaceable and maintainable modular drill bit, a first countersunk hole is formed at the end of the first through hole away from the first threaded hole to accommodate the bolt head of the first bolt. By creating the first countersunk hole, the bolt head of the first bolt is prevented from being exposed, thus avoiding interference with drilling.

[0013] Preferably, in the aforementioned easily replaceable and maintainable modular drill bit, a second threaded hole is provided on the outer wall of the drill bit body at a position corresponding to the lower toothed block, and a second through hole is provided on the lower toothed block corresponding to the second threaded hole. A second bolt passes through the second through hole and is fastened to the second threaded hole. This threaded connection method ensures both the stability and strength of the connection structure and facilitates disassembly and replacement.

[0014] Preferably, in the aforementioned easily replaceable and maintainable modular drill bit, a second countersunk hole is formed at the end of the second through hole away from the second threaded hole to accommodate the bolt head of the second bolt. By creating the second countersunk hole, the bolt head of the second bolt is prevented from being exposed, thus avoiding interference with drilling.

[0015] Preferably, in the aforementioned easily replaceable and maintainable modular drill bit, the number of upper and lower toothed blocks is the same, and the multiple upper and lower toothed blocks are arranged alternately. The staggered arrangement of the upper and lower toothed blocks in this invention prevents loosening caused by overlapping splicing lines, resulting in stronger structural stability.

[0016] Preferably, in the aforementioned easily replaceable and maintainable modular drill bit, the tooth patterns of the upper tooth block, the lower tooth block, and the tooth surface limiting layer are identical, and the length directions of their peaks and troughs are all the same as the axial direction of the drill bit body. By setting the same tooth pattern structure, the uniformity of the overall structure is ensured, making the drill bit less prone to damage during operation.

[0017] Preferably, in the above-mentioned easily replaceable and maintainable modular drill bit, the drill bit body has a drilling protrusion at the center of its end face away from the connector, and diamond particles are embedded in the drilling protrusion. This can further improve the drilling effect of the drill bit.

[0018] Preferably, in the aforementioned easily replaceable and maintainable modular drill bit, an inner mounting hole is provided on the outer wall of the drill bit body at a position corresponding to the upper toothed block. A mating groove is provided on the side wall of the upper toothed block corresponding to the inner mounting hole. An inner support block is engaged in the mating groove. The inner support block is inserted into the inner mounting hole, and a support spring is pressed between the inner support block and the bottom wall of the inner mounting hole. To further improve the stability and strength of the modular drill bit structure, this invention adds an elastic support structure. On the one hand, this improves the engagement stability of the upper toothed block; on the other hand, when the drill bit rotates at high speed, the inner support block will be squeezed outward under the action of centrifugal force to compensate for gaps in the modular structure and increase the friction between the toothed blocks, thereby improving stability.

[0019] The present invention also provides a drilling tool, including the above-described easy-to-replace and maintain modular drill bit.

[0020] Through the above technical solution, the drill bit structure provided by the present invention utilizes the assembly structure of the modular drill bit, which has the advantages of easy maintenance, reduced cost, increased service life and improved drilling efficiency.

[0021] As can be seen from the above technical solution, compared with the prior art, the present invention discloses an easy-to-replace and maintain modular drill bit and its drilling tools, which has the following beneficial effects:

[0022] 1. The drill bit structure provided by the present invention has an upper toothed block and a lower toothed block detachably connected to the outside of the drill bit body. The wedge-shaped inclined surface simplifies the limiting connection structure. When the upper toothed block and the lower toothed block are damaged, they can be easily disassembled and replaced, which greatly reduces the cost and ensures the working efficiency of the drill bit.

[0023] 2. This invention uses the wedge-shaped inclined surface to make the tooth surface limiting layer limit the lower tooth block, which in turn limits the upper tooth block. As the layers stack up, the force exerted by the drill bit gradually decreases from the upper tooth block to the tooth surface limiting layer, making the tooth surface limiting layer less prone to breakage. As the bottom support structure, it has stronger stability, thereby ensuring the stability and structural strength of the overall outer layer assembly structure.

[0024] 3. The upper and lower toothed blocks of the present invention are connected by staggered arrangement, which can prevent the splicing lines from overlapping and thus prevent loosening, resulting in stronger structural stability.

[0025] 4. The elastic support structure provided by the present invention can improve the snapping stability of the upper toothed block on the one hand, and when the drill bit rotates at high speed, the inner support block will be squeezed outward under the action of centrifugal force to compensate for the gaps in the assembly structure, and can also increase the friction between the toothed blocks and improve stability.

[0026] 5. The drilling tool structure provided by this invention has the advantages of easy maintenance, reduced cost, increased service life and improved drilling efficiency. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0028] Figure 1 The attached figure is a structural schematic diagram of the modular drill bit provided by the present invention;

[0029] Figure 2 The attached figure is an exploded view of the assembled modular drill bit provided by the present invention;

[0030] Figure 3 The attached figure is a structural cross-sectional view of the assembled modular drill bit provided by the present invention;

[0031] Figure 4 The attached figure is a schematic diagram of the structure of the drill bit body provided by the present invention;

[0032] Figure 5 The attached figure is a schematic diagram of the upper toothed block provided by the present invention;

[0033] Figure 6 The attached figure is a schematic diagram of the structure of the lower toothed block provided by the present invention.

[0034] in:

[0035] 1-Drill bit body;

[0036] 11-Tooth surface limiting layer; 111-Snap-fit ​​groove; 12-Plug-in groove; 121-First threaded hole; 13-Second threaded hole; 14-Drilling protrusion; 15-Diamond particle; 16-Inner mounting hole; 17-Inner support block; 18-Support spring;

[0037] 2-Assemble the drilling layer;

[0038] 21-Upper toothed block; 211-Insertion block; 212-Inclined surface of upper toothed block; 213-First through hole; 2131-First countersunk hole; 214-Matching groove; 22-Lower toothed block; 221-Upper inclined surface of lower toothed block; 222-Lower inclined surface of lower toothed block; 223-Second through hole; 2231-Second countersunk hole; 23-First bolt; 24-Second bolt;

[0039] 3-Connector. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Example 1:

[0042] See appendix Figure 1 To be continued Figure 3 This invention discloses an easy-to-replace and maintain modular drill bit, comprising:

[0043] The drill bit body 1 has a connector 3 connected to one end. The side wall of the end of the drill bit body 1 connected to the connector 3 has a radially protruding tooth surface limiting layer 11. The annular end face of the tooth surface limiting layer 11 away from the connector 3 is inclined towards the connector 3 to form a snap-fit ​​groove 111. The edge of the end face of the drill bit body 1 away from the connector 3 has an insertion groove 12.

[0044] The assembled drill layer 2 includes upper toothed blocks 21 and lower toothed blocks 22. Multiple upper toothed blocks 21 are detachably connected to the outer wall of the drill bit body 1 at the end away from the connector 3. The top of each upper toothed block 21 has a plug 211 that engages with the insertion slot 12. The bottom of each upper toothed block 21 forms an inclined surface 212 with an angle similar to that of the insertion slot 111. Multiple upper toothed blocks 21 are arranged in a surrounding manner around the drill bit. Outside the main body 1; there are multiple lower toothed blocks 22, which are arranged around the outside of the drill bit body 1 and located between the upper toothed block 21 and the tooth surface limiting layer 11. The lower toothed blocks 22 are detachably connected to the drill bit body 1. The top of the lower toothed block 22 has an upper inclined surface 221 of the lower toothed block that overlaps and presses the inclined surface 212 of the upper toothed block, and the bottom of the lower toothed block 22 has a lower inclined surface 222 of the lower toothed block that inserts into the snap-fit ​​groove 111.

[0045] See appendix Figure 4 and attached Figure 5 The bottom surface of the insertion slot 12 has a first threaded hole 121, and the top of the upper toothed block 21 has a first through hole 213 corresponding to the first threaded hole 121. The first bolt 23 passes through the first through hole 213 and is fastened to the first threaded hole 121.

[0046] To further optimize the above technical solution, a first countersunk hole 2131 is formed at the end of the first through hole 213 away from the first threaded hole 121 to accommodate the bolt head of the first bolt 23.

[0047] See appendix Figure 4 and attached Figure 6 A second threaded hole 13 is provided on the outer wall of the drill bit body 1 at the position corresponding to the lower toothed block 22. A second through hole 223 corresponding to the second threaded hole 13 is provided on the lower toothed block 22. A second bolt 24 passes through the second through hole 223 and is fastened to the second threaded hole 13.

[0048] To further optimize the above technical solution, a second countersunk hole 2231 is formed at the end of the second through hole 223 away from the second threaded hole 13 to accommodate the bolt head of the second bolt 24.

[0049] In this embodiment, the number of upper toothed blocks 21 and lower toothed blocks 22 are the same, and multiple upper toothed blocks 21 and multiple lower toothed blocks 22 are arranged alternately.

[0050] To further optimize the above technical solution, the tooth patterns of the upper tooth block 21, the lower tooth block 22 and the tooth surface limiting layer 11 are consistent, and the length direction of their peaks and valleys is the same as the axial direction of the drill bit body 1.

[0051] To further optimize the above technical solution, the drill bit body 1 has a drilling protrusion 14 at the center of the end face away from the connector 3, and diamond particles 15 are embedded on the drilling protrusion 14.

[0052] See appendix Figure 2 To be continued Figure 4 An inner mounting hole 16 is provided on the outer side wall of the drill bit body 1 at the position corresponding to the upper toothed block 21. A mating groove 214 is provided on the side wall of the upper toothed block 21 corresponding to the inner mounting hole 16. An inner support block 17 is engaged in the mating groove 214. The inner support block 17 is inserted into the inner mounting hole 16. A support spring 18 is pressed between the inner support block 17 and the bottom wall of the inner mounting hole 16.

[0053] The installation method for the easy-to-replace and maintain modular drill bit provided in this embodiment is as follows:

[0054] See appendix Figure 4 This is a schematic diagram of the drill bit body 1. First, the attachment is installed. Figure 5 Before installing each upper toothed block 21, a support spring 18 and an inner support block 17 are placed in the inner mounting hole 16. Then, the insert 211 of the upper toothed block 21 is pre-inserted into the insertion slot 12 of the drill bit body 1. Then, the mating groove 214 of the upper toothed block 21 is inserted into the inner support block 17. Then, the insert 211 is fully pressed into the insertion slot 12, so that the mating groove 214 and the inner support block 17 achieve elastic fit. The first bolt 23 passes through the first through hole 213 and is fastened to the first threaded hole 121, thus completing the connection between the upper toothed block 21 and the drill bit body 1. The connection between all the upper toothed blocks 21 and the drill bit body 1 is completed in this way.

[0055] Then install the lower toothed block 22. First, insert the lower inclined surface 222 of the lower toothed block 22 into the snap-fit ​​slot 111. Then, the upper inclined surface 221 of the lower toothed block 22 and the upper inclined surface 212 of the upper toothed block 21 fit together, so that the lower toothed block 22 presses against the upper toothed block 21. Then, the second bolt 24 passes through the second through hole 223 and is fastened to the second threaded hole 13 to complete the connection between the lower toothed block 22 and the drill bit body 1. Follow this method to complete the connection between all the lower toothed blocks 22 and the drill bit body 1.

[0056] The easily replaceable and maintainable modular drill bit provided in this embodiment features a force that gradually decreases from the upper toothed block 21 to the tooth surface limiting layer 11 during use. This makes the tooth surface limiting layer 11 less prone to breakage. The upper toothed block 21, lower toothed block 22, and tooth surface limiting layer 11 are stacked layer by layer, with the tooth surface limiting layer 11 serving as the bottommost support structure, providing greater stability and higher structural strength. Furthermore, when the upper toothed block 21 and lower toothed block 22 are damaged, they can be easily disassembled and replaced, significantly reducing costs while ensuring the drill bit's working efficiency.

[0057] The elastic support structure provided in this embodiment can improve the snapping stability of the upper toothed block 21. On the other hand, when the drill bit rotates at high speed, the inner support block 17 will be squeezed outward under the action of centrifugal force to compensate for the gaps in the assembly structure and improve the friction between the toothed blocks, thereby improving stability.

[0058] This embodiment focuses on the features of the assembly structure. For example, the strength structure of the PDC drill bit and the water channel are conventional structures, and will not be described in detail in this embodiment.

[0059] Example 2:

[0060] This invention discloses a drilling tool, including an easy-to-replace and maintain modular drill bit as described in Embodiment 1.

[0061] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0062] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A modular drill bit that is easy to replace and maintain, characterized in that, include: The drill bit body (1) has a connector (3) connected to one end. The side wall of the end of the drill bit body (1) connected to the connector (3) has a radially protruding tooth surface limiting layer (11). The annular end face of the tooth surface limiting layer (11) away from the connector (3) is inclined towards the connector (3) to form a snap-fit ​​groove (111). The edge of the end face of the drill bit body (1) away from the connector (3) has an insertion groove (12). The assembled drill layer (2) includes an upper toothed block (21) and a lower toothed block (22). There are multiple upper toothed blocks (21). Each upper toothed block (21) is detachably connected to the outer wall of the drill bit body (1) away from the connector (3). The top of each upper toothed block (21) has a plug (211) that inserts into the insertion slot (12). The bottom of each upper toothed block (21) forms an inclined surface (212) with an angle similar to that of the insertion slot (111). Multiple upper toothed blocks (21) are arranged around the drill bit body. Outside the head body (1); there are multiple lower toothed blocks (22), which are arranged around the outside of the drill bit body (1) and located between the upper toothed block (21) and the tooth surface limiting layer (11). The lower toothed blocks (22) are detachably connected to the drill bit body (1). The top of the lower toothed block (22) has an upper inclined surface (221) of the lower toothed block that overlaps and presses the inclined surface (212) of the upper toothed block. The bottom of the lower toothed block (22) has a lower inclined surface (222) of the lower toothed block that is inserted into the snap-fit ​​slot (111). The bottom surface of the insertion slot (12) has a first threaded hole (121), and the top of the upper toothed block (21) has a first through hole (213) corresponding to the first threaded hole (121). The first bolt (23) passes through the first through hole (213) and is fastened to the first threaded hole (121). The outer wall of the drill bit body (1) is provided with a second threaded hole (13) at the position corresponding to the lower toothed block (22). The lower toothed block (22) is provided with a second through hole (223) corresponding to the second threaded hole (13). The second bolt (24) passes through the second through hole (223) and is fastened to the second threaded hole (13). An inner mounting hole (16) is provided on the outer side wall of the drill bit body (1) at the position corresponding to the upper toothed block (21). A mating groove (214) is provided on the side wall of the upper toothed block (21) corresponding to the inner mounting hole (16). An inner support block (17) is engaged in the mating groove (214). The inner support block (17) is inserted into the inner mounting hole (16). A support spring (18) is pressed between the inner support block (17) and the bottom wall of the inner mounting hole (16). When the drill bit rotates at high speed, the inner support block (17) will be squeezed outward under the action of centrifugal force to compensate for the gaps in the assembled structure. During installation, the insert (211) of the upper toothed block (21) is pre-inserted into the insertion slot (12) of the drill bit body (1), and then the mating groove (214) of the upper toothed block (21) is inserted into the inner support block (17). Then the insert (211) is fully pressed into the insertion slot (12), so that the mating groove (214) and the inner support block (17) achieve elastic fit.

2. The easily replaceable and maintainable modular drill bit according to claim 1, characterized in that, The first through hole (213) has a first countersunk hole (2131) at the end away from the first threaded hole (121) to accommodate the bolt head of the first bolt (23).

3. The easily replaceable and maintainable modular drill bit according to claim 1, characterized in that, The second through hole (223) has a second countersunk hole (2231) at the end away from the second threaded hole (13) to accommodate the bolt head of the second bolt (24).

4. The easily replaceable and maintainable modular drill bit according to claim 1, characterized in that, The number of upper toothed blocks (21) and lower toothed blocks (22) is the same, and multiple upper toothed blocks (21) and multiple lower toothed blocks (22) are arranged alternately.

5. The easily replaceable and maintainable modular drill bit according to claim 1, characterized in that, The tooth patterns of the upper tooth block (21), the lower tooth block (22) and the tooth surface limiting layer (11) are consistent, and the length direction of their peaks and valleys is the same as the axial direction of the drill bit body (1).

6. The easily replaceable and maintainable modular drill bit according to claim 1, characterized in that, The drill bit body (1) has a drilling protrusion (14) at the center of the end face away from the connector (3), and diamond particles (15) are embedded on the drilling protrusion (14).

7. A drilling tool, characterized in that, Includes an easily replaceable and maintainable modular drill bit as described in any one of claims 1-6.

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