Drill bit and drilling apparatus

Abstract

The application discloses a drill bit and a drilling device. The drill bit comprises a drill bit body and a plurality of blades. The drill bit body is provided with a drilling fluid cavity. The plurality of blades are arranged on the drill bit body and are distributed along the circumferential direction of the drill bit body. Two adjacent blades and the drill bit body form a chip groove. The opposite surfaces of the two adjacent blades form a first side wall and a second side wall of the chip groove, respectively. The surface of the drill bit body between the two adjacent blades forms a bottom wall of the chip groove. At least one of the first side wall, the second side wall and the bottom wall of the chip groove is provided with a plurality of first liquid injection holes. The plurality of first liquid injection holes are in communication with the drilling fluid cavity. The plurality of first liquid injection holes are distributed from the tail end of the chip groove to the front end of the chip groove. The above scheme can solve the problem that the drill bit cannot overcome the mud ball phenomenon in the drilling process in the related art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drilling equipment design, and in particular to a drill bit and drilling equipment. BACKGROUND

[0002] A PDC (polycrystalline diamond composite) drill bit is a kind of drill bit that uses a PDC to scrape or shear rock to achieve rock breaking, and is one of the rock breaking tools with a higher frequency of use in current drilling engineering. Among them, the PDC drill bit has a higher frequency of use in the drilling engineering of medium-soft formations. A junk slot is formed between each blade of the PDC drill bit, and the junk slot is mainly used to facilitate the carrying of rock cuttings from the bottom of the well by the drilling fluid. When encountering soft mudstone formations or soft and hard alternating formations, a larger amount of rock cuttings generated by the PDC drill bit can easily adhere and gradually coalesce in the junk slot, thereby blocking the junk slot.

[0003] The accumulation of rock cuttings on the surface of the drill bit can cause the drill bit to have a mud ball phenomenon. The mud ball phenomenon of the drill bit can cause the rock drilling capacity of the drill bit to decrease significantly, resulting in low rock breaking efficiency, and even the drill bit cannot be effectively drilled. At the same time, the mud ball phenomenon can cause the cutting teeth on the blades of the drill bit to not directly contact the drilling fluid, thereby failing to be effectively cooled and causing the cutting teeth to wear out, which ultimately shortens the service life.

[0004] In order to alleviate the mud ball phenomenon, the related art can only use the jet flow of the jet hole to flush the mud ball. When the mud ball phenomenon is more serious, it is difficult for the drilling fluid sprayed through the jet hole to flush the mud ball, and at this time the drill bit basically has no drilling capacity, so the drill bit needs to be replaced by tripping, which will obviously reduce the drilling efficiency and increase the drilling cost.

[0005] Of course, it is not limited to the PDC drill bit, and it is not limited to the drilling scene of medium-soft formations. The same problem also exists in other types of drill bits or other drilling scenes. How to alleviate the mud ball phenomenon of the drill bit during drilling is a technical problem that needs to be solved by technicians in the related field. SUMMARY

[0006] The embodiments of the present application disclose a drill bit and drilling equipment to solve the problem of the drill bit in the related art that cannot overcome the mud ball phenomenon during drilling.

[0007] In order to solve the above technical problem, the embodiments of the present application disclose the following technical solutions:

[0008] A drill bit, comprising a drill bit body and a plurality of blades, a drilling fluid cavity is arranged in the drill bit body, the plurality of blades are arranged on the drill bit body and are distributed at intervals along the circumferential direction of the drill bit body, wherein:

[0009] Two adjacent said blades form a flute with said drill bit body, the opposite surfaces of two adjacent said blades form a first sidewall and a second sidewall of said flute respectively, and the surface of said drill bit body between two adjacent said blades forms a bottom wall of said flute;

[0010] At least one of said first sidewall, said second sidewall and said bottom wall of said flute is provided with a plurality of first liquid injection holes, said plurality of first liquid injection holes are in communication with said drilling fluid cavity, and said plurality of first liquid injection holes are distributed from the tail end of said flute to the front end of said flute.

[0011] Optionally, in the above-mentioned drill bit, said first sidewall, said second sidewall and said bottom wall of said flute are each provided with a plurality of said first liquid injection holes.

[0012] Optionally, in the above-mentioned drill bit, the diameter of said first liquid injection hole is greater than or equal to 0.5mm and less than or equal to 5mm; and / or,

[0013] The distribution density of said first liquid injection hole is greater than or equal to 2500 per square meter.

[0014] Optionally, in the above-mentioned drill bit, at least one of said first sidewall, said second sidewall and said bottom wall of said flute is provided with a plurality of recesses, and said first liquid injection hole is arranged in said plurality of recesses.

[0015] Optionally, in the above-mentioned drill bit, the diameter of said first liquid injection hole and the radius of the circumscribed circle of said recess satisfy the following relationship: R / 6≤d≤R / 3, wherein d is the diameter of said first liquid injection hole and R is the radius of the circumscribed circle of said recess.

[0016] Optionally, in the above-mentioned drill bit, the area outside said recess in said flute is provided with said first liquid injection hole; and / or,

[0017] The number of said first liquid injection holes arranged in said plurality of recesses is not all equal; or, the number of said first liquid injection holes arranged in said plurality of recesses is all equal; or, the number of said first liquid injection holes arranged in said plurality of recesses is not equal.

[0018] Optionally, in the above-mentioned drill bit, a communication groove is arranged in said flute, two adjacent said recesses are communicated through said communication groove, and the groove width of said communication groove is less than half of the minimum length of said recess.

[0019] Optionally, in the above-mentioned drill bit, a plurality of said recesses arranged in said flute are sequentially communicated to form a strip-shaped groove structure.

[0020] Optionally, in the above-mentioned drill bit, the first injection hole is provided in the central region of the front end of the drill bit body, and the central region is a region defined with the central axis of the drill bit body as the center and the radius being 1 / 3 of the radius of the drill bit.

[0021] A drilling apparatus, comprising the drill bit described above.

[0022] The technical solutions disclosed in the embodiments of the present invention have the following technical effects:

[0023] The drill bit disclosed in this invention, by opening multiple first injection holes in at least a portion of the inner wall of the cuttings removal groove, and connecting these multiple first injection holes to the drilling fluid chamber, allows drilling fluid to continuously flow through the first injection holes during drilling. The drilling fluid ejected from the first injection holes has a certain pressure, and the large number of first injection holes creates a "fluid cushion" effect, forming a hydraulic barrier. The drilling fluid flowing from the multiple first injection holes forms a hydraulic barrier that lubricates the cuttings in the cuttings removal groove, significantly reducing the adhesion and friction between the cuttings and the inner wall of the groove. This facilitates the movement of cuttings within the groove, effectively preventing blockage and alleviating mud packing, ultimately improving the drilling efficiency of the drill bit.

[0024] Since the drill bit disclosed in the embodiments of the present invention can effectively alleviate the mud packing phenomenon, it can avoid operations such as lifting the drill and changing the drill bit, and will not lead to frequent drill bit replacement due to increased drill bit wear, thus ultimately reducing the cost of drilling operations. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the first drill bit disclosed in the embodiments of the present invention;

[0026] Figure 2 yes Figure 1 Top view;

[0027] Figure 3 yes Figure 2 Sectional view along axis AA;

[0028] Figure 4 This is a schematic diagram of the structure of the second type of drill bit disclosed in the embodiments of the present invention;

[0029] Figure 5 This is a schematic diagram of the structure of the third type of drill bit disclosed in the embodiments of the present invention;

[0030] Figure 6 This is a schematic diagram of the structure of the fourth type of drill bit disclosed in the embodiments of the present invention;

[0031] Figure 7is a structure schematic view of a fifth drill bit disclosed by the embodiment of the present application;

[0032] Figure 8 is Figure 7 a plan view;

[0033] Figures 9 to 14 are respectively Figure 7 enlarged schematic views of the I part of the drill bit shown in

[0034] Figure 15 is a schematic view of the debris passing through the recess;

[0035] Figure 16 is a structure schematic view of the drill bit disclosed by the embodiment of the present application, in which a first liquid injection hole is arranged in the central area B of the front end of the drill bit;

[0036] Figure 17 and Figure 18 are respectively partial structure development schematic views of the drill bit with a slot structure having different extension directions;

[0037] Figure 19 and Figure 20 are respectively Figure 7 enlarged schematic views of the I part of the drill bit shown in

[0038] Figure 21 is a structure schematic view of a sixth drill bit disclosed by the embodiment of the present application;

[0039] Figures 22 to 29 are respectively partial enlarged schematic views of the sixth drill bit disclosed by the embodiment of the present application, in which the shape of the recess is different, or only the first liquid injection hole is arranged in the recess, or the first liquid injection hole is arranged in the recess and outside the recess.

[0040] The labels of the components in the drawings are as follows:

[0041] 10-drill bit body, 11-drilling fluid cavity, 12-threaded connection structure, 13-connection channel, 20-blade,

[0042] 30-cutting tooth,

[0043] 01-flushing groove, 011-first side wall, 012-second side wall, 013-bottom wall,

[0044] 02-first liquid injection hole,

[0045] 03-recess,

[0046] 04-second liquid injection hole, 05-communication groove, 06-slot structure,

[0047] 40-debris, 50-drilling fluid. DETAILED DESCRIPTION

[0048] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions will be described below in connection with the specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0049] The technical solutions disclosed by the various embodiments of the present application will be described in detail below in connection with the drawings.

[0050] Please refer to Figures 1 to 29 The embodiments of the present application disclose a drill bit, and the disclosed drill bit is applied to a drilling device. The disclosed drill bit can be a PDC drill bit, or can be other kinds of drill bits, and the embodiments of the present application do not limit the specific kind of the drill bit.

[0051] The drill bit disclosed by the embodiments of the present application comprises a drill bit body 10 and a plurality of blades 20, and can further comprise a plurality of cutting teeth 30, as shown in Figure 1 and Figure 2 .

[0052] The drill bit body 10 is the main structure of the drill bit, and the tail end of the drill bit body 10 can be provided with a connecting structure, so as to realize the connection of the drill bit and the drill rod of the drilling device. Optionally, the connecting structure provided at the tail end of the drill bit body 10 can be a clamping structure, or can be a threaded connection structure 12, and the embodiments of the present application do not limit the specific kind of the connecting structure. The front end of the drill bit body 10 is the drilling end, and the front end of the drill bit body 10 can provide a setting position for the plurality of blades 20.

[0053] The drill bit body 10 is provided with a drilling fluid cavity 11, as shown in Figure 3 After the drill bit is connected with the drill rod, the rod cavity of the drill rod will be communicated with the drilling fluid cavity 11, and the drilling fluid will enter the drilling fluid cavity 11 through the rod cavity, so as to realize the delivery of the drilling fluid 50 to the drill bit.

[0054] The plurality of cutting teeth 30 can be fixed on the plurality of blades 20, and specifically, one or more cutting teeth 30 can be fixed on each blade 20. In the specific drilling process, the cutting teeth 30 play a cutting role, so as to strip off the rock debris 40. The cutting teeth 30 can be fixed on the corresponding blades 20 by welding, one-piece molding manufacturing, connecting piece connection and the like, and the embodiments of the present application do not limit the specific fixing mode between the blades 20 and the cutting teeth 30.

[0055] A plurality of blades 20 are arranged on the drill bit body 10, specifically, the plurality of blades 20 protrude from the surface of the drill bit body 10. Alternatively, the plurality of blades 20 can be fixedly arranged on the drill bit body 10 by welding or integral manufacturing, and the specific connection mode between the plurality of blades 20 and the drill bit body 10 is not limited in the embodiments of the present application.

[0056] In the embodiments of the present application, the plurality of blades 20 are spaced apart along the circumferential direction of the drill bit body 10. Two adjacent blades 20 form a chip flute 01 with the drill bit body 10, as shown in FIG. 1. Figure 2 As shown in FIG. 1, the chip flute 01 is at least two. The opposite surfaces of the two adjacent blades 20 form a first side wall 011 and a second side wall 012 of the chip flute 01, as shown in FIG. 1. Figures 4 to 7 As shown in FIG. 1, the surface of the drill bit body 10 between the two adjacent blades 20 forms a bottom wall 013 of the chip flute 01. Figures 4 to 7 It should be noted that the bottom wall 013 of the chip flute 01 refers to the area of the inner wall of the chip flute 01 opposite the slot opening of the chip flute 01. The first side wall 011 and the second side wall 012 of the chip flute 01 refer to the two areas of the inner wall of the chip flute 01 forming the slot opening of the chip flute 01. The first side wall 011 and the second side wall 012 generally extend helically along the central axis direction of the drill bit.

[0057] At least one of the first side wall 011 of the chip flute 01, the second side wall 012 of the chip flute 01 and the bottom wall 013 of the chip flute 01 is provided with a plurality of first liquid injection holes 02. The plurality of first liquid injection holes 02 are in communication with the drilling fluid cavity 11. The plurality of first liquid injection holes 02 are distributed from the tail end of the chip flute 01 to the front end of the chip flute 01. It should be noted that the front end refers to one end facing the drilling direction of the drill bit. The tail end is the other end opposite the front end.

[0058] In the embodiments of the present application, in each chip flute 01, a part of the plurality of first liquid injection holes 02 can be directly in communication with the drilling fluid cavity 11, as shown in FIG. 1. Figure 3 Of course, another part of the first liquid injection holes 02 can be far away from the drilling fluid cavity 11, for which, in other embodiments, the drill bit body 10 can be provided with a connecting channel 13 for connecting the other part of the first liquid injection holes 02 with the drilling fluid cavity 11, which does not need to open a too long first liquid injection hole 02, thereby making it easy to open the first liquid injection hole 02 on the drill bit. Of course, all the first liquid injection holes 02 in each chip flute 01 can be directly in communication with the drilling fluid cavity 11 or indirectly in communication with the drilling fluid cavity 11 through the connecting channel 13, and the embodiments of the present application are not limited.

[0059] In the drill bit disclosed in the embodiments of the present application, the front end of the drill bit body 10 is also provided with a plurality of second liquid injection holes 04, the second liquid injection holes 04 are the existing liquid injection holes in the drill bit, that is, the injection holes described in the background art, compared with the first liquid injection holes 02 which are micro-holes, the second liquid injection holes 04 are large holes, and the plurality of second liquid injection holes 04 are in communication with the drilling fluid cavity 11. The diameter of the second liquid injection hole 04 is larger than that of the first liquid injection hole 02, and the second liquid injection hole 04 is the main outflow hole of the drilling fluid 50. In the specific drilling process, the drilling fluid 50 is mainly injected out of the second liquid injection hole 04 and then enters the bottom of the well, and flows back to the ground through the annulus (i.e. annular gap) formed between the drilling equipment and the well wall, thereby taking out the cuttings 40 generated in the drilling process out of the well.

[0060] The diameter of the first liquid injection hole 02 is much smaller than that of the second liquid injection hole 04. In the specific drilling process, a small amount of drilling fluid 50 is injected outward through the plurality of first liquid injection holes 02, thereby forming a water film on the surface of the drill bit.

[0061] The drill bit disclosed in the embodiments of the present application is provided with a plurality of first liquid injection holes 02 in at least part of the inner wall of the junk slot 01, and the plurality of first liquid injection holes 02 are in communication with the drilling fluid cavity 11. In the drilling process, the first liquid injection hole 02 is always passed through by the drilling fluid, and the drilling fluid 50 injected out of the first liquid injection hole 02 has a certain pressure, and the number of first liquid injection holes 02 is large, so that the "liquid cushion" effect can be generated, that is, a layer of hydraulic barrier is formed, which can generate impact force and supporting force on the cuttings 40 in the junk slot 01, and the cuttings 40 about to be adhered in the junk slot 01 or already adhered in the junk slot 01 are lifted up, that is, a kind of hydraulic barrier effect is generated. The drilling fluid 50 flowing out of the plurality of first liquid injection holes 02 forms a hydraulic barrier, and the hydraulic barrier can play a lubricating role on the cuttings 40 in the junk slot 01, so that the adhesion and friction between the cuttings 40 and the inner wall of the junk slot 01 are greatly reduced, which is more conducive to the migration of the cuttings 40 in the junk slot 01, thereby effectively preventing the junk slot 01 from being blocked, achieving the purpose of relieving the mud cake phenomenon, and finally improving the drilling efficiency of the drill bit.

[0062] Since the drill bit disclosed in the embodiments of the present application can better relieve the mud cake phenomenon, the operation of lifting the drill and replacing the drill bit can be avoided, and the frequent replacement of the drill bit due to the aggravation of the drill bit wear can also be avoided, and finally the cost of the drilling work can be reduced.

[0063] As described above, at least one of the first side wall 011 of the junk slot 01, the second side wall 012 of the junk slot 01 and the bottom wall 013 of the junk slot 01 can be provided with a plurality of first liquid injection holes 02. As shown in the first embodiment, only the first side wall 011 of the junk slot 01 is provided with a plurality of first liquid injection holes 02. As shown in the second embodiment, only the second side wall 012 of the junk slot 01 is provided with a plurality of first liquid injection holes 02. As shown in the third embodiment, only the bottom wall 013 of the junk slot 01 is provided with a plurality of first liquid injection holes 02. As shown in the fourth embodiment, the first side wall 011 of the junk slot 01, the second side wall 012 of the junk slot 01 and the bottom wall 013 of the junk slot 01 are all provided with a plurality of first liquid injection holes 02. Figure 4 Figure 5 ​As shown in the second embodiment, only the second sidewall 012 of the junk slot 01 is provided with a plurality of first liquid injection holes 02. As shown in FIG. 2B, the first liquid injection holes 02 are arranged in a plurality of rows along the second sidewall 012 of the junk slot 01. Figure 6 As shown in the third embodiment, only the bottom wall 013 of the junk slot 01 is provided with a plurality of first liquid injection holes 02. Of course, in a fourth embodiment, any two of the first sidewall 011, the second sidewall 012 and the bottom wall 013 of the junk slot 01 are provided with a plurality of first liquid injection holes 02.

[0064] In order to increase the coverage area of the hydraulic barrier formed by the drilling fluid flowing out of the plurality of first liquid injection holes 02, in a more preferred embodiment, the first sidewall 011, the second sidewall 012 and the bottom wall 013 of the junk slot 01 are all provided with a plurality of first liquid injection holes 02, as shown in FIG. 2C. Figure 7 and Figure 8 In this case, the plurality of first liquid injection holes 02 are arranged in each region of the inner wall of the junk slot 01, so that more first liquid injection holes 02 can be arranged in the junk slot 01, and more first liquid injection holes 02 can flow out more drilling fluid 50, so as to better lubricate the cuttings 40, further reduce the adhesion and friction between the inner wall of the junk slot 01 and the cuttings 40, and further facilitate the migration of the cuttings 40 in the junk slot 01, so as to better alleviate the balling phenomenon.

[0065] In the embodiments of the present application, the first liquid injection holes 02 have a small diameter, and the first liquid injection holes 02 are essentially pinholes. The first liquid injection holes 02 can be circular holes (as shown in FIG. 2D), Figures 9 to 14 Figures 17 to 20 and Figures 22 to 29 The first liquid injection holes 02 can also be triangular holes, square holes, rectangular holes, polygonal holes with more sides, or other shaped holes (such as elliptical holes, etc.), and the embodiments of the present application do not limit the specific shape of the first liquid injection holes 02. In a more optional embodiment, the first liquid injection holes 02 are circular holes, which are beneficial to the outflow of the drilling fluid 50. In the embodiments of the present application, the diameter of the first liquid injection holes 02 can be greater than or equal to 0.5 mm and less than or equal to 5 mm. The distribution density of the first liquid injection holes 02 can be greater than or equal to 2500 per square meter. The first liquid injection holes 02 with such a distribution density are more likely to form a hydraulic barrier.

[0066] ​The size of the first liquid injection hole 02 on the drill bit can be determined according to the size of the drill bit. The smaller the size of the drill bit, the smaller the surface of the chip flute 01 of the drill bit, and only a smaller first liquid injection hole 02 can be selected. The larger the size of the drill bit, the larger the surface of the chip flute 01 of the drill bit, and a larger first liquid injection hole 02 can be selected. As described above, the distribution density of the first liquid injection hole 02 is not less than 2500 per square meter. In the first embodiment, when the diameter of the first liquid injection hole 02 is 1 mm, the distribution density of the first liquid injection hole 02 on the drill bit can reach 250000 per square meter. In the second embodiment, when the diameter of the first liquid injection hole 02 is 3 mm, the distribution density of the first liquid injection hole 02 on the drill bit can reach 62500 per square meter. In the third embodiment, when the diameter of the first liquid injection hole 02 is 5 mm, the distribution density of the first liquid injection hole 02 on the drill bit is 22500 per square meter.

[0067] When the diameter of the first liquid injection hole 02 is between 1 mm and 3 mm, the minimum density that the first liquid injection hole 02 can reach on the drill bit is 62500 per square meter, and when the diameter of the first liquid injection hole 02 is between 3 mm and 5 mm, the minimum density that the first liquid injection hole 02 can reach on the drill bit is 22500 per square meter. With different sizes of drill bits, different diameters of the first liquid injection hole 02 are selected, and the minimum distribution density to be reached is different.

[0068] In a further technical solution, at least one of the first side wall 011 of the chip flute 01, the second side wall 012 of the chip flute 01 and the bottom wall 013 of the chip flute 01 can be provided with a plurality of recesses 03, and the plurality of recesses 03 are provided with the first liquid injection hole 02.

[0069] As shown in the first embodiment, only the first side wall 011 of the chip flute 01 is provided with a plurality of recesses 03. As shown in the second embodiment, only the second side wall 012 of the chip flute 01 is provided with a plurality of recesses 03. As shown in the third embodiment, only the bottom wall 013 of the chip flute 01 is provided with a plurality of recesses 03. Of course, in the fourth embodiment, any two of the first side wall 011, the second side wall 012 and the bottom wall 013 are provided with a plurality of recesses 03. As shown in the more preferred solution, the first side wall 011, the second side wall 012 and the bottom wall 013 are all provided with a plurality of recesses 03, so that the technical effect brought by the recesses 03 to the drill bit is more significant. Figure 4 Figure 5 Figure 6 Figures 7 to 8

[0070] ​​​​In one alternative embodiment, each recess 03 on the drill bit contains a first injection hole 02. In another alternative embodiment, each recess 03 on the drill bit contains multiple first injection holes 02. In yet another alternative embodiment, some recesses 03 on the drill bit may contain one first injection hole 02, while other recesses 03 may contain multiple first injection holes 02, such as... Figures 8 to 14 As shown, the embodiments of the present invention do not limit the specific number of the first spray holes 02 opened in the pit 03.

[0071] like Figure 15 As shown, the recess 03 allows the drilling fluid 50 ejected from the first injection hole 02 to be collected more in the recess 03, thereby allowing the hydraulic barrier formed on the drill bit to store more drilling fluid 50 in the recess 03, which is more conducive to forming a more stable "liquid cushion" effect. The recess 03 can store a certain amount of drilling fluid 50, which can better lubricate the rock cuttings 40 flowing over the surface of the cuttings discharge groove 01, and can better reduce the adhesion of rock cuttings 40, thus facilitating the discharge of rock cuttings 40.

[0072] In this embodiment of the invention, the pit 03 can be a regular shape or an irregular shape (such as...). Figure 19 , Figure 20 , Figure 24 , Figure 25 , Figure 28 and Figure 29 (As shown), but not limited to Figure 19 , Figure 20 , Figure 24 , Figure 25 , Figure 28 and Figure 29 The irregular shape shown in this embodiment of the invention does not limit the specific shape of the pit 03. Optionally, the shape of the pit 03 can be elliptical (e.g., Figure 9 , Figure 11 , Figure 13 , Figure 22 and Figure 26 As shown), circular (as shown) Figure 10 , Figure 12 , Figure 14 , Figure 23 , Figure 27 As shown), polygons (e.g., squares, rectangles, etc.). Those skilled in the art can design the specific shape of the recess 03 according to user requirements.

[0073] like Figure 19 , Figure 20 , Figure 24 , Figure 25 , Figure 28 and Figure 29As shown in the figure, in an irregularly shaped pit 03, the edge of the pit 03 can include a circular arc-shaped edge and a straight edge, and the two ends of the straight edge are respectively connected with the two ends of the circular arc-shaped edge to form the edge of the pit 03.

[0074] The diameter of the first liquid injection hole 02 cannot be too small, otherwise it is easy to be blocked by the rock debris 40 and hinder the outflow of the drilling fluid 50, and it is not easy to process, of course, the first liquid injection hole 02 cannot occupy a large area in the pit 03 to affect the water storage capacity of the pit 03. In an alternative, the diameter of the first liquid injection hole 02 and the radius of the circumscribed circle of the pit 03 can have the following relationship: R / 6≤d≤R / 3, wherein d is the diameter of the first liquid injection hole 02, and R is the radius of the circumscribed circle of the pit 03. It should be noted that in the embodiment of the present application, the circumscribed circle of the pit 03 refers to a circle made with the outermost end of the pit 03, and any point of the pit 03 is in the circle, and the point of any end of the pit 03 is in the circle or on the circle. The radius of this circle is the radius of the circumscribed circle of the pit 03.

[0075] In the drill bit disclosed in the embodiment of the present application, the first liquid injection hole 02 can be only provided in the pit 03 in the chip flute 01, as shown in Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 、 Figure 19 、 Figure 20 、 Figure 22 、 Figure 23 、 Figure 24 、 Figure 25 As shown in the figure. Of course, in order to further reduce the lubrication of the rock debris 40, in a further technical solution, the area outside the pit 03 in the chip flute 01 can also be provided with the first liquid injection hole 02. Specifically, the area outside the pit 03 in the chip flute 01 is provided with a plurality of first liquid injection holes 02, as shown in Figure 13 、 Figure 14 、 Figure 26 、 Figure 27 、 Figure 28 and Figure 29 .

[0076] The number of first liquid injection holes 02 provided in the plurality of pits 03 is not equal, as shown in Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 、 Figure 13 、 Figure 14 、 Figure 19 、 Figure 20 、 Figures 22 to 29As shown. Of course, in other embodiments, the number of first liquid injection holes 02 provided in each of the plurality of recesses 03 is equal. In other embodiments, the number of first liquid injection holes 02 provided in each of the plurality of recesses 03 is not equal. It should be noted that the number of first liquid injection holes 02 provided in each of the plurality of recesses 03 is not limited by the embodiments of the present application.

[0077] In addition, in the drill bit disclosed by the embodiments of the present application, the plurality of recesses 03 provided in the chip flute 01 can be arranged in a regular arrangement or in an irregular arrangement, and the arrangement of the plurality of recesses 03 is not limited by the embodiments of the present application. In order to facilitate manufacturing, the plurality of recesses 03 provided in the chip flute 01 can be arranged in a regular manner, for example, the plurality of recesses 03 provided in the chip flute 01 can be arranged in a row-column manner, as shown in Figure 9 、 Figure 10 、 Figure 13 、 Figure 14 、 Figure 19 、 Figure 22 、 Figure 23 、 Figure 24 、 Figure 26 、 Figure 27 and Figure 28 For another example, the plurality of recesses 03 provided in the chip flute 01 can be distributed in a plurality of rows, and adjacent two rows of recesses 03 are staggered, as shown in Figure 11 、 Figure 12 、 Figure 20 、 Figure 25 and Figure 29 .

[0078] Similarly, in the case where at least three first liquid injection holes 02 are provided in the recess 03, the first liquid injection holes 02 in the recess 03 can be arranged regularly or irregularly. For example, in the case where three first liquid injection holes 02 are provided in the recess 03, the three first liquid injection holes 02 can be distributed in the recess 03 in a triangular distribution manner, as shown in Figures 9 to 14 , Figures 19 to 20 and Figures 22 to 29 .

[0079] In further technical solutions, the chip flute 01 can further be provided with a communication groove 05, and adjacent two recesses 03 can be communicated through the communication groove 05, as shown in Figures 21 to 29 The communication groove 05 serves to communicate adjacent two recesses 03, which can further facilitate the flow of the hydraulic barrier formed by the drilling fluid, so that the lubricating effect is better, thereby further facilitating the reduction of the friction between the cuttings 40 and the chip flute 01, and achieving the purpose of removing the balling more quickly.

[0080] The connecting channel 05 should not be too wide. If the connecting channel 05 is too wide, its size will be close to that of the pit 03, which may lead to poor connectivity. Therefore, in a preferred embodiment, when the width of the connecting channel 05 is less than half of the shortest length L of the pit 03, a siphon-like effect is easily generated. The drilling fluid flowing into the pit 03 from the first injection hole 02 is more likely to flow into the narrower connecting channel 05 under the action of suction, thereby improving the flow efficiency of the drilling fluid.

[0081] It should be explained that, in this paper, the connecting groove 05 is a through groove open at both ends, and the width of the connecting groove 05 refers to the distance between the two sidewalls extending in the through direction of the connecting groove 05. The shortest length L of the pit 03 refers to the minimum value of the distance between any two endpoints of the edge of the pit 03. When the shape of the pit 03 is circular, the shortest length L of the pit 03 is the diameter of the pit 03. When the shape of the pit 03 is elliptical, the shortest length L of the pit 03 is the length of the minor axis of the pit 03.

[0082] Of course, the width of the connecting groove 05 should not be too small, as it would be difficult to process if the width of the connecting groove 05 is too small. Based on this, in a specific embodiment, the width of the connecting groove 05 can be w, where 0.5mm ≤ w ≤ 3mm.

[0083] As mentioned above, the chip removal groove 01 has multiple recesses 03. These recesses 03 can be spaced out or distributed without spacing. Please refer to [reference needed]. Figure 17 and Figure 18 As shown, multiple pits 03 can be connected sequentially to form a strip-shaped trough structure 06. Specifically, multiple pits 03 within each chip removal trough 01 can form multiple strip-shaped trough structures 06, which are more conducive to the movement of rock cuttings 40. In this structure, multiple large strip-shaped pits 03 can be formed within the chip removal trough 01, which is more conducive to reducing the friction between the chip removal trough 01 and the rock cuttings 40, forming a more stable hydraulic barrier, which is beneficial to the movement of rock cuttings 40 within the chip removal trough 01, and thus can further alleviate the mud-packing phenomenon.

[0084] In order to better realize the discharge of the cuttings 40, in a more preferred scheme, the through direction of the groove structure 06 can be consistent with the through direction of the discharge groove 01, or the through direction of the groove structure 06 can form an acute angle with the through direction of the discharge groove 01. For example, the included angle between the through direction of the groove structure 06 and the through direction of the discharge groove 01 can be greater than or equal to 30° and less than or equal to 90°. Such a structure can make the extension direction of the groove structure 06 consistent with the extension direction of the discharge groove 01, thereby facilitating the drilling fluid 50 sprayed by the first liquid jet hole 02 in the groove structure 06 to slide along the groove structure 06, indirectly making the hydraulic barrier flow along the discharge direction of the cuttings 40, thereby more easily guiding the cuttings 40 along the discharge groove 01, and ultimately facilitating the discharge of the cuttings 40. This can further alleviate the phenomenon of mud balling of the drill bit during drilling.

[0085] Please refer to Figure 17 and Figure 18 In another more preferred scheme, the extension direction of the groove structure 06 can form an acute angle with the drilling direction of the drill bit (the drilling direction is parallel to the central axis of the drill bit) (as shown in Figure 17 ), or can be consistent with the drilling direction of the drill bit (as shown in Figure 18 ), and in a specific drilling process, the cuttings 40 are generally discharged in a direction away from the drilling direction, and the extension direction of the groove structure 06 forms an acute angle or is consistent with the drilling direction of the drill bit, so that the discharge direction of the cuttings 40 is not blocked too much, thereby facilitating the discharge of the cuttings. It should be noted that Figure 17 and Figure 18 The arrow C in the figure schematically indicates the drilling direction of the drill bit.

[0086] Please refer to Figure 16 , in the central region B of the front end of the drill bit body 10, part of the central region B can be located in the discharge groove 01, and part of the central region B is not in the discharge groove 01. Considering that the front end of the drill bit body 10 is the end of the drill bit body 10 facing the drilling direction, and the resistance during drilling is also relatively large, and the cuttings 40 are more likely to adhere, based on this, in an optional scheme, the first liquid jet hole 02 can also be arranged in the central region B of the front end of the drill bit body 10. It should be noted that herein, the central region B is a region with the central axis of the drill bit body 10 as the center and a radius of 1 / 3 of the radius of the drill bit.

[0087] Based on the drill bit disclosed in the embodiments of the present application, the embodiments of the present application disclose a drilling device, and the disclosed drilling device comprises the drill bit described in the above embodiments. Of course, it should be noted that, in view of the technical effects brought by the drill bit described in the above embodiments, the drilling device disclosed in the embodiments of the present application also has corresponding technical effects, and the description of the technical effects can be referred to above. Considering the brevity of writing, it will not be repeated here.

[0088] The embodiments of the present application are described above in combination with the drawings, but the present application is not limited to the above specific embodiments, and the above specific embodiments are only illustrative but not restrictive. Those skilled in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the scope protected by the claims.

Claims

1. A drill bit, characterized by The drill bit body (10) is provided with a drilling fluid cavity (11), and a plurality of blades (20) are arranged on the drill bit body (10) and are distributed along the circumferential direction of the drill bit body (10), wherein: Two adjacent blades (20) and the drill bit body (10) form a junk slot (01), and the opposite surfaces of the two adjacent blades (20) form a first side wall (011) and a second side wall (012) of the junk slot (01), respectively, and the surface of the drill bit body (10) between the two adjacent blades (20) forms a bottom wall (013) of the junk slot (01); At least one of the first side wall (011), the second side wall (012) and the bottom wall (013) of the junk slot (01) is provided with a plurality of first liquid injection holes (02), the plurality of first liquid injection holes (02) are in communication with the drilling fluid cavity (11), and the plurality of first liquid injection holes (02) are distributed from the tail end of the junk slot (01) to the front end of the junk slot (01). The first side wall (011), the second side wall (012) and the bottom wall (013) of the junk slot (01) are all provided with a plurality of first liquid injection holes (02). At least one of the first side wall (011), the second side wall (012) and the bottom wall (013) of the junk slot (01) is provided with a plurality of pits (03), and the first liquid injection hole (02) is arranged in the plurality of pits (03).

2. The drill bit of claim 1, wherein, The diameter of the first liquid injection hole (02) is greater than or equal to 0.5mm and less than or equal to 5mm; and / or, The distribution density of the first liquid injection hole (02) is greater than or equal to 2500 per square meter.

3. The drill bit of claim 1, wherein, The diameter of the first liquid injection hole (02) and the radius of the circumscribed circle of the pit (03) have the following relationship: R / 6≤d≤R / 3, wherein d is the diameter of the first liquid injection hole (02), and R is the radius of the circumscribed circle of the pit (03).

4. The drill bit of claim 1, wherein, The area outside the pit (03) in the junk slot (01) is provided with the first liquid injection hole (02); and / or, The number of first liquid injection holes (02) arranged in the plurality of pits (03) is not all equal; or, the number of first liquid injection holes (02) arranged in the plurality of pits (03) is all equal; or, the number of first liquid injection holes (02) arranged in the plurality of pits (03) is not all equal.

5. The drill bit of claim 1, wherein, The junk slot (01) is provided with a communication groove (05), and two adjacent pits (03) are communicated through the communication groove (05), and the groove width of the communication groove (05) is less than half of the minimum length of the pit (03).

6. The drill bit of claim 1, wherein, The plurality of pits (03) arranged in the junk slot (01) are sequentially communicated to form a strip-shaped groove structure (06).

7. The drill bit of claim 1, wherein, The first liquid injection hole (02) is arranged in a central region (B) of a front end of the drill bit body (10), the central region (B) being a region determined with a center axis of the drill bit body (10) as a center and a radius accounting for 1 / 3 of a radius of the drill bit.

8. A drilling apparatus, characterized by The drill bit comprises the drill bit according to any one of claims 1 to 7.

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