Drill bit for directional drilling

Abstract

The drill bit comprises a drill bit body, a plurality of bit legs are evenly arranged at one end of the drill bit body around the axis of the drill bit body, and one end of each bit leg is rotationally connected with a cone; a plurality of crushing teeth are arranged on each cone; a connecting frame coaxial with the drill bit body is further arranged on the drill bit body, a plurality of scraping plates used for scraping mud blocks are arranged on the connecting frame, and the scraping plates are matched with the tooth palms in shape. A flushing module is further arranged on the connecting frame, and the flushing module is right opposite to each tooth palm; according to the drill bit cleaning device, cleaning of mud blocks attached to the drill bit is achieved in the mode of combining scraping with high-pressure water flushing, the cleaning effect is good, and meanwhile the cleaning efficiency is high; by means of the structure, mud blocks attached to the whole roller cone can be rapidly cleaned within the half rotation period of one roller cone, on one hand, timeliness of mud block cleaning can be guaranteed, on the other hand, it is guaranteed that the side, used for drilling, of the roller cone is in the state without the mud blocks all the time, and therefore the crushing effect is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of oil drilling equipment, and in particular to a drill bit for directional drilling. Background Art

[0002] The roller drill bit is a key component for rock breaking and excavation, and is widely used in oil, natural gas, geothermal, salt drilling, as well as pipe jacking and rotary drilling. The roller drill bit has excellent rock breaking ability and adaptability to most rock formations. It is mainly used in directional well operations, carbonate layer drilling and unconventional well operations;

[0003] In the prior art, during the operation of the roller drill bit, the gaps between the crushing teeth are easily filled with a large amount of mud. Since the drilling fluid has a fixed spray angle, a large amount of mud cannot be removed in time, which seriously affects the crushing and excavation effect of the drill bit. Utility Model Content

[0004] The main purpose of the present application is to provide a drill bit for directional drilling, aiming to solve the defect of the prior art that mud blocks cannot be removed in time.

[0005] This application achieves the above objectives through the following technical solutions:

[0006] A drill bit for directional drilling, comprising a drill bit body;

[0007] A plurality of tooth palms, each of which is evenly arranged around the axis of the drill body; one end of each of the tooth palms is integrally connected to the drill body, and the other end thereof is rotatably connected to a cone; each of the cones is provided with a plurality of crushing teeth;

[0008] A connecting frame, the connecting frame is coaxially connected to the drill body; the connecting frame is provided with a plurality of scrapers for scraping off mud blocks, and each of the scrapers is adapted to the shape of each of the tooth palms;

[0009] A flushing module is arranged on the connecting frame, and an outlet end of the flushing module is respectively facing each of the tooth palms.

[0010] Optionally, the connecting frame includes a support tube and a support cover, and the support cover is a conical structure; a connecting hole is provided on the drill bit body, one end of the support tube is plug-connected to the connecting hole, and the other end thereof is connected to the support cover.

[0011] Optionally, the support tube is a hollow tube, and a connecting sleeve is integrally connected to the outer circumferential surface of the support tube, and the connecting sleeve is threadedly connected to the connecting hole; a limiting plate is also provided at one end of the connecting sleeve.

[0012] Optionally, a plug-in sleeve is provided on the inner wall of the support cover, one end of the support tube connected to the support cover is closed, the support tube is plug-connected to the plug-in sleeve, and a connecting screw is further provided between the support cover and the support tube.

[0013] Optionally, the outer edge of the support cover is also integrally provided with connecting spokes; the connecting spokes are connected to the drill bit body via connecting screws.

[0014] Optionally, the number of scrapers is the same as that of the gears, and each of the scrapers is arranged around the axis of the support cover; the bottom surface of each scraper is integrally connected to the support cover, and a plurality of avoidance grooves for the crushing teeth to pass through are arranged on the top.

[0015] Optional 8, the top of each scraper is in contact with the outer surface of the gear, and the top of the scraper is also provided with a crushing edge.

[0016] Optionally, a support bar is further provided in the middle of the scraper, and the support bar is connected to the support cover.

[0017] Optionally, the flushing module includes a plurality of flushing pipes and a plurality of nozzles, one end of each flushing pipe is closed, and the other end thereof is connected to the support pipe, and a water delivery cavity connected to the support pipe is provided on the drill bit body; along the axis of the flushing pipe, each nozzle is arranged in sequence on the outer surface of the flushing pipe; and the outlet end of each nozzle is respectively opposite to the gear.

[0018] Optionally, a plurality of branch pipes are provided on the support pipe, a plurality of adjustment grooves are provided on the support cover, each branch pipe corresponds to each adjustment groove, and an outlet end of each branch pipe passes through the corresponding adjustment groove and is connected to the flushing pipe.

[0019] Compared with the prior art, this application has the following beneficial effects:

[0020] The present application comprises a drill body, a plurality of tooth palms are evenly arranged around the axis of the drill body at one end of the drill body, one end of each tooth palm is connected to the drill body as a whole, and the other end is rotatably connected to a cone; a plurality of crushing teeth are arranged on each cone; a connecting frame coaxial with the drill body is also arranged on the drill body, a plurality of scrapers for scraping mud blocks are arranged on the connecting frame, and each scraper is adapted to the shape of each tooth palm; a flushing module is also arranged on the connecting frame, and the flushing module is respectively facing each tooth palm;

[0021] During use, the drill bit body and the cone will rotate normally. Since the crushing point of the cone is 180 degrees away from the cleaning point and the mud scraping point, the cone with mud blocks attached after crushing will first contact the scraper when it rotates to the bottom, and the larger mud blocks will be removed by the scraper; at the same time, the mud water in the drilling process will directly enter the flushing module through the drill bit body, and finally be sprayed out through the flushing module to realize the high-pressure flushing operation of the cone;

[0022] Compared with the prior art, the present invention realizes the cleaning of mud attached to the drill bit by combining scraping with a scraper and high-pressure water washing, which not only has a good cleaning effect but also has a high cleaning efficiency;

[0023] Secondly, the mud attached to the entire cone can be quickly cleaned within half a rotation cycle of the cone. On the one hand, it can ensure the timeliness of mud removal, and on the other hand, it ensures that the side of the cone used for drilling is always in a mud-free state, thereby ensuring the crushing effect and helping to improve drilling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A structural schematic diagram of a drill bit for directional drilling provided in Embodiment 1 of the present application;

[0025] Figure 2 An exploded view of a drill bit for directional drilling provided in Embodiment 1 of the present application;

[0026] Figure 3 A cross-sectional view of a drill bit for directional drilling provided in embodiment 1 of the present application;

[0027] Figure 4 is a schematic diagram of the structure of the support cover;

[0028] Figure numerals: 1-drill bit body, 2-tooth palm, 3-tooth wheel, 4-crushing tooth, 5-connecting frame, 6-scraper, 7-connecting hole, 8-connecting sleeve, 9-limiting plate, 10-plug sleeve, 11-connecting screw, 12-connecting screw, 13-avoidance groove, 14-crushing cutting edge, 15-support bar, 16-flushing pipe, 17-nozzle, 18-branch pipe, 19-adjusting groove, 501-support pipe, 502-support cover, 503-connecting spokes.

[0029] The purpose, features and advantages of this application will be further described in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0034] Implementation Method 1

[0035] Reference Figures 1 to 4 This embodiment is an optional embodiment of the present application, which discloses a drill bit for directional drilling, including a drill bit body 1, the drill bit body 1 is an overall cylindrical structure, and a connecting thread is arranged on the outer peripheral surface of one end; at the same time, a cavity for conveying drilling fluid is also arranged on the drill bit body 1;

[0036] The drill body 1 is closed at one end away from the connecting thread, and a plurality of tooth palms 2 are also arranged at the end, and the tooth palms 2 are evenly arranged around the axis of the drill body 1. One end of each tooth palm 2 is integrally connected to the drill body 1, and the other end is freely arranged. A cone 3 is rotatably connected to the free end through a pin shaft, and a plurality of crushing teeth 4 are arranged on the cone 3.

[0037] Furthermore, a connecting hole 7 is provided on the drill body 1, and the connecting hole 7 is coaxial with the drill body 1, that is, each of the tooth palms 2 is evenly arranged around the axis of the connecting hole 7;

[0038] The drill bit further includes a connecting frame 5, and the connecting frame 5 includes a support tube 501 and a support cover 502, wherein the support tube 501 is a hollow tube, and its cavity penetrates one end surface of the support tube 501, and the other end of the support tube 501 is closed;

[0039] A connecting sleeve 8 is integrally connected to the outer surface of the support tube 501, and the connecting sleeve 8 is threadedly connected to the connecting hole 7;

[0040] At the same time, a limiting plate 9 is integrally connected to one end of the connecting sleeve 8. When the connecting sleeve 8 is completely inserted into the connecting hole 7, the limiting plate 9 is tightly fitted with the end surface of the drill body 1 along the axial direction of the drill body 1.

[0041] After installation, the open end of the support tube 501 will be connected to the cavity in the drill bit body 1 for conveying drilling fluid, thereby achieving drainage of the drilling fluid;

[0042] The support cover 502 is a conical structure as a whole, and the drill bit further includes a plurality of scrapers 6, each of which is evenly arranged around the axis direction of the support cover 502. The number of the scrapers 6 is the same as the number of the tooth palms 2, and they correspond one to one, that is, one scraper 6 is used to clean one tooth wheel 3;

[0043] The bottom of each scraper 6 is connected to the support cover 502 by welding; of course, the scraper 6 can also be integrally connected to the support cover 502 by casting;

[0044] The top of each scraper 6 is inclined toward one side of the cone 3, and a plurality of avoidance grooves 13 are also provided on the top of each scraper 6. The number and size of the avoidance grooves 13 are determined according to the number and size of the groups of the crushing teeth 4. During the rotation of the cone 3, the crushing teeth 4 pass through the avoidance grooves, thereby avoiding interference and collision between the crushing teeth 4 and the scraper 6, and ensuring the stable operation of the equipment.

[0045] The scrapers 6 on both sides of each avoidance groove 13 are inserted into the gap between two adjacent groups of crushing teeth 4 and contact the outer surface of the cone 3; a section of the scraper 6 that fits the cone 3 is provided with a crushing edge 14, and the crushing edge 14 fits the outer surface of the cone 3;

[0046] The setting of the crushing edge 14 can quickly cut and split the mud, so as to quickly clean up the mud attached to the cone 3;

[0047] At the same time, a plurality of support bars 15 are also provided on the support cover 502. The number of the support bars 15 is the same as the number of the scrapers 6. The support bars 15 correspond to the scrapers 6 one by one. One end of each support bar 15 is connected to the support cover 502, and the other end thereof is connected to the middle area of ​​the scraper 6.

[0048] The support strips 15 can effectively improve the structural strength of the scraper 6 , thereby preventing the scraper 6 from being accidentally bent during the process of scraping stones, thereby increasing the service life of the scraper 6 .

[0049] Further, the drill bit also includes a flushing module, which includes a plurality of flushing pipes 16 and a plurality of nozzles 17, wherein the number of the flushing pipes 16 is the same as the number of the cones 3, and each flushing pipe 16 corresponds to each cone 3 one by one; each flushing pipe 16 is provided with 2-4 nozzles 17, and along the axial direction of the flushing pipe 16, each nozzle 17 is sequentially arranged on the outer surface of the flushing pipe 16; the outlet end of each nozzle 17 is respectively facing the cone 3;

[0050] The structures of the flushing tubes 16 are the same, and they are all open at one end and closed at the other end. Meanwhile, a plurality of branch tubes 18 are arranged on the support tube 501. The number of the branch tubes 18 is the same as that of the flushing tubes 16. The branch tubes 18 are evenly arranged around the axis of the support tube 501. One end of each branch tube 18 is connected to the open end of the flushing tube 16, and the other end is connected to the internal cavity of the support tube 501, so that each flushing tube 16 is connected to the infusion channel on the drill body 1 through the support tube 501 and the branch tubes 18.

[0051] Furthermore, a plurality of adjustment grooves 19 are provided on the support cover 502, each of the adjustment grooves 19 is a waist-shaped groove, each of the branch pipes 18 corresponds to each of the adjustment grooves 19, and the outlet end of the branch pipe 18 passes through the corresponding adjustment groove 19 and is connected to the flushing pipe 16;

[0052] Furthermore, the top of the support cover 502 is a flat-top structure; a coaxial plug-in sleeve 10 is provided on the inner wall of the support cover 502, and the closed end of the support tube 501 is inserted into the plug-in sleeve 10. At the same time, threaded holes are provided on the closed end of the support tube 501 and the top of the support cover 502. The two threaded holes are coaxial and are connected in series through a connecting screw 11, thereby realizing the connection between the support cover 502 and the support tube 501.

[0053] During the installation process, the support tube 501 is first connected to the drill body 1, and then the support tube 501 is plugged and connected to the support cover 502, and then the position of the scraper 6 is controlled by rotating and adjusting, and fixed by connecting the screw 11 after being adjusted into place;

[0054] The plug-in structure, the adjustment slot 19 and other structures give the whole device a certain degree of adjustability to meet different usage requirements; secondly, the above adjustment can also control the gap between the scraper 6 and the gear 3, thereby controlling the wear of the scraper 6.

[0055] Furthermore, the outer edge of the support cover 502 is also integrally provided with connecting spokes 503; the connecting spokes 503 are connected to the drill body 1 via connecting screws 12;

[0056] The connection stability between the support cover 502 and the drill body 1 can be further improved by connecting the spokes 503 .

[0057] When in use, the drill bit body 1 and the cone 3 will rotate normally. Since the crushing point of the cone 3 is 180 degrees away from the cleaning point and the mud scraping point, the cone 3 with mud blocks attached after crushing will first contact the scraper 6 when it rotates to the bottom, and the larger mud blocks will be removed by the scraper 6; at the same time, the mud water in the drilling process will directly enter the flushing module through the drill bit body 1, and finally be sprayed out through the flushing module to realize the high-pressure flushing operation of the cone 3;

[0058] Compared with the prior art, the present invention realizes the cleaning of mud attached to the drill bit by combining scraping with a scraper and high-pressure water washing, which not only has a good cleaning effect but also has a high cleaning efficiency;

[0059] Secondly, the mud attached to the entire cone can be quickly cleaned within half a rotation cycle of the cone. On the one hand, it can ensure the timeliness of mud removal, and on the other hand, it ensures that the side of the cone used for drilling is always in a mud-free state, thereby ensuring the crushing effect and helping to improve drilling efficiency.

[0060] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A drill bit for directional drilling, characterized in that: It comprises a drill bit body (1); A plurality of tooth palms (2), each of the tooth palms (2) being evenly arranged around the axis of the drill bit body (1); one end of each of the tooth palms (2) being integrally connected to the drill bit body (1), and the other end thereof being rotatably connected to a cone (3); each of the cones (3) being provided with a plurality of crushing teeth (4); A connecting frame (5), the connecting frame (5) being coaxially connected to the drill head body (1); a plurality of scrapers (6) for scraping off mud blocks are arranged on the connecting frame (5), and each of the scrapers (6) is adapted to the shape of each of the tooth palms (2); A flushing module is arranged on the connecting frame (5), and the outlet end of the flushing module faces each of the tooth palms (2).

2. A drill bit for directional drilling according to claim 1, characterized in that: The connecting frame (5) comprises a supporting tube (501) and a supporting cover (502), wherein the supporting cover (502) is of a conical structure; a connecting hole (7) is provided on the drill bit body (1), one end of the supporting tube (501) is plug-connected to the connecting hole (7), and the other end thereof is connected to the supporting cover (502).

3. A drill bit for directional drilling according to claim 2, characterized in that: The support tube (501) is a hollow tube, and a connecting sleeve (8) is integrally connected to the outer circumferential surface of the support tube (501), and the connecting sleeve (8) is threadedly connected to the connecting hole (7); a limiting plate (9) is also provided at one end of the connecting sleeve (8).

4. A drill bit for directional drilling according to claim 2, characterized in that: A plug-in sleeve (10) is provided on the inner wall of the support cover (502); one end of the support tube (501) connected to the support cover (502) is closed; the support tube (501) is plug-connected to the plug-in sleeve (10); and a connecting screw (11) is further provided between the support cover (502) and the support tube (501).

5. A drill bit for directional drilling according to claim 2 or 4, characterized in that: The outer edge of the support cover (502) is also integrally provided with connecting spokes (503); the connecting spokes (503) are connected to the drill bit body (1) via connecting screws (12).

6. A drill bit for directional drilling according to claim 2, characterized in that: The number of the scrapers (6) is the same as that of the gears (3), and each of the scrapers (6) is arranged around the axis of the support cover (502); the bottom surface of each scraper (6) is integrally connected to the support cover (502), and a plurality of avoidance grooves (13) for the crushing teeth (4) to pass through are arranged on the top thereof.

7. A drill bit for directional drilling according to claim 6, characterized in that: The top of each scraper (6) is in contact with the outer surface of the cone (3), and a crushing edge (14) is also provided on the top of the scraper (6).

8. A drill bit for directional drilling according to claim 6 or 7, characterized in that: A support bar (15) is also provided in the middle of the scraper (6), and the support bar (15) is connected to the support cover (502).

9. A drill bit for directional drilling according to claim 2, characterized in that: The flushing module comprises a plurality of flushing pipes (16) and a plurality of nozzles (17); one end of each flushing pipe (16) is closed, and the other end thereof is connected to the support pipe (501); a water delivery cavity connected to the support pipe (501) is provided on the drill bit body (1); along the axis of the flushing pipe (16), each nozzle (17) is sequentially arranged on the outer surface of the flushing pipe (16); and the outlet end of each nozzle (17) is respectively opposite to the gear (3).

10. A drill bit for directional drilling according to claim 9, characterized in that: The support pipe (501) is provided with a plurality of branch pipes (18), the support cover (502) is provided with a plurality of adjustment grooves (19), each branch pipe (18) corresponds to each adjustment groove (19), and the outlet end of the branch pipe (18) passes through the corresponding adjustment groove (19) and is connected to the flushing pipe (16).

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