TSP drill bit

Abstract

The utility model belongs to the technical field of drilling tools, and particularly relates to a TSP drill bit. The TSP drill bit comprises a main body and a cutting element arranged on the main body, and the cutting element is fixed on the main body through a screw. The size of the cutting element can be increased, protection on the drill bit is enhanced, and a drilling ruler is added.

Description

Technical Field

[0001] The utility model belongs to the technical field of drilling tools, and in particular relates to a TSP drill bit. Background Art

[0002] TSP is thermally stable polycrystalline diamond. Thermally stable polycrystalline diamond (TSP) is a thermally stable polycrystalline diamond product produced using ultra-high pressure and high temperature technology. The binder of thermally stable polycrystalline diamond is chemically inert and has a thermal expansion coefficient similar to that of diamond. The thermal stability of thermally stable polycrystalline diamond is up to 1200 degrees Celsius. It can be manufactured into various sizes and shapes (cubes, cylinders, rectangles, triangles, etc.).

[0003] At present, TSP cutting elements are all set to small size and embedded on the blade of the drill bit. The mechanical drilling speed of the drill bit with small-sized cutting elements is slow, and the small-sized TSP cutting elements are not conducive to protecting the drill body, which can easily cause damage to the drill body and cause particle loss, so the drill bit has less footage.

[0004] In addition, in the current drilling operation process, there is a demand for casing drilling. Casing drilling refers to the drilling technology of using casing instead of drill pipe to apply torque and drilling pressure to the drill bit, driving the drill bit to rotate and drill, and directly cementing the well after drilling to the designed well depth.

[0005] In the existing casing drilling operation, the entire drilling process no longer uses drill rods, drill collars, etc. During the operation, wire ropes are used to cast and fish, and the drill bit is replaced or pulled out in the casing. The casing drill bit itself can rotate with the casing, and the pressure and rotational force exerted by the cooperation of the casing and other structures can crush the contacted strata or rocks to achieve the drilling effect.

[0006] However, this operation method requires a lot of auxiliary time to cast and retrieve the drill bit, and the operation is more complicated, which is not conducive to increasing speed and efficiency. Utility Model Content

[0007] In view of the above-mentioned technical problems, the present invention aims to provide a TSP drill bit, which can solve at least one of the above-mentioned technical problems.

[0008] According to the utility model, a TSP drill bit is provided, comprising a main body and a cutting element arranged on the main body, wherein the cutting element is fixed to the main body by screws.

[0009] In a specific embodiment, the cutting element is configured in a cylindrical shape, and a through hole for passing a screw is provided on the cutting element along the direction of the central axis.

[0010] In a specific embodiment, the through hole is configured as a countersunk hole.

[0011] In a specific embodiment, a plurality of protrusions are evenly arranged on the upper end surface of the cutting element along the circumferential direction.

[0012] In a specific embodiment, the cutting element is connected to the screw and the main body by gluing.

[0013] In a specific embodiment, the main body includes:

[0014] sleeve; and

[0015] The core body is made of drillable material and is fixedly arranged at the end of the sleeve. The cutting element is arranged on the core body.

[0016] In a specific embodiment, the core body includes a plurality of first blades arranged at intervals along the circumferential direction, and a first flow channel is formed between any two adjacent first blades.

[0017] In a specific embodiment, the cutting element includes cutting teeth and gauge teeth, and a plurality of first cutting teeth and first gauge teeth are arranged on the first blade.

[0018] In a specific embodiment, the core is connected to the sleeve via a torque transmission mechanism.

[0019] In a specific embodiment, a core hole is coaxially arranged at one end of the core body close to the sleeve, and a nozzle is arranged in the core body. Both ends of the nozzle are respectively connected to the core hole and the first flow channel, and the central axis of the nozzle is inclined relative to the central axis of the core body.

[0020] Compared with the prior art, the advantages of the present application are as follows.

[0021] The TSP drill bit provided by the utility model comprises a main body and a cutting element made of TSP material, wherein the cutting element is fixed to the main body by screw connection. Through this arrangement, the size of the cutting element can be increased, so that the main body can be fully protected, and the main body part is prevented from directly contacting the formation during the drilling process of the drill bit, thereby avoiding damage to the main body, preventing the cutting element from falling off the main body, and increasing the drilling footage of the drill bit.

[0022] The TSP drill bit provided by the utility model comprises a sleeve and a core body arranged at the end of the sleeve, wherein the core body is made of a drillable material. Under this arrangement, it is not necessary to use a wire rope to cast and fish the drill bit, and the drill bit can be directly drilled out by drilling out, thereby saving a lot of time and accelerating drilling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The utility model will be described below with reference to the accompanying drawings.

[0024] Figure 1 A schematic diagram showing a first embodiment of a cutting element according to the present invention;

[0025] Figure 2 Shows Figure 1 A schematic diagram of the three-dimensional structure of the cutting element;

[0026] Figure 3 A schematic diagram showing a second embodiment of a cutting element according to the present invention;

[0027] Figure 4 A schematic diagram showing a first embodiment of a TSP drill bit according to the present utility model;

[0028] Figure 5 A schematic diagram of a second embodiment of a TSP drill bit according to the utility model is shown.

[0029] In the figure: 1, sleeve; 2, core; 3, second blade; 4, first blade; 5, second flow channel; 6, first flow channel; 7, first cutting tooth; 8, second cutting tooth; 9, first gauge tooth; 10, second gauge tooth; 11, nozzle; 12, torque transmission mechanism; 13, core hole; 14, through hole; 15, joint; 16, fixing piece; 100, TSP drill bit;

[0030] 20. Main body; 30. Cutting element; 31. Through hole; 311. First hole section; 312. Second hole section; 313. Third hole section; 32. Protrusion.

[0031] In the present application, all drawings are schematic drawings, which are only used to illustrate the principles of the present utility model and are not drawn according to the actual scale. DETAILED DESCRIPTION

[0032] The utility model is introduced below by means of the accompanying drawings.

[0033] It should be noted that the directional terms or qualifiers "upper", "lower", etc. used in this application are all with reference to the drawings to which they are referred. They are not used to limit the absolute positions of the components involved, but can be changed according to specific circumstances.

[0034] Embodiment 1:

[0035] Figure 4 The structure of the TSP drill bit 100 according to the present invention is shown. Figure 4 As shown, the TSP drill bit 100 includes a body 20 and a cutting element 30 fixedly disposed on the body 20 .

[0036] Figure 1 The structure of the cutting element 30 according to the present invention is shown. Figure 1As shown, in this embodiment, the cutting element 30 is constructed to be roughly cylindrical, and a through hole 31 is provided along the central axis of the cutting element 30, and the through hole 31 is used to pass a screw. Correspondingly, a threaded hole for connecting with the screw is provided on the main body 20.

[0037] In a preferred embodiment, a positioning step for positioning the cutting element 30 is also provided on the main body 20. When the cutting element 30 is assembled to the main body 20, the cutting element 30 is placed on the positioning step of the main body 20, and then a screw is inserted into the cutting element 30, and finally the screw is screwed into the threaded hole of the main body 20, thereby fixing the cutting element 30 on the main body 20.

[0038] Through the arrangement of the utility model, a large-sized TSP cutting element 30 can be fixed on the main body 20, and the single-layer busbar covering arrangement can prevent the main body 20 from directly contacting the formation during drilling. Compared with the prior art, the TSP cutting element in the prior art is smaller in size and cannot provide good protection for the main body 20, which affects the footage. In order to ensure the footage, a multi-layer busbar covering arrangement is required, which increases the probability of the cutting element falling off from the main body 20.

[0039] In a preferred embodiment, Figure 1 As shown, the through hole 31 is configured as a countersunk hole, that is, the hole diameter of the upper end of the through hole 31 is larger than the hole diameter of the lower end. In this configuration, the hole at the upper end of the through hole 31 can be used to accommodate the head of the screw, so that the screw is completely located inside the cutting element 30, which can prevent the screw from directly contacting the formation during the drilling process of the drill bit, thereby preventing the cutting element 30 from falling off from the main body 20 due to damage to the screw.

[0040] According to the utility model, if Figure 3 As shown, the through hole 31 includes a first hole section 311, a second hole section 312, and a third hole section 313 which are coaxially arranged from top to bottom, wherein the third hole section 313 is used for the threaded portion of the screw to pass through, the second hole section 312 is used for axially abutting against the head of the screw, and the first hole section 311 is used to ensure that the screw can be completely located inside the cutting element 30. In a specific embodiment, the second hole section 312 is set to a cone shape that matches the shape of the head of the screw, and the first hole section 311 and the third hole section 313 are respectively set to cylindrical shapes that are consistent with the upper and lower end sizes of the second hole section 312.

[0041] In a preferred embodiment, Figure 2 As shown, a plurality of protrusions 32 are provided along the circumferential direction on the cutting surface of the cutting element 30. The protrusions 32 can enhance the cutting ability of the cutting element 30 on the formation, and also can enhance the protection of the screw and the main body 20.

[0042] In a specific embodiment, the protrusion 32 can be configured in various shapes such as a ridge shape, a triangular prism shape, a quadrangular prism shape, etc.

[0043] Furthermore, a chamfer is provided on the lower surface of the cutting element 30 .

[0044] In a preferred embodiment, the cutting element 30 is connected to the screw and the main body 20 by gluing. That is, before the cutting element 30 is assembled to the main body 20, glue is applied to the through hole 31 of the cutting element 30, the thread of the screw, and the threaded hole of the main body 20, and then the cutting element 30 is installed to the main body 20 by the screw. This arrangement can make the connection between the cutting element 30 and the main body 20 more stable.

[0045] Embodiment 2:

[0046] In a specific embodiment, Figure 4 As shown, the main body 20 includes a sleeve 1 and a core 2, and the core 2 is coaxially fixedly arranged at the end of the sleeve 1. According to the utility model, the core 2 is made of a drillable material. With this arrangement, there is no need to use a wire rope to fish the drill bit. The core 2 can be directly drilled out by drilling out to make the oil and gas well unblocked and carry out the next opening operation.

[0047] In a specific embodiment, the core 2 is made of drillable aluminum alloy or copper alloy material. It is easy to understand that the drillable aluminum alloy or copper alloy material is a prior art and is well known to those skilled in the art, and will not be described in detail here.

[0048] In a preferred embodiment, the material strength of the sleeve 1 is greater than the material strength of the core 2. Specifically, the sleeve 1 is made of alloy steel materials such as 40CrMnMoA and 42CrMo. During the drilling process, the outer diameter of the drilling tool is smaller than the inner diameter of the sleeve 1, and the drilling tool can be inserted into the sleeve 1 to directly drill the core 2. The material used for the sleeve 1 in this embodiment makes the sleeve 1 high in strength, thereby improving the overall strength of the TSP drill bit 100 of the utility model.

[0049] In a specific embodiment, Figure 4 As shown, the sleeve 1 includes a joint 15, a through hole portion 14 and a torque transmission mechanism 12, wherein the inner diameters of the joint 15 and the torque transmission mechanism 12 are both larger than the inner diameter of the through hole portion 14. The core 2 is adapted to the torque transmission mechanism 12, and the lower end of the core 2 extends into the interior of the torque transmission mechanism 12 until the lower end of the core 2 abuts against the upper end of the through hole portion 14.

[0050] In this embodiment, the torque transmission mechanism 12 is a thread, that is, an external thread is provided on the outer wall of the core body 2, and an internal thread is provided on the inner wall of the sleeve 1, and the core body 2 and the sleeve 1 are fixed to each other by threaded connection.

[0051] According to the present invention, the core 2 includes a plurality of first blades 4 arranged at intervals along the circumferential direction, and each first blade 4 extends from the axial end of the overall structure of the core 2 to the side. A first flow channel 6 is provided between any two adjacent first blades 4 .

[0052] In a preferred embodiment, a ceramic glue is cold-coated on the surface of the first blade 4 for strengthening. The ceramic glue includes ceramic powder and resin glue, which are uniformly mixed to form ceramic glue. The ceramic powder can be silicon carbide, silicon nitride, tungsten carbide, etc.

[0053] A plurality of cutting elements 30 are fixed to the first blade 4 by screws. In this embodiment, the cutting elements 30 are specifically the first cutting teeth 7 and the first gauge teeth 9, that is, the specific structures of the first cutting teeth 7 and the first gauge teeth 9 are the cutting elements 30 in the first embodiment.

[0054] A plurality of first cutting teeth 7 and first gauge teeth 9 are arranged on the first blade wing 4. The first cutting teeth 7 are arranged on the first blade wing 4 corresponding to the axial end of the core body 2, and the first gauge teeth 9 are arranged on the first blade wing 4 corresponding to the side of the core body 2.

[0055] The first cutting teeth 7 and the first gauge teeth 9 cover the generatrix of the first blade wing 4, that is, the first cutting teeth 7 and the first gauge teeth 9 are arranged in sequence along the generatrix of the first blade wing 4, and the number of covering layers of the first cutting teeth 7 and the first gauge teeth 9 on each first blade wing 4 is greater than or equal to 1 and less than or equal to 10 layers.

[0056] In a preferred embodiment, the top surface and side surfaces of the first blade 4 are sprayed with superhard material by plasma spraying, laser spraying or high velocity oxygen fuel (HVOF) spraying, and are strengthened by oxidation or the like.

[0057] In a preferred embodiment, the top surface and side surfaces of the first blade wing 4 are reinforced by applying ceramic glue or the like.

[0058] In a specific embodiment, a center hole 13 is coaxially arranged at one end of the core body 2 close to the sleeve 1, and a nozzle 11 is arranged inside the core body 2. The two ends of the nozzle 11 are respectively connected to the center hole 13 and the first flow channel 6, and the central axis of the nozzle 11 is inclined relative to the central axis of the core body 2.

[0059] Furthermore, the nozzle 11 is made of drillable copper alloy, ceramic, aluminum alloy, or a combination of copper alloy and ceramic.

[0060] Furthermore, the nozzle 11 is arranged to cover the bottom hole generatrix. In other words, the nozzle 11 and the central axis of the core body 2 have overlapping parts.

[0061] In this embodiment, if Figure 4 As shown, the sleeve 1 includes a plurality of second blades 3 uniformly distributed at intervals along the circumference, and the top of the second blade 3 is set to be arc-shaped, that is, the diameter of the top area of ​​the second blade 3 gradually decreases from bottom to top. A second flow channel 5 is set between two adjacent second blades 3.

[0062] In a preferred embodiment, tungsten carbide is built-up on the surface of the second blade wing 3, thereby strengthening the second blade wing 3.

[0063] A plurality of second cutting teeth 8 and second gauge teeth 10 are arranged on the second blade wing 3, and the specific structure of the second cutting teeth 8 and the second gauge teeth 10 is the cutting element 30 in the first embodiment. The second cutting teeth 8 are arranged in the top arc region of the second blade wing 3. The second gauge teeth 10 are arranged on the side of the second blade wing 3 and are located below the arc region of the second blade wing 3.

[0064] The second cutting teeth 8 and the second gauge teeth 10 cover the generatrix of the second blade wing 3. In other words, the second cutting teeth 8 and the second gauge teeth 10 are both distributed along the generatrix of the second blade wing 3.

[0065] Furthermore, the top surface and side surfaces of the second blade wing 3 are strengthened by surfacing, plasma spraying, laser spraying, and the like.

[0066] In this embodiment, the first cutting teeth 7, the second cutting teeth 8, the first gauge teeth 9, and the second gauge teeth 10 are made of any superhard material such as thermally stable polycrystalline diamond (TSP), PDC composite sheet, cemented carbide, ceramic, cubic boron nitride, etc.

[0067] In a specific embodiment, the outer diameter of the first gauge teeth 9 on the first blade wing 4 is smaller than the outer diameter of the second gauge teeth 10 on the second blade wing 3 .

[0068] In this embodiment, the working principle of the TSP drill bit 100 is as follows. The joint 15 is connected to the casing (not shown in the figure) of the casing drilling process. During the drilling process, the drilling fluid flows into the annulus along the casing through the through-hole portion 14, the core hole 13, the nozzle 11, the first flow channel 6, and the second flow channel 5 in sequence. The drilling pressure of the casing is transmitted to the core body 2 through the sleeve 1. The first cutting teeth 7 on the core body 2 and the drilling fluid of the nozzle 11 are combined to break the formation to form a small wellbore at the center of the bottom of the well, release the formation pressure at the bottom of the well, and enhance the drillability of the formation. Then the second cutting teeth 8 on the sleeve 1 are combined with the return drilling fluid to break the rock near the well wall to form a wellbore of the designed diameter. The mechanical and hydraulic combined rock breaking is conducive to improving the mechanical drilling speed. After the TSP drill bit 100 of the utility model drills to the designed well depth, there is no need to salvage the drill bit, and cement is directly injected to cement the well, which simplifies the cementing procedure and saves the completion auxiliary time. When the next process is carried out, the drill bit is directly lowered to drill out the TSP drill bit 100 of the utility model, and then the new well section is continuously drilled, which greatly simplifies the casing drilling process, improves the downhole safety, and saves the drilling cost.

[0069] Embodiment three:

[0070] Figure 5 FIG. 2 shows the structure of a second embodiment of a TSP drill bit 100 according to the present invention. Figure 5 As shown, the TSP drill bit 100 includes a sleeve 1 and a core 2, and the core 2 is coaxially fixedly arranged at the end of the sleeve 1. According to the utility model, the core 2 is made of a drillable material. With this arrangement, there is no need to use a wire rope to fish the drill bit. The core 2 can be directly drilled out by drilling out, so that the oil and gas well can be unblocked and the next drilling operation can be carried out.

[0071] In a specific embodiment, the core 2 is made of drillable aluminum alloy or copper alloy material. It is easy to understand that the drillable aluminum alloy or copper alloy material is a prior art, and its specific composition is not the technical key point of the utility model, and will not be repeated here.

[0072] In a preferred embodiment, the sleeve 1 is made of alloy steel materials such as 40CrMnMoA, 42CrMo, etc. During the drilling process, the outer diameter of the drilling tool is smaller than the inner diameter of the sleeve 1, and the drilling tool can be inserted into the sleeve 1 to directly drill the core 2. The material used for the sleeve 1 in this embodiment makes the sleeve 1 high in strength, thereby improving the overall strength of the TSP drill bit 100 of the utility model.

[0073] In a specific embodiment, Figure 4As shown, the sleeve 1 includes a joint 15, a through hole portion 14 and a torque transmission mechanism 12, wherein the inner diameters of the joint 15 and the torque transmission mechanism 12 are both larger than the inner diameter of the through hole portion 14. The core 2 is adapted to the torque transmission mechanism 12, and the lower end of the core 2 extends into the interior of the torque transmission mechanism 12 until the lower end of the core 2 abuts against the upper end of the through hole portion 14.

[0074] In this embodiment, the torque transmission mechanism 12 includes a fixing member 16. Specifically, the core 2 is inserted or screwed into the sleeve 1 along the axial direction until the lower end of the core 2 abuts against the upper end of the through hole portion 14, and then the core 2 and the sleeve 1 are fixed by the radially arranged fixing member 16. Further, the fixing member 16 can be a screw or a pin.

[0075] In a preferred embodiment, the core 2 is axially inserted into the sleeve 1 by key connection, spline connection or polygonal prism connection. Specifically, mutually matching keys and keyways, or mutually matching splines and splineways, or mutually matching polygons are provided between the outer wall of the core 2 and the inner wall of the sleeve 1. After the core 2 is inserted into place, the core 2 is fixed to the sleeve 1 in the radial direction by screws or pins.

[0076] According to the utility model, the core 2 includes a plurality of first blades 4 that are evenly arranged at intervals along the circumference, and each first blade 4 extends from the axial end of the overall structure of the core 2 to the side. A first flow channel 6 is provided between any two adjacent first blades 4 .

[0077] A plurality of first cutting teeth 7 and first gauge teeth 9 are arranged on the first blade wing 4. The first cutting teeth 7 are arranged on the first blade wing 4 corresponding to the axial end of the core body 2, and the first gauge teeth 9 are arranged on the first blade wing 4 corresponding to the side of the core body 2.

[0078] In a preferred embodiment, the top surface and side surfaces of the first blade 4 are sprayed with superhard material by plasma spraying, laser spraying or high velocity oxygen fuel (HVOF) spraying, and are strengthened by oxidation or the like.

[0079] In a preferred embodiment, the top surface and side surfaces of the first blade wing 4 are reinforced by applying ceramic glue or the like.

[0080] In a specific embodiment, a center hole 13 is coaxially arranged at one end of the core body 2 close to the sleeve 1, and a nozzle 11 is arranged inside the core body 2. The two ends of the nozzle 11 are respectively connected to the center hole 13 and the first flow channel 6, and the central axis of the nozzle 11 is inclined relative to the central axis of the core body 2.

[0081] Furthermore, the nozzle 11 is made of drillable copper alloy, ceramic, aluminum alloy, or a combination of copper alloy and ceramic.

[0082] Furthermore, the nozzle 11 is arranged to cover the bottom hole generatrix. In other words, the nozzle 11 and the central axis of the core body 2 have overlapping parts.

[0083] In this embodiment, if Figure 4 As shown, the sleeve 1 includes a plurality of second blades 3 uniformly distributed at intervals along the circumference, and the top of the second blade 3 is set to be arc-shaped, that is, the diameter of the top area of ​​the second blade 3 gradually decreases from bottom to top. A second flow channel 5 is set between two adjacent second blades 3.

[0084] A plurality of second cutting teeth 8 and second gauge teeth 10 are arranged on the second blade wing 3. The second cutting teeth 8 are arranged on the top arc region of the second blade wing 3. The second gauge teeth 10 are arranged on the side of the second blade wing 3 and are located below the arc region of the second blade wing 3.

[0085] Furthermore, the top surface and side surfaces of the second blade wing 3 are strengthened by surfacing, plasma spraying, laser spraying, and the like.

[0086] In this embodiment, the first cutting teeth 7, the second cutting teeth 8, the first gauge teeth 9, and the second gauge teeth 10 are made of any superhard material such as thermally stable polycrystalline diamond (TSP), PDC composite sheet, cemented carbide, ceramic, cubic boron nitride, etc.

[0087] In a specific embodiment, the outer diameter of the first gauge teeth 9 on the first blade wing 4 is smaller than the outer diameter of the second gauge teeth 10 on the second blade wing 3 .

[0088] In this embodiment, the working principle of the TSP drill bit 100 is as follows. The joint 15 is connected to the casing (not shown in the figure) of the casing drilling process. During the drilling process, the drilling fluid flows into the annulus along the casing through the through-hole portion 14, the core hole 13, the nozzle 11, the first flow channel 6, and the second flow channel 5 in sequence. The drilling pressure of the casing is transmitted to the core body 2 through the sleeve 1. The first cutting teeth 7 on the core body 2 and the drilling fluid of the nozzle 11 are combined to break the formation to form a small wellbore at the center of the bottom of the well, release the formation pressure at the bottom of the well, and enhance the drillability of the formation. Then the second cutting teeth 8 on the sleeve 1 are combined with the return drilling fluid to break the rock near the well wall to form a wellbore of the designed diameter. The mechanical and hydraulic combined rock breaking is conducive to improving the mechanical drilling speed. After the TSP drill bit 100 of the utility model drills to the designed well depth, there is no need to salvage the drill bit, and cement is directly injected to cement the well, which simplifies the cementing procedure and saves the completion auxiliary time. When the next process is carried out, the drill bit is directly lowered to drill out the TSP drill bit 100 of the utility model, and then the new well section is continuously drilled, which greatly simplifies the casing drilling process, improves the downhole safety, and saves the drilling cost.

[0089] In the description of the present utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0090] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it 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 it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0091] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0092] Finally, it should be noted that the above is only a preferred embodiment of the utility model and does not constitute any limitation to the utility model. Although the utility model is described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A TSP drill bit, characterized in that: The invention comprises a main body (20) and a cutting element (30) arranged on the main body (20), wherein the cutting element (30) is fixed to the main body (20) by means of screws, a through hole (31) for passing the screw is arranged on the cutting element (30), and the cutting element (30) is connected to the screw and the main body (20) by means of gluing.

2. The TSP drill bit according to claim 1, characterized in that: The cutting element (30) is configured in a cylindrical shape, and a through hole (31) for inserting a screw is arranged on the cutting element (30) along the direction of the central axis.

3. The TSP drill bit according to claim 2, characterized in that: The through hole is configured as a countersunk hole.

4. The TSP drill bit according to claim 2, characterized in that: A plurality of protrusions (32) are evenly arranged on the upper end surface of the cutting element (30) along the circumferential direction.

5. The TSP drill bit according to any one of claims 1 to 4, characterized in that: The main body (20) comprises: a sleeve (1); and The core body (2) is made of a drillable material and is fixedly arranged at the end of the sleeve (1); the cutting element (30) is arranged on the core body (2).

6. The TSP drill bit according to claim 5, characterized in that: The core (2) comprises a plurality of first blades (4) arranged at intervals along the circumferential direction, and a first flow channel (6) is provided between any two adjacent first blades (4).

7. The TSP drill bit according to claim 6, characterized in that: The cutting element (30) comprises cutting teeth and gauge teeth, and a plurality of first cutting teeth (7) and first gauge teeth (9) are arranged on the first blade wing (4).

8. The TSP drill bit according to claim 5, characterized in that: The core (2) is connected to the sleeve (1) via a torque transmission mechanism (12).

9. The TSP drill bit according to claim 6, characterized in that: A core hole (13) is coaxially arranged at one end of the core body (2) close to the sleeve (1), and a nozzle (11) is arranged inside the core body (2). Two ends of the nozzle (11) are respectively connected to the core hole (13) and the first flow channel (6), and the central axis of the nozzle (11) is inclined relative to the central axis of the core body (2).

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