Rotary spherical cutting tooth

Abstract

The invention belongs to the technical field of drilling tools, and particularly relates to a rotary spherical cutting tooth. Each rotary spherical cutting tooth comprises two cutting elements which are rotationally arranged on the two sides of the corresponding blade and rotate synchronously. In the drilling process of the drill bit, the cutting elements can automatically rotate, rotary stratum cutting is achieved, the stratum is prevented from always abrading the same cutting face of the cutting elements, and the service life of the cutting teeth is prolonged. Due to the design of the double-end cutting elements, the assembly machining mode of the cutting elements and the blades is optimized, the machining cost is reduced, and finally the drilling cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of drilling tools, and specifically relates to a rotary spherical cutting tooth. Background Art

[0002] Existing cutting teeth are all single-headed cutting teeth, with a fast wear rate, a short effective drilling time period of the drill bit, and a high replacement frequency. The single-headed cutting tooth is difficult to realize the function of rotating and cutting the formation, resulting in uneven wear degree of the cutting surface, short drill bit life. As the requirements for the wear resistance of drill bits in deep wells and hard formations are continuously increasing, the cost of a single round trip of tripping gradually increases.

[0003] Currently, the ONYX polycrystalline diamond compact cutting tooth can achieve 360-degree rotary cutting, but the processing difficulty is high. It is a single-headed cutting tooth, and the assembly cost is high.

[0004] In order to solve the problems such as fast wear rate of the drill bit cutting teeth, uneven wear degree of the cutting teeth, and low effective footage of the drill teeth during the drilling process in deep and hard formations, improve the drilling efficiency in deep and hard formations, and reduce the drilling cost, the present invention proposes a double-headed rotatable spherical cutting tooth, which can effectively extend the life of the drill bit, reduce the number of drill bit replacements, and has great potential in reducing the drilling cost. Summary of the Invention

[0005] In view of the above technical problems, the present invention aims to provide a rotary spherical cutting tooth, which can extend the life of the drill bit, reduce the number of drill bit replacements, and reduce the drilling cost.

[0006] According to the present invention, there is provided a rotary spherical cutting tooth, including two synchronously rotating cutting elements rotatably arranged on both sides of the cutter blade, and the cutting surface of the cutting element is set as a spherical surface.

[0007] In a specific embodiment, a connecting column is rotatably arranged on the cutter blade, and the two cutting elements are respectively arranged on both sides of the connecting column.

[0008] In a specific embodiment, the diameter of the cutting element is larger than the diameter of the connecting column.

[0009] In a specific embodiment, the distance between the two cutting elements is greater than the thickness of the cutter blade.

[0010] In a specific embodiment, the cutting element includes a cutting tooth head and a PDC grinding disc coaxially arranged at the end of the connecting column.

[0011] In a specific embodiment, the cutting tooth head is fixedly connected to the connecting column, and the PDC grinding disc is arranged at one end of the cutting tooth head away from the connecting column.

[0012] In a specific embodiment, the cutting tooth head is configured in a cylindrical shape, and the PDC grinding disc is configured in a spherical shape.

[0013] In a specific embodiment, the surface of the cutting element close to the blade is configured to be parallel to the blade.

[0014] In a specific embodiment, the projection surface of the blade is set as a rectangle, and the surface of the cutting element close to the blade is set as a plane.

[0015] In a specific embodiment, an installation hole for rotatably connecting with the connecting column is provided on the blade. The blade includes a fixing portion fixed on the drill bit and a connecting portion fixedly arranged on the fixing portion. The fixing portion and the connecting portion jointly form the installation hole. After radially assembling the connecting column into the installation hole, the connecting portion and the fixing portion are fixed, thereby closing the installation hole.

[0016] Compared with the prior art, the advantages of the present application are as follows.

[0017] The present invention includes two cutting elements arranged on the side of the blade. During the drilling process of the drill bit, the cutting elements can automatically rotate to realize rotary cutting of the formation, prevent the same cutting surface of the cutting elements from being always worn by the formation, and extend the service life of the cutting teeth.

[0018] Meanwhile, the design of the double-headed cutting element optimizes the assembly and processing mode of the cutting element and the blade, reduces the processing cost, and ultimately reduces the drilling cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be described below with reference to the accompanying drawings.

[0020] Figure 1 Shows a schematic diagram of an embodiment in which the rotary spherical cutting teeth according to the present invention are installed on the blade;

[0021] Figure 2 Shows a schematic diagram of an embodiment of the rotary spherical cutting teeth according to the present invention;

[0022] Figure 3 Shows Figure 2 a top view schematic diagram of;

[0023] Figure 4 Shows a schematic diagram of the rotary spherical cutting teeth according to the present invention when cutting the formation;

[0024] Figure 5 Shows a schematic diagram of an embodiment in which the rotary spherical cutting teeth according to the present invention are installed on an irregular blade.

[0025] In the figure: 1, PDC grinding disc; 2, cutting tooth head; 3, connecting column; 4, assembly surface; 5, blade; 51, fixing part; 52, connecting part; 53, mounting hole; 6, cutting element; 7, first formation to be cut; 8, second formation to be cut; 100, rotary spherical cutting tooth.

[0026] In this application, all the attached drawings are schematic drawings, only used to illustrate the principle of the present invention and not drawn to actual scale. Detailed implementation manners

[0027] The present invention will be introduced below with reference to the attached drawings.

[0028] It should be noted that the directional terms or qualifiers such as "upper", "lower", "front", "rear", "left", "right", etc. used in this application are all with reference to the attached drawings. They do not limit the absolute positions of the components involved, but can vary according to specific situations.

[0029] Figure 1 Shows the structure of the rotary spherical cutting tooth 100 according to the present invention. As Figure 1 shown, the rotary spherical cutting tooth 100 includes two synchronously rotating cutting elements 6 rotatably arranged on both sides of the blade 5. When cutting the formation, as Figure 4 shown, the cutting elements 6 on both sides of the rotary spherical cutting tooth 100 on the blade 5 come into contact with the formation and cut the formation. During the process of cutting the formation, the positions of the formation cut by the two cutting elements 6 are different, and the force points and magnitudes are also different, causing the rotary spherical cutting tooth 100 to generate a self-rotation movement during the cutting process, which can rotate and cut 360 degrees, can make full use of the circumferential direction of the cutting element 6, effectively improve the use efficiency of the cutting element 6, and extend the service lives of the cutting element 6 and the drill bit.

[0030] In a specific embodiment, a connecting column 3 is rotatably arranged on the blade 5, and the two cutting elements 6 are respectively arranged on both sides of the connecting column 3.

[0031] As Figure 2 shown, in this embodiment, the connecting column 3 is configured in a cylindrical shape, and the connecting column 3 is rotatably passed through the blade 5.

[0032] Combined with Figure 1As shown, a mounting hole 53 for rotatably connecting with the connecting column 3 is provided on the cutter blade 5. The cutter blade 5 includes a fixing part 51 fixed on the drill bit and a connecting part 52 fixedly arranged on the fixing part 51. The fixing part 51 and the connecting part 52 jointly form the mounting hole 53. That is to say, if the connecting part 52 is separated from the fixing part 51, then there will be a notch on the circumferential side of the mounting hole 53. During the assembly process, the connecting column 3 can radially enter from the notch of the mounting hole 53. After the connecting column 3 is radially assembled into the mounting hole 53, the connecting part 52 is fixedly arranged on the fixing part 51 by welding or other means, thereby closing the mounting hole 53 and completing the assembly of the rotary spherical cutting tooth 100 on the cutter blade 5.

[0033] In this embodiment, the distance between the two cutting elements 6 is greater than the thickness of the cutter blade 5. Specifically, the length of the connecting column 3 is greater than the thickness of the cutter blade 5. After the connecting column 3 is assembled into the mounting hole 53 of the cutter blade 5, both axial ends of the connecting column 3 extend to the outside of the cutter blade 5. The two cutting elements 6 are respectively arranged at both axial ends of the connecting column 3, so that the distance between the two cutting elements 6 is greater than the thickness of the cutter blade 5, providing space for the two cutting elements 6 to rotate relative to the cutter blade 5.

[0034] In a specific embodiment, the cutting element 6 is configured as a sphere. The two spherical cutting elements 6 are respectively coaxially and fixedly arranged at both axial ends of the cylindrical connecting column 3.

[0035] Furthermore, the diameter of the cutting element 6 is greater than the diameter of the connecting column 3. During the drilling process, the cutting element 6 contacts the formation, preventing the formation from directly contacting the cutter blade 5, thereby effectively protecting the cutter blade 5.

[0036] According to the present invention, in this embodiment, the cutting element 6 includes a cutting tooth head 2 and a PDC grinding disc 1 coaxially arranged at the end of the connecting column 3. Specifically, the cutting tooth head 2 is configured as a cylinder, and the PDC grinding disc 1 is configured as a part of a sphere intercepted by a plane. As Figure 2 shown, the PDC grinding disc 1 in this embodiment is configured as a spherical crown shape, and the bottom surface of the PDC grinding disc 1 fits the end face shape of the cutting tooth head 2. The cutting tooth head 2 is coaxially and fixedly arranged at the end of the connecting column 3, and the PDC grinding disc 1 is arranged at the end of the cutting tooth head 2 far from the connecting column 3. As Figure 2 shown, the two cutting tooth heads 2 are respectively coaxially fixed at both axial ends of the connecting column 3, and a PDC grinding disc 1 is coaxially and fixedly arranged at the end of each cutting tooth head 2 far from the connecting column 3.

[0037] According to the present invention, the surface of the cutting element 6 close to the cutter blade 5 is configured to be parallel to the cutter blade 5. Specifically, in this embodiment, the surface of the cutting tooth head 2 of the cutting element 6 close to the cutter blade 5 is the assembly surface 4, and the contact surface between the assembly surface 4 and the cutter blade 5 is parallel.

[0038] In a specific embodiment, as Figure 1 shown, the projection surface of the blade 5 is set as a rectangle, and the surface of the cutting element 6 close to the blade 5 is set as a plane, that is, the assembly surface 4 is parallel to the end face of the blade 5.

[0039] The present invention is a double-headed rotatable spherical cutting tooth. The rotary spherical cutting tooth 100 is mainly used in the field of deep and hard formation drilling engineering. The rotary spherical cutting tooth 100 can be assembled on drill bits with any number of blades 5, such as three blades 5 or six blades 5, and there are no special requirements for the shape of the blade 5. The assembly surface 4 can be adjusted according to the shape of the blade 5. When using the rotary spherical cutting tooth 100 to drill hard formations, it is not necessary to control the direction of the rotary spherical cutting tooth 100 on the ground, which helps to improve the drill bit life, reduce the number of drill bit replacements, solve problems such as low drill bit footage and high drilling costs, and achieve cost reduction and efficiency increase in drilling operations.

[0040] During assembly, the connecting part 52 and the fixing part 51 are two separate parts, that is, they are in a mutually separated state. The PDC grinding disc 1, the cutting tooth head 2 and the connecting column 3 are of an integral structure. As Figure 1 shown, first, the cylindrical connecting column 3 is assembled into the mounting hole 53 of the fixing part 51, and there is a small gap between the assembly surface 4 and the upper and lower end faces of the blade 5, so that the cutting element 6 can rotate after being assembled into the mounting hole 53.

[0041] Furthermore, according to the number of blades 5 on the drill bit and the formation requirements, the assembly quantity and assembly position of the rotary spherical cutting tooth 100 can be selected.

[0042] When cutting the formation, as Figure 4 shown, the spherical PDC grinding discs 1 on both sides of the blade 5 of the rotary spherical cutting tooth 100 are in contact with the formation for cutting. Since the formation positions cut by the two PDC grinding discs 1 are different, the left PDC grinding disc 1 contacts the second cut formation 8 at point a, and the right PDC grinding disc 1 contacts the first cut formation 7 at point b. The force application points and the magnitudes of the forces are different, so that the rotary spherical cutting tooth 100 will generate a self-rotation movement during the cutting process and can rotate and cut 360 degrees, effectively improving the use efficiency of the PDC grinding disc 1 and extending the service life of the rotary spherical cutting tooth 100 and the drill bit.

[0043] The rotary spherical cutting tooth 100 provided by the present invention has a double-headed structure. Therefore, during the drilling process, the drill bit can adopt any one of the forward rotation and reverse rotation directions, or the two rotation directions can be used alternately, which is more conducive to improving the drilling efficiency.

[0044] Figure 5 shows an irregular blade 5. In this embodiment, the projection surface of the blade 5 is set as a trapezoid, as Figure 5As shown, the thickness on the left side of the cutter blade 5 is less than that on the right side. Correspondingly, the assembly surface 4 of the rotary spherical cutting tooth 100 is set as an inclined surface, that is, the assembly surface 4 is parallel to the end surface of the cutter blade 5.

[0045] In the description of the present invention, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0046] In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection", "fixation" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0047] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0048] Finally, it should be noted that the above are only the preferred implementation schemes of the present invention and do not constitute any limitation to the present invention. Although the present invention has been described in detail with reference to the foregoing implementation schemes, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rotary spherical cutting tooth, characterized in that, It includes two synchronously rotating cutting elements (6) rotatably arranged on both sides of the cutter blade (5), and the cutting surfaces of the cutting elements (6) are spherical surfaces.

2. The rotary spherical cutting tooth according to claim 1, wherein, A connecting column (3) is rotatably arranged on the cutter blade (5), and the two cutting elements (6) are respectively arranged on both sides of the connecting column (3).

3. The rotary spherical cutting tooth according to claim 2, characterized in that, The diameter of the cutting element (6) is larger than the diameter of the connecting column (3).

4. The rotary spherical cutting tooth according to claim 2, wherein, The distance between the two cutting elements (6) is larger than the thickness of the cutter blade (5).

5. The rotating spherical cutting tooth according to claim 2, characterized in that, The cutting element (6) includes a cutting tooth head (2) and a PDC grinding disc (1) coaxially arranged at the end of the connecting column (3).

6. The rotary spherical cutting tooth according to claim 5, wherein The cutting tooth head (2) is fixedly connected to the connecting column (3), and the PDC grinding disc (1) is arranged at one end of the cutting tooth head (2) far from the connecting column (3).

7. The rotary spherical cutting tooth according to claim 6, wherein The cutting tooth head (2) is constructed in a cylindrical shape, and the PDC grinding disc (1) is constructed in a spherical shape.

8. The rotary spherical cutting tooth according to any one of claims 1 to 7, wherein The surface of the cutting element (6) close to the cutter blade (5) is constructed to be parallel to the cutter blade (5).

9. The rotary spherical cutting tooth according to claim 8, wherein, The projection surface of the cutter blade (5) is rectangular, and the surface of the cutting element (6) close to the cutter blade (5) is a plane.

10. The rotary spherical cutting tooth according to any one of claims 2 to 9, characterized in that An installation hole (53) for rotatably connecting with the connecting column (3) is arranged on the cutter blade (5). The cutter blade (5) includes a fixing part (51) fixed on the drill bit and a connecting part (52) fixedly arranged on the fixing part (51). The fixing part (51) and the connecting part (52) jointly form the installation hole (53). After radially assembling the connecting column (3) into the installation hole (53), the connecting part (52) and the fixing part (51) are fixed, thereby closing the installation hole (53).

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