Drill bit

Abstract

The utility model relates to a drill bit and belongs to the technical field of drilling tools. Comprising an acceleration tool body; a first connecting end is arranged at one end of the speed increasing tool body, a second connecting end is arranged at one end of the drill bit body, and the first connecting end and the second connecting end are fixed in a contact mode; the limiting piece is located between the speed increasing tool body and the drill bit body and used for limiting the axial position of a lower end cover of the speed increasing tool body. When the speed increasing tool is used, the assembling length between the speed increasing tool body and the drill bit body can be reduced, the matching performance of the drill bit body and other drilling tools is improved, the application range is expanded, in addition, it can be guaranteed that the speed increasing tool body is prevented from circumferential torsion and axial movement in the using process, and therefore the using stability of the drill bit body is improved.

Description

TECHNICAL FIELD

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

[0002] In the oil and gas drilling engineering, the drilling tool used to break the rock of the stratum is a commonly used tool in the process of exploiting oil and natural gas.

[0003] For complex and difficult-to-drill strata such as hard, hard sandwich and high abrasiveness, the conventional diamond drill bit often has difficulty in eating in, low rock breaking efficiency and serious drill bit wear. Therefore, the current drilling tool combination mode of using a composite impact rock breaking speed increasing tool and a diamond drill bit is adopted, which applies additional impact energy to the diamond drill bit, which is beneficial to improve the rock breaking efficiency of the drill bit. However, the assembly of the drilling tool combination of the composite impact rock breaking speed increasing tool and the diamond drill bit needs to be installed by means of a joint, and the increase of the joint will increase the assembly length of the composite impact rock breaking speed increasing tool and the diamond drill bit, resulting in insufficient matching of the assembly of the drilling tool combination of the composite impact rock breaking speed increasing tool and the diamond drill bit with other drilling tools such as a screw drill tool. If the joint is tried to be cancelled to reduce the assembly length, although the matching problem is seemingly solved, the composite impact rock breaking speed increasing tool may appear the phenomena of circumferential torsion and axial movement due to the transmission of a large impact energy to the diamond drill bit. Such circumferential torsion and axial movement not only affects the stability of the drill bit, but also aggravates the friction between the drill bit and the rock and the wear between the components in the composite impact rock breaking speed increasing tool, thereby shortening the service life. SUMMARY

[0004] The embodiments of the present application provide a drill bit to solve the defect that the assembly of the drilling tool combination of the composite impact rock breaking speed increasing tool and the diamond drill bit connected by means of a joint will increase the assembly length and have insufficient matching with other drilling tools such as a screw drill tool.

[0005] The embodiments of the present application provide a drill bit, which comprises: a speed increasing tool body; a drill bit body, one end of the speed increasing tool body is provided as a first connecting end, one end of the drill bit body is provided as a second connecting end, and the first connecting end and the second connecting end are fixed in contact; and a limiting piece located between the speed increasing tool body and the drill bit body and used for limiting the position of a lower end cover of the speed increasing tool body.

[0006] In some embodiments, a bottom end of the speed increasing tool body is provided with a first connecting surface, and a top end of the drill bit body is provided with a second connecting surface, and the first connecting surface and the second connecting surface are fixed by welding.

[0007] In some embodiments, the cross section of the welding scar formed by welding the first connecting surface and the second connecting surface is arranged in a trapezoidal shape.

[0008] In some embodiments, one end of the short side of the welding scar is arranged close to the inner wall of the speed-up tool body, and one end of the long side of the welding scar is arranged close to the outer wall of the speed-up tool body.

[0009] In some embodiments, the limiting piece includes a first limiting surface, the bottom end of the speed-up tool body is cut to form a first step portion recessed inward on the inner wall thereof, the first limiting surface is located on the first step portion, and the top surface of the lower end cover of the speed-up tool body abuts against the first limiting surface.

[0010] In some embodiments, the limiting piece further includes a second limiting surface, the drill bit body is cut to form a second step portion protruding outward close to the lower end of the speed-up tool body, the second limiting surface is located on the second step portion, and the lower end surface of the lower end cover of the speed-up tool body abuts against the second limiting surface.

[0011] In some embodiments, the bottom end of the speed-up tool body is provided with an inner threaded segment on the inner wall thereof, the outer wall of the drill bit body is provided with an outer threaded segment, and the inner threaded segment and the outer threaded segment are matched to fix the drill bit body on the speed-up tool body.

[0012] In some embodiments, the limiting piece includes a third limiting surface, the inner wall of the speed-up tool body is cut to form a groove, the third limiting surface is located on the top wall of the groove, the outer edge flange of the lower end cover of the speed-up tool body is located in the groove, and the third limiting surface abuts against the top end of the lower end cover of the speed-up tool body.

[0013] In some embodiments, the limiting piece further includes a fourth limiting surface, the drill bit body is cut to form a third step portion protruding outward close to the lower end of the speed-up tool body, the fourth limiting surface is formed on the third step portion, and the bottom end of the lower end cover 10 of the speed-up tool body abuts against the fourth limiting surface.

[0014] In some embodiments, the drill bit body includes a lower sleeve, a blade wing, a cutting tooth, and a drill bit nozzle, the lower sleeve is fixed with the speed-up tool body, the blade wing is arranged on the outer periphery of the lower sleeve, the cutting tooth is distributed on the blade wing, the drill bit nozzle is arranged on the lower sleeve, and the jet direction is towards the cutting tooth.

[0015] The technical scheme provided in the application has the beneficial effects including:

[0016] The drill bit provided by the embodiment of the present application has a speed-increasing tool body, a drill bit body, a limiting member, and the like, and has the advantages that the drill bit body is directly fixed to the speed-increasing tool body, the assembly length between the drill bit body and the speed-increasing tool body is reduced, the matching of the drill bit body with other drilling tools is higher, the application range of the drill bit body is wider, the position of the lower end cover of the speed-increasing tool body is limited by the limiting member, the axial and circumferential displacement of the lower end cover does not affect the use of the drill bit body, and the stability and reliability of the drill bit body during use are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0018] Figure 1 The overall structural schematic diagram provided by the embodiment of the present application is shown in the figure.

[0019] Figure 2 The cross-sectional schematic diagram provided by the embodiment of the present application is shown in the figure.

[0020] Figure 3 The embodiment of the present application Figure 2 The enlarged schematic diagram of A in the embodiment of the present application is shown in the figure.

[0021] Figure 4 The schematic diagram provided by the embodiment of the present application is shown in the figure.

[0022] Reference signs:

[0023] 1, speed-increasing tool body; 10, lower end cover; 2, drill bit body; 20, lower sleeve; 21, blade; 22, cutting tooth; 23, drill bit nozzle; 3, first connecting surface; 4, second connecting surface; 5, weld; 60, first limiting surface; 600, first step portion; 61, second limiting surface; 610, second step portion; 70, third limiting surface; 700, groove; 71, fourth limiting surface; 710, third step portion. DETAILED DESCRIPTION

[0024] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0025] The drilling bit provided by the embodiments of the present application can solve the problem that the assembly of the drilling tool combination of the composite impact rock breaking speed increasing tool and the diamond drilling bit increases the assembly length by means of the joint connection, and the matching with other drilling tools such as the screw drill is insufficient.

[0026] Referring to Figures 1 to 4 As shown in the figure, the drilling bit provided by the embodiments of the present application comprises a speed increasing tool body 1, a drilling bit body 2 and a limiting piece. The speed increasing tool body 1 is a tool that converts fluid energy into high-frequency axial and torsional impact energy by using drilling fluid as a driving medium. The axial impact can make the drilling bit body 2 obtain additional axial rock breaking energy, and the torsional impact can eliminate or reduce the "stick-slip" phenomenon of the drilling bit body, thereby improving the mechanical drilling speed and footage of the drilling bit. The composite impact mode can make the drilling bit body 2 have a three-dimensional rock breaking effect, and significantly improve the rock breaking efficiency and mechanical drilling speed.

[0027] In the present application, the drilling bit body 2 comprises a lower sleeve 20, a blade 21, a cutting tooth 22 and a drilling bit nozzle 23. The lower sleeve 20 is fixed with the speed increasing tool body 1. The blade 21 is arranged on the outer periphery of the lower sleeve 20. The cutting tooth 22 is distributed on the blade 21. The drilling bit nozzle 23 is arranged on the lower sleeve 20, and the jet direction is towards the cutting tooth 22. The lower sleeve 20 serves as the main part of the drilling bit body 2, and is fixed with the speed increasing tool body 1 through direct connection, thereby providing stable support for the drilling bit body 2 and ensuring the stability and reliability in the drilling process. The rotating power generated by the speed increasing tool body 1 is transmitted to the blade 21 and the cutting tooth 22 through the lower sleeve 20, thereby driving them to perform the formation breaking operation. In the drilling process, the drilling fluid is sprayed out in the form of high pressure through the drilling bit nozzle 23 to clean the bottom of the well, thereby ensuring that the cutting tooth 22 can always maintain good contact with the formation.

[0028] In the present application, by setting one end of the speed-up tool body 1 as the first connecting end, one end of the drill bit body 2 as the second connecting end, and contacting and fixing the first connecting end and the second connecting end, the close connection between the speed-up tool body 1 and the drill bit body 2 is ensured, and the loosening or falling off phenomenon that may occur during drilling is avoided, thereby ensuring the continuity and stability of drilling. And through the contact and fixation of the first connecting end and the second connecting end, the drill bit body 2 is directly fixed with the speed-up tool body 1, the assembly length between the speed-up tool body 1 and the drill bit body 2 is reduced, and the assembly of the composite impact rock breaking speed-up tool and the diamond drill bit drilling tool combination has good matching with other drilling tools such as screw drill tools, thereby improving the application range.

[0029] In addition, it is also considered that directly connecting the speed-up tool body 1 and the drill bit body 2, the speed-up tool body 1 may have circumferential torsion and axial movement during operation due to the large impact energy transmitted by the drill bit body 2 during use. Such circumferential torsion and axial movement not only affects the stability of the drill bit body 2, but also exacerbates the friction between the drill bit body 2 and the rock and the wear between the components inside the speed-up tool body 1, thereby shortening the service life. Therefore, the limiting piece is arranged between the speed-up tool body 1 and the drill bit body 2 and is used to limit the position of the lower end cover 10 of the speed-up tool body 1.

[0030] In the present application, the connection mode of the speed-up tool body 1 and the drill bit body 2 includes but is not limited to that a first connecting surface 3 is arranged at the bottom end of the speed-up tool body 1, a second connecting surface 4 is arranged at the top end of the drill bit body 2, and then the first connecting surface 3 and the second connecting surface 4 are fixed by welding. As a kind of permanent connection mode, welding can tightly connect the speed-up tool body 1 and the drill bit body 2 together to form an integral structure. This connection mode has high strength and stability and can withstand various impacts and vibrations during drilling.

[0031] In the present application, in order to enhance the welding strength, the cross section of the welding scar 5 formed by welding the first connecting surface 3 and the second connecting surface 4 is trapezoidal. The cross-sectional area of the weld is increased, thereby enhancing the strength of the welded joint. This design makes the weld better disperse stress when bearing external force, avoiding the cracking or breaking of the weld caused by stress concentration. At the same time, the trapezoidal cross section also provides better shear resistance and fatigue resistance, so that the welded joint maintains stable performance in long-term use.

[0032] In addition, one end of the short side of the welding scar 5 is arranged close to the inner wall of the speed-up tool body 1, and one end of the long side of the welding scar 5 is arranged close to the outer wall of the speed-up tool body 1. During the welding process, a certain stress will be generated in the welding area. By arranging the short side of the welding scar 5 close to the inner wall of the speed-up tool body 1, the influence of the shrinkage and deformation of the welding seam on the speed-up tool body 1 will be relatively small, thereby reducing the risk of cracking or deformation caused by stress concentration.

[0033] In the present application, the limiting member arranged includes a first limiting surface 60, the bottom end of the speed-up tool body 1, and a first step portion 600 recessed inward is cut on the inner wall thereof, the first limiting surface 60 is located on the first step portion 600, and the top surface of the lower end cover 10 of the speed-up tool body 1 abuts against the first limiting surface 60. Further, under the abutting pressure of the first limiting surface 60, the lower end cover 10 of the speed-up tool body 1 is effectively pressed tightly, avoiding the circumferential torsion and axial movement of the speed-up tool body 1, and the structure is simple and reliable.

[0034] The limiting member arranged also includes a second limiting surface 61, a second step portion 610 protruding outward is cut on the drill bit body 2 close to the lower end of the speed-up tool body 1, the second limiting surface 61 is located on the second step portion 610, and the lower end surface of the lower end cover 10 of the speed-up tool body 1 abuts against the second limiting surface 61. The second limiting surface 61 is located on the second step portion 610 protruding outward on the drill bit body 2 and abuts against the lower end surface of the lower end cover 10 of the speed-up tool body 1. This design provides a double limiting structure, ensuring the connection stability and positioning accuracy between the drill bit body 2 and the speed-up tool body 1, and further avoiding the circumferential torsion and axial movement.

[0035] In some optional embodiments, the connection mode of the speed-up tool body 1 and the drill bit body 2 includes but is not limited to that an inner thread segment (not shown in the figure) is arranged at the bottom end of the speed-up tool body 1 and on the inner wall thereof, an outer thread segment (not shown in the figure) is arranged on the outer wall of the drill bit body 2, and the inner thread segment and the outer thread segment are matched to fix the drill bit body 2 on the speed-up tool body 1. When the inner thread segment and the outer thread segment are rotated and tightly matched with each other, a stable connection structure can be formed. In the drilling operation, the speed-up tool body 1 and the drill bit body 2 will be subjected to strong vibration and impact force from the formation. The matching of the inner thread segment and the outer thread segment can effectively resist these vibrations and impact forces, preventing the drill bit from loosening or falling off during the operation.

[0036] The connecting mode of the speed increasing tool body 1 and the drill bit body 2 adopts the cooperation of the internal thread section and the external thread section, the limiting piece is provided with the third limiting surface 70, the recess 700 is cut and formed on the inner wall of the speed increasing tool body 1, the third limiting surface 70 is located on the top wall of the recess 700, the outer edge flange of the lower end cover 10 of the speed increasing tool body 1 is located in the recess 700, and the third limiting surface 70 abuts against the top end of the lower end cover 10 of the speed increasing tool body 1. The third limiting surface 70 is located on the top wall of the recess 700, and provides an accurate positioning point for the outer edge flange of the lower end cover 10 of the speed increasing tool body 1. When the flange of the lower end cover 10 is correctly placed in the recess 700 and abuts against the third limiting surface 70, the circumferential torsion and axial movement of the speed increasing tool body 1 can be prevented.

[0037] The limiting piece is also provided with the fourth limiting surface 71, the third stepped portion 710 protruding outward is cut and formed on the drill bit body 2 close to the lower end of the speed increasing tool body 1, the fourth limiting surface 71 is formed on the third stepped portion 710, the bottom end of the lower end cover 10 of the speed increasing tool body 1 abuts against the fourth limiting surface 71, and the third stepped portion 710 not only provides a containing space for the lower end cover 10 but also plays a limiting role. The fourth limiting surface 71 abuts against the bottom wall of the third stepped portion 710 to limit the movement of the lower end cover 10 in the vertical direction, thereby further enhancing the stability of the connection.

[0038] In the description of the present application, it should be noted that the positions or position relationships indicated by the terms "upper", "lower" and the like are based on the positions or position relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular position, be constructed and operated in a particular position, and therefore cannot be understood as a limitation on the present application. Unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, and can be the communication between two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0039] It should be noted that, in the present application, the relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another, without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0040] The foregoing is merely illustrative of the principles of the application and various modifications can be made by those skilled in the art without departing from the spirit and scope of the application. The above embodiments are illustrative, and not restrictive, of the scope of the application.

Claims

1. A drill bit, characterized in that, include: Speed-up tool body (1); The drill bit body (2) has one end of the speed-up tool body (1) as a first connecting end and one end of the drill bit body (2) as a second connecting end, with the first connecting end and the second connecting end in contact and fixed. A limiting element is located between the speed-up tool body (1) and the drill bit body (2) and is used to limit the position of the lower end cap (10) of the speed-up tool body (1).

2. A drill bit as described in claim 1, characterized in that: The bottom end of the speed-up tool body (1) is provided with a first connecting surface (3), and the top end of the drill bit body (2) is provided with a second connecting surface (4). The first connecting surface (3) and the second connecting surface (4) are fixed by welding.

3. A drill bit as described in claim 2, characterized in that: The weld scar (5) formed by welding the first connecting surface (3) and the second connecting surface (4) has a trapezoidal cross section.

4. A drill bit as described in claim 3, characterized in that: The short side of the weld scar (5) is located close to the inner wall of the speed-up tool body (1), and the long side of the weld scar (5) is located close to the outer wall of the speed-up tool body (1).

5. A drill bit as described in claim 2, characterized in that: The limiting member includes a first limiting surface (60), the bottom end of the speed-up tool body (1), and a first step portion that is recessed inward is cut on its inner wall. The first limiting surface (60) is located on the first step portion, and the top surface of the lower end cap (10) of the speed-up tool body (1) abuts against the first limiting surface (60).

6. A drill bit as described in claim 5, characterized in that: The limiting component also includes a second limiting surface (61). The drill bit body (2) has a second step portion (610) that protrudes outwardly near the lower end of the speed-up tool body (1). The second limiting surface (61) is located on the second step portion (610). The lower end face of the lower end cover (10) of the speed-up tool body (1) abuts against the second limiting surface (61).

7. A drill bit as described in claim 1, characterized in that: The bottom end of the speed-up tool body (1) is provided with an internal thread section on its inner wall, and the outer wall of the drill bit body (2) is provided with an external thread section. The internal thread section and the external thread section cooperate to fix the drill bit body (2) on the speed-up tool body (1).

8. A drill bit as described in claim 7, characterized in that: The limiting component includes a third limiting surface (70). A groove (700) is cut and formed on the inner wall of the speed-up tool body (1). The third limiting surface (70) is located on the top wall of the groove (700). The outer edge of the lower end cap (10) of the speed-up tool body (1) is located in the groove (700). The third limiting surface (70) abuts against the top of the lower end cap (10) of the speed-up tool body (1).

9. A drill bit as described in claim 8, characterized in that: The limiting component also includes a fourth limiting surface (71). The drill bit body (2) has a third step portion (710) that protrudes outwardly near the lower end of the speed-up tool body (1). The fourth limiting surface (71) is formed on the third step portion (710). The bottom end of the lower end cap (10) of the speed-up tool body (1) abuts against the fourth limiting surface (71).

10. A drill bit as described in claim 1, characterized in that: The drill body (2) includes a lower sleeve (20), a blade (21), cutting teeth (22), and a drill nozzle (23). The lower sleeve (20) is fixed to the speed-up tool body (1). The blade (21) is located on the outer periphery of the lower sleeve (20). The cutting teeth (22) are distributed on the blade (21). The drill nozzle (23) is located on the lower sleeve (20) and the spray direction is towards the cutting teeth (22).

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