Composite sheet tooth drill bit
By designing taper drilling sheets on the PDC drill bits and optimizing the stress mode of cemented carbide teeth, the problem of low rock breaking efficiency in the hardness-changing formation of PDC drill bits is solved, achieving higher mechanical drilling speed and cost savings.
Patent Information
- Application Number
- CN202422187336.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-06
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-09-06
AI Technical Summary
The existing PDC drill bits have low rock breaking efficiency in formations with varying hardness, and poor stability of cemented carbide sheets, resulting in accelerated wear, affecting construction efficiency and increasing costs.
Design a composite sheet tooth drill bit, and optimize the stress mode of carbide teeth by setting a taper part on the top of the drill piece, improve the rock breaking effect and improve the mechanical drilling speed.
It improves the single-pass drilling ruler and mechanical drilling speed, reduces drilling costs, and improves the service life and construction efficiency of the drill bit.
Smart Images
Figure CN223164480U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of oil and gas exploitation, and particularly relates to a composite insert bit. Background Art
[0002] In the prior art, the cemented carbide inserts of current conventional PDC (Polycrystalline Diamond Compact Bit) bits have a cylindrical flat surface structure. The cutting surface of the PDC bit is flat. The thickness of the PDC bit is generally between 1 mm and 3 mm, and the diameter of the PDC bit is between 11 mm and 25 mm.
[0003] During the construction of conventional and unconventional oil and gas drilling, PDC bits are particularly suitable for coalbed methane drilling. However, due to comprehensive factors such as the change of formation hardness, the increase of rock hardness with the increase of well depth, and unstable operation, the rock-breaking efficiency of PDC bits is low. The composite inserts on the PDC bit generate high temperature due to friction at the same position, resulting in a decrease in the stability of the composite inserts, accelerated wear, and serious wear of the shoulder and nose teeth. Or the static load of the inner teeth of the PDC bit is overloaded, causing tooth chipping and triggering a chain reaction, ultimately leading to core extraction. Or due to strong formation abrasiveness, after the shoulder teeth of the PDC bit are worn to a certain extent, the matrix directly contacts the formation and wears, resulting in results such as diameter reduction, causing low efficiency or failure of the PDC bit.
[0004] To sum up, due to the forced stop of rock-breaking operations of the existing PDC bits, it is necessary to pull out the drill string to replace the bit. The PDC bit not only fails to achieve the rock-breaking effect, but also seriously affects the drilling construction efficiency, greatly increasing the drilling cost and construction risk. Summary of the Utility Model
[0005] The purpose of the utility model is to provide a composite insert bit to solve the problems of poor rock-breaking effect and high construction risk of the existing bits.
[0006] Therefore, an embodiment of the utility model provides a composite insert bit.
[0007] The composite insert bit according to the embodiment of the utility model includes: a main body, the main body is cylindrical, and an installation port is arranged at the lower end of the main body, and the installation port is adapted to be installed on a rotary drive device; a drill body part, the drill body part is spherical, the drill body part is arranged at the upper end of the main body, and convex ribs are arranged on the drill body part; drill inserts, there are a plurality of drill inserts, each drill insert includes a cylindrical part and a tapered part arranged at the top of the cylindrical part, and the plurality of drill inserts are arranged on the convex ribs, and the tapered parts of the drill inserts have the same orientation.
[0008] According to the composite insert bit of the present utility model, by optimizing the top structure of the insert, the top of the insert has a tapered portion, which improves the stress condition when the cemented carbide teeth of the PDC bit break rocks, greatly increases the footage per single trip and the mechanical drilling speed, and saves costs.
[0009] In some embodiments, there are multiple convex ribs, and the multiple convex ribs are spaced apart on the drill body portion, and the length direction of the convex ribs is the same as the length direction of the main body, and multiple inserts are provided on each convex rib.
[0010] In some embodiments, the structure of the tapered portion includes, but is not limited to, a conical structure and a single-side slope structure.
[0011] In some embodiments, on the longitudinal section of the tapered portion of the conical structure, the slope of the tapered portion is between 75° and 80°.
[0012] In some embodiments, on the longitudinal section of the tapered portion of the single-side slope structure, the shape of the tapered portion is a right trapezoid, and the slope of the hypotenuse of the right trapezoid is between 75° and 80°.
[0013] In some embodiments, the convex rib includes two parallel sub-ribs, and multiple inserts are provided on each sub-rib.
[0014] In some embodiments, the insert is fixed on the convex rib by integral sintering.
[0015] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and do not limit the present disclosure. According to the following detailed description of the exemplary embodiments with reference to the accompanying drawings, other features and aspects of the present disclosure will be clearer. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required to be used in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0017] Figure 1 is a perspective view of a composite insert bit according to an embodiment of the present utility model.
[0018] Figure 2 is a cross-sectional view of an insert in a composite insert bit according to an embodiment of the present utility model.
[0019] Figure 3It is another cross-sectional view of the drill bit in the composite insert bit according to an embodiment of the present invention.
[0020] Reference numerals:
[0021] Composite insert bit 100, main body 10, drill body part 20, convex rib 30, dividing rib 31.
[0022] Drill bit 40, cylindrical part 41, tapered part 42, conical structure 421, unilateral slope structure 422. Detailed implementation manners
[0023] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific implementation manners. However, those skilled in the art should understand that the implementation manners described below are only used to illustrate the present invention and should not be regarded as limiting the scope of the present invention. All other implementation manners obtained by those of ordinary skill in the art based on the implementation manners in the present invention without creative efforts belong to the scope of protection of the present invention.
[0024] It should be noted that the PDC bit (Polycrystalline Diamond Compact Bit), abbreviated as PDC bit, is also called polycrystalline diamond cutting block bit or composite insert bit. It is formed by mounting or sintering polycrystalline diamond (thin circular sheet) into small cutting blocks on the bit body.
[0025] In the present invention, by changing the appearance shape of the cemented carbide, its force application mode is changed, the impact resistance and cutting efficiency of the cemented carbide cutting insert during downhole operation are improved, and the design is simple and the manufacturing is convenient. The present invention mainly solves the problems of impact resistance and cutting efficiency of the PDC bit teeth in soft-hard cemented formations and medium-hard formations, improves the applicability and service life of the PDC bit to different formations, improves the use efficiency of a single bit to make it more in line with the working characteristics of coalbed methane drilling construction, further improves the single-trip drilling footage and mechanical drilling speed, so as to meet the needs of well drilling speed increase and drilling cost reduction.
[0026] As Figure 1 shown, the composite insert bit 100 according to an embodiment of the present invention includes:
[0027] Main body 10, the main body 10 is cylindrical, and an installation port is provided at the lower end of the main body 10, and the installation port is adapted to be installed on a rotary drive device;
[0028] Drill body part 20, the drill body part 20 is spherical, the drill body part 20 is provided at the upper end of the main body 10, and convex ribs 30 are provided on the drill body part 20;
[0029] Drill bits 40, there are multiple drill bits 40, the drill bit 40 includes a cylindrical portion 41 and a tapered portion 42 provided at the top of the cylindrical portion 41, and the multiple drill bits 40 are arranged on the convex rib 30, and the orientations of the tapered portions 42 of the drill bits 40 are the same.
[0030] For the composite insert bit 100 according to the present invention, by optimizing the top structure of the drill bit 40, the top of the drill bit 40 has a tapered portion 42, which improves the stress condition when the PDC bit cemented carbide teeth break rocks, greatly improves the single-trip drilling footage and the mechanical drilling speed, and saves costs.
[0031] In some embodiments, such as Figure 1 shown, there are multiple convex ribs 30, and the multiple convex ribs 30 are spaced apart on the drill body portion 20, and the length direction of the convex rib 30 is the same as the length direction of the main body 10, and multiple drill bits 40 are provided on each convex rib 30.
[0032] In some embodiments, such as Figure 2 and Figure 3 shown, the structure of the tapered portion 42 includes, but is not limited to, a conical structure 421 and a single-sided slope structure 422.
[0033] In some embodiments, such as Figure 2 shown, in the longitudinal section of the tapered portion 42 of the conical structure 421, the slope of the tapered portion 42 is between 75° - 80°.
[0034] In some embodiments, such as Figure 3 shown, in the longitudinal section of the tapered portion 42 of the single-sided slope structure 422, the shape of the tapered portion 42 is a right trapezoid, and the slope of the hypotenuse of the right trapezoid is between 75° - 80°.
[0035] It can be understood that the main change of the present invention is that the plane design of the cutting part of the PDC bit cemented carbide teeth is changed to a taper design, and the angle between the surface of the cemented carbide insert and the horizontal plane is between 10° - 15° (i.e., the slope is between 75° - 80°). When the force on the bit changes, the tapered surface design of the cemented carbide teeth bears part of the axial pressure change, reduces the vibration frequency of the cemented carbide teeth, reduces the friction amplitude between the cemented carbide inserts at the same position and the formation, effectively protects the stability of the cemented carbide teeth, slows down wear, and improves the ability of the cemented carbide teeth to resist alternating loads. At the same time, the taper design of the cutting surface of the cemented carbide teeth can reduce the contact surface when breaking rocks, improve the rock-breaking efficiency, increase the mechanical drilling speed, and effectively solve the inadaptability of the current PDC cemented carbide inserts to some formations.
[0036] The beneficial effects of the present utility model are to improve the single-pass footage and mechanical drilling rate. Experiments on multiple wells have shown that the designed cemented carbide inserts have shown good effects in terms of footage and drilling rate compared with conventional PDC cemented carbide inserts. Comparing data of the same formation, the footage is increased by about 10%, the mechanical drilling rate is increased by 5%, and the cost is increased by nearly 3%.
[0037] In some embodiments, such as Figure 1 shown, the convex rib 30 includes two juxtaposed sub-ribs, and a plurality of the drill bits 40 are provided on each of the sub-ribs.
[0038] In some embodiments, such as Figure 1 shown, the drill bit 40 is fixed on the convex rib 30 by an integral sintering method.
[0039] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model.
[0040] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0041] In the present utility model, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0042] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.
[0043] In the present utility model, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean 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 utility model. 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 may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.
[0044] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.
Claims
1. A composite insert bit, characterized in that, Comprising: A main body, which is cylindrical. An installation opening is provided at the lower end of the main body, and the installation opening is adapted to be installed on a rotary driving device; A drill body part, which is spherical. The drill body part is arranged at the upper end of the main body, and convex ridges are provided on the drill body part; Drill bits, there are multiple drill bits. Each drill bit includes a cylindrical part and a taper part provided at the top of the cylindrical part. The multiple drill bits are arranged on the convex ridges, and the orientations of the taper parts of the drill bits are the same.
2. The composite insert bit according to claim 1, wherein There are multiple convex ridges. The multiple convex ridges are spaced apart on the drill body part, and the length direction of the convex ridges is the same as the length direction of the main body. Multiple drill bits are provided on each convex ridge.
3. The composite insert bit according to claim 2, wherein The structure of the taper part includes, but is not limited to, a conical structure and a single-sided slope structure.
4. The composite insert bit according to claim 3, wherein On the longitudinal section of the taper part of the conical structure, the slope of the taper part is between 75° and 80°.
5. The composite insert bit according to claim 3, wherein On the longitudinal section of the taper part of the single-sided slope structure, the shape of the taper part is a right trapezoid, and the slope of the hypotenuse of the right trapezoid is between 75° and 80°.
6. The composite insert bit according to claim 3, wherein The convex ridge includes two juxtaposed sub-ridges, and multiple drill bits are provided on each sub-ridge.
7. The composite insert bit according to claim 3, wherein The drill bits are fixed on the convex ridges by integral sintering.