High-impact-resistance multi-edge polycrystalline diamond compact

Abstract

The utility model relates to the technical field of superhard composite materials, in particular to a high-impact-resistance multi-blade polycrystalline diamond compact which comprises a hard alloy matrix and a polycrystalline diamond layer located at one end of the hard alloy matrix. The polycrystalline diamond layer comprises a central part located at the central position, a tangent plane formed by extending from the edge of the central part to the edge of the polycrystalline diamond layer, and a plurality of cutting edges located on the tangent plane; the blade comprises a first cutting face, a second cutting face and an intersection ridge formed by intersection of the first cutting face and the second cutting face. By means of the structural arrangement, the rock breaking capacity of the compact on the two sides of the cutting edges can be kept consistent, overall stress is even, the stress of the compact on a drill bit matrix is optimized, the drilling efficiency and the rock breaking efficiency are greatly improved through the arrangement of the multiple cutting edges, the PDC drill bit replacement frequency is reduced, and therefore the drilling cost is saved; the multiple blade teeth can buffer impact from rocks in a heterogeneous stratum, damage is reduced, and the service life of the PDC is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of superhard composite materials, in particular to a high-impact-resistant multi-edged polycrystalline diamond composite sheet. Background Art

[0002] Polycrystalline diamond (PDC) drill bits have been widely used in oil and gas drilling projects. As the depth of oil and gas extraction increases, the formations encountered become more and more complex, especially in some hard and heterogeneous rock formations, and the requirements for drill bits are also getting higher and higher.

[0003] PDC has the characteristics of high strength, strong brittleness and poor toughness. For conventional single-tooth PDC structures, when impacted by hard rocks such as conglomerate and granite in hard, heterogeneous rock formations, it is very easy to cause edge chipping or even cracking. PDC with chipped tooth damage will quickly fail, causing the PDC drill bit to be unable to continue drilling and fail prematurely, which will increase the frequency of PDC drill bit replacement, extend the drilling cycle, and increase drilling costs.

[0004] Therefore, the existing technology still needs to be improved and developed. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a highly impact-resistant multi-edge polycrystalline diamond compact, aiming to solve the problems of the existing PDC structure being prone to edge chipping and having low rock breaking efficiency.

[0006] The technical solution of the utility model is as follows:

[0007] A high-impact-resistant multi-edged polycrystalline diamond composite sheet comprises a cemented carbide substrate and a polycrystalline diamond layer located at one end of the cemented carbide substrate;

[0008] The polycrystalline diamond layer includes a central portion located at a central position, a cutting surface formed by extending from the edge of the central portion to the edge of the polycrystalline diamond layer, and a plurality of blades located on the cutting surface; the blade includes a first cutting surface, a second cutting surface, and an intersecting ridge formed by the intersection of the first cutting surface and the second cutting surface.

[0009] The high-impact-resistant multi-blade polycrystalline diamond composite sheet, wherein the number n of the blades is 2≤n≤5, and is evenly distributed along the outer diameter circumference of the polycrystalline diamond layer at 360° / n.

[0010] The high-impact-resistant multi-blade polycrystalline diamond composite sheet, wherein the angle between the first cutting surface and the cutting surface is between 120° and 170°; the angle between the second cutting surface and the cutting surface is between 120° and 170°.

[0011] The high-impact-resistant multi-blade polycrystalline diamond compact, wherein the first cutting surface and the second cutting surface are symmetrically arranged relative to the intersecting ridge.

[0012] In the high-impact-resistant multi-blade polycrystalline diamond compact, the intersecting ridges are straight intersecting ridges or arcuate intersecting ridges; the arcuate intersecting ridges are concave downward or convex upward relative to the bottom surface of the multi-blade polycrystalline diamond compact.

[0013] In the high-impact-resistant multi-edged polycrystalline diamond composite sheet, the angle between the ridge line of the straight-line intersecting ridges or the tangent line of the arc-line intersecting ridges and the horizontal plane is between -8° and 8°.

[0014] The high-impact-resistant multi-edged polycrystalline diamond composite sheet, wherein the central portion is a planar structure, a concave structure or a convex structure.

[0015] In the high-impact-resistant multi-edged polycrystalline diamond compact, relative to a horizontal plane, an end of the cut surface close to the center portion is higher than an end close to the edge of the polycrystalline diamond layer.

[0016] The high-impact-resistant multi-edged polycrystalline diamond composite sheet, wherein the angle between the cut surface and the horizontal plane is 15° to 45°.

[0017] The high-impact-resistant multi-blade polycrystalline diamond composite sheet, wherein the polycrystalline diamond layer has a first surface in contact with the cemented carbide substrate and a second surface opposite to the first surface, and the first surface and the second surface are both curved structures; the polycrystalline diamond layer is provided with chamfers or has no chamfers; the cross-sectional profile of the blade is arc-shaped or angular.

[0018] Beneficial effects: The present invention provides a highly impact-resistant multi-blade polycrystalline diamond composite sheet, comprising a cemented carbide substrate and a polycrystalline diamond layer located at one end of the cemented carbide substrate; the polycrystalline diamond layer comprises a central portion located at a central position, a cut surface extending from the edge of the central portion to the edge of the polycrystalline diamond layer, and a plurality of blades located on the cut surface; the blade comprises a first cutting surface, a second cutting surface, and an intersecting ridge formed by the intersection of the first cutting surface and the second cutting surface. The present invention provides a plurality of blades on the cut surface extending outward from the central portion of the polycrystalline diamond layer, and the blade comprises a first cutting surface, a second cutting surface, and an intersecting ridge formed by the intersection of the first cutting surface and the second cutting surface. This arrangement enables the composite sheet to maintain consistent rock-breaking capabilities on both sides of the blade, uniformly bears overall force, thereby optimizing the force on the composite sheet on the drill bit matrix, and the multi-blade arrangement greatly improves drilling efficiency and rock-breaking efficiency, reduces the frequency of replacing PDC drill bits, and thus saves drilling costs. In addition, the multi-edge teeth provided by the present invention can buffer the impact from rocks in heterogeneous formations, reduce damage and increase the service life of the PDC drill bit, thereby increasing the drilling distance of the PDC drill bit and reducing drilling costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of a high impact resistant multi-edge polycrystalline diamond composite sheet of the utility model;

[0020] Figure 2 This is a schematic structural diagram of a high impact resistant four-edged polycrystalline diamond composite sheet in Example 2 of the present utility model;

[0021] Description of reference numerals: cemented carbide substrate 10 , polycrystalline diamond layer 20 , central portion 21 , cutting surface 22 , blade 23 , first cutting surface 231 , second cutting surface 232 , intersecting ridge 233 . DETAILED DESCRIPTION

[0022] The present invention provides a high-impact multi-edge polycrystalline diamond composite sheet. To make the purpose, technical solution, and effects of the present invention clearer and more specific, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention.

[0023] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application 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 therefore cannot be understood as limiting this application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of the said features.

[0024] Those skilled in the art will understand that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as those generally understood by those skilled in the art in the field to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0025] like Figure 1 As shown, the utility model provides a high impact resistance multi-edge polycrystalline diamond composite sheet, comprising a cemented carbide substrate 10 and a polycrystalline diamond layer 20 located at one end of the cemented carbide substrate 10;

[0026] The polycrystalline diamond layer 20 includes a central portion 21 located at the center, a cutting surface 22 formed by extending from the edge of the central portion 21 to the edge of the polycrystalline diamond layer 20, and a plurality of blades 23 located on the cutting surface 22; the blade 23 includes a first cutting surface 231, a second cutting surface 232 and an intersecting ridge 233 formed by the intersection of the first cutting surface 231 and the second cutting surface 232.

[0027] In this embodiment, a plurality of blades are provided on the cut surface extending outward from the center of the polycrystalline diamond layer, and the blade 23 includes a first cutting surface 231, a second cutting surface 232, and an intersecting ridge 233 formed by the intersection of the first cutting surface 231 and the second cutting surface 232. This arrangement enables the rock-breaking ability of the composite piece on both sides of the blade to remain consistent, and the overall force is uniform, thereby optimizing the force applied to the composite piece on the drill bit matrix. The multi-blade arrangement greatly improves the drilling efficiency and rock-breaking efficiency, reduces the frequency of replacing the PDC drill bit, and thus saves drilling costs. In addition, the multi-blade teeth provided by the utility model can buffer the impact from rocks in heterogeneous formations, reduce damage, and increase the service life of the PDC, thereby increasing the drilling distance of the PDC drill bit and reducing drilling costs.

[0028] Specifically, the high-impact-resistant multi-blade polycrystalline diamond composite sheet of the present invention includes a columnar cemented carbide substrate, a polycrystalline diamond layer bonded to one end of the cemented carbide substrate, the polycrystalline diamond layer including a central portion, a cut surface extending outward from the central portion, a blade on the edge of the cut surface, and a curved surface structure between adjacent blades, wherein the blade is formed by the cutting surface at a certain angle. The polycrystalline diamond composite sheet with this structure has the advantages of strong cutting ability and high drilling efficiency, and has a long service life. In addition, the multi-blade polycrystalline diamond composite sheet provided by the present invention has a multi-blade tooth structure, which increases the contact area with the rock compared to the flat tooth and single-blade tooth structures, thereby improving the rock breaking efficiency on hard rocks.

[0029] In some embodiments, the number n of the blades 23 is 2 ≤ n ≤ 5, and they are evenly distributed along the outer diameter of the polycrystalline diamond layer at a ratio of 360° / n. The number of blades 23 is between 2 and 5, and their even distribution along the outer diameter of the polycrystalline diamond layer at a ratio of 360° / n can provide the diamond compact with the advantages of strong cutting ability, high drilling efficiency, and a long service life. The multi-blade configuration significantly improves drilling efficiency and rock breaking efficiency, reduces the frequency of PDC drill bit replacement, and thus saves drilling costs.

[0030] In some embodiments, the angle between the first cutting surface 231 and the cutting surface 22 is between 120° and 170°; the angle between the second cutting surface 232 and the cutting surface 22 is between 120° and 170°. Controlling the angles between the first cutting surface 231 and the second cutting surface 232 and the cutting surface 22 within the aforementioned range can improve the sharpness of the primary cutting edge while ensuring its structural strength. Compared to conventional single-tooth PDC structures, under the same rock formation properties, bit pressure, and drilling speed, the tangential force required to break a certain volume of rock formation is smaller, and the drill bit torque required is also lower, resulting in far superior rock breaking difficulty and efficiency compared to conventional single-tooth PDC structures.

[0031] In some embodiments, the first cutting surface 231 and the second cutting surface 232 are symmetrically arranged relative to the intersecting ridge 233, so that the rock breaking ability of the composite piece on both sides of the blade remains consistent, and the overall force is uniform, thereby optimizing the force of the composite piece on the drill bit matrix. Combined with the multi-blade structure, the drilling efficiency and rock breaking efficiency are greatly improved, the frequency of replacing the PDC drill bit is reduced, and thus the drilling cost is saved.

[0032] Specifically, the first cutting surface 231 and the second cutting surface 232 have the same included angle with the cutting surface 22 , so that the rock breaking ability of the composite piece on both sides of the blade remains consistent and the overall force is uniform.

[0033] In some embodiments, the intersecting ridges are straight or curved; the curved intersecting ridges are concave or convex relative to the bottom surface of the multi-blade polycrystalline diamond compact. By adjusting the shape of the curved intersecting ridges, different forces acting on the compact and the rock can be achieved, allowing selection based on actual needs. Furthermore, because the first and second cutting surfaces on either side of the intersecting ridges are symmetrically positioned relative to the intersecting ridges, the rock-breaking capacity of the compact can be maintained consistent on both sides of the blade, ensuring uniform overall force distribution.

[0034] In some embodiments, the angle between the ridge line of the straight intersecting ridges or the tangent line of the arc intersecting ridges and the horizontal plane is between -8° and 8°, which can make the composite sheet have strong cutting ability, high drilling efficiency and long service life.

[0035] In some embodiments, the central portion is a planar structure, a concave structure, or a convex structure. With such a central portion, the composite sheet has better impact resistance.

[0036] In some embodiments, relative to a horizontal plane, an end of the cut surface close to the center portion is higher than an end close to an edge of the polycrystalline diamond layer.

[0037] In some embodiments, the angle between the cut surface and the horizontal plane is 15° to 45°. The cut surface at this angle facilitates chip removal, increases the heat dissipation area, improves the heat resistance of the composite sheet, and ensures the cutting ability and service life of the composite sheet.

[0038] In some embodiments, the polycrystalline diamond layer has a first surface in contact with the cemented carbide substrate and a second surface opposite the first surface, both of which are curved. The polycrystalline diamond layer may or may not have a chamfer. The cross-sectional profile of the blade is arc-shaped or angular. This structural design improves the sharpness of the main cutting edge while maintaining its structural strength. Compared to a conventional single-tooth PDC structure, under the same rock formation properties, bit pressure, and drilling speed, the tangential force required to break a certain volume of rock formation is smaller, and the drill bit torque required is also lower. The rock breaking difficulty and efficiency are far superior to conventional single-tooth PDC structures.

[0039] The present invention will be described in detail with reference to the following examples. It should also be understood that the following examples are only intended to further illustrate the present invention and are not to be construed as limiting the scope of protection of the present invention. Any non-essential improvements and adjustments made by those skilled in the art based on the above disclosure of the present invention fall within the scope of protection of the present invention.

[0040] Example 1

[0041] This embodiment provides a high impact resistant three-edged polycrystalline diamond composite sheet, which is selected from a high impact resistant three-edged polycrystalline diamond composite sheet with an outer diameter of 15.88 mm and a total height of 13.20 mm. Figure 1 As shown, the central part is a plane, the number of blades is 3, the angle between the cutting surface extending outward from the central part and the horizontal plane is 35°, the angle formed by the first cutting surface and the second cutting surface is 160°, and the angle between the ridge line and the bottom surface of the multi-blade polycrystalline diamond composite sheet is -8°.

[0042] A rock breaking test comparison experiment was conducted on a high impact resistant three-blade polycrystalline diamond compact and a flat-tooth polycrystalline diamond compact with the same substrate. The high impact resistant three-blade polycrystalline diamond compact of this embodiment showed more excellent performance.

[0043] Example 2

[0044] This embodiment provides a high impact resistant four-edged polycrystalline diamond composite sheet, which is selected from a high impact resistant four-edged polycrystalline diamond composite sheet with an outer diameter of 13.44 mm and a total height of 13.20 mm. Figure 2 As shown, the central part is concave, the number of blades is 4, the angle between the cutting surface extending outward from the central part and the horizontal plane is 15°, the angle formed by the first cutting surface and the second cutting surface is 170°, and the angle between the ridge line and the bottom surface of the multi-blade polycrystalline diamond composite sheet is 8°.

[0045] A rock breaking test was conducted to compare the high-impact resistant four-blade polycrystalline diamond composite sheet with the flat-tooth polycrystalline diamond composite sheet based on the same substrate. The high-impact resistant four-blade polycrystalline diamond composite sheet showed better performance.

[0046] In summary, the utility model provides a high-impact-resistant multi-blade polycrystalline diamond composite sheet, comprising a cemented carbide substrate and a polycrystalline diamond layer located at one end of the cemented carbide substrate; the polycrystalline diamond layer comprises a central portion located at a central position, a cut surface formed by extending from the edge of the central portion to the edge of the polycrystalline diamond layer, and a plurality of blades located on the cut surface; the blade comprises a first cutting surface, a second cutting surface, and an intersecting ridge formed by the intersection of the first cutting surface and the second cutting surface. The utility model provides a plurality of blades on the cut surface extending outward from the central portion of the polycrystalline diamond layer, and the blade comprises a first cutting surface, a second cutting surface, and an intersecting ridge formed by the intersection of the first cutting surface and the second cutting surface. This arrangement enables the composite sheet to maintain consistent rock-breaking capabilities on both sides of the blade, uniformly bears overall force, and thereby optimizes the force on the composite sheet on the drill bit matrix. The multi-blade arrangement greatly improves drilling efficiency and rock-breaking efficiency, reduces the frequency of replacing PDC drill bits, and thus saves drilling costs. In addition, the multi-edge teeth provided by the present invention can buffer the impact from rocks in heterogeneous formations, reduce damage and increase the service life of the PDC drill bit, thereby increasing the drilling distance of the PDC drill bit and reducing drilling costs.

[0047] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, they can make improvements or changes based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A high impact resistant multi-edged polycrystalline diamond composite sheet, characterized in that: It comprises a cemented carbide substrate and a polycrystalline diamond layer located at one end of the cemented carbide substrate; The polycrystalline diamond layer includes a central portion located at a central position, a cutting surface formed by extending from the edge of the central portion to the edge of the polycrystalline diamond layer, and a plurality of blades located on the cutting surface; the blade includes a first cutting surface, a second cutting surface, and an intersecting ridge formed by the intersection of the first cutting surface and the second cutting surface.

2. The high impact resistant multi-edge polycrystalline diamond compact according to claim 1, characterized in that: The number n of the blades is 2≤n≤5, and the blades are evenly distributed along the outer circumference of the polycrystalline diamond layer at 360° / n.

3. The high impact resistant multi-edge polycrystalline diamond compact according to claim 1, characterized in that: The included angle between the first cutting surface and the cutting surface is between 120° and 170°; the included angle between the second cutting surface and the cutting surface is between 120° and 170°.

4. The high impact resistant multi-edge polycrystalline diamond compact according to claim 1, characterized in that: The first cutting surface and the second cutting surface are symmetrically arranged with respect to the intersecting ridge.

5. The high impact resistant multi-edge polycrystalline diamond compact according to claim 1, characterized in that: The intersecting ridges are straight intersecting ridges or arcuate intersecting ridges; the arcuate intersecting ridges are concave downward or convex upward relative to the bottom surface of the multi-edged polycrystalline diamond compact.

6. The high impact resistant multi-edge polycrystalline diamond compact according to claim 5, characterized in that: The angle between the ridge line of the straight-line intersecting ridge or the tangent line of the arc-line intersecting ridge and the horizontal plane is between -8° and 8°.

7. The high impact resistant multi-edge polycrystalline diamond compact according to claim 1, characterized in that: The central portion is a planar structure, a concave structure or a convex structure.

8. The high impact resistant multi-edge polycrystalline diamond compact according to claim 1, characterized in that: With respect to a horizontal plane, an end of the cut surface close to the center portion is higher than an end close to the edge of the polycrystalline diamond layer.

9. The high impact resistant multi-edge polycrystalline diamond compact according to claim 8, characterized in that: The included angle between the section and the horizontal plane is 15° to 45°.

10. The high impact resistant multi-edge polycrystalline diamond compact according to claim 1, characterized in that: The polycrystalline diamond layer has a first surface in contact with the cemented carbide substrate and a second surface opposite to the first surface, and the first surface and the second surface are both curved structures; the polycrystalline diamond layer is provided with chamfers or has no chamfers; the cross-sectional profile of the blade is arc-shaped or angular.

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