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Impact-resistant multi-cutting-edge diamond compact

A technology of diamond composite sheet and cutting edge, which is used in earth-moving drilling, drill bits, drilling equipment, etc., can solve the problems of tooth chipping failure, different impact resistance, single circumferential chamfer structure, etc., and achieve good side impact resistance. capacity, extended service life, and the effect of increasing the rate of penetration

Pending Publication Date: 2022-05-31
KINGDREAM PLC CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The diamond composite sheet is composed of a cylindrical cemented carbide matrix and a diamond composite layer. The edge of the diamond composite layer is chamfered to form the cutting edge of the composite sheet. During the drilling process of the diamond bit, different areas drill different formations. The aggressiveness of the composite sheet is different from the impact resistance. In the drilling process of some gravel formations, the normal cutting surface of the diamond composite sheet often wears and tear, and the tooth chipping failure on the side is more serious, which leads to the overall failure of the drill bit composite sheet.
From these phenomena, it can be seen that the impact resistance required for the cutting surface and the side of the diamond composite sheet is different, and the existing chamfering of the cutting edge of the composite sheet is a single circumferential chamfering structure, which is difficult to adapt to drilling in complex formations need

Method used

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  • Impact-resistant multi-cutting-edge diamond compact
  • Impact-resistant multi-cutting-edge diamond compact
  • Impact-resistant multi-cutting-edge diamond compact

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example as Figure 1 to Figure 3 As shown, it includes a columnar cemented carbide substrate 102 and a diamond composite layer 101. The diamond composite layer is arranged at one end of the cemented carbide substrate. The described diamond composite layer is a polycrystalline diamond composite layer, and the diamond composite layer and hard The solid alloy matrix is ​​connected into one body through ultra-high temperature and high pressure sintering, the end 108 of the diamond composite layer is a plane, and four chamfers 103, 104, 105, 106 are set on the edge of the end face of the diamond composite layer, of which two chamfers 103 105 and 105 have the same structure, which is a 45-degree bevel chamfer with an axial height of 0.3mm. 104 and 106 have the same structure, which is a 45-degree bevel chamfer with an axial height of 1 mm. The central angle corresponding to each chamfer occupies 120° (2Л / 3), forming an impact-resistant cutting edge. A diversion cavity 107 is ...

Embodiment 2

[0028] Example two such as Figure 4 to Figure 6 As shown, the difference between it and Embodiment 1 is that the two chamfers 203 and 205 have the same structure, which is a bevel chamfer with an axial height of 0.8mm and an included angle α of 22.5°, and the corresponding central angle of each chamfer Each occupies 60°(Л / 3), forming an aggressive cutting edge. The other two chamfers 204 and 206 have the same structure, which is a bevel chamfer with an axial height of 1mm and an included angle β of 45 degrees. Each chamfer The corresponding central angles each occupy 120° (2Л / 3), forming an impact-resistant cutting edge. Other structures including the structure of the guide chamber 207 are the same as those in the first embodiment.

Embodiment 3

[0029] Embodiment three such as Figure 7 to Figure 9 As shown, the difference between it and the second embodiment is that the two chamfers 303, 305 have the same structure, the axial height of the inner bevel chamfer is 0.8mm, and the included angle θ is 20°, and the axial height of the outer bevel chamfer The height is 0.2mm, and the angle δ is 45 degrees. The central angle of each chamfer is 60°(Л / 3), forming an aggressive cutting edge. Other structures including the structure of the other two chamfers 304 and 306 and the structure of the guide cavity 307 are the same as those in the second embodiment.

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Abstract

The invention relates to an impact-resistant multi-cutting-edge diamond compact which comprises a cylindrical hard alloy matrix and a diamond composite layer, the diamond composite layer is arranged at one end of the hard alloy matrix, the diamond composite layer and the hard alloy matrix are connected into a whole, and the impact-resistant multi-cutting-edge diamond compact is characterized in that two or more different chamfers are arranged on the edge of the end face of the diamond composite layer. At least one high-aggressiveness cutting edge exists, impact-resistant cutting edges are arranged on the two sides of the high-aggressiveness cutting edge, and a flow guide cavity is formed in the middle of the end face of the diamond composite layer. Different edges of the same composite sheet have different attack capacities and impact resistance capacities, the high-attack cutting edges have high cutting efficiency, and the two sides of the high-attack cutting edges have high lateral impact resistance capacity, so that the composite sheet has good cutting performance and side impact resistance capacity in a gravel stratum, and the service life of the composite sheet is prolonged.

Description

technical field [0001] The invention relates to an impact-resistant multi-cutting edge diamond composite sheet, which is used as a cutting element of a diamond drill bit and belongs to the technical field of petroleum drilling tools. Background technique [0002] Since the 1980s, diamond drill bits have been widely used in oil and gas drilling projects. Diamond drills are mainly composed of drill bodies and cutting elements. Diamond drills are divided into three categories according to cutting elements: PDC (polycrystalline diamond) drills, TSP (thermally stable polycrystalline diamond) drills and natural diamond drills. PDC bits are mainly used for drilling in soft to medium-hard formations. After continuous technological progress, the scope of application of PDC bits is getting wider and wider, and they have better economic value. TSP bits are mainly used for drilling in medium-hard to extremely hard formations. At present, deep well operations in oil and gas drilling pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/46
CPCE21B10/46
Inventor 涂关富杨霞徐昉
Owner KINGDREAM PLC CO