Non-planar polycrystalline diamond composite piece and drill bit for oil drilling

Abstract

The invention belongs to the technical field of super-hard composite materials, and mainly relates to the engineering equipment for oil drilling, mine tunnelling and the like, in particular to a non-planar polycrystalline diamond composite piece and a drill bit for the oil drilling. The non-planar polycrystalline diamond composite piece comprises a polycrystalline diamond layer and a hard alloy substrate which wraps the bottom of the polycrystalline diamond layer; the top surface which is exposed to the outside of the polycrystalline diamond layer at least consists of two surface structures; the surface structures and the circumferential outer edge surface of the polycrystalline diamond layer form a plurality of cutting edges which are distributed on the circumferential outer edge surfaceof the polycrystalline diamond layer in the circumferential direction; the cutting edges are arranged in the manner of extending in the radial direction of the polycrystalline diamond layer; and non-horizontal planar structures which extend integrally are distributed on the polycrystalline diamond layer on the two sides of at least one cutting edge and the hard alloy substrate. The non-planar polycrystalline diamond composite piece and the drill bit for oil drilling are unique in appearances; the service life of the drill bit can be effectively prolonged; the feeding capacity and the drillingefficiency of the drill bit in extremely hard and plastic formation with difficulty in drilling are improved; and the drilling cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of superhard composite materials, and mainly relates to engineering equipment such as oil drilling and mine excavation, in particular to a non-planar polycrystalline diamond composite sheet and a drill bit for oil drilling. Background technique [0002] Polycrystalline diamond compact (PDC) is sintered by polycrystalline diamond powder and cemented carbide matrix under high temperature and high pressure environment. Its advent has become an important milestone in the history of polycrystalline diamond application technology development. At present, PDC is widely used in petroleum and natural gas drilling and other fields as a super wear-resistant cutting element. [0003] With the innovation and development of exploration concepts, unconventional oil and gas exploration has achieved rapid development. The bit design and PDC performance used in deep and complex formations need to be continuously improved, esp...

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Problems solved by technology

[0003] With the innovation and development of exploration concepts, unconventional oil and gas exploration has achieved rapid development. The bit design and PDC performance used in deep and complex formations need to be continuously improved, especially when drilling into extremely hard, plastic and other difficult formations. Eating and waiting, there will be problems such as slow drilling, or even drill sticking

[0004] In view of the above-mentioned extremely difficult drilling formations, the application numbers 201520471001.4, 201720243420.1, and 201721524171.X all provide a special-shaped tooth with a curved surface structure that overcomes hard formations such as difficult drilling and chip removal. The penetration ability and drilling efficiency of the formation are still lacking

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