Polycrystalline diamond compact sheet and PDC bit

Abstract

The invention provides a polycrystalline diamond compact sheet and a PDC bit. The polycrystalline diamond compact sheet comprises a hard alloy base and a diamond layer, wherein one side of the diamondlayer is connected to a first side of the hard alloy base; crossed cutting protrusions are formed on the side surface, away from the hard alloy base, of the diamond layer in a protruding manner; thewidth of each cutting protrusion is gradually reduced from the center of the diamond layer to the outer edge; a cutting face that is oblique relative to a radial plane of the diamond layer is formed between every two adjacent cutting protrusions; and the cutting faces are gradually inclined from the center of the diamond layer to the outer edge. Owing to four-quadrant synthetic polycrystalline diamond teeth distributed on the PDC bit, the PDC bit is easy to penetrate the stratum, such that the rock breaking efficiency is high, the mechanical drilling speed is effectively improved, and bit balling is reduced. When the bit is subject to a lateral force, a better rock breaking effect can be achieved and a tool face can be stably oriented. Thus, better abrasiveness and impact resistance are realized.

Description

technical field [0001] The invention belongs to the technical field of manufacturing PDC geological drill bits, and in particular relates to a polycrystalline diamond composite sheet and a PDC drill bit. Background technique [0002] At present, the conventional PDC drill bit (polycrystalline diamond compact bit, polycrystalline diamond compact bit) uses a conventional cylindrical shape design for the teeth, the thickness of the diamond layer is 2.0mm, and a cemented carbide substrate. The cutting surface of the diamond layer is flat , the circular profile has specific chamfering requirements. The cutter is the cutting edge of the PDC bit for rock breaking, and its performance determines the use effect of the PDC bit. Good cutter performance can improve the ROP and footage of the PDC bit, shorten the well construction period, and reduce the overall cost of drilling. [0003] The existing technology has no structural design for the cutting surface of the diamond layer. When...

AI Technical Summary

Problems solved by technology

However, in the application of hard formations with high compressive strength, it is more difficult for conventional cutters to drill into formations. The breakage of cutting teeth restricts the application of PDC bit in hard formation

[0004] In addition, in the application of directional drilling, the working mechanism of conventional cutting teeth to scrape and break rock makes the PDC bit bear higher reaction torque, which easily leads to the instability of the directional deflection tool face, which affects the application effect of the PDC bit in directional drilling

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