PDC (Polycrystalline diamond compact)-impregnated segment hybrid self-adaptive drill bit

Abstract

The invention discloses a PDC (polycrystalline diamond compact)-impregnated segment hybrid self-adaptive drill bit, consisting of a steel matrix, a plurality of self-adaptive elements and a plurality of PDC tooth-impregnated segment hybrid cutter wings, wherein the PDC tooth-impregnated segment hybrid cutter wings are fixedly arranged on the steel matrix by pin shafts, and the plurality of self-adaptive elements are respectively and fixedly arranged between the steel matrix and the PDC tooth-impregnated segment hybrid cutter wings; when the PDC-impregnated segment hybrid self-adaptive drill bit is used for drilling soft to medium hard formations, a PDC drill bit plays a main role of cutting; when the PDC-impregnated segment hybrid self-adaptive drill bit is used for drilling a hard formation, a diamond-impregnated bit plays a main role of crushing rocks; therefore, the adaptation of the drill bit to the formations is greatly improved, the characteristic of efficiently crushing the rocks of the drill bit is also maintained, and the drill bit replacement times are reduced. The PDC-impregnated segment hybrid self-adaptive drill bit is simple in structure, is provided with the conveniently-disassembled cutter wings, and integrates the advantages of the PDC drill bit and the diamond-impregnated bit, thus greatly improving the adaptation of the drill bit to the formations, and being not only capable of maintaining the drill bit to efficiently crush the rocks, but also reducing the impact and damage of the formations to PDC teeth.

Description

technical field [0001] The invention relates to a drill bit in the field of drilling, in particular to a PDC-impregnated block hybrid self-adaptive drill bit. Background technique [0002] PDC bit and impregnated diamond bit are two main rock breaking tools, which are widely used. The back rake angle of PDC bit has a significant impact on drilling speed and bit life. When drilling into soft formations, the smaller the angle, the better the mechanical drilling efficiency. When drilling into hard formations, the back rake angle is increased appropriately, which is beneficial to reduce the frontal impact force of rock impact on PDC teeth and improve the life of the drill bit. In general, the PDC bit has a good ROP in soft to medium hard rock formations, but in hard to hard formations, highly abrasive formations, soft and hard interlayers, gravel interlayers, and broken rock formations, the PDC teeth are prone to collapse, Fracture, the life of the drill bit and the ROP have dr...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the above-mentioned problem that the existing PDC bit has poor adaptability to formations, especially in complex formations such as drilling hard to hard formations, highly abrasive formations, soft and hard interlayers, gravel interlayers, and broken rock formations. However, the PDC bit is prone to problems such as cutter breakage, delamination and other unconventional wear phenomena, and a PDC-impregnated block hybrid self-adaptive drill bit is provided.

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