Double-bearing simply supported beam type rock breaking hob and mixed PDC drill bit thereof

Abstract

The invention relates to a double-bearing simply supported beam type rock breaking hob and a mixed PDC drill bit thereof.The rock breaking hob comprises a spherical body, a through hole for a supporting shaft to penetrate through is formed in the center of the body, multiple rock breaking elements are arranged on the outer edge of the body, and the two ends of the supporting shaft are supported at the two ends of the through hole of the rock breaking hob through bearings respectively and penetrate out; the mixed PDC drill bit comprises a drill bit body, and multiple pairs of blades are distributed at the front end of the drill bit body, and rock breaking hobs are arranged between the blades or at the crown portions of the blades.Therefore, the supporting shaft has the function of a simply supported beam during work and bears shear force and torque of the rock breaking hobs during work, in this way, defects in the prior art are overcome, the advantage of breaking rock through fracturing of the rock breaking hob and the advantage of breaking rock through cutting of the PDC drill bit are effectively combined, and rock is fractured and cut at the same time, so that the drill bit has adaptability to diversity of a stratum in exploiting operation, drilling speed and efficiency are improved, and the service life of the drill bit is effectively prolonged.

Description

technical field [0001] The present invention relates to the technical field of drilling and exploration tools, in particular to a double-bearing simply supported beam rock-breaking hob and a hybrid PDC drill bit, the structure of which is combined with the rock-breaking hob to break rock, and uses the principle of rotary cutting of the PDC drill bit composite sheet , combining the advantages of the two drill bits to achieve complementary improvements and form a new, easy-to-manufacture hybrid drill bit. Background technique [0002] PDC bits are widely used in geological exploration, coal field drilling, oil exploration and other fields. In recent years, the accident rate of PDC bits is low and the drilling speed is fast. When some special and complex formations are encountered during mining, such as interlayer gravel and rubber formations, the PDC composite sheet is prone to non-shock resistance during drilling, or the formation cannot be effectively penetrated, or the comp...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a double-bearing simply supported beam rock-breaking hob and its hybrid PDC drill bit, which overcomes the difficulties of the PDC diamond composite drill bit in drilling operations when drilling through complex interlayer formations, gravel formations, rubber formations, etc. , or during directional operations, the life of the PDC composite sheet is insufficient and there is early damage, or it cannot effectively penetrate into the rock formation, and the turtle drill jumps during the operation. The advantages of rock-breaking hob fracturing rock and PDC bit cutting rock-breaking advantages, crushing and cutting rocks at the same time, so as to achieve the various adaptability of the drill bit to the formation in the mining operation, and also improve the drilling speed and efficiency, effectively Extended bit life

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