Combined cutting PDC drill bit with spin-tunneling tooth structure

Abstract

The invention discloses a combined cutting PDC drill bit with a spin-tunneling tooth structure. The combined cutting PDC drill bit at least comprises a drill bit body and a passive spin-cutting structure, wherein the drill bit body is provided with multiple blades for rock breaking; multiple PDC cutting teeth are arranged on the blades of the drill bit to cut and break the strata rock; the drill bit body is also provided with a hydraulic power structure composed of an external flow channel, a nozzle and the like; the passive spin-cutting structure comprises a cutting element, a spin base bodyfor mounting the cutting element, a support seat which is used for assembling the spin base body and is fixed on the drill bit body, a locking structure for preventing the spin base body from fallingoff, etc. Therefore, the combined cutting PDC drill bit disclosed by the invention can realize the effects of pre-slotting and pre-breaking of bottom hole rock; internal stress of the rock is releasedin advance, so that the PDC cutting teeth of the drill bit quickly and effectively penetrate and cut the rock; and moreover, through the spinning motion, the impact load on the drill bit can be effectively buffered, the whole service life of the drill bit is prolonged, and the mechanical drilling speed of the drill bit is increased.

Description

technical field [0001] The invention relates to the technical field of drilling exploration tools, in particular to a composite cutting PDC drill bit with a spin driving tooth structure. Background technique [0002] Generally, the PDC bit used for oil and gas drilling is mainly composed of a bit body, a cutting structure, and a hydraulic structure. PDC cutters arranged in position and working angle constitute. When the drill bit is working at the bottom of the well, the formation rock is broken into cuttings under the pressure-shearing action of the cutting teeth. At the same time, the drilling fluid flows out through the hydraulic structure to clean and cool the bottom of the well and the cutting teeth, and bring the cuttings to the ring. null. [0003] Under normal circumstances, PDC drill bits rarely encounter homogeneous and single rock formations when working at the bottom of the well. Due to different geological formation conditions, they will always encounter rock ...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a compound cutting PDC drill bit with a spin-driving tooth structure, which has structural features that improve the shortcomings of the prior art, and can overcome the difficulty of drilling in gravel layers and hard plastic formations that are often encountered in drilling. The problems of low efficiency and slow mechanical drilling speed caused by failure

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