PDC and mono-cone composite inner chip removal drill bit

Abstract

The invention relates to the technical field of drilling tools, in particular to a PDC and mono-cone composite inner chip removal drill bit. The inner chip removal drill bit comprises a mono-cone bitand a PDC drill bit with a main body, a main flow channel and an inner chip removal channel are formed in the height direction of the main body, the inner chip removal channel comprises a first flow channel body, a second flow channel body and an upper flow channel body extending downwards from the top face of the main body, the first flow channel body extends downwards to the main flow channel from the upper flow channel body and is arranged to be capable of reversely discharging initial drilling fluid of the main flow channel to form reverse pressure difference, the second flow channel bodyextends downwards to the bottom face of the main body from the upper flow channel body and is arranged to be capable of extracting chip-carrying drilling fluid on the bottom face of the main body under the pressure difference effect of the first flow channel body, and the mono-cone drill bit is mounted at the bottom of the main flow channel and is arranged to be capable of breaking rocks togetherwith the PDC drill bit. The PDC and mono-cone composite inner chip removal drill bit is jointly formed by the mono-cone bit and the PDC drill bit, so that the PDC drill bit and the mono-cone bit conduct rock breaking operation at the same time, and the operation efficiency of well drilling is improved.

Description

technical field [0001] The invention relates to the technical field of drilling tools, in particular to an internal chip removal drill bit combined with a PDC and a single cone. Background technique [0002] The drill bit is an indispensable downhole operation tool in the process of oil and gas extraction. At present, the commonly used drill bit is the PDC bit. The PDC bit mainly relies on the shearing action of the cutting teeth on the rock during the rock breaking process, and at the same time, it is supplemented by the plowing action, making full use of the low shear strength of the rock. [0003] When the conventional PDC bit is drilling, affected by the structure of the PDC bit itself, the cutting speed of the cutting teeth on the rock in the center of the borehole is low, and this part of the rock is basically broken or crushed by the bit, which limits the ROP of the PDC bit, significantly Increased operating costs during drilling. Contents of the invention [0004...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of low cutting speed and high operating cost of the PDC drill bit in the prior art, and provide an internal chip removal drill combined with a PDC and a single cone. The drill bit is jointly formed by the single-cone bit and the PDC bit, so that the PDC bit and the single-cone bit can break rock at the same time, and overcome the defect of low rock-breaking efficiency in the center of the existing single PDC bit. Drilling speed is faster with internal chip removal drill combined with single cone

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