Internal chip removal drill combined with pdc and single cone

Abstract

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. The internal chip removal drill bit includes a single cone bit and a PDC drill bit with a main body. The height direction of the main body has a main flow channel and an inner chip removal channel. The inner chip removal channel includes a first flow channel, a second flow channel and a top of the main body. Facing the downwardly extending upper flow channel, the first flow channel extends downward from the upper flow channel to the main channel and is set to reversely discharge the initial drilling fluid in the main channel to form a reverse pressure difference, and the second flow channel extends from the upper flow channel to the main channel. Extending down to the bottom surface of the main body and set to be able to extract the cuttings-carrying drilling fluid at the bottom surface of the main body under the pressure difference of the first flow channel, the single-cone bit is installed at the bottom of the main flow channel and is set to be able to break rock together with the PDC bit . The PDC and single-cone composite internal chip removal bit is jointly formed by the single-cone bit and the PDC bit, so that the PDC bit and the single-cone bit simultaneously break rocks and improve drilling efficiency.

Description

technical field [0001] The invention relates to the technical field of drilling tools, in particular to an internal chip removal drill bit which is combined with a PDC and a single cone. Background technique [0002] Drill bits are an indispensable tool for downhole operations 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 is supplemented by the ploughing 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 cutters to the rock in the center of the wellbore is low. Increased operating costs during drilling. SUMMARY OF THE INVENTION [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 i...

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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