Suction type micro core drilling bit

Abstract

The invention discloses a suction type drill bit for micro core taking drilling, and belongs to the field of a drilling machine tool. The suction type drill bit comprises a drill bit body and a cutter wing, wherein the middle part of the end part of the drill bit body is provided with a core taking hole; at least one core discharging passage communicated with the core taking hole is arranged at the upper part of the core taking hole in the drill bit body; the core discharging passage is provided with a core discharging outlet; at least one spraying passage communicated with the core discharging passage is also arranged in the drill bit body, and is communicated with a drill bit inner flow passage; the outlet direction of the spraying passage is along the flowing direction of the core discharging passage; an included angle formed by an outlet flowing direction line of the spraying passage and the flowing direction line of the core discharging passage is an obtuse angle or a straight angle. The drill bit for core taking drilling has the advantages that the active core suction and smooth core feeding and core discharging can be realized; the conditions that micro rock core bodies are difficult to convey out from the center of the drill bit and are extruded and pressed, and damage can occur when the micro rock cores are collided and extruded in the process of flowing through the drill bit crown surface are avoided; the rock core quality and the harvesting rate are favorably improved.

Description

Technical field [0001] The invention relates to the field of drilling tools, in particular to a suction type micro-core drilling bit. Background technique [0002] In petroleum and geological exploration, in order to understand the geological conditions of the formation, it is necessary to sample the drilled formation to determine the mineral composition in the formation and the geological analysis of the formation rock property parameters. The quality and harvest rate of core samples will directly affect the accuracy of geological analysis. [0003] Patent documents with publication numbers CN 203114180 U and CN 203499567 U respectively disclose a micro-core drill bit and a self-disconnecting micro-core drill bit. The core of the two patent documents is provided with an open core groove, which is directly connected with the cuttings discharge groove between the blades of the bit, and the core column formed from the core is broken during the drilling of the bit Later, the drillin...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a suction type micro-coring drilling bit to solve the problems of poor coring quality and low yield of existing micro-coring bits

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