High efficiency coring method for portable drilling machine in integral hard rock

Abstract

The invention relates to a high efficiency coring method for a portable drilling machine in an integral hard rock. The invention solves the technical difficult problems of high wear speed of a drilling tool and low coring rate which are caused by the case that when the portable drilling machine drills in the hard rock with high integrity, the root of a rock core is usually difficult to cut off or is difficult to successfully take out after being cut off. The invention adopts the scheme that the high efficiency coring method comprises the following steps: a, on a superficial layer of the earth surface, where a rock core to be taken is positioned, drilling a blind hole by the drilling machine and clearing away the broken rock core in the blind hole; b, lengthening a drill rod on the drilling machine in the step a and continuously drilling towards the lower layer on the basis of the blind hole; c, lifting up the drilling machine in the step b to form a gap between the inner wall of a hollow drill bit and the rock core; d, filling a filler in the gap in the step c; e, starting the drilling machine to enable the root of the rock core to be broken, shutting down the drilling machine and taking out the drill rod and the hollow drill bit; f, placing in-hole positioning imaging equipment into the blind hole to carry out positioning and recording on a damaged and cracked position of the rock core in the blind hole; g, taking out the in-hole positioning imaging equipment in the blind hole; h, placing deep hole rock core extracting equipment into the blind hole and taking out a rock core sample.

Description

technical field [0001] The invention relates to a high-efficiency coring technology for portable drilling rigs in complete hard rocks, which is a simple and fast coring method for drilling holes in hard rocks with a high degree of integrity. Fast access to full-hole cores in hard rock. The present invention is also applicable to the rapid resolution of the difficult problem of drill sticking in the deep part often encountered when the portable drilling rig drills from shallow to deep. Background technique [0002] Most of the cores required for rock mechanics and hydraulics research are drilled by drilling rigs. Generally, low-integrity and low-strength cores can be pulled out under the joint action of drilling tool torsional force and tight binding force; while cores with higher integrity Hard rocks such as granite and andesite, because of their tightly connected particles and high compressive and shear strength, it is difficult for conventional drilling rigs to break and ...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: Aiming at the difficult problem that the root of the rock core is difficult to cut off or taken out smoothly after being cut off when the portable drilling rig is drilling in the hard rock with high integrity, resulting in fast wear of the drill bit and low core removal rate, The present invention provides a method and means for fast casing after effectively cutting off the connection between the core and the parent rock during the drilling process of complete hard rock

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