Coal mine underground horizontal drilling coring drilling tool combination and using method thereof

Abstract

The invention discloses a coal mine underground horizontal drilling coring drilling tool combination and a using method thereof, and belongs to the technical field of coal mine drilling coring. The problems that through an adit hydraulic reverse-circulation coring method, an annular gap of a direct-circulation channel is small, and the complex situation in a hole cannot be treated through a flushing medium direct-circulation method can be solved. The coal mine underground horizontal drilling coring drilling tool combination comprises a drilling tool I and a drilling tool II, when tripping-in is started, the drilling tool I is tripped in, continuous coring is implemented through a hydraulic reverse-circulation drilling technology, when rock core carrying columns are blocked during hydraulicreverse-circulation, a reverse-circulation tap is demounted, and a pup joint II, a single-wall drill pipe and a tap are additionally connected, so that the drilling tool I is converted into the drilling tool II, a double-wall drill pipe serves as a coring long barrel, and a direct-circulation drilling technology is used for continuing conducting coring drilling. Hydraulic reverse-circulation coring drilling and direct-circulation coring drilling can be achieved in one trip, the average roundtrip footage of coring drilling is increased, and the overall construction efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of coal mine drilling and coring, and in particular relates to a coal mine underground horizontal drilling coring drilling tool assembly and a use method thereof. Background technique [0002] Tunnel coring drilling is mainly based on horizontal drilling, and there are three main methods: single-pipe (or double-pipe) lifting drill coring, rope coring, and hydraulic reverse circulation coring. Compared with the single-pipe (or double-pipe) drill-lifting coring method in general, the tunnel hydraulic reverse circulation coring method has achieved better results in terms of average footage per return and drilling cost. Therefore, in In my country's iron ore, copper ore, and gold mine tunnel drilling projects, it has been widely popularized and applied. [0003] In the process of hydraulic reverse circulation core drilling in tunnels, in order to ensure the continuity and stability of the reverse circulation eff...

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Problems solved by technology

[0005] The present invention aims at the problem that the tunnel hydraulic reverse circulation coring method has a small circular gap in the positive circulation channel, and the complex situation in the hole cannot be processed by the flushing medium positive circulation method, and provides a coal mine underground horizontal drilling coring drilling tool assembly and how to use it

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