A kind of drilling tool assembly for horizontal drilling and coring in underground coal mine and its application method

Abstract

A coal mine underground horizontal drilling coring drilling tool assembly and its use method belong to the technical field of coal mine drilling and coring, which can solve the problem of the small circular gap of the positive circulation channel in the tunnel hydraulic reverse circulation coring method, and the positive circulation cannot be passed through the flushing medium The method is to deal with the complex situation in the hole, including drilling tool I and drilling tool II. When the drilling starts, the drilling tool I is lowered, and the hydraulic reverse circulation drilling process is used to implement continuous coring, and the hydraulic reverse circulation carries the core column. When it is not smooth, remove the reverse circulation faucet, add the short joint II, single-wall drill pipe and faucet, so that the drilling tool I is converted into the drilling tool II, and the double-wall drill pipe is used as a long core barrel, and the positive circulation drilling is used instead. The process continues with core drilling. The present invention can realize hydraulic reverse circulation coring drilling and positive circulation coring drilling in one pass of drilling, and improve the average footage and overall construction efficiency of coring drilling.

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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