Unmanned gas extraction method by hydraulic perforation

Abstract

The invention provides an unmanned gas extraction method by hydraulic perforation. The gas extraction method comprises the following steps: firstly perforating is performed at a center line of a coalbody in a forward direction of a coal roadway driving face to form a high-pressure hydraulic perforation by utilizing a high-pressure hydraulic perforating gun, and then fracturing is performed in thecoal body around the high-pressure hydraulic perforation by utilizing a high-pressure hydraulic fracturing gun, so that a high-pressure hydraulic fracture hole with cracks is obtained, and the high-pressure hydraulic fracture hole acts as an outflow passage for gas in the coal body, and then a gas safety isolation air bag and a gas extraction pipe are arranged in the rear roadway of the coal body, the gas extraction pipe runs through the gas safety isolation air bag to the interior of the high-pressure hydraulic fracture hole, and the gas is extracted through the gas extraction pipe; with theadoption of the gas extraction system provided by the invention, the working efficiency in the process of roadway driving and rock cross-cut coal uncovering is improved, the safety of construction personnel is ensured, and the gas in the coal body in front of the driving face and in front of the rock cross-cut coal uncovering can be extracted safely, efficiently and quickly.

Description

technical field [0001] The invention belongs to the technical field of coal mine gas control, and relates to a gas extraction method, in particular to a hydraulic perforation unmanned gas extraction method. Background technique [0002] At present, mines with the danger of coal and gas outburst occupy a large proportion of the key coal mines in my country. Coal and gas outburst has the characteristics of suddenness, intensity, and complex dynamics. It is thrown to the working face or up and down along the trough in a very short time, accompanied by a strong sound, which seriously threatens the safe production of coal mines. [0003] In recent years, with the improvement of coal mining technical conditions, methods such as enhanced ventilation, ground pre-drainage, hydraulic fracturing and other methods are mainly used to reduce the threat of coal and gas outburst to coal mine safety production. To a certain extent, the danger caused by coal and gas outburst is reduced, but t...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the limitation and danger to a certain extent in the above-mentioned prior art in the gas drainage, there is a large amount of engineering, low pertinence, and poor effect, and the construction personnel are easily exposed to the In the gas environment, the safety guarantee for construction personnel is insufficient

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