Hydro-splitting of coal seams for their effective degassing preparation through underground wells

Abstract

The article is devoted to the issues of improving the complex technology of coal seam degassing based on its hydrodynamic treatment. The possible modes of implementation of the introduction of working fluid into the coal seam in the process of its injection through wells drilled from preparatory workings and specially sealed to a certain depth, which ensures minimization of breaks of working fluid into the mine. Studies have been carried out to optimize the main parameters of hydrodynamic effects. Rational values of the effective well length and injection volume are established. The expediency of achieving significant rates of injection of the working agent into the formation for the disclosure of natural systems of cracks in it is shown. The directions of increasing the efficiency of formation degassing are investigated. The effectiveness of the integrated reservoir degassing technology was evaluated based on the factors of increasing methane production from underground reservoir degassing wells drilled into the zone of influence of underground hydraulic fracturing wells, and the total methane removal over the entire period of reservoir degassing. The efficiency of improved technology of hydraulic fracturing in underground mining for factors reducing downtime pollution control equipment, gazoobilnosti stope and the productivity of coal mining in zones of intensive integrated reservoir degassing.

To the issue of monitoring the length of degasification boreholes

“…The formula (1) indicates that a propagation speed of a sound wave depends on the gasair mixture composition, as well as on the temperature. To refine the measurement results, additional software has been developed that allows editing data obtained during results processing [9,10].The software interface is shown in Figure 4, 5.…”

“…The coal seams degasification efficiency depends on stability of boreholes that are used for methane recovery [1,2]. At the same time, it is necessary to ensure the control of their condition [3][4][5][6].…”