Development and testing of environmental protection technology for rational integrated development of high-gas-bearing coal deposits with associated coalbed methane extraction and utilization
- Moscow Geological Prospecting University
Abstract
The technology of coal bed degassing using the effect of hydraulic impact and redistribution of rock pressure in the bottom-hole zone has been developed and tested in the mines. The basic technology provides hydraulic treatment of coal seam with water injection at pressure of 100-150 atm. Under the proposed technology, at the stage of flowing water from the well in the calculated mode, hydraulic shocks are realized by cyclic overlapping of the water flow, which causes pressure pulses with an amplitude of 170-200 atm. In addition, the technological variant of changing the rock pressure in the vicinity of the borehole by forming slots located along the helical line has been developed. Tangential stresses arise in the coal massif, which leads to increase of its permeability. The given technological variants provide increase of coalbed methane flow rate by 1.5-2 times.
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