Cavity induced stimulation of coal degasification wells using so

Details Cavity induced stimulation of coal degasification wells using so Cavity induced stimulation of coal degasification wells using so

1991-12-11

1993-04-06

Bagnell, David J.

Mining or in situ disintegration of hard material

In situ conversion of solid to fluid

Dissolving or chemical reaction

166308, 241 1, 299 16, E21B 4326

Patent

active

051997665

ABSTRACT:
An improved method for stimulating coal degasification wells comprising the use of a coal comminuting solvent to weaken the cleat structure of a coal seam immediately prior to use of high pressure gas in a gas cavitation process. A solvent such as ammonia is injected into the coal seam and allowed to dissolve materials from the cleat structure for a period of time sufficient to weaken that structure. Thereafter, high pressure gas is injected into the coal seam and suddenly released to cause disintegration of coal surrounding the borehole.

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