METHOD FOR HYDRAULIC FRACTURING OF ROCK Russian patent published in 2006 - IPC E21C41/18 E21B43/16 

FIELD: mining, particularly to prepare coal seam for following bore mining.

SUBSTANCE: method involves drilling bore and supplying suspension under pressure in the bore, wherein the suspension includes liquid and finely-dispersed material insoluble in the liquid; introducing and fixing casing pipe in bore, wherein the casing pipe has orifices located in seam crossing areas. The liquid is liquefied carbon dioxide, which is to be heated with hot gas supplied to bore, or by means of current source. Current source clamps are connected to metal casing pipe to vaporize the liquid. The bore is plugged in interval over rock layer to be subjected to hydraulic fracturing before liquid carbon dioxide heating.

EFFECT: prevention of rock massif overwatering, reduced power inputs for hydraulic fracturing operation.