METHOD FOR HYDRAULIC COAL BED FRACTURING Russian patent published in 2006 - IPC E21B43/267 

Abstract RU 2280762 C1

FIELD: mining, particularly to weaken coal bed and to increase recovery of desorbed methane.

SUBSTANCE: method involves drilling well from well surface; casing the well; exposing coal bed; injecting working liquid in the coal bed, wherein the working liquid has pressure enough to perform hydraulic fracturing of the bed and flow rate providing elongated crack forming. Salt solution, gel with propane or gel decomposition substance are used as the working liquid. Propane content in gel is gradually increased from 50-100 kg/m3 to 500-600 kg/m3 as cracks are formed and fixed. The salt is potassium chloride or propant having particle diameters of 20-40 meshes. Coal bed exposing is performed by cutting casing pipe and cement ring in central bed zone within interval of 100 mm so that the ready hole has height of 50-100 mm. The coal bed may be also opened by coal bed drilling below casing pipe for depth of 50-100 mm.

EFFECT: increased formation weakening and increased methane recovery.

3 cl, 2 ex

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RU 2 280 762 C1

Authors

Karasevich Aleksandr Miroslavovich

Krejnin Efim Vul'Fovich

Storonskij Nikolaj Mironovich

Khrjukin Vladimir Timofeevich

Dates

2006-07-27Published

2004-12-30Filed