METHOD OF HYDRAULIC FRACTURING AND ATTACHMENT OF FORMATIONS FORMED WITH LOOSE UNCEMENTED ROCKS Russian patent published in 2011 - IPC E21B43/267 

FIELD: mining.

SUBSTANCE: in method of hydraulic fracturing and attachment of formations formed with loose uncemented rocks the fracturing fluid is pumped to productive formation through tubing string and contains water solution of average-module liquid glass consisting of the following, wt %: sodium silicate 17-20, water 80-83, and acetone-alcohol solution consisting of water-free acetone and methyl alcohol in volume ratio of 0.4:1, at the following component ratio, wt %: the above solution of liquid glass 75-85, the above acetone-alcohol solution 15-25; when hydraulic fracturing of formation is achieved in fracturing fluid there in addition introduced is propping agent in quantity of 100-150 kg per 1 m³ of fluid to strengthen loose uncemented rocks of manifold in bottom-hole zone of productive horizon; after pumping of design amount of fracturing fluid with propping agent is completed to the formation there pumped is water-alcohol solution of calcium chloride with the following component ratio, wt %: calcium chloride 17.0-19.0, ethyl alcohol 25.0-45.0, water 36.0-58.0. At that, pumping of fracturing fluid to the formation is performed in 30-40 minutes after its preparation.

EFFECT: improving well productivity owing to creating large filtration surfaces by hydraulic fracturing of formation with simultaneous prevention of cracks formed during this process in productive formations of weakly cemented loose rocks.

2 cl, 2 ex, 1 tbl