METHOD OF HYDRAULIC FRACTURING Russian patent published in 2016 - IPC E21B43/267 

FIELD: mining.

SUBSTANCE: invention relates to methods of hydraulic fracturing. Method involves drilling of formation of vertical well, in lowering string up to interval of formation and performance of hydraulic fracturing - HF by pumping fracturing fluid through pipe string. At wellhead lower end of pipe string is equipped with a slot perforator with check valve at bottom and is run in to interval of formation. Method includes reverse washing in one and a half times well volume. Then by means of the slot perforator with orientation on azimuth of maximum stress and flow column, are created in range of sole and bed roof at two opposite slots with diameter up to 1.5 m and height of slot 0.2-0.25 well diameter. After that, in formation between slots through slit perforator by pumping of fracturing fluid through pipe string is performed hydraulic fracturing with formation of fractures. After formation of fractures method includes reinforcing fractures with ultra-light proppant with density 1,200-1,250 kg/m³. Pumping of fracturing fluid through pipe string through slot perforator is continued and simultaneously in annular space of well, pumping of proppant ultra-light under pressure not exceeding permitted on well walls. After fixation of fractures of pipe string with a slot perforator and check valve is removed from well.

EFFECT: higher quality of payout bed secondary exposure and broader technological capabilities of implementation of method.

1 cl, 3 dwg