METHOD OF DIRECTED HYDRAULIC FRACTURING OF RESERVOIR Russian patent published in 2012 - IPC E21B43/26 

FIELD: oil-and-gas production.

SUBSTANCE: proposed method comprises exposing the reservoir by vertical or inclined borehole, perforating the reservoir in preset range of productive reservoir with injection of working fluid therein to produce slits therein and fracturing reservoir via formed slits. Note here that perforation in vertical or inclined borehole is performed in preset range of productive reservoir, not perforated earlier, by hydromechanical slit perforator to produce slits oriented in azimuthal direction. After producing said slot, perforator is withdrawn from borehole and tubing with packer is lowered therein. Directed fracturing is performed in preset range of productive reservoir via aforesaid slit. Then tubing with packer is withdrawn. Tubing with washing tool is lowered therein to wash borehole bottom. Then, isolating sand bridge is made to isolate produced fracture. Then tubing with washing tool is withdrawn. Tubing with slit perforator tool is lowered therein oriented in azimuthal direction. Another slit is produced as described above and fracturing is carried. Tubing with washing tool is lowered therein to wash borehole bottom down to current bottom. At larger thickness of productive reservoir, slits are produced and fractured in staggered order through 90 degrees with respect to each other, or slits are formed in pairs wherein slits are arranged through 180° and pairs are arranged through 90° with respect to each other. Every new slit is isolated by sand bridge.

EFFECT: higher efficiency of hydraulic fracturing.

4 cl, 6 dwg