METHOD FOR RECOVERY OF RESERVOIR NATURAL PROPERTIES, IMPAIRED DURING ITS OPENING WITH BORING Russian patent published in 2010 - IPC E21B43/22 

FIELD: oil-and-gas industry.

SUBSTANCE: invention related to methods for recovery of reservoir natural properties, contaminated with uncontrolled penetration of boring fluid and cement slurry filtrates into reservoir's bottomhole zone (BHZ), during the reservoir opening with boring and casing string cementing, creating stable water-oil emulsions, which blocks penetration intervals. In the method for recovery of reservoir natural properties, impaired during its opening with boring, which includes pumping composition of a surface active substance - SAS mixed with dissolver into reservoir interval, the composition over flushing into BHZ and process ageing execution; the composition contains wt %: "Oil-Plast 04" 0.8-1.6, sodium liquid glass 3-5, carboximetilcellulose 0.2-0.4, the rest is water: and after the composition over flushing into BHZ until hydrostatic equilibrium condition, pumping a clay composition into tubing string in volume 0.1-0.15 m³, but not exceeding a pressure 4 MPa on a cementing aggregate CA - 320 M manometre, repeat it several times, till pressure drop at the manometre stopped, preliminary sealing hole clearance by shutting wellhead discharge prevention equipment and lifting a drill column over the composition top level, execute process ageing, wash the well descending the sting until bottomhole.

EFFECT: process simplification and BHZ treatment cast cutting.