WELL PERFORATION METHOD Russian patent published in 2010 - IPC E21B43/00 

FIELD: oil-and-gas industry.

SUBSTANCE: well perforation method includes well's selective perforation in reservoir interval. At that execute perforation at depression, with case disposable perforators, form the bottom to the top along the reservoir interval with density of 2-5 holes per 1 linear m and for the upper located intervals - with density of 5-10 holes per 1 linear m. Set up depression value not greater then maximum one, which defines as difference between cement ring ultimate pressure drop value in hole clearance, while it increases liquid starts circulating in hole clearance, and between reservoirs existing pressure drop.

EFFECT: reservoir interval watering liquidation.