METHOD FOR WATER INFLUX OR WATER LOST-CIRCULATION ZONE ISOLATION IN WELL Russian patent published in 2006 - IPC E21B33/13 

FIELD: oil industry, particularly methods or devices for cementing, for plugging holes, crevices, or the like.

SUBSTANCE: method involves drilling-in productive reservoir; drilling oil bed section and swabbing well to determine water inflow in well; providing pressure drawdown to move reservoir fluids through wells previously drilled in productive reservoir out of fissured reservoir part and through wells drilled in fissured reservoir part; injecting cement mix through well under pressure of not more than above pressure drawdown, which provides fluid movement through wells drilled out of fissured reservoir part. The cement mix contains oil and plugging Portland cement having density of 1570-1600 kg/m³, wherein the cement is taken in amount of 1.9-2.1 tons per 1 m³ of oil. The cement mix is forced with degassed oil up to full cement mix displacement from well. Cement mix density is gradually increased during injection operation.

EFFECT: increased efficiency of fissured productive reservoir part plugging.

2 cl, 1 ex