ISOLATION METHOD OF BRINE WATER INFLUX IN WELL Russian patent published in 2012 - IPC E21B33/13 

FIELD: oil and gas industry.

SUBSTANCE: isolation method of brine water influx in the wall watered with brine waters with rise of gas-water contact above the middle of perforation interval, at which an adhesive patch is installed after the well is killed and production tubing is removed from it at the perforation interval of non-flooded part of productive formation. Water-isolating composition, for example gel, is pumped under pressure to the interval of watered part of productive layer through lower perforation holes so that water-isolating screen is created in the depth of watered part of productive formation. Water-isolating screen is fixed by pumping plasticised cement grouting through lower perforation holes, which has increased spreadability and penetrability. Cement bridge of cement grouting of normal density, which covers lower perforation holes, is installed in the well shaft at the interval of watered part of productive formation. After wait-on-cement time (WOC) is over and strength and leakage test of cement bridge is completed, repeated perforation of the perforation interval of non-watered part of productive formation covered with adhesive patch is performed at the most effective gas-saturated part of the section. Production tubing is lowered into the well to the depth of upper holes of new perforation interval and the well is developed.

EFFECT: increasing brine water influx isolation efficiency.

3 ex, 5 dwg