METHOD FOR WATER INFLUX ISOLATION OF OIL WELL Russian patent published in 2016 - IPC E21B43/32 E21B43/11 E21B43/16 

FIELD: oil and gas industry.

SUBSTANCE: invention can be used during development of oil deposits with bottom water. Method involves pumping water-insulating material into borehole environment and oil extraction. Method comprises perforation in production well of interval of oil-water contact, interval above and below oil-water contact. Pumping into interval of oil-water contact a first fringe of water-insulating material with density greater than density of oil and less than density of formation water and creating a barrier for formation water flow during contact with formation water. Pumping is stopped. Simultaneous pumping is performed in interval above water-oil contact of first fringe of oil and in interval below oil-water contact of first fringe of formation water with same pressure and with same flow rate. Pumping is stopped. Method includes injecting into interval of oil-water contact of a second fringe of water-insulating material. Pumping is stopped. Simultaneous pumping is performed in interval above water-oil contact of a second fringe of oil and in interval below oil-water contact of a second fringe of formation water with same pressure and with same flow rate. Pumping is stopped. Method includes repeating operations of pumping fringes of water-insulating material, oil and formation water before setting of water-insulating material. Method includes process holding for setting and hardening of water-insulating material. Method includes isolation in well of interval of oil-water contact and interval below oil-water contact from top of well volume and oil is extracted through interval above oil-water contact. Volumes of all first fringes are maintained equal and volumes of all second fringes are kept equal.

EFFECT: high efficiency of water influx isolation.

1 cl, 3 ex