PROCESS OF ISOLATION OF WATER INFLOWS IN OPERATIONAL WELLS Russian patent published in 2000 - IPC

FIELD: development of oil fields of floating type when stratal water underlies oil part of pool. SUBSTANCE: water and oil contact is determined. Lower part of shaft of well is filled with sand up to level beneath lower perforation holes. Intake capability of pool is found. Visco-elastic compound is pumped into pool. Cement bridge is installed in perforation zone and is drilled out. Face is normalized to level below water and oil contact. Shaft of well is then subjected to hydrostatic test. Holes are drilled in casing string in interval between water and oil contact and lower perforation holes. Intake capability of pool is increased. Visco-elastic compound is pumped. Permanent cement bridge is set in interval between lower perforation holes and normalized face. Shaft of well is subjected to hydrostatic test. Later repeat perforation is carried out in oil part of pool and well is run in. EFFECT: reduced water content in won production. 3 cl