METHOD OF DROWNED OIL POOL DEVELOPMENT AT LATE STAGE Russian patent published in 2003 - IPC

FIELD: oil producing industry; applicable in development of drowned oil pool at late stage. SUBSTANCE: method includes injection of working agent through injection wells in nonstationary regime; determination of character of distribution of oil-saturated strata; determination of current value of oil saturation with gas; periodic operation of highly water-encroached wells found in zones of low values of oil-saturated strata; operation of wells found in zones of high values of flown oil-saturated strata under conditions of forced withdrawal of fluid. Method provides for stage control of filtering properties of producing section accomplished in injection wells. In this case, injected at the first stage into injection wells are compositions regulating hydrodynamic resistance in bottom-hole zone of injection wells for equalization of injectivity profiles. At the second stage, injected into the same injection wells are compositions changing the safety directions of filtration flows in interwell space remote from injection line. EFFECT: increased completeness of oil reserve withdrawal and oil current recovery. 1 tbl, 1 ex