METHOD OF DEVELOPMENT OF NONUNIFORM PERMEABLE OIL FORMATIONS Russian patent published in 2003 - IPC

FIELD: oil producing industry, particularly, methods of development of oil deposits with nonuniform permeable formations with use of physico-chemical methods of increase of formation oil recovery. SUBSTANCE: method includes simultaneous-separate injection through injection wells of polymer solution fringes with their subsequent displacement with water. Interlayer with lower permeability is considered as base into which polymer is not injected. Volumes and viscosity of polymer solutions injected into other interlayers are selected to equalize filtration resistance so that moment of their approach to producing well coincides with moment of approach of displacement front in base interlayer. Volumes of fringes and viscosity of polymer solutions injected to other interlayers are determined from calculation of variation of velocities of movement of their displacement fronts in each of interlayer so that their fronts approach producing well simultaneously with displacement front in base interlayer under concrete geological physical conditions. EFFECT: higher efficiency of development of layer-nonuniform permeable oil formations with use of aqueous solutions of polymers. 2 cl, 1 tbl