METHOD OF DEVELOPING OIL DEPOSIT Russian patent published in 1999 - IPC

FIELD: oil and gas production. SUBSTANCE: when developing oil deposits with nonuniform reservoirs, crude oil is produced through productive wells, working agent is injected through injection wells, and polymer-dispersion system is periodically injected through at least one injection well, said dispersion consisting of water-soluble polymer solution, aqueous dispersion of solid particles, and buffer liquid (pH 7.2 to 13.1) raising pH value of system to 7.2-13.1. The latter is injected between injections of the two first components. EFFECT: increased oil recovery due to expanded treatment area. 2 cl