METHOD FOR DEVELOPMENT OF OIL DEPOSIT WITH LOW-PERMEABLE CLAY-BEARING RESERVOIR Russian patent published in 1998 - IPC

FIELD: oil and gas production industry. SUBSTANCE: reduced period of developing deposit, increased output of producing wells and uniform recovery of oil in deposit sections can be achieved by differential increase of permeability of down-hole zones of injection and producing wells. Method implies removing clay from producing and injection wells with subsequent displacement of oil from bed by means of polymeric solution. Clay removing is effected by applying various amounts of desedimentation reagent depending on permeability of down-hole zones of wells being treated. Concentration of water solution of polymer is selected between concentration at which fluidity of polymer solution in water in down-hole zone of bed in which clay is removed is equal to fluidity of water in aforesaid zone prior to clay removal and concentration at which specific increase of oil recovery from deposit is maximal. EFFECT: higher efficiency. 2 dwg, 2 tbl