METHOD FOR INCREASING OIL RECOVERY FROM BEDS Russian patent published in 1998 - IPC

FIELD: oil production industry. SUBSTANCE: according to method, improved technological efficiency is achieved due to fact that method of increasing oil recovery from beds implies injection of muriatic acid solution, organic solvent, surface-active material, and water. Initially injected is emulsion of organic solvent, water and surface-active material. This emulsion additionally contains alkali agent. Content of emulsion components is as follows, mass%: surface-active material 0.5-10; organic solvent 5-30; alkali agent 1-10; water - the balance. Used as surface-active material is mixture of oil-soluble and water-soluble nonionogenic surface-active materials. Used as alkali agent is for example sodium carbonate or sodium phosphate. EFFECT: higher efficiency. 3 cl, 1 tbl