METHOD OF DEVELOPMENT OF OIL FIELD Russian patent published in 1999 - IPC

FIELD: oil producing industry, particularly, methods of development of oil fields and oil recovery with utilization of oil-emulsifying and oil-washing ability of bioreagents. SUBSTANCE: method includes injection of aqueous solution of biological surfactant through injection well and oil withdrawal from producing well. Use is made of biological surfactant KshAS-M and additionally use is made of product of biotechnological synthesis containing, at least, 40% of raw protein with weight ratio from 1:0.5 to 1:10. EFFECT: higher efficiency of method under conditions of formations nonuniform in permeability at late stage of development by means of redistribution of filtration flows and improvement of oil- emulsifying and oil-washing ability. 2 cl, 1 tbl, 1 ex