COMPOSITION FOR INCREASING OIL RECOVERY OF FORMATION Russian patent published in 2004 - IPC

FIELD: oil and gas production.

SUBSTANCE: invention relates to secondary and tertiary methods for increasing oil recovery of formations by affecting them with biological reagents. Composition according to invention contains 0.2-1.0% of excessive activated sludge coming from secondary settlers of biological waste disposal plants, 0.08-0.1% of powderlike activated carbon, and water. The latter can be over-sludge liquid or biochemically cleaned water. Jointly using indicated components improves sedimentation characteristics of activated sludge, speeds up biochemical processes, improves transfer of oxygen, involves exchange processes resistant to biochemical degradation of substance, and contributes to hydrotransport of microorganisms deep down the formation.

EFFECT: increased efficiency of biological reagent regarding formation due to improved its biological activity and increased watering coverage of formation.

2 cl, 4 tbl, 2 ex