METHOD FOR OIL FIELD DEVELOPMENT Russian patent published in 2007 - IPC E21B43/22 C09K8/582 C12N1/20 

FIELD: oil production, particularly to stimulate oil recovery by complex reservoir treatment with microorganisms and chemical reagents.

SUBSTANCE: method involves injecting aqueous biological reagent composition, namely active silt, via injection well downstream of secondary sumps of biological cleaning structure; injecting aqueous bactericide solution after 4-12 months; producing oil through production well. The aqueous composition includes active dried silt suspension of 6-15% concentration. The composition additionally has 2-14% by weight of nutrient medium, namely carbohydrate-mineral additive. 0.1-1% bactericide solution is used.

EFFECT: increased oil recovery due to improved efficiency of water-permeable flushed reservoir channels selectively blocked with biomass, increased oil displacement factor due to enhanced biochemical activity after the first stage and increased coverage of reservoir treatment due to biomass dispersion and possibility of well injectivity after well treatment with bactericide solution at the second stage.

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