METHOD FOR NON-UNIFORM OIL RESERVOIR DEVELOPMENT Russian patent published in 2008 - IPC E21B43/22 

FIELD: oil production, particularly microbiological and hydrodynamic methods for reservoir recovery increase.

SUBSTANCE: method to develop non-uniform oil reservoir comprising sulfate-reducing bacteria and hydrogen sulfide involves alternating pressure increase and pressure decrease intervals, wherein pressure is increased by water injection into injection wells with producing well shutdown and pressure is decreased by liquid extraction from producing wells with injection well shutdown. First of all oxygen-generation reagent having solved oxygen concentration of 250-700 g/m³ is injected in injection well. Then the well is stopped for time enough for hydrogen sulfide oxidation termination and sulfate-reducing bacteria killing. After that nutrient solution containing microorganisms and oxygen-generation reagent having 50-150 g/m³ of solved oxygen is supplied into injection well during pressure increase period so that injection is terminated simultaneously with pressure increase time finishing.

EFFECT: increased efficiency of reservoir treatment and decreased costs.

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