OIL RESERVOIR DEVELOPMENT METHOD (VERSIONS) Russian patent published in 2017 - IPC E21B43/22 C09K8/582 

FIELD: oil-and-gas industry.

SUBSTANCE: present invention relates to oil industry, in particular to microbiological methods of oil recovery. The process includes four possible methods forof development of oil reservoir, where in each case the injectivity of the injection well and water salinity are clarified in advance. The first and the second methods comprise depending the well injectivity 100 - 300 m³/day and the water salinity 0.15 - 100 g/l or 100-220 g/l, pre-injection of the mixture of hydrogen peroxide in the mineral salt solution in the volume 5-10 m³ or 10-15 m³ is performed then the cyclic injecting by alternating fringes is performed in the volume ratio 1: 1 of hydrocarbon oxidizing microorganism in the solution of mineral salts and in the mixture of hydrogen peroxide in the solution of mineral salts, and punching into the reservoir by the water with the salinity 0.15 - 100 g/l or 100-220 g/l in the volume 10-15 m³ and well shutdown for production seasoning within for 10-12 days. According to the third and the forth methods depending the well injectivity 300 - 500 m³/day and the water salinity 0.15 - 100 g/l or 100-220 g/l, pre-injection into the formation of the the water dispersion of wood flour with the concentration ot 0.005 - 1.0 wt.% is performed, then the mix of hydrogen peroxide solution in the mineral salt solution in the volume 5-10 m³ or 10-15 m³ is injected, then the cyclic injecting by alternating fringes is performed in the volume ratio 1: 1 of hydrocarbon oxidizing microorganism in the solution of mineral salts and in the mixture of hydrogen peroxide in the solution of mineral salts, and punching into the reservoir by the water with the salinity 0.15 - 100 g/l or 100-220 g/l in the volume 10-15 m³ and well shutdown for production seasoning for 10-12 days.

EFFECT: invention improves the efficiency of microbial stimulation, increases the coverage of the reservoir and minimize the watering.

12 cl, 3 tbl