| abstract |
The invention relates to biotechnology and the oil industry, in particular to microbiological methods for displacing oil from a waterlogged formation, and can be used to extract residual oil from freshwater wells. The chain of the invention is to increase the efficiency of the method. The method includes the activation of formation microflora by introducing oil similar in composition to the initial oil of the developed formation and subsequent alternating injection of a water-air mixture containing general salts and non-aerated water. The oil is selected after determining the number of hydrocarbon-oxidizing bacteria, which g must be at least 10 produced water, and the volume of oil injected is determined experimentally from the volume of produced water containing bacteria. Due to the activation of formation microflora in the formation, the conditions for the displacement of residual oil are improved and the final oil recovery is increased by 5-10%. 1 tab. |