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Currently, a big problem is increasing the production of residual oil, for which so-called tertiary recovery methods are used. One common tertiary recovery method is the use of surfactants. The use of biological surfactants instead of synthetic ones can solve the problem of increasing oil production and reducing the toxic impact on the environment. To obtain biosurfactants, two strains of Bacillus mojavensis and Bacillus amyloliquefaciens were used. These strains are characterized by the ability to produce biosurf...