Influence of sulfate-reducing bacteria on the objects of the oil and gas complex and methods of inactivation their vitality
In the process of oil fields development, the injection of a mixture of fresh and produced water into the reservoir leads to the introduction of non-friendly microorganisms and substances into the formation, which provide an increase in the growth of the micro-fauna various biocenoses. The most common microorganisms in oil and gas fields are classified in the article. The conditions of vital activity of sulfate-reducing bacteria, the specificity of their influence on the metal structures and equipment of the oil and gas complex are considered. The article describes the nature of the interaction of sulfate-reducing bacteria with polymers used in technological processes of oil production, the results of studying the rate of biodegradation of polymers under the influence of microorganisms are presented. The nature of the sulfate-reducing bacteria vital activity influence on the filtration properties of the bottom hole zone of injection wells, as well as their role in the secondary precipitation of calcite, is considered. A classification of the existing methods of suppressing the vital activity of sulfate-reducing bacteria is proposed. The peculiarities of biological contamination of the field pipeline system under conditions of low reservoir temperatures are considered. A perspective method for reducing the consumption of bactericides and increasing the effectiveness of bactericidal treatments with the preliminary introduction of nonionic surfactants into the medium is revealed.