Biofilms and Processes of Biocorrosion and Biodeteriorationin Oil-and Gas-Processing Industry

摘要

As a rule, oil- and gas-processing equipment and pipelines are attacked by differentrnmicroorganisms. Their vital ability determines processes of biodeterioration and biocorrosionrnthat lead often to technological accidents and severe environmental contamination.rnBiofilms presenting a complex association of different microorganisms and their metabolitesrnare responsible for most of damages. In this context, to study the role biofilms mayrnplay in processes of biodamages and in efficacy of protective measures is important.rnWe have developed method of culturing biofilms on the surface of metal coupons byrnusing a natural microbial association isolated from oil-processing sites. Simple and informativernmethods of determining microbiological parameters of biofilms required to study biocorrosionrnprocesses are also developed. In addition, a method of electron microscopic analysis ofrnbiofilms and pitting corrosion is offered.rnUsing these methods, we conducted model experiments to determine the dynamics ofrncorrosion processes depending on qualitative and quantitative composition of biofilms, aerationrnconditions and duration of the experiment.rnA harmful effect of soil bacteria and micromycetes on different pipeline coatings wasrnalso investigated. Experiments were conducted within 3-6 months and revealed degradingrnaction of microorganisms. This was confirmed by axial tension testing of coatings. All thesernapproaches will be used for further development of measures to protect gas- and oilprocessingrnequipment and pipelines against biocorrosion and biodamages ( first of all biocides).