IMPROVING MICROBIAL CONTROL IN PRODUCED WATER FROM OIL FIELDS: A 5-STEP APPROACH

Microbial control in oil fields can be considered a complex subject, since microbiome diversity and physical-chemical characteristics of produced water (PW) originate a unique profile in oil fields. Standard biocides are used as chemical treatment, but the toxicity and the high volumes can cause elevated environmental impacts. Treatment effectiveness and, consequently, reduction of environmental impact may be improved through an adequate planning. The present study examines the bacterial resistance mechanisms to biocides and suggests a 5-step approach for the treatment planning: 1) determination of objectives; 2) bioaudit; 3) selection of biocide(s) in laboratory; 4) selection of representative Key Performance Indicators (KPI); and 5) monitoring of the treatment. Finally, this article demonstrates an optimization of a biocide treatment using the 5-step approach. The results show a reduction of approximately 50% in the dosage of the biocide, as well as reduction in frequency of dosage.