Use of Advanced Molecular Microbiology Methods to Manage Microbial Corrosion Issues in Topside Facilities.

Abstract

Abstract Objectives/Scope Microbial growth in topsides facilities (water injection, oil production and distribution systems) is a widely recognized phenomenon leading to a range of impacts, for instance microbiologically influenced corrosion (MIC). MIC typically occurs as localized pitting and can develop rapidly (and measured in mm per year), leading to unexpected production shutdowns, environmental impact due to leaks, major unplanned repairs and increased chemical treatment costs. In severe MIC cases, the system may even need to be replaced, sometimes with corrosion resistant alloys, with marked economic consequences to operators. The threat of MIC has traditionally been very difficult to assess due to its rapid, localized, nature and due to the challenges of getting reliable information about microbial communities from system samples. Methods Recent advances in molecular microbiology technologies, particularly with respect to next generation sequencing technologies and quantitative PCR assays targeting functional and phylogenetic marker genes, have now made it possible to reliably identify and quantify a range of oilfield MIC-related microorganisms. Results and Conclusions Through case studies, this paper demonstrates how these molecular microbiology technologies can be used for monitoring, diagnosing and managing MIC on a routine basis focusing on key MIC indicator organisms and applying new approaches to interpret the MIC threat from the derived data. This paper furthermore suggests how MIC assessments can be integrated into existing corrosion management programs to target and tailor mitigation actions, minimizing the overall risk related to MIC. Novel/Additive Information These new advanced molecular microbiology tools, if properly integrated in corrosion management programs, hold potential for improving asset protection and cost savings for oilfield operators.