Pressurised sand filled bioreactors have been used to create realistic physiochemical conditions to investigate chemical dosing for the control of oilfield reservoir souring. In a simulation of water injection and wellbore conditions, Molecular Microbiological Methods (MMM) were used to demonstrate that growth of mesophilic and thermophilic sulfate-reducing prokaryotes, including sulfate-reducing bacteria (SRB) and sulfate-reducing archaea (SRA), could be supported. Experimental trials investigated the feasibility of monitoring the onset of reservoir souring by measuring microbially influenced corrosion with an in-line MIC monitor and an integral linear polarization resistance monitoring (LPRM) probe. The subsequent impact of conventional shot dosing and more novel continuous dosing of third generation THPS on established bacterial populations, MIC, hydrogen sulfide generation and dissolution of existing corrosion deposits was evaluated.

Subject
Corrosion rate, Reactors, Iron sulfides, Seawater injection, Effluent, Reservoirs, Sulfide concentration, Carbon steel, Sulfides, THPS, Risk reduction, Corrosion potential, Microbiologically influenced corrosion
Keywords:
Souring, MIC, Pressurised, Bioreactors, SRB, SRA, Third Generation THPS, Molecular Microbiological Methods
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2014
Association for Materials Protection and Performance (AMPP)
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