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Microbiologically influenced corrosion (MIC) presents risk to operators and infrastructure in many industries. This work shows the continued potential of novel sulphidogenesis-inhibitory compounds and recent gains towards decreasing the impact of H2S production and on MIC.
Hydrogen sulfide (H2S) generation by sulfur-compound reducing microbes is one of the central drivers of microbiologically influenced corrosion (MIC). MIC presents significant risk to operators and infrastructure in many industries, including those involved in oil and gas production. Because of its corrosivity, toxicity to humans, and its ability to devalue produced fluids and gas, H2S is particularly undesirable in the oilfield. Microbial growth can occur throughout oil and gas production systems, but high levels of H2S are often associated with growth of sulfide-producing bacteria and archaea within the reservoir itself, resulting in souring of the produced fluids and gas. A number of chemistries intended to prevent microbial H2S generation have been studied for their efficacy against sulfide-producing oilfield microbes, with varying degrees of success. To this end, a new class of compounds has recently been introduced that have been shown to be extremely effective at inhibiting sulphidogenesis at extremely low dosages in both bottle tests and continuously fed bioreactors. In the work presented herein, two additional classes of sulphidogenesis inhibitory chemistries are introduced and the impact of these three classes of molecules against MIC, as well as H2S generation, is considered. Altogether, this work shows the continued potential for discovery of novel sulphidogenesis-inhibitory compounds as well as the recent gains made towards decreasing the impact of H2S production and on MIC as a whole.
Key words: sulfate-reducing bacteria, microbiologically influenced corrosion, MIC, hydrogen sulfide, H2S, reservoir souring, biocide
This paper presents new applications of Volatile Corrosion Inhibitors (VCI) inside new and/or existing out-of-service pipelines. The system utilizes a combination of soluble and volatile corrosion inhibitors that are directly applied into the pipeline.
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On-site personnel can now be trained to gather and test samples. Development of this on-site testing kit is described and a case study presented on its use in the field. Feedback provided from on-site personnel, and further development of the method are discussed.
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