51312-01226-Laboratory Investigation of MIC Due to Hydrotest using Seawater and Subsequent Exposure to Pipeline

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Product Number: 51312-01226-SG

ISBN: 01226 2012 CP

Author: Jennifer Hornemann

Publication Date: 2012

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Microbiologically induced corrosion (MIC) is a concern to the oil and gas industry as well as many other industries. Previous studies show sulfate reducing bacteria (SRB) are often considered to be the culprits but not many other microbes that have also been known to contribute to MIC pitting such as nitrate reducing bacteria acid producing bacteria and methonogens. Even though MIC pitting during hydrotest may be minimal due to limited nutrient availability and short test duration the biofilms left behind on pipeline walls may flourish during operation resulting in pitting corrosion. This work investigated MIC resulting from simulated hydrotests using natural untreated seawater collected from the Gulf of Mexico at Galveston spiked with a laboratory strain of SRB (Desulfovibrio Alaskensis ATCC 14563). Following the hydrotest the coupons were exposed to a mixture of LVT oil water CO2 H2S chloride and sulfate simulating a production environment to further investigate pitting due to microbial activity. The effectiveness of biocide was also considered on a subset of the coupons tested. The pit depths ranged from 7 to 10 microns depending on temperature initial inoculation concentration and test duration.