Dickinson W.,Circle Technology |
Campbell S.,Hopes Creek |
Turk V.,Circle Technology
NACE - International Corrosion Conference Series | Year: 2012
Preservation of petroleum quality and control of microbiologically influenced corrosion (MIC) in petroleum storage and transfer facilities are critical issues in the oil and gas industry. To address these issues, a model storage tank / dead-leg system has been developed and used to establish biocide efficacy in controlling microbiological growth and MIC for use in these facilities. The model system employs a glass tank reactor containing a dodecane/aqueous phase solution in combination with a 12-position modified Robbins device (MRD) which serves as the dead-leg. Removable carbon steel coupons in the tank and dead-leg enable determination of sessile bacterial populations. In tests using an oilfield consortia of sulfate-reducing (SRB), acid-producing (APB), and general heterotrophic bacteria (GHB), a proprietary broad-spectrum oilfield biocide was shown to effectively control growth of planktonic and sessile bacteria both in the tank and the dead-leg segment, achieving a 4 to 6 - log reduction in viable bacteria and exhibiting both short-term and sustained microbial control. Corrosion analysis of metal coupons exposed to bacteria in the dead-legs demonstrated a dramatic mitigation of corrosive attack for the biocide-treated coupon compared to an untreated control. ©2012 by NACE International. Source
Wrangham J.B.,Baker Hughes Inc. |
Summer E.J.,Hopes Creek
NACE - International Corrosion Conference Series | Year: 2013
Obtaining representative and accurate microbiological samples often proves challenging in the oil and gas industry. It is common to sample and test fluids (containing planktonic/free-floating microbes) for the detection and enumeration of problematic species, despite the fact that biofilms or sessile (attached to pipe or vessel wall) microbes are those which cause the majority of problems. This practice occurs because many field scenarios do not allow for sessile sampling. Collecting a representative sample is imperative in any microbial monitoring program, as they estimate the possible risk to the facilities. Misinformation can lead to microbiologically influenced corrosion (MIC) failures or other costly consequences. These planktonic samples are also often used for kill tests, or biocide selection testing, which may not accurately determine the ideal chemistry for the eradication of the sessile bacteria consortia. In this study, metagenomic population analyses of planktonic and sessile samples taken from three geographically distant locations reveals that the planktonic sample population is not representative of the sessile population. In fact, planktonic and sessile samples from the same location may be as different from each other as they are to samples obtained from other locations. Therefore, planktonic sample analyses should not be inferred to accurately or satisfactorily represent the sessile population and associated risk to the facilities. © 2013 by NACE International. Source
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