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Mitigation Of Carbon Steel MIC Using THPS Enhanced By A Biofilm Dispersing Peptide In A Flow Loop With An Oilfield Biofilm Consortium

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MIC is a major threat to oil pipelines because it reduces the service life of pipelines and can potentially leads to catatrophes. Microbial communities commonly associated with pipeline corrosion include sulfate reducing bacteria (SRB), acid producing bacteria (APB), acetogenic bacteria and methanogens. In a field environment, SRB, APB and other microbes often live in a synergistic biofilm consortium. Sessile SRB are often the main culprit of MIC. They can utilize sulfate as the terminal electron acceptor and various carbon sources and elemental iron as electron donors. Corrosive APB biofilms are also a contributing factor in an acidic environment because they release H+ which is an oxidant.

Product Number: 51322-17560-SG
Author: Di Wang, Tuba Unsal,Mazen A. Saleh, Mohammed D. Alotaibi, Magdy E. Mohamed, Sith Kumseranee, Suchada Punpruk, Tingyue Gu
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings
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Biocorrosion, also called microbiologically influenced corrosion (MIC), is a major threat to oil and gas pipelines. The formation and morphology of biofilms can be impacted by fluid flow. Fluid velocity affects biocide distribution and MIC. Thus, testing the efficacy of a biocide for the mitigation of MIC under flow condition is desired before a field trial after a static test in vials has confirmed its efficacy. In this work, a bench-top closed flow loop system was set up to investigate the biocide mitigation of MIC of C1018 carbon steel at 25oC for 7 days using enriched artificial seawater. An oilfield biofilm consortium was analyzed using metagenomics. The biofilm consortium was grown anaerobically in the flow loop which had a holding vessel for the culture medium and a chamber in the flow path to hold coupons. Peptide A was a chemically synthesized cyclic 14-mer with its main 12-mer sequence inspired by a biofilm dispersing protein secreted by a sea anemone that has biofilm-free exteriors. The combination of 50 ppm (w/w) THPS (tetrakis hydroxymethyl phosphonium sulfate) biocide + 100 nM (180 ppb) Peptide A (biocide enhancer) resulted in extra 1-log reduction in sulfate reducing bacteria (SRB) sessile cell count and also in acid producing bacteria (APB) sessile cell count compared to 50 ppm THPS alone treatment. Furthermore, with the enhancement of 100 nM Peptide A, extra 44% reduction in weight loss and 36% abatement in pit depth were achieved compared to 50 ppm THPS alone treatment.

Biocorrosion, also called microbiologically influenced corrosion (MIC), is a major threat to oil and gas pipelines. The formation and morphology of biofilms can be impacted by fluid flow. Fluid velocity affects biocide distribution and MIC. Thus, testing the efficacy of a biocide for the mitigation of MIC under flow condition is desired before a field trial after a static test in vials has confirmed its efficacy. In this work, a bench-top closed flow loop system was set up to investigate the biocide mitigation of MIC of C1018 carbon steel at 25oC for 7 days using enriched artificial seawater. An oilfield biofilm consortium was analyzed using metagenomics. The biofilm consortium was grown anaerobically in the flow loop which had a holding vessel for the culture medium and a chamber in the flow path to hold coupons. Peptide A was a chemically synthesized cyclic 14-mer with its main 12-mer sequence inspired by a biofilm dispersing protein secreted by a sea anemone that has biofilm-free exteriors. The combination of 50 ppm (w/w) THPS (tetrakis hydroxymethyl phosphonium sulfate) biocide + 100 nM (180 ppb) Peptide A (biocide enhancer) resulted in extra 1-log reduction in sulfate reducing bacteria (SRB) sessile cell count and also in acid producing bacteria (APB) sessile cell count compared to 50 ppm THPS alone treatment. Furthermore, with the enhancement of 100 nM Peptide A, extra 44% reduction in weight loss and 36% abatement in pit depth were achieved compared to 50 ppm THPS alone treatment.

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Modelling Electrolytic Hydrofluoric Acid In The Fractionation Phase Change Corrosion Zone Of HF Alkylation Units

Product Number: 51322-17520-SG
Author: Andy C. Gysbers, J. Tim Korstanje, Michael S. Cayard, Peiming Wang, Ezequiel Vincent
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Product Number: 51322-17588-SG
Author: Jian Hou, Tao Chen, Ming Han, Mohammed Bataweel
Publication Date: 2022
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Scale is an adherent deposit of inorganic compounds precipitated from water onto surfaces. Most oilfield waters contain certain amounts of dissolved calcium, barium or strontium salts. The mineral scale can be formed by chemical reactions in the formation water itself, by mixing of formation water with injected seawater, or by mixing of the well streams of two incompatible oilfield waters. In carbonate reservoirs, when calcium is deposited as calcium sulfate or calcium carbonate scale, a loss of production and increased maintenance expenses can result. Therefore, effective mitigation of scaling potential is of importance to the oil producers.
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Microbiologically Influenced Corrosion Failure Of Ni-Coated Carbon Steel Fittings In Enhanced Oil Recovery Water Injection Service

Product Number: 51322-17793-SG
Author: Moavin Islam, Amal Al-Borno, Chad Walz
Publication Date: 2022
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This paper presents the findings of an investigation that was carried out to determine the root cause of the premature failure of Ni-coated carbon steel fittings on the water injection composite piping system installed at an oil production facility in Western Canada. The facility had been in operation since 2011 without major corrosion issues. Many of the Ni-coated fittings, which are expected to have a service life of 20 years, started to fail (developed leaks) unexpectedly after about 4 years. The core structure of composite pipe is a high-density polyethylene (HDPE) inner pipe, a middle layer of high-strength dry fiberglass, and a protective thermoplastic outer jacket. The interconnecting fittings are made of carbon steel coated with a thin, ~40 micron (1.5 mil) layer of Nickel.
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