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Corrosion of carbon steel induced by a microbial-enhanced oil recovery bacterium Pseudomonas sp. SWP-4

Guihong Lan, Chao Chen, Yongqiang Liu, Yinchun Lu, Jiao Du, Sha Tao, Shihong Zhang
RSC advances 2017 v.7 no.10 pp. 5583-5594
Pseudomonas, carbon, corrosion, culture media, electrochemistry, energy-dispersive X-ray analysis, oil fields, oils, pipes, saprophytes, scanning electron microscopy, steel, sulfate-reducing bacteria
Pseudomonas sp. SWP-4 has been proved to enhance oil recovery effectively. However, corrosion to oil wells or pipes needs to be evaluated when SWP-4 is used. This study investigated the corrosion behavior of carbon steel induced by SWP-4. Results indicated that a mild effect on corrosion occurred in medium with SWP-4. Electrochemical parameters (Ecₒᵣᵣ, Icₒᵣᵣ, and Rcₜ) suggested that SWP-4 promoted the corrosion in the exponential phase in the fastest growth time. Surface morphologies and corrosion products were detected by using scanning electron microscopy and energy dispersive X-ray spectroscopy. Moreover, this study proved that oil–cell-free fermentation broth could inhibit the corrosion and the growth of sulphate-reducing bacteria and saprophytic bacteria.