Effects of Iron-Oxidizing Bacteria on Carbon Steel in Oilfield Produced Water

Abstract

The effects of iron-oxidizing bacteria (IOB) on the corrosion of carbon steel in oilfield produced water was investigated by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), weight loss and electrochemical measurements including open-circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization curve measurements. SEM morphologies showed that the biofilm was mainly composed of corrosion products, extracellular polymeric substances (EPS) and little IOB. Additionally, without IOB, the corrosion products were only iron oxides. EIS indicated that the integrity of biofilm on the specimen surface changed with time and the biofilm removed partly at later stage. Potentiodynamic polarization curves indicated that IOB mainly influenced the cathodic process at later stage, and enhanced local corrosion of specimen.

Complementary DNA/RNA-Based Profiling: Characterization of Corrosive Microbial Communities and Their Functional Profiles in an Oil Production Facility

“…Lately, MIC has been reclassified into two different mechanisms, chemical MIC (CMIC) that considers metal deterioration induced by corrosive chemical species produced via microbial metabolic activity (indirect corrosion), and electrical MIC (EMIC) that refers to the damage caused by direct microbial uptake of electrons from the steel (direct corrosion) (Enning and Garrelfs, 2014). Causative microorganisms have been classified in microbial groups according to their metabolic activities, such as sulfide producing prokaryotes that include sulfate and thiosulphate reducers (Machuca et al, 2017; Machuca and Polomka, 2018), acid-producing (Gu and Galicia, 2012; Gu, 2014), methanogens (Uchiyama et al, 2010), iron-oxidizing (Ashassi-Sorkhabi et al, 2012; Liu et al, 2014), and iron-reducing bacteria (Herrera and Videla, 2009). Microorganisms with these metabolic capabilities are part of the normal microbiota of petroleum reservoirs (Magot et al, 2000; Ollivier and Magot, 2005).…”

Corrosion behavior of carbon steel in the presence of sulfate reducing bacteria and iron oxidizing bacteria cultured in oilfield produced water

“…Some oil-water gathering pipeline systems contain a small amount of dissolved oxygen to support the growth of both aerobic IOB and anaerobic SRB [26]. The oil produced water usually contains 1-3 mg/L dissolved oxygen.…”

Study on Biofilm Forming Microorganisms Associated with the Biocorrosion of X80 Pipeline Steel in Produced Water from Oilfield

“…According to the literature, usually the chloride anion is usually in greater quantity, whereas sulfate (SO 4 2-), carbonate (CO 3 2-) and bicarbonate (HCO 3 -) are in small amounts in the produced water. The most commonly found cations are sodium (Na + ), potassium (K + ), calcium (Ca 2+ ) and magnesium (Mg 2+ ) [53][54][55][56] . In Figure 4b and (b 1 ), corrosion products with non-adherent and porous aspect are observed on the coupon surface exposed to the biotic system.…”