Synergistic Effect of Caco3 Scale Layer and Sulfate-Reducing Bacteria on the Corrosion Behavior of X80 Steel Pipelines

Abstract

Analyze the corrosion behavior under the synergistic effect of sulfate-reducing bacteria (SRB) and the scale layer (CaCO3) induced inside a water injection pipeline. With an X80 steel pipeline as the experimental material and an oilfield injected water simulation solution as the experimental medium, this study conducted weight-loss tests and electrochemical experiments. Combined with the experimental results, scanning electron microscopy, electrochemical impedance spectroscopy, element and phase analyses, and 3D corrosion morphology reconstruction  were used to explore the changes and mechanism of corrosion behavior under the synergistic effect of CaCO3 scale layer and SRB strain in water injection pipelines used in oilfields.

Keywords: CaCO3 scale layer, Sulfate-reducing bacteria (SRB), Synergistic effect, X80 steel pipeline, Microbiological corrosion