Effect of Temperature on Corrosion of L245 Steel Under CO2-SRB Corrosion System
Sun Ming, Xinhua Wang, Wei Cui, Chuntao Shi
Abstract
Microorganisms are often observed in the produced medium during the oil and gas extraction process. Corrosion caused by CO2 and microorganisms is found on the inner wall of the metal gathering pipelines during the production process. In order to explore the corrosion characteristics of L245 materials under the combined action of sulfate-reducing bacteria (SRB) and CO2, a CO2-SRB corrosion system was established in this paper. Experimental research on corrosion rate, surface morphology, and corrosion products analysis was conducted. The effect of temperature on the corrosion of SRB while CO2 is saturated and the partial pressure is 0.06 MPa was investigated. It was observed that the corrosion is more serious in the CO2-SRB corrosion system than that in the single CO2 corrosion system. At 40 °C, the corrosion caused by CO2 is 0.0597 mm/a, and the corrosion caused by SRB is 0.0766 mm/a. So, more attention should be paid to the corrosion status of gathering pipelines with microorganisms. Further, the activity of SRB is stronger when the temperature of the medium is 40 °C, and corrosion on L245 samples is more obvious under the experimental conditions in this article. In order to reduce the corrosion damage of metal pipelines with microorganisms, the temperature should be well controlled to reduce the activity of SRB during the production process.