Recent research led by Wang Kui and his team from the Technology Center at Dalipu Petroleum Special Pipe Co., Ltd., in collaboration with the State Key Laboratory of Advanced Special Steel at Shanghai University, sheds light on the crucial issue of CO2 corrosion in steel pipes used in oil fields. This study, published in ‘Cailiao Baohu’ (Materials Protection), presents significant findings that could reshape material selection in the construction and oil industries.
The research focused on the corrosion behavior of N80Q steel pipes, which are commonly employed in oil extraction. Utilizing a high-pressure autoclave, the team simulated the underground corrosive environment at 90°C and a flow rate of 1.0 m/s. The results revealed that the three types of steel—25Mn2, 1CrRE, and 2Cr—exhibited uniform corrosion characteristics, with no significant differences in their average corrosion rates. This uniformity suggests that all three materials could be viable options for deployment in similar conditions, thereby simplifying decision-making for engineers and project managers in the field.
Wang Kui highlighted the importance of understanding corrosion dynamics in oil extraction environments. He stated, “Our findings provide a valuable reference for material selection, ensuring that the integrity of steel pipes is maintained even under harsh conditions.” This insight is particularly timely, as the industry faces increasing pressure to enhance the durability of materials while minimizing operational costs.
The study also delved into the composition of corrosion product films formed on the steel surfaces. These films, primarily consisting of FeCO3 and a minor presence of FeOOH, displayed a relatively dense double-layered structure. The presence of Fe3C as an anode in the corrosion film was identified as a key factor that could lead to a significant decrease in corrosion rates at elevated temperatures. This mechanism not only informs material selection but also opens avenues for the development of protective coatings or treatments that could further enhance the lifespan of steel pipes in corrosive environments.
Commercially, these findings could lead to more cost-effective solutions for oil extraction companies, reducing the frequency of pipeline replacements and maintenance. As the construction sector increasingly prioritizes sustainability and efficiency, the insights gained from this research may inspire innovations in material science that align with these goals.
As the oil industry continues to evolve, understanding the specifics of corrosion behavior in high-pressure environments becomes ever more critical. The work of Wang Kui and his colleagues not only addresses immediate concerns but also sets the stage for future advancements in material technology. For more information about the research team, visit Dalipu Petroleum Special Pipe Co., Ltd..