Study on under-deposit corrosion behavior of X65 steel in simulated CO2 saturated produced water

• DOI: 10.1016/j.ijoes.2024.100731
• Publication Date: 2024-07-18T01:23:55Z
• Authors: Liang Guo; Ping Chen; Chao Huang; Jianqiang Zhang; Yan Xue; Xinran Zhang; Jiayi Tang; Shuliang Wang; Hu Wang
• Keywords: Partial pressure

Under-deposit corrosion is a key issue in various processes of oil and natural gas production. In this paper, the behavior X65 steel under CaCO3 scales was investigated, which are commonly occurred such environments. To simulate different conditions scaling, accelerated scaling achieved through cathodic polarization on samples. Subsequently, chemical immersion weight loss test performed over 72 h simulated produced water at 40°C with CO2 partial pressure 0.5 MPa (total 1 MPa). The results indicated that pre-scaling duration significantly influenced rate steel. Notably, samples scaled for 6 exhibited 0.1572 mm/a, markedly higher than 0.0371 mm/a unscaled High-temperature high-pressure situ electrochemical measurements were carried out to reveal varying time, including open circuit potential, linear resistance, impedance spectroscopy curves. Additionally, scanning electron microscopy used observe surface morphology cross-sectional microstructures before after product layer removal, facilitates discussion mechanisms under-deposit corrosion.