An Analytical Model for the Corrosion Risk of Water Alternating Gas Injection Wells in CO2 Enhanced Oil Recovery

作者：Wang, Zi Ming; Song, Guang-Ling^*

来源：Advanced Theory and Simulations, 2018, 1(7): 1800041.

DOI：10.1002/adts.201800041

• CO2 enhanced oil recovery
• CO2 injection
• corrosion risk
• water alternating gas
• well leakage

An analytical model is proposed to describe the corrosion risk profile of a well tube in water alternating gas (WAG) CO2 injection conditions based on the assumption that the drying process of the water layer on the inner wall of the well tube plays a crucial role in controlling corrosion. In this model, the fluid properties, the thermodynamic equilibrium of CO2 and water steam, and an empirical CO2 corrosion equation are systematically considered. The description by this model reasonably indicates that fast injection can decrease the corrosion risk and push the highest risk region to a deeper zone, while a longer drying time for a thicker water layer left on the well inner wall can lead to higher corrosion risk. It can also be deduced that the offshore WAG case is more aggressive than the onshore case and some mitigation strategies are suggested for reducing the corrosion risk. These should be helpful for corrosion management and leakage monitoring in the practical WAG CO2 injection.

• 出版日期2018-7
• 单位厦门大学