Volume 39: Energy Transitions toward Carbon Neutrality: Part II

Feasibility study of CO2 sequestration by high quality foam at the late development stage of high water-cut reservoirs Yali Liu, Chao Zhang, Zhaomin Li, Haitao Wang, Zengmin Lun, Jun Qi, Zhengwei Tang, Penghai Xu

Abstract

In order to store CO2 efficiently and safely, the innovative approach of storing CO2 in the water cut reservoirs entering the later stage of heavy oil development through high quality foam was proposed. Due to the high apparent viscosity of foam, the heterogeneity of reservoir was regulated, the CO2 mobility was controlled, and the CO2 storage efficiency was increased. In this paper, the influence of foam quality and reservoir permeability on CO2 storage efficiency and oil recovery was researched through sandpack model experiment. In addition, in order to truly simulate the water-cut reservoir, the three-dimensional model was designed. The variation laws of gas saturation, mobility reduction coefficient, and CO2 storage water consumption with the foam quality were summarized. The experimental results indicated that when the foam quality was 85%, the gas saturation of the water-cut reservoir was the highest, reached 75.36%, reflecting the high CO2 storage efficiency and the mobility control ability. Moreover, the water consumption for CO2 storage also dropped to the lowest, reached 43.88 g·mol-1, representing the high quality foam has good CO2 storage ability.

Keywords Carbon Utilization, Carbon Storage, High quality foam, water-cut reservoir, oil recovery