Supercritical CO2 fracking for enhanced shale gas recovery and CO2 sequestration: Results, status and future challenges

Abstract

Supercritical carbon dioxide(ScCO₂)-based fracturing technology associating with CO₂ enhanced shale gas recovery is a promising technology to reduce the water consumption of shale gas production and could provide the potential for CO₂ sequestration. Advancing the understanding of complex gas shale reservoir behavior in the presence ofmultiphase and multicomponent gases (ScCO₂, gaseous CO₂ and CH₄ etc.) via laboratory experiments, theoretical model development and field validation studies is very important. In this paper, the progress of some key scientific problems such as the mechanism of ScCO₂ drilling and completion, the ScCO₂ fracturing technology, the competition adsorption behaviors of CO₂/CH₄ in shale, the coupled multiphase and multicomponent CO₂/CH₄ flow during the CO₂ enhanced shale gas recovery process and the CO₂ sequestration potential in shale formation were discussed. Finally, the challenges of the technique will face and the further research is needed in the future is also exposed.

Cited as: Zhou, J., Hu, N., Xian, X., Zhou, L., Tang, J., Kang, Y., Wang, H. Supercritical CO₂ fracking for enhanced shale gas recovery and CO₂ sequestration: Results, status and future challenges. Advances in Geo-Energy Research, 2019, 3(2): 207-224, doi: 10.26804/ager.2019.02.10

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