Numerical analysis of heat mining and geological carbon sequestration in supercritical CO 2 circulating enhanced geothermal systems inlayed with complex discrete fracture networks

Yang Wang, Tuo Li, Yun Chen, Guowei Ma

    Research output: Contribution to journalArticle

    10 Citations (Scopus)

    Abstract

    Enhanced geothermal systems using supercritical CO 2 (scCO 2 -EGS) as working fluid in place of water provides better heat extraction rate and sequestrates CO 2 in the formations for reducing atmospheric CO 2 content and the greenhouse effect. This paper proposed a numerical three-dimensional fully coupled thermo-hydro-mechanical (THM) model to simulate and evaluate the performances of heat mining and geological carbon sequestration in scCO 2 -EGS embedded in complex discrete fracture networks. The variable thermophysical properties of supercritical CO 2 in response to pressure and temperature are taken into account during the reservoir development. Verification, sensitivity analysis, and convergence for the model are accomplished. The three-spot layout of the practical EGS project at Soultz-sous-Forêts is then simulated using a stochastic DNF model under different operation pressures. The efficiencies and quantities of heat mining, carbon sequestration, and production of electric power for a period of 30 years have been studied and discussed. By verification against analytical solutions, the results demonstrate that the current nuermical model is effective to investigate the details of the multi-physical interactions in scCO 2 -EGS.

    Original languageEnglish
    Pages (from-to)92-108
    Number of pages17
    JournalEnergy
    DOIs
    Publication statusPublished - 15 Apr 2019

    Fingerprint Dive into the research topics of 'Numerical analysis of heat mining and geological carbon sequestration in supercritical CO <sub>2</sub> circulating enhanced geothermal systems inlayed with complex discrete fracture networks'. Together they form a unique fingerprint.

  • Cite this