Heat depletion in sedimentary basins and its effect on the design and electric power output of CO2 Plume Geothermal (CPG) systems

RENEWABLE ENERGY

卷:172

Article

Adams, Benjamin M.^1,2  Vogler, Daniel¹  Kuehn, Thomas H.²  Bielicki, Jeffrey M.^3,4  Garapati, Nagasree^1,5  Saar, Martin O.^1,6 

[1] Swiss Fed Inst Technol, Dept Earth Sci, Geothermal Energy & Geofluids Grp, Sonneggstr 5, CH-8092 Zurich, Switzerland

[2] Univ Minnesota, Dept Mech Engn, 111 Church St SE, Minneapolis, MN 55455 USA

[3] Ohio State Univ, Dept Civil Environm & Geodet Engn, 2070 Neil Ave, Columbus, OH 43210 USA

[4] Ohio State Univ, John Glenn Coll Publ Affairs, 1810 Coll Rd, Columbus, OH 43210 USA

[5] West Virginia Univ, Dept Chem & Biomed Engn, POB 6102, Morgantown, WV 26506 USA

[6] Univ Minnesota, Dept Earth & Environm Sci, 116 Church St SE, Minneapolis, MN 55455 USA

关键词: CO2 geothermal;    Geothermal electricity;    CCUS;    Reservoir heat depletion;    Sedimentary basin geothermal;   

DOI  :  10.1016/j.renene.2020.11.145

来源: Elsevier

【 摘 要 】

CO2 Plume Geothermal (CPG) energy systems circulate geologically stored CO2 to extract geothermal heat from naturally permeable sedimentary basins. CPG systems can generate more electricity than brine systems in geologic reservoirs with moderate temperature and permeability. Here, we numerically simulate the temperature depletion of a sedimentary basin and find the corresponding CPG electricity generation variation over time. We find that for a given reservoir depth, temperature, thickness, permeability, and well configuration, an optimal well spacing provides the largest average electric generation over the reservoir lifetime. If wells are spaced closer than optimal, higher peak electricity is generated, but the reservoir heat depletes more quickly. If wells are spaced greater than optimal, reservoirs maintain heat longer but have higher resistance to flow and thus lower peak electricity is generated. Additionally, spacing the wells 10% greater than optimal affects electricity generation less than spacing wells 10% closer than optimal. Our simulations also show that for a 300 m thick reservoir, a 707 m well spacing provides consistent electricity over 50 years, whereas a 300 m well spacing yields large heat and electricity reductions over time. Finally, increasing injection or production well pipe diameters does not necessarily increase average electric generation. (c) 2020 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

【 授权许可】

Free