Brine displacement by CO2, energy extraction rates, and lifespan of a CO2-limited CO2-Plume Geothermal (CPG) system with a horizontal production well

Nagasree Garapati; Jimmy B. Randolph; Martin O. Saar

doi:10.1016/j.geothermics.2015.02.005

Brine displacement by CO₂, energy extraction rates, and lifespan of a CO₂-limited CO₂-Plume Geothermal (CPG) system with a horizontal production well

Nagasree Garapati, Jimmy B. Randolph, Martin O. Saar

Earth and Environmental Sciences-Twin Cities

Research output: Contribution to journal › Article › peer-review

62 Scopus citations

Abstract

Several studies suggest that CO₂-based geothermal energy systems may be operated economically when added to ongoing geologic CO₂ sequestration. Alternatively, we demonstrate here that CO₂-Plume Geothermal (CPG) systems may be operated long-term with a finite amount of CO₂. We analyze the performance of such CO₂-limited CPG systems as a function of various geologic and operational parameters. We find that the amount of CO₂ required increases with reservoir depth, permeability, and well spacing and decreases with larger geothermal gradients. Furthermore, the onset of reservoir heat depletion decreases for increasing geothermal gradients and for both particularly shallow and deep reservoirs.

Original language	English (US)
Pages (from-to)	182-194
Number of pages	13
Journal	Geothermics
Volume	55
DOIs	https://doi.org/10.1016/j.geothermics.2015.02.005
State	Published - May 1 2015

Bibliographical note

Funding Information:
This work was supported in part by a Sustainable Energy Pathways (SEP) grant from the U.S. National Science Foundation ( NSF ) under Grant Number SEP-1230691 , by the U.S. Department of Energy ( DOE ) under Grant Number DE-EE0002764 , and by a grant from the Initiative for Renewable Energy and the Environment ( IREE ), a signature program of the Institute on the Environment (IonE) at the University of Minnesota (UMN), U.S.A. Martin Saar additionally thanks the Werner Siemens Foundation for their endowment of the Geothermal Energy and Geofluids Chair at ETH Zurich (ETHZ) and the Gibson endowment for their support of the Hydrogeology and Geofluids Research group at UMN. Any opinions, findings, conclusions, and/or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the NSF, DOE, IREE, IonE, UMN, ETHZ, the Werner Siemens Foundation, or the Gibson Foundation. Finally, we thank the two anonymous reviewers and the Associate Editor, Dr. J.N. Moore, for their helpful comments that greatly improved this paper.

Publisher Copyright:
© 2015 Elsevier Ltd.

Keywords

Brine displacement
CO geothermal
Carbon capture and sequestration (CCS)
Carbon capture utilization and sequestration (CCUS)
Carbon dioxide
Energy extraction rates
Geothermal systems
Reservoir simulations

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.geothermics.2015.02.005

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title = "Brine displacement by CO2, energy extraction rates, and lifespan of a CO2-limited CO2-Plume Geothermal (CPG) system with a horizontal production well",

abstract = "Several studies suggest that CO2-based geothermal energy systems may be operated economically when added to ongoing geologic CO2 sequestration. Alternatively, we demonstrate here that CO2-Plume Geothermal (CPG) systems may be operated long-term with a finite amount of CO2. We analyze the performance of such CO2-limited CPG systems as a function of various geologic and operational parameters. We find that the amount of CO2 required increases with reservoir depth, permeability, and well spacing and decreases with larger geothermal gradients. Furthermore, the onset of reservoir heat depletion decreases for increasing geothermal gradients and for both particularly shallow and deep reservoirs.",

keywords = "Brine displacement, CO geothermal, Carbon capture and sequestration (CCS), Carbon capture utilization and sequestration (CCUS), Carbon dioxide, Energy extraction rates, Geothermal systems, Reservoir simulations",

author = "Nagasree Garapati and Randolph, {Jimmy B.} and Saar, {Martin O.}",

note = "Funding Information: This work was supported in part by a Sustainable Energy Pathways (SEP) grant from the U.S. National Science Foundation ( NSF ) under Grant Number SEP-1230691 , by the U.S. Department of Energy ( DOE ) under Grant Number DE-EE0002764 , and by a grant from the Initiative for Renewable Energy and the Environment ( IREE ), a signature program of the Institute on the Environment (IonE) at the University of Minnesota (UMN), U.S.A. Martin Saar additionally thanks the Werner Siemens Foundation for their endowment of the Geothermal Energy and Geofluids Chair at ETH Zurich (ETHZ) and the Gibson endowment for their support of the Hydrogeology and Geofluids Research group at UMN. Any opinions, findings, conclusions, and/or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the NSF, DOE, IREE, IonE, UMN, ETHZ, the Werner Siemens Foundation, or the Gibson Foundation. Finally, we thank the two anonymous reviewers and the Associate Editor, Dr. J.N. Moore, for their helpful comments that greatly improved this paper. Publisher Copyright: {\textcopyright} 2015 Elsevier Ltd.",

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AU - Saar, Martin O.

N1 - Funding Information: This work was supported in part by a Sustainable Energy Pathways (SEP) grant from the U.S. National Science Foundation ( NSF ) under Grant Number SEP-1230691 , by the U.S. Department of Energy ( DOE ) under Grant Number DE-EE0002764 , and by a grant from the Initiative for Renewable Energy and the Environment ( IREE ), a signature program of the Institute on the Environment (IonE) at the University of Minnesota (UMN), U.S.A. Martin Saar additionally thanks the Werner Siemens Foundation for their endowment of the Geothermal Energy and Geofluids Chair at ETH Zurich (ETHZ) and the Gibson endowment for their support of the Hydrogeology and Geofluids Research group at UMN. Any opinions, findings, conclusions, and/or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the NSF, DOE, IREE, IonE, UMN, ETHZ, the Werner Siemens Foundation, or the Gibson Foundation. Finally, we thank the two anonymous reviewers and the Associate Editor, Dr. J.N. Moore, for their helpful comments that greatly improved this paper. Publisher Copyright: © 2015 Elsevier Ltd.

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N2 - Several studies suggest that CO2-based geothermal energy systems may be operated economically when added to ongoing geologic CO2 sequestration. Alternatively, we demonstrate here that CO2-Plume Geothermal (CPG) systems may be operated long-term with a finite amount of CO2. We analyze the performance of such CO2-limited CPG systems as a function of various geologic and operational parameters. We find that the amount of CO2 required increases with reservoir depth, permeability, and well spacing and decreases with larger geothermal gradients. Furthermore, the onset of reservoir heat depletion decreases for increasing geothermal gradients and for both particularly shallow and deep reservoirs.

AB - Several studies suggest that CO2-based geothermal energy systems may be operated economically when added to ongoing geologic CO2 sequestration. Alternatively, we demonstrate here that CO2-Plume Geothermal (CPG) systems may be operated long-term with a finite amount of CO2. We analyze the performance of such CO2-limited CPG systems as a function of various geologic and operational parameters. We find that the amount of CO2 required increases with reservoir depth, permeability, and well spacing and decreases with larger geothermal gradients. Furthermore, the onset of reservoir heat depletion decreases for increasing geothermal gradients and for both particularly shallow and deep reservoirs.

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