Modeling coupled convection and carbon dioxide injection for improved heat harvesting in geopressured geothermal reservoirs
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- 作者：Tatyana Plaksina ; Christopher White
- 关键词：Geothermal energy ; Geopressured brines ; Saline aquifers ; Natural convection ; Forced convection ; Carbon dioxide sequestration ; TOUGH2
- 刊名：Geothermal Energy
- 出版年：2016
- 出版时间：December 2016
- 年：2016
- 卷：4
- 期：1
- 全文大小：2,329 KB
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Christopher White (2)
1. Department of Petroleum Engineering, Texas A&M University, 907 Richardson Hall, College Station, TX, 77843, USA
2. Department of Earth and Environmental Sciences, University of Tulane, Room 200 Blessey Hall, New Orleans, LA, 70118, USA - 刊物主题：Geotechnical Engineering & Applied Earth Sciences; Renewable and Green Energy; Geoecology/Natural Processes;
- 出版者：Springer Berlin Heidelberg
- ISSN：2195-9706
文摘
Geopressured geothermal saline aquifers are an abundant low-enthalpy geothermal energy resource available in many coastal regions including the US Gulf of Mexico. In such geographic areas thick geopressured sandstones (up to several hundred meters thick) hold tremendous geothermal heat with conservative estimates of gross extractable energy approximately 0.2 EJ per cubic kilometer of the formation. Additionally, widespread geopressure in sedimentary deposits of the Gulf region preserves favorable petrophysical properties of unconsolidated sandstones such as high porosity and permeability, thus, enhancing productivity and economics of potential heat harvesting projects. In this study we investigate the potential of a typical geopressured reservoir in the US Gulf coast to deliver commercial quantities of geothermal heat with the possibility of simultaneous supercritical CO2 sequestration into the same formation. Specifically, we focus on numerical simulation study of heat extraction from a model based on the Camerina A sand of South Louisiana. In our numerical experiments, we consider both theoretical and practical implications of combining a traditional heat harvesting method with supercritical CO2 injection. Moreover, this study pays specific attention to the effect of natural convection due to the formation’s tilt and uneven heating at the reservoir boundaries and its impact on the forced convection due to geofluid withdrawal. The numerical simulation results suggest that introduction of supercritical CO2 might have an observable positive effect on the ultimate heat recovery and that a strategic injection/production well placement might further enhance density-driven flows inside the geothermal formation. Keywords Geothermal energy Geopressured brines Saline aquifers Natural convection Forced convection Carbon dioxide sequestration TOUGH2