Multi-fluid geothermal energy production and storage in stratigraphic reservoirs

Thomas A. Buscheck, Mingjie Chen, Yue Hao, Jeffrey M. Bielicki, Jimmy B. Randolph, Yunwei Sun, Hyungjin Choi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

Stratigraphic reservoirs (in sedimentary formations) are an under-explored play concept because they are typically associated with a conductive thermal regime, requiring greater depths to reach economic temperatures than hydrothermal upflows. On the other hand, stratigraphic reservoirs offer the advantages of higher permeability (and transmissivity), extending over much larger areas (> 100 km2) than typical upflows (<3 km 2), and have lower, predictable drilling risk. These make an attractive target for geothermal development, but several challenges need to be addressed. The primary challenge is to maximize heat extraction, while minimizing drilling and extraction costs. To increase extraction efficiency, we propose injecting supplemental fluids (CO2 and/or N2) to augment reservoir pressure, thereby enhancing fluid production rates. Because N2 can be readily separated from air, pressure augmentation can occur during periods of low grid power demand, which will reduce costs and enable energy storage. A well pattern consisting of a minimum of four concentric rings of horizontal producers and injectors is proposed to conserve pressure from injection operations, minimize loss of supplemental fluids, generate large artesian flow rates that take advantage of the large productivity of horizontal wells, and segregate the supplemental fluid and brine production zones. We present simulations of this approach for an idealized reservoir model, consisting of a relatively permeable sedimentary formation, vertically confined by two impermeable seal units. More realistic (heterogeneous) geologic settings and wellbore flow effects will be considered in future studies to more rigorously evaluate the potential economic advantages of this approach.

Original languageEnglish
Title of host publicationTransactions - Geothermal Resources Council
Pages123-132
Number of pages10
Volume37
EditionPART 1
Publication statusPublished - 2013
EventGeothermal Resources Council Annual Meeting: A Global Resource, from Larderello to Las Vegas, GRC 2013 - Las Vegas, NV, United States
Duration: Sep 29 2013Oct 2 2013

Other

OtherGeothermal Resources Council Annual Meeting: A Global Resource, from Larderello to Las Vegas, GRC 2013
CountryUnited States
CityLas Vegas, NV
Period9/29/1310/2/13

Keywords

  • Artesian flow
  • Energy storage
  • Geothermal energy
  • Reservoir simulation
  • Sedimentary formations

ASJC Scopus subject areas

  • Geophysics
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment

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  • Cite this

    Buscheck, T. A., Chen, M., Hao, Y., Bielicki, J. M., Randolph, J. B., Sun, Y., & Choi, H. (2013). Multi-fluid geothermal energy production and storage in stratigraphic reservoirs. In Transactions - Geothermal Resources Council (PART 1 ed., Vol. 37, pp. 123-132)