Numerical Investigations into the formation of a high temperature reservoir

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This paper summarizes an ongoing numerical modeling effort aimed at describing some of the thermodynamic conditions observed in vapor-dominated reservoirs, including the formation of a high temperature reservoir (HTR) beneath the "typical" reservoir. The modeled system begins as a hot water geothermal reservoir, and evolves through time into a vapor-dominated reservoir with a HTR at depth. This approach taken here to develop a vapor-dominated system is similar to that of Pruess (1985), and involves induced boiling through venting. The reservoir description is intentionally generic, but serves to describe a means of evolution of conditions observed (in particular) at The Geysers. ... continued below

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91-95

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Shook, Mike January 28, 1993.

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Description

This paper summarizes an ongoing numerical modeling effort aimed at describing some of the thermodynamic conditions observed in vapor-dominated reservoirs, including the formation of a high temperature reservoir (HTR) beneath the "typical" reservoir. The modeled system begins as a hot water geothermal reservoir, and evolves through time into a vapor-dominated reservoir with a HTR at depth. This approach taken here to develop a vapor-dominated system is similar to that of Pruess (1985), and involves induced boiling through venting. The reservoir description is intentionally generic, but serves to describe a means of evolution of conditions observed (in particular) at The Geysers. This study addresses the question of HTR formation numerically. The reservoir model and approach used is similar to that of Pruess (1985); however, vapor pressure lowering effects were included for the rock matrix. Results of this study indicate that a high temperature reservoir may occur as a steady state component of a "typical" vapor-dominated reservoir. Fractures within the HTR are dry; however, saturated conditions exists in the rock matrix. Pressures at depth follow a vapor pressure with depth relationship. Temperatures at depth are large (relative to saturated conditions) because of superheat in the fractures and vapor pressure lowering in the matrix. Drying out the fracture network at depth appears to be what drives the system to form a high temperature reservoir; however, adsorption in the rock matrix allows for saturated conditions to prevail.

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91-95

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  • Proceedings, eighteenth workshop on geothermal reservoir engineering, Stanford University, Stanford, CA, January 26-28, 1993

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  • Report No.: SGP-TR-145-13
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 888901
  • Archival Resource Key: ark:/67531/metadc885336

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 28, 1993

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  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 30, 2016, 1:39 p.m.

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Shook, Mike. Numerical Investigations into the formation of a high temperature reservoir, article, January 28, 1993; United States. (digital.library.unt.edu/ark:/67531/metadc885336/: accessed July 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.