On Fluid and Heat Transfer in Deep Zones of Vapor-Dominated Geothermal Reservoirs

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We have presented a preliminary analysis of permeability structure and fluid and heat flow conditions in the deeper horizons of the Larderello geothermal system. Our main observations and findings are: (1) Measurements in deep Larderello wells have indicated formation temperatures near 300 º C at 3000 m depth, and even higher temperatures at greater depth. (2) From an analysis of heat transfer mechanisms we suggest that a transition from vapor-dominated to liquid-dominated conditions must have been present in the natural state of the Larderello geothermal system. No reliable determination of the depth at which this transition occurred has yet been ... continued below

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89-96

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Pruess, K.; Celati, R.; Calore, C. & Cappetti, G. January 20, 1987.

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Description

We have presented a preliminary analysis of permeability structure and fluid and heat flow conditions in the deeper horizons of the Larderello geothermal system. Our main observations and findings are: (1) Measurements in deep Larderello wells have indicated formation temperatures near 300 º C at 3000 m depth, and even higher temperatures at greater depth. (2) From an analysis of heat transfer mechanisms we suggest that a transition from vapor-dominated to liquid-dominated conditions must have been present in the natural state of the Larderello geothermal system. No reliable determination of the depth at which this transition occurred has yet been made, but a depth of approximately 2000 m or more appears most likely. (3) From temperature-depth data in two-phase reservoirs it is in principle possible to estimate vertical permeability. (4) For exploited reservoirs such as Larderello, reconstruction of permeability and temperature trends with depth can be made indirectly, using numerical simulation. Our preliminary results indicate that production of high-enthalpy fluids can be explained from two-phase flow effects in a fractured-porous medium. 18 refs., 2 tabs., 7 figs.

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89-96

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  • Proceedings, Twelfth Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, Calif., January 20-22, 1987

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  • Report No.: SGP-TR-109-13
  • Grant Number: AT03-80SF11459
  • Grant Number: AS07-84ID12529
  • Office of Scientific & Technical Information Report Number: 888506
  • Archival Resource Key: ark:/67531/metadc885210

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  • January 20, 1987

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  • Sept. 21, 2016, 2:29 a.m.

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  • Jan. 19, 2018, 2:15 p.m.

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Pruess, K.; Celati, R.; Calore, C. & Cappetti, G. On Fluid and Heat Transfer in Deep Zones of Vapor-Dominated Geothermal Reservoirs, article, January 20, 1987; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc885210/: accessed January 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.