On Fluid and Heat Transfer in Deep Zones of Vapor-Dominated Geothermal Reservoirs
Conference
·
OSTI ID:888506
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.
- Research Organization:
- Earth Sciences Division, Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA; Istituto Internazionale per le Ricerche Geotermiche, Pisa, Italy; ENEL, Unita Nazionale Geotermica, Pisa Italy
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AT03-80SF11459; AS07-84ID12529
- OSTI ID:
- 888506
- Report Number(s):
- SGP-TR-109-13
- Country of Publication:
- United States
- Language:
- English
Similar Records
On fluid and heat transfer in deep zones of vapor-dominated geothermal reservoirs
Grid orientation effects in the simulation of cold water injection into depleted vapor zones
CO/sub 2/ trends in the depletion of the Larderello vapor-dominated reservoir
Conference
·
Wed Dec 31 23:00:00 EST 1986
·
OSTI ID:6784398
Grid orientation effects in the simulation of cold water injection into depleted vapor zones
Conference
·
Mon Dec 31 23:00:00 EST 1990
·
OSTI ID:888484
CO/sub 2/ trends in the depletion of the Larderello vapor-dominated reservoir
Conference
·
Mon Dec 31 23:00:00 EST 1984
·
OSTI ID:6041737