Geothermal reservoir evaluation considering fluid adsorption and composition

Conference · Sun Apr 01 04:00:00 EST 1984 · Soc. Pet. Eng. AIME, Pap.; (United States)

OSTI ID:6644354

Economides, M J; Miller, F G

The concept that adsorbed water is a major source of the production fluid in vapor-dominated geothermal reservoirs is presented in this paper. The implications of adsorption on material balance calculations and on well test analysis are determined by incorporating adsorption effects into existing models. Experimental and theoretical evidence of adsorption phenomena is described, pointing to the conclusion that considerable adsorbed water exists in vapor-dominated zones. Previous reservoir engineering studies of vapor-dominated geothermal reservoirs have generally been analogous to conventional-model studies for natural gas reservoirs. One inconsistency in the existing work has been a discrepancy between the estimated quantity of steam-in-place and the geological constraints on the estimated reservoir bulk volume. The new methods of analysis presented here provide a more realistic estimate of the nature reserve estimation is of a considerable magnitude. This work shows that a reserve estimate based on geologic evidence and the thermodynamic properties of steam could be as much as an order of magnitude lower than the actual mass of water present.

• Research Organization: Univ. of Alaska
• OSTI ID: 6644354
• Report Number(s): CONF-840495-
• Conference Information: Journal Name: Soc. Pet. Eng. AIME, Pap.; (United States) Journal Volume: SPE 12740
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
150200* -- Geology & Hydrology of Geothermal Systems
150904 -- Geothermal Engineering-- Geothermal Reservoir & Well Performance
ADSORPTION
ENERGY SYSTEMS
ENGINEERING
EQUILIBRIUM
FLUIDS
FRACTURED RESERVOIRS
GEOLOGIC MODELS
GEOTHERMAL FIELDS
GEOTHERMAL FLUIDS
GEOTHERMAL SYSTEMS
HYDRAULIC CONDUCTIVITY
HYDROTHERMAL SYSTEMS
NATURAL STEAM
PHYSICAL PROPERTIES
POROSITY
RESERVOIR ENGINEERING
RESOURCE ASSESSMENT
SORPTION
STEAM
THERMAL EQUILIBRIUM
THERMAL WATERS
THERMODYNAMIC PROPERTIES
VAPOR PRESSURE
VAPOR-DOMINATED SYSTEMS