Istituto di Geoscienze e Georisorse     
D'Amore F., Pruess K. Correlations between steam saturation, fluid composition and well decline in vapor-dominated reservoirs. In: Geothermics, vol. 15 (2) pp. 167 - 183. Elsevier, 1986.
A large body of field data from Larderello and other vapor-dominated geothermal reservoirs shows striking temporal correlations between (1) decline of well flow rate, (2) gas/steam ratio, (3) chloride concentration, (4) degree of superheat and (5) vapor fraction. The latter is inferred from concentrations of non-condensible gases in samples of well fluid, using chemical phase equilibrium principles. Observed temporal changes in the vapor fraction can be interpreted in terms of a “multiple source” model, as suggested by D'Amore and Truesdell (1979, Models for steam chemistry at Larderello and The Geysers. Proc. 5th Workshop Geothermal Reserv. Engng, Stanford, California, pp. 283–297). This provides clues to the dynamics of reservoir depletion and to the evaluation of well productivity and longevity.
URL: http://https://www.journals.elsevier.com/geothermics
Subject well tests. reservoir engineering

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