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The algorithm of SHAFT78 i s based on mass and energy-balance equations f o r two-phase flow i n a porous medium. We convert the basic d i f fe ren t ia l equations in to integrated f ini te-difference form. This allows regular and i r regular reservoir shapes to be handled with the same ease. The equations are solved semi-implicitly f o r discrete time steps. The present version of SHAFT78 t r e a t s the coupling between mass and energy flow i n a noniterative way. Special provisions a re made t o compute phase t ransi t ions with high accuracy. We have ver i f ied the program by computing a number of sample problems tha t previously had been investigated by other authors. reveal tha t two-phase geothermal reservoirs a re capable of a great var ie ty of pressure responses upon production. We show tha t the standard techniquc of estimating reserves by extrapolating a plot of p/; vs cumulative production i s not applicable t o twophase eothermal reservoirs. W e develop a bulk model 7 lumped parameters) f o r a two-phase reservoir tha t admits an analyt ical solution €or pressure decline upon production. i n many cases pressure will be a l inear function of cumulative production, with the slope allowing an estimate of t o t a l reservoir volume. Reserve assessment requires knowledge of average porosity an( vapor saturation, which cannot be obtained from pressure decline curves. Our model studies From this we conclude tha t

Description Of The Three-Dimensional Two-Phase Simulator Shaft78 For Use In Geothermal Reservoir Studies