| Abstract |
MULFEWS (a multi-feed wellbore simulator) has been developed to interpret the discharge mechanisms of a geothermal production well with multiple feed points or zones, which is seen ordinarily among wells at the Hatchobaru geothermal field in Japan. MULFEWS, the numerical model of which describes a well surrounded by porous reservoirs, was designed so that it can be used not only stand alone, but also coupled with a reservoir simulator. The main input data for MULFEWS are the depths of the feed zones together with the reservoir properties of each feed zone such as pressure, temperature or steam quality and permeability-thickness product, in addition to the casing design of the well. The main output are the mass deliverability curves as well as the pressure, temperature, flow-rate, and velocity profiles in the well while flowing. When MULFEWS was used for PTS (Pressure, Temperature, and Spinner) well logging data analysis at the Hatchobaru geothermal field, changes with time in the surrounding reservoir properties of each feed zone were quantitatively explained. |