Three Dimensional Interpretations of Single-Well Electromagnetic Data for Geothermal Applications Abstract

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.