An estimate of the pressure changes in the Ahuachapan geothermal reservoir by the reinjection of residual water from the well field into the Chipilapa area has been simulated through a 3-D model of the geothermal
system. The residual water from the current 15 producer wells will be injected by gravity through a pipeline 5.5 km long into 3 wells of the Chipilapa area. Two modes of injection have been simulated: First, an
injection of 260 kg/s related with the equilibrium pressure in the reservoir, and second, the injection of the total flow capacity for the reinjection wells (420kg/s). The simulation results after 12 years of continuous exploitation show a recovery pressure in the main exploitation zone of 2.2 bars using the second mode.

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