| Abstract |
The response of the geothermal reservoir at Wairakei to 40 years of production is described in this paper. Initially, rapid change in deep pressure was observed with consequent decline in mass flows and formation of shallow vapour dominated zones. Recharge to the reservoir by both deep and shallow fluids has led to the attainment of lower and relatively stable liquid pressures and temperatures in the major production aquifer. Production from the induced shallow steam zones has been undertaken. Future production is expected to be sourced from the Te Mihi area. Reinjection has commenced successfully and is expected to provide the major challenge to the management of the field for the next 40 years. |