by Nenny Miryani Saptadji and Heru Berian Pratama. Geothermal Engineering Study Program, Institut Teknologi Bandung, Indonesia.
The main issue in the management of the two-phase liquid-dominated geothermal field is a rapid pressure decline in the reservoir which affects steam supply to the power plant.
The changes of reservoir characteristic due to mass and heat extraction from the reservoir can be learned through a numerical simulation under numerous strategies production-injection. The model developed on liquid-dominated geothermal fields are assessed with various scenarios of production strategies (steam cap, brine reservoir, and combination) and injection strategies (deep, shallow, centered and dispersed), for generation of 110 MW and 220 MW using separated steam cycle.
A full factorial scenario of 32 production-injection strategies has been successfully carried out. The results show a relatively low decrease in reservoir pressure and steam flow rate for a production strategy combined with the steam cap and brine reservoir, with deep and dispersed injection strategy.
From the simulation, it can be concluded that the strategy for sustainable production is a production of 25% from steam cap and 75% from brine reservoir, dispersed and deep reinjection with 9 make-up wells from the steam cap. The implementation of production-injection strategy needs to be planned right from the beginning of exploitation, therefore, the strategy can adapt to changes in reservoir characteristics.
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