STUDY OF PRODUCTION-INJECTION STRATEGIES OF SYNTHETIC GEOTHERMAL RESERVOIR LIQUID-DOMINATED MODEL WITH NUMERICAL SIMULATION

Abstract

The main issue in the management of liquid-dominated reservoir is the rapid decline of reservoir pressure. Therefore it is interesting to learn the reservoir characteristic changes due to mass and heat extraction from reservoir, at various production and injection strategies. To understand the changes in the reservoir characteristics, reservoir modelling or numerical simulation can be used.
The model developed on liquid-dominated geothermal fields is a synthetic model based on field data adopted from Wairakei, Tongonan, Awibengkok and Wayang Windu Geothermal Field. The model was assessed under various production and injection scenarios.
A synthetic liquid-dominated geothermal reservoir model has successfully been developed based on field data adopted from selected geothermal fields. The model has successfully carried out 32 scenarios of production-injection.
The simulation results showed the scenario with lowest reservoir pressure and steam flow rate decline is when 25% of the fluid is extracted from steam cap and 75% from brine reservoir, while fluid is injected with deep and dispersed reinjection strategy. The implementation of production-injection strategy needs to be planned right from the beginning of exploitation therefore it can adapt to changes in reservoir characteristics.