Optimizing the Palinpinon 2 Geothermal Reservoir, Southern Negros Geothermal Production Field, Philippines

Abstract

Excess steam is currently available from the existing production wells in the Palinipinon-2 area of the Southern Negros Geothermal Production Field that could be utilized for an additional 20 MWe modular power plant in the Nasuji area. An assessment of the Palinipinon-2 reservoir performance using simple decline curve analysis and correlation of the historical pressure drawdown-enthalpy-mass flow trends of the existing wells showed that the field could support the additional capacity with minimal drawdown of around 1 MPa. The excess steam supply will be complemented by work-over and acidizing of some wells that have suffered mineral deposition inside the wellbore and in the formation and possible drilling of one additional well.
This paper discusses the results of the assessment in projecting the performance of the reservoir, the work-over and acid stimulation jobs, and the discharge testing so far conducted to meet the steam requirement of the additional power plant. The development strategy for the optimization project is also discussed.