Experiences in Developing a Dual Porosity Model of the Leyte Geothermal Production Field

Abstract

The Leyte geothermal production field is among the largest developed geothermal system in the world. It has a total installed capacity of 700MWe and more than 180 production and injection wells have been drilled over its more than 30 years of production life. Several numerical models have been developed in the past for use in managing the production in the field. The recent numerical model has been updated with significant enhancements of previous models. The model now uses a more efficient grid system with a finer grid resolution. It also includes the implementation of dual porosity and automated model calibration.
The model is presently in the calibration stage. Significant progress in calibration has been accomplished in the past months and the model is now in a satisfactory state for use in prediction of future reservoir response. Nonetheless, calibration effort is still being continued to get a still better match of model response to the measured data. Therefore, this paper is a work-in-progress report of the latest numerical simulation effort on the Leyte geothermal production field. The purpose of this paper is to convey the challenges encountered during the development and automated calibration of the model and how some of those challenges were handled.