Dynamic Numerical Simulation for Sustainability of Geothermal Reservoirs: an Enhanced Model of Patuha Geothermal Field

Abstract

In recent years, numerical simulation has emerged as a cornerstone practice within the geothermal industry. Using numerical reservoir simulation, we can comprehend and manage the complex dynamics of geothermal reservoirs. The Patuha geothermal field, a vapor-dominated geothermal reservoir located in West Java, Indonesia, was developed by PT. Geo Dipa Energi (Persero) has maintained an installed capacity of 60 MW since 2014. The numerical model of the Patuha geothermal field was developed in 2013 and subsequently updated in 2019. A new and enhanced numerical model has been developed to assess the reservoir changes resulting from fluid extraction within the reservoir. Compared with the previous model, this enhanced numerical model incorporates additional geoscience surveys, an updated conceptual model, thorough PT shut-in data analysis, and data from newly drilled wells. The reservoir simulation results, validated with the natural state and history matching calibration, provide a deeper understanding of the reservoir's condition and resources. This understanding aids in identifying and mitigating potential risks associated with reservoir extraction. Furthermore, this information is the foundation for short-term and long-term future development strategies, including production and injection strategies for the Patuha geothermal field.