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Evaluating Flow Regimes in a Stimulated Crystalline EGS Reservoir Using Pressure Transient Analysis (PTA): A Utah FORGE Case Study Farhad A.BINA, Hadi JABBARI [University of North Dakota, USA] |
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This study presents a novel application of Transient Analysis (PTA) to Well 16A (78)-32 in the Utah FORGE Enhanced Geothermal System (EGS), targeting a low-permeability, fractured crystalline reservoir. While much of previous FORGE research has focused on seismic, tracer, and thermal diagnostics, pressure transient analysis remains underutilized despite its potential to describe key well and reservoir dynamics. PTA techniques are applied to shut-in and circulation data, incorporating high-resolution pressure-temperature-spinner (PTS) logs to determine permeability and explore flow regimes, and fluid flow within fracture zones. Preliminary results indicate dominant radial flow patterns and pressure segmentation across multiple stimulated intervals, suggesting partially connected fracture networks. The analysis aims to establish a validated workflow for estimating transmissivity and characterizing flow behavior in high-temperature EGS settings. Pressure-based diagnostics provide valuable insight when complementing geophysical and geochemical tools, laying the foundation for integrating PTA into future EGS design and optimization strategies through fracture network assessment, stimulation evaluation, and long-term reservoir planning.
Topic: FORGE