Well Test Data Analysis from a Naturally Fractured Liquid-Dominated Hydrothermal System

摘要

Production test data from a moderate-temperature geothermal well in the Basin and Range Province have been analyzed. The well is completed in granitic basement rock. Both the pressure transient and spinner data confirm that fractures provide the major component of the reservoir permeability. The productivity index of the well decreases and the apparent skin factor increases with increasing flow rate. This behavior is attributed to non-Darcy flow in the fractures near the well bore. A mathematical relation between flow rate and drawdown has been established that includes the non-Darcy and Darcy flow components. (ERA citation 09:032981)