Pressure and temperature transient analysis of geothermal wells with low permeability

Abstract

Geothermal well testing is performed during completion activities. The test provides insight into the wellbore and reservoir properties, such as permeability, skin factor, skin radius, boundaries, and faults. Traditionally, the analyses are performed with a focus primarily on pressure transients, potentially overlooking valuable information in the temperature transient, which can improve predictive models. This study analyses pressure and temperature transients of two sets of geothermal well test data with low permeability. By adding the temperature analysis, this study aims to examine the temperature behaviour and enhance the reliability of well-test analysis by considering the contribution of temperature analysis. The results show that the temperature response is related to the reservoir's permeability and the wellbore temperatures. At the same time,the pressure can stabilise even when the temperature remains transient.