Pressure loss through rock fracture intersections (2018)
AuthorsHermawan D, Brooks T, Sellier Mshow all
Over time, the extraction and reinjection of geothermal fluid to generate electricity results in a decrease in the overall pressure of a geothermal reservoir. This results in the precipitation of minerals that cause blockages in the power station equipment and the rock fractures in the reservoir; as well as a lower flow rate available for electricity generation. A better understanding of fluid flow in a fracture network is required to better predict the performance of the reservoir over time. This paper aims to determine a relationship for the pressure loss of flow through the intersection of two rock fractures connected end-to-end in a simplification attempt of a broader fracture network model. Computational Fluid Dynamic (CFD) simulations were carried out for various aspect ratios, Reynolds numbers and the angle of orientation of the two fractures. Using data fitting methods, a general expression was found linking the pressure loss, Reynolds number, and angle of orientation, given a specific aspect ratio. The model was able to predict three fractures in series within 14% accuracy.
CitationHermawan D, Brooks T, Sellier M (2018). Pressure loss through rock fracture intersections. Wairakei, New Zealand: 40th New Zealand Geothermal Workshop (NZGW). 14/11/2018-16/11/2018.
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Keywordsfractures; fluid flow models; geothermal reservoirs; pressure loss
ANZSRC Fields of Research09 - Engineering::0913 - Mechanical Engineering::091305 - Energy Generation, Conversion and Storage Engineering
09 - Engineering::0906 - Electrical and Electronic Engineering::090608 - Renewable Power and Energy Systems Engineering (excl. Solar Cells)