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Stochastic evaluation of the flow regime on rough and sheared fractures

Egert, Robert; Nitschke, Fabian; Gholami Korzani, Maziar; Kohl, Thomas

Abstract (englisch):
The detailed knowledge of the hydraulic properties is crucial for the assessment of geothermal reservoirs. In the case of Enhanced Geothermal Systems (EGS), fluid flow occurs along complex networks of faults and fractures that connect two or more boreholes. The geometric appearance and properties of these fractures are highly variable. They can be e.g. open or closed, altered and/or filled, smooth and rough. All these factors lead to unknown difficulties in predicting fluid pathways and quantifying flow behavior in the fractured reservoir and in the creation of numerical models.
In these numerical models, often highly simplified assumptions regarding flow behavior and geometry are used to project a fracture in 2D. The most common cubic law (CL) allows the calculation of the total fracture flow, while the local cubic law (LCL) considers the local pressure gradient as well as a local aperture. However, both flow laws pose the same problems: 1) The law is only valid for simple 2D geometries, 2) the aperture is defined and measured differently and 3) laminar Darcy flow is assumed. If these boundary conditions are no longer valid, e.g. during hydrotesting or in the vicinity of wells during production/injection, the complex and nonlinear Navier-Stokes equations must be solved.
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Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Publikationstyp Vortrag
Publikationsdatum 07.10.2020
Sprache Englisch
Identifikator KITopen-ID: 1000125983
HGF-Programm 35.14.01 (POF III, LK 01) Effiziente Nutzung geothermisch. Energie
Veranstaltung 8th European Geothermal Workshop (EGW 2020), online, 07.10.2020 – 08.10.2020
Bemerkung zur Veröffentlichung Die Veranstaltung fand wegen der Corona-Pandemie als Online-Event statt.
Schlagwörter Fracture flow Navier-Stokes Local Cubic Law Rough surface
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