Date of Award

December 2025

Document Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Department

Petroleum Engineering

First Advisor

Sven S. Egenhoff

Abstract

This research investigates the complex dynamics of fluid flow through intersecting rough fracture surfaces. Addressing the gaps in understanding the interplay between fracture roughness and fluid flow behaviors, this work employs a combination of numerical modeling and experimental simulations.Utilizing 3D printing technology, realistic fracture models were fabricated to replicate rough fracture geometries and intersection angles. These models were subjected to fluid flow experiments to explore linear and nonlinear flow regimes. Additionally, computational fluid dynamics (CFD) simulations provided insights into the impacts of fracture roughness, aperture, and intersection angles on permeability and flow dynamics. A critical analysis of fracture surface properties such as roughness, aperture and intersecting angles variation conducted to elucidate their roles in flow regime transitions and deviations from the cubic law. The study reveals significant deviations from traditional parallel-plate flow models in fractures with high roughness or complex intersection geometries. Nonlinear flow behaviors, including eddy formation and increased flow tortuosity, were identified as key contributors to these deviations. The findings have important implications for optimizing fluid transport in subsurface reservoirs and contribute to developing more accurate discrete fracture network (DFN) models for energy and environmental applications. This integrated approach of experimental and numerical investigations enhances the understanding of fluid flow mechanisms in fractured media, providing a foundation for improving the efficiency and safety of subsurface operations.

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