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    Particle-laden fluid flow through porous media - Clogging

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    Name:
    AhmedHafezAbdelazizThesis (1).pdf
    Size:
    8.376Mb
    Format:
    PDF
    Embargo End Date:
    2021-11-29
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    Type
    Dissertation
    Authors
    Hafez, Ahmed cc
    Advisors
    Santamarina, Carlos cc
    Committee members
    Hoteit, Hussein cc
    Thoroddsen, Sigurdur T cc
    Finkbeiner, Thomas cc
    O'Sullivan, Catherine
    Program
    Energy Resources and Petroleum Engineering
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Date
    2020-11
    Embargo End Date
    2021-11-29
    Permanent link to this record
    http://hdl.handle.net/10754/666139
    
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    Access Restrictions
    At the time of archiving, the student author of this dissertation opted to temporarily restrict access to it. The full text of this dissertation will become available to the public after the expiration of the embargo on 2021-11-29.
    Abstract
    Colloids and suspensions are frequently encountered in energy geo-engineering applications, from natural processes such as fine particles suspended in subsurface water and oil, to engineered fluids such as drilling muds and proppants. Transported particles can clog porous media and alter the medium permeability and flow paths. This research explores particle laden fluids using pore- and fracture-scale experimental, analytical and numerical techniques. Particle shape emerges as an important dimension in bridge formation at the pore-scale. Experiments show that cubical particles and 3D crosses are the most prone to clogging because of their ability to interlock and to develop torque-resisting contacts. Simulation results reveal the complex arch geometries and associated force chains formed by different particle shapes. A large-scale parallel-plate configuration mimics particle-laden radial fluid flow at the fracture-scale. Experimental and numerical simulation results show the development of a negative pressure annular zone away from the central injection point as a result of fluid inertial effects at high Reynolds numbers. Gravity and inertial retardation cause particles to deviate from the fluid streamlines, which changes the local particle concentration and enhances clogging. Conventional treatments prevent fluid leakage into the subsurface for small-aperture fractures, but are inefficient for large openings. Magnetically-controlled aggregation emerges as a viable clogging alternative. Tests with a newly designed magnetorheological mud show that the suspended iron particles accumulate around magnetic poles and gradually form a plug that stops fluid flow (flow resumes once the magnetic field is removed). The complementary study investigates the granular self-assembly of engineered magnetic particles to form large architectures in a bubble-column reactor; results show the stochastic nature of collision-limited aggregation and the role of boundaries in constraining potential configurations. Bentonite-cement-oil mixtures exhibit surprisingly fast hydration and may be used for fluid loss control into large-aperture fractures. Linear and radial flow experiments reveal the complex interactions between concurrent processes: spontaneous imbibition, the release of hydrated ions during cement hydration, bentonite flocculation, and enhanced permeability. Complementary oedometer and cone penetration tests show the evolving swelling pressure and plug strength.
    Citation
    Hafez, A. (2020). Particle-laden fluid flow through porous media - Clogging. KAUST Research Repository. https://doi.org/10.25781/KAUST-60294
    DOI
    10.25781/KAUST-60294
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-60294
    Scopus Count
    Collections
    Energy Resources and Petroleum Engineering Program; Dissertations; Physical Science and Engineering (PSE) Division

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