Particle-laden fluid flow through porous media- Clogging

الموضوعات

علوم تطبيقية وتكنولوجية

الملخص

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.

روابط وملفات

التعريف والنوع

رقم الوثيقة

ef4ef4de-6c84-4fdb-9b57-b74cc8646ccc

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل دكتوراة

نوع الملف

pdf text

أسماء الملفات

2021247_1.pdf

بيانات النشر

ألقاب المؤلفين

[{"name_ar":"Ahmed Hafez","title_ar":"اعداد","title_en":"Preparation"},{"name_ar":"Carlos Santamarina","title_ar":"اشراف","title_en":"Supervision"}]

اللغة

English

المصدر والدورية

اسم المصدر

Particle-laden fluid flow through porous media- Clogging

المحتوى والصفحات

عدد الصفحات

0

كلمات الباحثين

dc.contributor.advisor Santamarina, Carlos dc.contributor.author Hafez, Ahmed dc.date.accessioned 2020-11-29T13:35:12Z dc.date.available 2020-11-29T13:35:12Z dc.date.issued 2020-11 dc.identifier.citation Hafez, A. (2020). Particle-laden fluid flow through porous media - Clogging. KAUST Research Repository. https://doi.org/10.25781/KAUST-60294 dc.identifier.doi 10.25781/KAUST-60294 dc.identifier.uri http://hdl.handle.net/10754/666139 dc.description.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 experimentsreveal 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. dc.language.iso en

إشراف وإعداد

الإشراف

Carlos Santamarina

الإعداد

Ahmed Hafez

الاقتباسات الببليوغرافية