Rheology and deposition of heterogeneous organic mixtures: an expansion of "cold flow" research

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Publication Type dissertation
School or College College of Engineering
Department Chemical Engineering
Author Jemmett, Mark Ryan
Title Rheology and deposition of heterogeneous organic mixtures: an expansion of "cold flow" research
Date 2012-12
Description The study of the rheological properties and deposition potential of organic mixtures such as petroleum are explored below the initial wax appearance temperature using a recycled flow loop, an active slurry-making device called the Scraped Exchanger, and a model oil made with mineral oil, paraffin wax, and LVGO wax. Sub-WAT (heterogeneous) oils, when flowed under isothermal (ambient and oil temperatures are the same) and non-isothermal conditions exhibit no deposition and greatly reduced deposition when compared to similar thermal gradients in above-WAT (homogeneous) oils, respectively. Heterogeneous oils form gels during shutdown just as with homogeneous oils, but the gel strength is greatly reduced (>50%) even with very little precipitated material (oil temperature at shutdown just below WAT). Solids content at shutdown appears to show little effect on subsequent gel strength. Particle size distributions measured using CantyVision equipment at shutdown also show little to no effect on subsequent gel strength, suggesting a balance between particle size and particle count, as well as a fundamental difference in gel matrix structure compared to homogeneous gels. In the ranges tested, all heterogeneous gels exhibited cohesive ("center-core") failure manifested as breakage occurring first within the gel instead of at the walls. Breakage patterns explored using laser particle imaging velocimetry.
Type Text
Publisher University of Utah
Subject Cold Flow; Deposition; Flow Assurance; Gel; Rehology; Wax
Dissertation Institution University of Utah
Dissertation Name Doctor of Philosophy
Language eng
Rights Management Copyright © Mark Ryan Jemmett 2012
Format Medium application/pdf
Format Extent 3,847,985 bytes
ARK ark:/87278/s6w38b4k
Setname ir_etd
Date Created 2013-01-03
Date Modified 2017-09-15
ID 195767
Reference URL https://collections.lib.utah.edu/ark:/87278/s6w38b4k