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Permanent link (DOI): https://doi.org/10.7939/R3ZB1C

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2-D pore and core scale visualization and modeling of immiscible and miscible CO2 injection in fractured systems Open Access

Descriptions

Other title
Subject/Keyword
miscible CO2 injection, immiscible CO2 injection, first contact miscible displacement, fractured porous media, micromodel
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Er, Vahapcan
Supervisor and department
Babadagli, Tayfun (Civil and Environmental Engineering)
Examining committee member and department
Kuru, Engin (Civil and Environmental Engineering)
Mitra, Sushanta (Mechanical Engineering)
Department
Department of Civil and Environmental Engineering
Specialization

Date accepted
2009-06-09T20:12:57Z
Graduation date
2009-11
Degree
Master of Science
Degree level
Master's
Abstract
Pore scale interaction between matrix and fracture during miscible and immiscible CO2 injection was studied experimentally using visual models. Initially, visualization experiments were conducted on 2-D glass bead packed models by injecting n-heptane (solvent) displacing different kinds of processed oil. The focus was on the displacement patterns and solvent breakthrough controlled by matrix-fracture interaction and the pore scale behaviour of solvent-oil interaction for different fracture and injection conditions (rate, vertical vs. horizontal injection) as well as oil viscosity. Besides the visual investigation, effluent was also analyzed to calculate the solvent cut and oil recovery. Next, the process was modeled numerically using a commercial compositional simulator and the saturation distribution in the matrix was matched to the experimental data. The key parameters in the matching process were the effective diffusion coefficients and the longitudinal and transverse dispersivities. The diffusion coefficients were specified for each fluid and dispersivities were assigned into grid blocks separately for the fracture and the matrix. Finally, glass etched microfluidic models were used to investigate pore scale interaction between the matrix and the fracture. The models were prepared by etching homogeneous and heterogeneous micro scale pore patterns on glass sheets bonded together and then saturated with colored n-decane as the oleic phase. CO2 was injected at miscible and immiscible conditions. The focus was on visual pore scale analysis of miscibility, breakthrough of CO2 and oil/CO2 transfer between the matrix and the fracture under different miscibility, injection rate and wettability conditions.
Language
English
DOI
doi:10.7939/R3ZB1C
Rights
License granted by Vahapcan Er (vahapcan@ualberta.ca) on 2009-05-06T23:21:27Z (GMT): Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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