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Permanent link (DOI): https://doi.org/10.7939/R3SD51

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Effect of viscoelasticity and alkali on heavy oil EOR performance using HPAM, 'AA-NVP' co- and cross-linked polymers Open Access

Descriptions

Other title
Subject/Keyword
HPAM
Acrylic Acid
Viscoelasticity
N-Vinyl-2-Pyrrolidinone
Alkali
Enhanced Oil Recovery
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Doda, Ankit
Supervisor and department
Trivedi, Japan J (Department of Civil and Environmental Engineering)
Examining committee member and department
Trivedi, Japan J (Department of Civil and Environmental Engineering)
Kuru, Ergun (Department of Civil and Environmental Engineering)
Yeung, Tony (Department of Chemicals and Materials Engineering)
Department
Department of Civil and Environmental Engineering
Specialization
Petroleum Engineering
Date accepted
2014-01-31T11:43:11Z
Graduation date
2014-06
Degree
Master of Science
Degree level
Master's
Abstract
Polymer solutions are characterized based on their viscoelasticity to improve the displacement efficiency for enhanced oil recovery. Contribution of viscoelastic polymers solution’s elasticity on oil recovery needs to be analyzed thoroughly for better screening of polymers for field operations. In this work, the individual effect of the elasticity of polymers (hydrolyzed polyacrylamide) on oil recovery, and residual resistance factor (RRF) was determined for secondary polymer flood oil recovery experiments with varying degree of water saturation. HPAM solutions, having identical shear viscosity but different elasticity, were analyzed. A series of flooding experiments were performed using a cylindrical core (simulating linear flow) sand pack saturated with heavy oil for different blends of HPAM. Results show that although polymer solutions with higher elasticity yield higher oil recovery, but they have high RRF values. Also, if the water saturation is high before polymer flooding, this elasticity behavior is prominent. The injectivity and hydrolysis of HPAM in severe alkaline conditions is a major challenge for oil industry. It is of great importance that injected polymer or micro gels show higher injectivity and alkali resistance behavior without compromising with the amount of oil recovered. To overcome shortfall of conventional HPAM, new crosslinked (cP(AA-st-NVP)) and co (P(AA-co-NVP) polymer were synthesized using Acrylic Acid (AA) and N-vinyl-2-pyrrolidinone (NVP), and N,N’-methylenebisacrylamide as a crosslinking agent by free radical polymerization. These newly synthesized polymers were compared for rheology, heavy oil recovery, injectivity, RRF value with high molecular weight HPAM in alkaline and non-alkaline conditions. Crosslinked polymer and co-polymer showed stable viscoelastic properties in alkaline conditions than conventional HPAM due to intermolecular bonding, though the molecular weight for the later was high. The RF(resistance factor) and RRF for crosslinked polymer were much lower than HPAM, suggesting high injectivity and lower adsorption/retention of the crosslinked and co polymer. The overall recovery of heavy oil using cross linked polymer and copolymer was also ~7% higher than HPAM.
Language
English
DOI
doi:10.7939/R3SD51
Rights
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 these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before 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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