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Simulation Study of Steam-Solvent Phase Behaviour in Solvent Aided SAGD Process and Its Effect on Oil Recovery

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ucalgary_2014_ji_dongqi.pdf (3.195Mb)
Advisor
Dong, Mingzhe
Author
Ji, Dongqi
Accessioned
2014-01-30T18:09:42Z
Available
2014-03-15T07:00:20Z
Issued
2014-01-30
Submitted
2014
Other
SAGD
Solvent
Phase Behaviour
Mass transfer
Subject
Engineering--Petroleum
Type
Thesis
Metadata
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Abstract
In solvent aided Steam-Assisted Gravity Drainage (SAGD), steam-solvent injection, which is a different process from that of a pure-steam process, significantly affects the steam-solvent phase behavior near the vapor-liquid interface. In this thesis, the phase behavior of the steam-solvent-bitumen system is studied in detail through simulation. It is discovered that solvent is dissolved in oil by gas-oil equilibrium near the vapor-liquid interface, rather than the mixing of bitumen and solvent condensate. The dissolved solvent is convectively delivered to the oil sand through the gravity drainage process, rather than the process of diffusion or dispersion. The effects of the solvent injection concentration and injection pressure on steam-solvent-bitumen behavior are analyzed. In addition, this study proposes a steam-solvent injection strategy to improve solvent aided SAGD performance through analysis of solvent concentration, pressure, solvent-type and solvent injection start time.
Corporate
University of Calgary
Faculty
Graduate Studies
Doi
http://dx.doi.org/10.11575/PRISM/27788
Uri
http://hdl.handle.net/11023/1348
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