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Investigating the factors influencing recovery of asphaltenic oil by water and miscible CO{sub 2} flooding

Technical Report:

Abstract

Conclusions that may be drawn from this work on the influence of CO{sub 2}, temperature, pressure and water composition on the recovery of asphaltenic oil by water and CO{sub 2} flooding are as follows: Asphaltene is found to alter outcrop chalk wettability from water-wet to more oil wet, which influence oil recovery by miscible CO{sub 2} and water flooding. Modification of Hirschberg solubility model for predicting asphaltene deposition has been done to account for the effect of CO{sub 2} fraction in the liquid phase during miscible flooding. This is done based on data from this work and literature. This model made it possible to isolate the effect of CO{sub 2} fraction in liquid phase on asphaltene deposition during miscible flooding. Hence, determine the critical fraction of CO{sub 2} that initiate the asphaltene deposition. The critical fraction of CO{sub 2} is estimated to be between 17 to 42 mol percent (mol%), with 33 mol% as average value. A ternary diagram is developed and is based on solubility parameter ratio (S.P.R) and molar volume ratio (V{sub CO2}/V{sub L}) and their relation to asphaltene deposition using data from this work and literature. From this data, it may be suggested that S.P.R is a  More>>
Publication Date:
Sep 15, 2009
Product Type:
Technical Report
Report Number:
N-2009:71
Resource Relation:
Other Information: Doctoral theses at UIS; ISSN 1890-1387; Numerical Data; Thesis or Dissertation; TH: Thesis (Ph.D); refs., figs., tabs
Subject:
02 PETROLEUM; CARBONATE ROCKS; RESERVOIR ROCK; ENHANCED RECOVERY; RESIDUAL PETROLEUM; SOLUBILITY; SIMULATION; COMPUTERIZED SIMULATION; EXPERIMENTAL DATA
OSTI ID:
1010769
Research Organizations:
University of Stavanger. Stavanger (Norway)
Country of Origin:
Norway
Language:
English
Other Identifying Numbers:
Other: ISBN 978-82-7644-378-3; TRN: NO1105136
Availability:
Available from: University of Stavanger, Stavanger (Norway)
Submitting Site:
NW
Size:
vp.
Announcement Date:
Apr 11, 2011

Technical Report:

Citation Formats

Chukwudeme, Edwin Andrew. Investigating the factors influencing recovery of asphaltenic oil by water and miscible CO{sub 2} flooding. Norway: N. p., 2009. Web.
Chukwudeme, Edwin Andrew. Investigating the factors influencing recovery of asphaltenic oil by water and miscible CO{sub 2} flooding. Norway.
Chukwudeme, Edwin Andrew. 2009. "Investigating the factors influencing recovery of asphaltenic oil by water and miscible CO{sub 2} flooding." Norway.
@misc{etde_1010769,
title = {Investigating the factors influencing recovery of asphaltenic oil by water and miscible CO{sub 2} flooding}
author = {Chukwudeme, Edwin Andrew}
abstractNote = {Conclusions that may be drawn from this work on the influence of CO{sub 2}, temperature, pressure and water composition on the recovery of asphaltenic oil by water and CO{sub 2} flooding are as follows: Asphaltene is found to alter outcrop chalk wettability from water-wet to more oil wet, which influence oil recovery by miscible CO{sub 2} and water flooding. Modification of Hirschberg solubility model for predicting asphaltene deposition has been done to account for the effect of CO{sub 2} fraction in the liquid phase during miscible flooding. This is done based on data from this work and literature. This model made it possible to isolate the effect of CO{sub 2} fraction in liquid phase on asphaltene deposition during miscible flooding. Hence, determine the critical fraction of CO{sub 2} that initiate the asphaltene deposition. The critical fraction of CO{sub 2} is estimated to be between 17 to 42 mol percent (mol%), with 33 mol% as average value. A ternary diagram is developed and is based on solubility parameter ratio (S.P.R) and molar volume ratio (V{sub CO2}/V{sub L}) and their relation to asphaltene deposition using data from this work and literature. From this data, it may be suggested that S.P.R is a determining factor for asphaltene deposition during CO{sub 2} flooding, which is not unreasonable since it is influenced by the molar volume ratio, hence temperature, pressure and composition. It is interesting to see a linear relationship between asphaltene precipitation and pressure drop regardless of the flowing pressure at isothermal condition. This is tested for under-saturated fluids. Oil recovery by miscible CO{sub 2} flooding shows low ultimate oil recovery with increasing temperature and pressure for asphaltenic oil compared to non-asphaltenic. CO{sub 2} flooding is found to be plausible for asphaltenic reservoir at lower temperature (< 70 C). From simulation studies, EOR by CO{sub 2} initiated after at least three years of water injection show the benefit of miscible flooding. Water containing magnesium or sulfate ions has shown to alter modified oil- wet chalk to more water-wet which indicates their potential in improving oil recovery from asphaltenic oil reservoir. (Author)}
place = {Norway}
year = {2009}
month = {Sep}
}