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Title: Thin liquid films in improved oil recovery from low-salinity brine

Low-salinity waterflooding is a relatively new method for improved oil recovery that has generated much interest. It is generally believed that low-salinity brine alters the wettability of oil reservoir rocks towards a wetting state that is optimal for recovery. The mechanism(s) by which the wettability alteration occurs is currently an unsettled issue. This study reviews recent studies on wettability alteration mechanisms that affect the interactions between the brine/oil and brine/rock interfaces of thin brine films that wet the surface of reservoir rocks. Of these mechanisms, we pay particular attention to double-layer expansion, which is closely tied to an increase in the thickness and stability of the thin brine films. Our review examines studies on both sandstones and carbonate rocks. We conclude that the thin-brine-film mechanisms provide a good qualitative, though incomplete, picture of this very complicated problem. Finally, we give suggestions for future studies that may help provide a more quantitative and complete understanding of low-salinity waterflooding.
Authors:
 [1] ;  [2]
  1. Yale Univ., New Haven, CT (United States). Dept. of Chemical and Environmental Engineering; Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Yale Univ., New Haven, CT (United States). Dept. of Chemical and Environmental Engineering; Reservoir Engineering Research Inst., Palo Alto, CA (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-666279-DRAFT
Journal ID: ISSN 1359-0294
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Current Opinion in Colloid & Interface Science
Additional Journal Information:
Journal Volume: 20; Journal Issue: 2; Journal ID: ISSN 1359-0294
Publisher:
Elsevier
Research Org:
Yale Univ., New Haven, CT (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 58 GEOSCIENCES; 02 PETROLEUM; low-salinity; waterflood; LSW; brine; double-layer; sandstone; carbonate; film
OSTI Identifier:
1251044
Alternate Identifier(s):
OSTI ID: 1250991