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Title: Altering wettability to recover more oil from tight formations

We describe here a method for chemically modifying fracturing fluids and overflushes to chemically increase oil recovery from tight formations. Oil wetting of tight formations is usually controlled by adhesion to illite, kerogen, or both; adhesion to carbonate minerals may also play a role. Oil-illite adhesion is sensitive to salinity, dissolved divalent cation content, and pH. We measure oil-rock adhesion with middle Bakken formation oil and core to verify a surface complexation model of reservoir wettability. The agreement between the model and experiments suggests that wettability trends in tight formations can be quantitatively predicted and that fracturing fluid and overflush compositions can be individually tailored to increase oil recovery.
Authors:
 [1] ;  [1] ;  [2] ;  [3]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Science Based Solutions, Laramie, WY (United States)
  3. Statoil Gulf Services LLC, Houston, TX (United States)
Publication Date:
OSTI Identifier:
1259534
Report Number(s):
SAND--2015-9056J
Journal ID: ISSN 2213-3976; PII: S2213397616300192
Grant/Contract Number:
AC04-94AL85000
Type:
Accepted Manuscript
Journal Name:
Journal of Unconventional Oil and Gas Resources
Additional Journal Information:
Journal Volume: 15; Journal Issue: C; Journal ID: ISSN 2213-3976
Publisher:
Elsevier
Research Org:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
04 OIL SHALES AND TAR SANDS