Please enable JavaScript for this site to function properly.
OnePetro
  • Help
  • About us
  • Contact us
Menu
  • Home
  • Journals
  • Conferences
  • Log in / Register

Log in to your subscription

and
Advanced search Show search help
  • Full text
  • Author
  • Company/Institution
  • Publisher
  • Journal
  • Conference
Boolean operators
This OR that
This AND that
This NOT that
Must include "This" and "That"
This That
Must not include "That"
This -That
"This" is optional
This +That
Exact phrase "This That"
"This That"
Grouping
(this AND that) OR (that AND other)
Specifying fields
publisher:"Publisher Name"
author:(Smith OR Jones)

Direct Experimental Evidence of Wettability Modification By Low Salinity

Authors
S. Berg (Shell International Exploration and Production) | A.W. Cense (Shell International Exploration and Production) | E. Jansen (Technische Hogeschool Rijswijk) | K. Bakker (Technische Hogeschool Rijswijk)
Document ID
SPWLA-2010-v51n5a3
Publisher
Society of Petrophysicists and Well-Log Analysts
Source
Petrophysics
Volume
51
Issue
05
Publication Date
October 2010
Document Type
Journal Paper
Language
English
ISSN
1529-9074
Copyright
2010. Society of Petrophysicists & Well Log Analysts
Downloads
3 in the last 30 days
1,055 since 2007
Show more detail
Price: USD 10.00
ABSTRACT:

It has been observed by several parties in the past years that injection of low salinity water leads to the production of additional oil compared to injection of water at reservoir salinity or higher. While this process is already applied in the field, so far the microscopic mechanism is not fully clear. A mechanism proposed by several researchers is that low salinity water leads to a wettability change of the sandstone rock, which then causes release of oil that previously was attached mostly to clay minerals. So far all experimental evidence for this mechanism is macroscopic and indirect, i.e. in the form of an increase in produced oil. The main motivation for this study is to provide direct evidence and to directly visualize detachment of crude oil from clay minerals. In a small lab scale experimental study in a flow cell we observed the release of crude oil from a substrate covered with solidly attached clay particles when changing the brine from high salinity to low salinity. For very low salinity we observed a massive release of crude oil (up to 80%) but also a decomposition of the Montmorillonite clay minerals and release of fines (formation damage). For a brine composition with somewhat higher salinity and in addition presence of divalent ions, we observed release of oil but only insignificant amount of clay swelling (“controlled formation damage”).



INTRODUCTIONThe concept of injecting low salinity water into an oil reservoir is not a new topic. Jadhunandan (1990) has shown that injection of brine can lead to improvement of oil recovery in sandstone oil reservoirs. Webb et al. (2004) and Seccombe et al. (2008) have demonstrated the effect in the laboratory and in field tests. Initially, the mechanism was not very clear. Lager et al. (2008) give a very comprehensive overview of the historical development of a deeper understanding of the effect. Since the effect occurred on sandstone but not in fired or acidized sandstones, Tang and Morrow (1996) and Lager et al. (2006) concluded that the effect is related to the presence of clays. Lager et al. (2006) give a comprehensive overview of the different mechanisms including the most relevant bibliography. Lager et al. (2006, 2008) warn that some of the above listed mechanisms are rather effects than causes like pH induced IFT reduction, which has been ruled out as cause by Ligthelm et al. (2009). In Lager et al. (2006) and most of the other studies, the effects of low salinity flooding are studied in core flooding experiments where observations are indirect via an increase of oil production in a recovery curve. Many microscopic mechanisms would be seen macroscopically from a reservoir engineering perspective as wettability modification. Jerauld et al. (2006) argue that the effect of low salinity flooding on a recovery curve can then be modeled as a modification of the relative permeability and Maas et al. (2001) had already proposed a modification of the capillary pressure saturation functions.
File Size  1 MBNumber of Pages   9
    • Issue 05
    • Issue 04
    • Issue 03
    • Issue 02
    • Issue 01
    • Issue 06
    • Issue 05
    • Issue 04
    • Issue 03
    • Issue 02
    • Issue 01
    • Issue 06
    • Issue 05
    • Issue 04
    • Issue 03
    • Issue 02
    • Issue 01
    • Issue 06
    • Issue 05
    • Issue 04
    • Issue 03
    • Issue 02
    • Issue 01
    • Issue 06
    • Issue 05
    • Issue 04
    • Issue 03
    • Issue 02
    • Issue 01
    • Issue 06
    • Issue 05
    • Issue 04
    • Issue 03
    • Issue 02
    • Issue 01
    • Issue 06
    • Issue 05
    • Issue 04
    • Issue 03
    • Issue 02
    • Issue 01
    • Issue 06
    • Issue 05
    • Issue 04
    • Issue 03
    • Issue 02
    • Issue 01
    • Issue 06
    • Issue 05
    • Issue 04
    • Issue 03
    • Issue 02
    • Issue 01
    • Issue 06
    • Issue 05
    • Issue 04
    • Issue 03
    • Issue 02
    • Issue 01
    • Issue 06
    • Issue 05
    • Issue 04
    • Issue 03
    • Issue 02
    • Issue 01
    • Issue 06
    • Issue 05
    • Issue 04
    • Issue 03
    • Issue 02
    • Issue 01
    • Issue 06
    • Issue 05
    • Issue 04
    • Issue 03
    • Issue 02
    • Issue 01
    • Issue 06
    • Issue 05
    • Issue 04
    • Issue 03
    • Issue 02
    • Issue 01
    • Issue 06
    • Issue 05
    • Issue 04
    • Issue 03
    • Issue 02
    • Issue 01
    • Issue 06
    • Issue 05
    • Issue 04
    • Issue 03
    • Issue 02
    • Issue 01
    • Issue 06
    • Issue 05
    • Issue 04
    • Issue 03
    • Issue 02
    • Issue 01
    • Issue 06
    • Issue 05
    • Issue 04
    • Issue 03
    • Issue 02
    • Issue 01
    • Issue 06
    • Issue 05
    • Issue 04
    • Issue 03
    • Issue 02
    • Issue 01
    • Issue 06
    • Issue 05
    • Issue 04
    • Issue 03
    • Issue 02
    • Issue 01
Show more

Other Resources

Looking for more? 

Some of the OnePetro partner societies have developed subject- specific wikis that may help.


 


PetroWiki was initially created from the seven volume  Petroleum Engineering Handbook (PEH) published by the  Society of Petroleum Engineers (SPE).








The SEG Wiki is a useful collection of information for working geophysicists, educators, and students in the field of geophysics. The initial content has been derived from : Robert E. Sheriff's Encyclopedic Dictionary of Applied Geophysics, fourth edition.

  • Home
  • Journals
  • Conferences
  • Copyright © SPE All rights reserved
  • About us
  • Contact us
  • Help
  • Terms of use
  • Publishers
  • Content Coverage
  • Privacy
  Administration log in