Lithologic Reservoirs ›› 2012, Vol. 24 ›› Issue (2): 106-110.doi: 10.3969/j.issn.1673-8926.2012.02.021

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Research advance and prospect of low salinity water flooding

WANG Ping1， JIANG Ruizhong1，WANG Gongchang1， LIANG Yu2   

  1. 1. College of Petroleum Engineering， China University of Petroleum， Qingdao 266580， China； 2. University of Wyoming， Laramie 82071， USA
  • Online:2012-04-20 Published:2012-04-20

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Abstract:

Aiming at the current status that low salinity water flooding has been applied to pilot test abroad while in China there is little research, this paper analyzed the current research status and existing problems, and proposed prospects for low salinity water flooding. It is concluded that for sand reservoirs, the main mechanisms of low salinity water flooding are similar to alkaline flooding, fines migration and the wettability alteration caused bymulti-component ion exchange, while for carbonate reservoirs, the mechanismof lowsalinitywater flooding is wettability alteration caused bymulti-component ion exchange. Crude oil properties, reservoir rock properties, formation and injected water salinity and reservoir temperature can all influence the effects of low salinity water flooding. The main problems lie in the unclear mechanisms, low salinity water source limitation and reservoir adaptability. Finally, it is pointed out that low salinity water flooding can be combined with current oilfield development techniques, coal bed methane production techniques, development techniques for low permeability oilfield and high water-cut oilfield, which will form new economical, environmental-friendly and great potential techniques for enhanced oil recovery.

Key words: reservoir characteristics, sedimentation, diagenesis, YanchangFormation, Nanliang area, Ordos Basin

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