Mechanisms of Low Salinity Waterflooding Enhanced Oil Recovery#br#
and Its Application

doi:10.11885/j.issn.1674-5086.2013.11.04.06

Abstract

Abstract:

To explain the reasons why low salinity injection water enhance oil recovery，the low salinity waterflooding is studied
thoroughly. Literatures，laboratory and oilfield experimental data are investigated，and research results prove that the main
reasons for improved oil recovery by low salinity are clay migration and wettability alteration，its main mechanisms including
fine migration，multi-component ionic exchange，cation exchange，multication bridging，electrical diffuse double layers expansion，
pH variation，oil-water mobility ratio reduction，salting effect，rock cement dissolution and so on；all mechanisms
work collaboratively to improve oil recovery，but some mechanisms may be absent and some mechanisms are the main factors
of enhanced oil recovery because of the different oilfield conditions. If the reasonable low salinity is controlled，there are about
5%~20% improvement of oil recovery. Low salinity waterflooding has become an attractive enhanced oil recovery method
as it shows more advantages than conventional chemical EOR methods in terms of low costs，low environmental pollution
and comparatively easier procedures. This technology is also applicable to onshore and offshore oilfields，which reveals the
potential in oilfield development.

Key words: low salinity, enhanced oil recovery, fine migration, ionic exchange, interfacial tension

CLC Number:

TE311

Wu Jian1，2*, Chang Yuwen1, Li Jia1, Liang Tao1, Guo Xiaofei1. Mechanisms of Low Salinity Waterflooding Enhanced Oil Recovery#br# and Its Application[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2013.11.04.06.

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Mechanisms of Low Salinity Waterflooding Enhanced Oil Recovery#br# and Its Application

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