Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (3): 159-165.doi: 10.12108/yxyqc.20200315

• OIL AND GAS FIELD DEVELOPMENT • Previous Articles     Next Articles

Experiment on the mechanism of low salinity waterflooding in carbonate reservoir

QIAN Zhen1, LI Hui2, QIAO Lin3, BAI Sen1   

  1. 1. Reserch Institute of Engineering Technology, SINOPEC Northwest Company, Urumqi 830011, China;
    2. College of Earth Science and Resources, Chang'an University, Xi'an 710064, China;
    3. No.1 Gas Production Plant, SINOPEC Southwest Oil and Gas Company, Chengdu 610800, China
  • Received:2019-09-25 Revised:2020-02-06 Online:2020-05-21 Published:2020-04-30

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Abstract: Potential of low salinity waterflooding in carbonate reservoir is huge. To better promote its field application,experimental research on its mechanism was carried out. Firstly,core displacement experiment was conducted to study the influence of salinity and determining ions(PDIs) on oil recovery. Then,the influence of salinity and PDIs on wettability of carbonate rock was analyzed according to the contact angle experiments. Finally, the low salinity waterflooding mechanism of carbonate reservoir was established based on the experiment results. The results show that low salinity water can effectively change surface wettability,hence the oil recovery,and have optimum salinity to the highest oil recovery. The effects of Mg2+ and SO42- on wettability and recovery are different. With the increase of Mg2+,the wettability alteration increases and the oil recovery enhances. With the increase of SO42-,the wettability alteration increases first and then decreases,and the oil recovery increases first and then stabilizes. The mechanism of low salinity waterflooding in carbonate reservoirs is the wettability alteration which can be divided into two steps:(1) SO42- adsorbed on the positive carbonate minerals surface,neutralizing surface charges,promoting the movement of Mg2+ to the minerals surface;(2) Mg2+ substituted Ca2+ of carbonate minerals surface,resulting in the dissociation of crude oil.

Key words: carbonate reservoirs, low salinity waterflooding, potential determining ions, recovery factor, surface wettability, reaction mechanism

CLC Number: 

  • TE344
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