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Mechanisms and experimental research of ion-matched waterflooding to enhance oil recovery in carbonate reservoirs: A case of Cretaceous limestone reservoirs in Halfaya Oilfield, Middle East
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PENG Yingfeng,LI Yiqiang,ZHU Guangya,PAN Deng,XU Shanzhi,WANG Xiuyu
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Table 5 Treatment methods of different water sources.
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| Water source | Method | Formation
water | Dilute 10,20...60 times | | Seawater | Dilute 2,4...10 times, | | River water | Dilute 2 times, IS=0.02 mol/L | Add NaSO4 to IS=0.05 mol/L,
salinity is about 2500 mg/L
at this point, | Add NaSO4 and CaCl2 to
IS=0.09 mol/L, salinity is about
3000 mg/L at this point |
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