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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 7 Research scheme of slug comparison.
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| Research stage | No. of schemes | Water source | Injection schemes | | Slug 1 | Slug 2 | Slug 3 | Slug 4 | Slug 5 | Optimum ranges
of TDS and IS | 1# | Formation water | Formation water | 10 times dilution | 20 times dilution | 30 times dilution | / | | 2# | Seawater | Seawater | 2 times dilution | 4 times dilution | 6 times dilution | 8 times dilution | Verification of
preferred water | 3# | Formation water and seawater | Optimal dilution times of formation water | Optimal dilution times of seawater | | / | / |
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