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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 9 Main ion composition of two kinds of optimized water.
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| Type of water | Number | Na+/
(mg?L-1) | K+/
(mg?L-1) | Ca2+/
(mg?L-1) | Mg2+/
(mg?L-1) | Cl-/
(mg?L-1) | SO42-/
(mg?L-1) | TDS/
(mg?L-1) | IS/
(mol?L-1) | Formation water
diluted 20 times | 1 | 2 352 | 85.4 | 400.0 | 97.2 | 5 000.0 | 18.0 | 8 000 | 0.15 | Seawater diluted
6 times | 2 | 2 750 | 0 | 146.7 | 231.8 | 4 331.4 | 536.2 | 8 000 | 0.16 |
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