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Effects of pore structure on surfactant/polymer flooding-based enhanced oil recovery in conglomerate reservoirs
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LIU Zheyu,LI Yiqiang,LENG Runxi,LIU Zhenping,CHEN Xin,HEJAZI Hossein
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Table 5 Oil recovery contribution of different grades of pores during water flooding and SP flooding.
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| Pore grade | Contribution to total oil recovery/% | | Number | Radius/μm | Unimodal | Bimodal | Multimodal | | Water | SP | Water | SP | Water | SP | | Grade Ⅰ | <1 | 14.82 | 7.36 | 13.48 | 12.83 | -3.63 | 12.89 | | Grade Ⅱ | [1, 3) | 26.13 | 30.59 | 19.28 | 20.05 | 15.01 | 10.61 | | Grade Ⅲ | [3, 7] | 31.40 | 30.22 | 28.53 | 23.78 | 9.60 | 11.74 | | Grade Ⅳ | >7 | 27.65 | 31.82 | 38.71 | 43.34 | 79.01 | 64.75 |
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