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Enhanced oil recovery mechanisms of polymer flooding in a heterogeneous oil reservoir
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LU Xiangguo,CAO Bao,XIE Kun,CAO Weijia,LIU Yigang,ZHANG Yunbao,WANG Xiaoyan,ZHANG Jie
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Table 1 Experimental schemes and development index data for flooding with different types of polymer solutions.
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| Scheme No. | Polymer
type | Polymer concentration/(mg?L-1) | Viscosity/
(mPa?s) | Oil saturation/% | Oil recovery/% | Water
flooding | Final
recovery | Recovery increase of
polymer flooding | | 1-1 | APP4 | 1750 | 351.3 | 73.0 | 26.9 | 41.2 | 14.3 | | 1-2 | CAB20 | 1750 | 289.5 | 72.8 | 26.7 | 42.6 | 15.9 | | 1-3 | HTPW | 1750 | 78.0 | 72.7 | 26.8 | 45.6 | 18.8 | | 1-4 | 3400 | 352.1 | 73.1 | 26.8 | 49.5 | 22.7 |
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