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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 3 Experimental schemes and development index data of different injection modes.
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Scheme
No. | Injection mode | Viscosity/
(mPa?s) | Oil
saturation/% | Oil recovery/% | | Waterflooding | Final recovery | Increase | | 3-1 | Whole slug of polymer solution | 5.9 | 64.07 | 32.79 | 39.07 | 6.28 | | 3-2 | Whole slug of gel solution | 5.5 | 64.48 | 32.72 | 41.06 | 8.34 | | 3-3 | Alternative slugs of gel solution and water | 5.5 | 65.53 | 32.93 | 44.58 | 11.65 |
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