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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 4 Basic information of profile control and flooding test wells.
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| Well group | Injection
round | Beginning time/
(Year-month) | Ending time/
(Year-month) | Weak gel injection volume/m3 | Injected pore
volume | Cumulative
oil increment//m3 | | B17 | 1 | 2008-06 | 2009-11 | 59 956 | 0.013 0 | 15 829 | | 2 | 2011-05 | 2013-05 | 58 964 | 0.012 8 | 20 506 | | 3 | 2013-07 | 2014-10 | 51 783 | 0.011 3 | 10 531 | | 4 | 2014-12 | 2016-04 | 53 749 | 0.011 7 | 6 582 | | 5 | 2016-10 | 2017-11 | 32 896 | 0.007 2 | 12 617 | | B06 | 1 | 2013-07 | 2014-12 | 41 911 | 0.032 2 | 2 964 | | 2 | 2015-01 | 2016-02 | 32 388 | 0.024 9 | 3 889 | | 3 | 2016-10 | 2017-11 | 14 277 | 0.011 0 | 9 667 | | B20m | 1 | 2013-07 | 2014-10 | 50 950 | 0.063 7 | 4 317 | | 2 | 2015-01 | 2016-02 | 44 792 | 0.056 0 | 7 755 | | 3 | 2016-10 | 2017-11 | 18 911 | 0.023 6 | 2 411 |
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