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Synchronous injection-production energy replenishment for a horizontal well in an ultra-low permeability sandstone reservoir: A case study of Changqing oilfield in Ordos Basin, NW China
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WANG Jing,LIU Jungang,LI Zhaoguo,LI Hongchang,ZHANG Jiaosheng,LI Wenqing,ZHANG Yuanli,PING Yi,YANG Huanying,WANG Ping
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Table 2 Statistics on daily water injection rate of water injection wells in some ultra-low permeability sandstone reservoirs of Changqing oilfield.
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| Block | Average permeability/10-3 μm2 | Daily water injection rate/m3 | Stable production time/a | Average daily oil production/t | | Z211 | 0.22 | 10-15 | 7 | 2.6 | | Y284 | 0.38 | 10-14 | 5 | 2.8 | | M30 | 0.79 | 10-15 | 7 | 3.0 |
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