Research Article
Study on the Key Influential Factors on Water Huff-n-Puff in Ultralow-Permeability Reservoir
Table 6
Statistical results of water huff-n-puff in the oilfield.
| | Types | Construction wells | Effective wells | Efficiency (%) | Effective period (t/d) | Initial oil increasing (t/d) | Period oil increasing (t) | Back production efficiency (%) |
| | Water huff-n-puff | 26 | 23 | 88.5 | 152 | 7.5 | 712 | 7.5 | | Water huff-n-puff+ fracturing | 12 | 12 | 100.0 | 246 | 10.3 | 1231 | 2.1 | | Total/average | 38 | 35 | 92.1 | 199 | 8.9 | 972 | 4.8 |
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