Research Article
Study on the Key Influential Factors on Water Huff-n-Puff in Ultralow-Permeability Reservoir
Table 4
Dynamic imbibition experimental results of cores with different fracture lengths.
| | Core number | Core basic information | Oil recovery | | Core permeability (10-3 μm2) | Core length (cm) | Relative wettability index | Fracture length (cm) | First round (%) | Second round (%) | Third round (%) | Fourth round (%) | Final recovery (%) |
| | 4-1 | 1.4 | 9.9 | 0.80 | 3 | 11.8 | 10.2 | 8.7 | 6.3 | 37.0 | | 4-2 | 1.6 | 9.8 | 0.75 | 6 | 13.3 | 11.3 | 10.5 | 9.2 | 44.3 | | 4-3 | 1.4 | 100 | 0.75 | 10 | 15.6 | 12.8 | 10.8 | 9.4 | 48.6 |
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