Research Article
Study on Damage Mechanism of Waterflooding Development in Weizhou 11-4N Low-Permeability Oilfield
Table 3
Experimental results of velocity sensitivity, water sensitivity and salt sensitivity in the Weizhou 11-4N oilfield.
| Type of experiment | Sample number | Well depth (m) | Lithology | Damage rate (%) | Damage assessment |
| Speed sensitivity | A1 | 2208.53 | Sandstones | 96.68 | Strong | Speed sensitivity | A2 | 2209.17 | Sandstones | 1455.77 | Strong | Speed sensitivity | A3 | 2086.76 | Sandstones | 133.36 | Strong | Speed sensitivity | A4 | 2171.89 | Sandstones | 39.05 | Moderately weak | Water sensitivity | B1 | 2087.67 | Sandstones | 36.6 | Moderately weak | Water sensitivity | B2 | 2086.79 | Sandstones | 78.89 | Strong | Water sensitivity | B3 | 2209.41 | Sandstones | 33.04 | Moderately weak | Water sensitivity | B4 | 2092.31 | Sandstones | 32.79 | Moderately weak | Water sensitivity | B5 | 2088.73 | Sandstones | 41.27 | Moderately weak | Water sensitivity | B6 | 2087.49 | Sandstones | 29.75 | Weak | Water sensitivity | B7 | 2209.58 | Sandstones | 13.51 | Weak | Salt sensitivity | C1 | 2209.04 | Sandstones | 89.11 | Strong | Salt sensitivity | C2 | 2230.7 | Sandstones | 48.92 | Moderately weak | Salt sensitivity | C3 | 2221.84 | Sandstones | / | None | Salt sensitivity | C4 | 2225.38 | Sandstones | 35.35 | Moderately weak |
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