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Water-sensitive damage mechanism and the injection water source optimization of low permeability sandy conglomerate reservoirs
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WANG Lei,ZHANG Hui,PENG Xiaodong,WANG Panrong,ZHAO Nan,CHU Shasha,WANG Xinguang,KONG Linghui
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Table 5 Pore distribution of core samples flooded by water of different salinities.
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No. of
Core # | Injection water type | Movable fluid
saturation/% | Proportions of different pores/% |
|---|
| Micropores | Mesopores | Macropores |
|---|
| 3 | Formation water | 59.3 | 40.7 | 37.1 | 22.2 | | Water with salinity 1/2 times that of the formation water | 56.3 | 43.7 | 39.0 | 17.3 | | Distilled water | 56.0 | 44.0 | 41.0 | 14.9 | | 4 | Formation water | 55.2 | 44.8 | 47.8 | 7.4 | | Water with salinity 1/2 times that of the formation water | 51.0 | 49.0 | 46.3 | 4.7 | | Distilled water | 50.0 | 50.0 | 45.8 | 4.2 | | 5 | Formation water | 49.7 | 50.3 | 42.1 | 7.6 | | Water with salinity 2 times that of the formation water | 50.6 | 49.4 | 41.5 | 9.1 | | Water with salinity 3 times that of the formation water | 51.5 | 48.5 | 43.9 | 7.6 | | 6 | Formation water | 25.0 | 75.0 | 18.6 | 6.4 | | Water with salinity 2 times that of the formation water | 26.3 | 73.7 | 19.5 | 6.8 | | Water with salinity 3 times that of the formation water | 27.3 | 72.7 | 21.0 | 6.3 |
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