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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 3 Experimental evaluation parameters of oil displacement experiments with water of different salinities.
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No. of
Core | Type of injection water | Degree of water
free recovery/% | Oil displacement efficiency/% | Movable oil
saturation/% | Global mobility/
[(10-3 μm2)·(mPa·s) -1] | Productivity index/
[(10-3 μm2)·(mPa·s) -1] |
|---|
| 1 | Formation water | 21.6 | 40.2 | 19.8 | 85.4 | 16.9 | Water with salinity 1/2 times
of the formation water | 15.3 | 30.3 | 14.9 | 43.6 | 6.5 | | Distilled water | 12.5 | 23.2 | 11.4 | 32.0 | 3.6 | | 2 | Formation water | 22.3 | 31.7 | 14.0 | 1 006.5 | 140.7 | Water with salinity 2 times
of the formation water | 25.9 | 33.9 | 15.0 | 1 437.4 | 215.0 | Water with salinity 3 times
of the formation water | 21.4 | 36.2 | 16.0 | 500.5 | 80.0 |
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