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A high salt tolerance and low adsorption drag reducer based on non-covalent enhancement
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MA Yingxian,ZHU Zhi,GUO Jianchun,ZHOU Han,LI Jia,XIONG Yujia,MA Leyao
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Table 6 Results of permeability damage tests of different drag reducers to shale core.
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| Core No. | Drag reducer | Mass
fraction/% | Permeability/10-3 μm2 | Damage rate/% | Before
damage | After
damage | | 1 | Inverse-emulsion
drag reducer | 0.10 | 1.18 | 0.40 | 66.10 | | 2 | DN drag reducer | 0.10 | 5.87 | 5.85 | 0.34 | | 3 | Inverse-emulsion
drag reducer | 0.20 | 0.91 | 0.29 | 68.13 | | 4 | DN drag reducer | 0.20 | 1.82 | 1.67 | 8.24 | | 5 | Inverse-emulsion
drag reducer | 0.20 | 7.15 | 2.32 | 66.61 | | 6 | DN drag reducer | 0.20 | 5.41 | 5.03 | 7.02 |
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