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Super-amphiphobic, strong self-cleaning and high-efficiency water-based drilling fluids
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JIANG Guancheng,NI Xiaoxiao,LI Wuquan,QUAN Xiaohu,LUO Xuwu
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Table 3 Effects of different reservoir protectants on recovery of core permeability.
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| Formula | Agent | Porosity/
% | Initial permeability/
10-3 μm2 | Permeability after polluted by drilling fluid/10-3 μm2 | Recovery rate of permeability/% | Pollution
depth/cm | | 1 | No agent added | 5.47 | 5.47 | 3.88 | 70.93 | 00.95 | | 2 | Non-filtration protectant | 5.87 | 5.33 | 4.47 | 83.86 | 00.60 | | 2 | Film-forming protectant | 5.96 | 5.28 | 4.45 | 84.28 | 00.60 | | 2 | S-A | 5.91 | 4.96 | 4.68 | 94.35 | 00.45 |
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