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A saturated saltwater drilling fluid based on salt-responsive polyampholytes
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JIANG Guancheng,HE Yinbo,CUI Wuge,YANG Lili,YE Chenxi
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Table 7 Tolerance of SSDF based on HvL and LvH to shale cutting (after hot-aging).
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| Contamination quantity/% | Apparent viscosity/(mPa·s) | Plastic viscosity/(mPa·s) | Yield point/Pa | Dynamic plastic ratio/(Pa·(mPa·s)-1) | Φ6/Φ3 | Fluid loss under high temperature and pressure/mL | 0
10
20
30 | 79
82
89
100 | 66
69
75
84 | 13.29
13.29
14.31
16.35 | 0.201
0.192
0.191
0.195 | 5/4
5/4
6/5
9/7 | 8.0
8.2
10.3
13.2 |
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