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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 5 Variation of basic properties of SSDF based on HvL and LvH with hot-aging time.
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| Hot-aging time/h | 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 | 32
64
80
96 | 75.5
68.0
62.0
54.0 | 64
57
53
47 | 11.75
11.24
9.20
7.15 | 0.184
0.197
0.174
0.152 | 5/4
4/3
3/2
3/2 | 10.0
11.8
15.4
23.0 |
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