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The biodiesel-based flat-rheology drilling fluid system
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JIANG Guancheng,SHI He,HE Yinbo
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Table 12. Anti-shale cuttings performance of biodiesel-based flat-rheology drilling fluid
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Shale cuttings
addition/% | Rheology test
temperature/°C | Apparent
viscosity/
(mPa·s) | Plastic
viscosity/
(mPa·s) | Yield point/
Pa | Φ6 | Φ3 | Initial gel
strength/
Pa | Final gel
strength/
Pa | Emulsion-
breaking
voltage/V | API
filtrate/
mL | HTHP filtrate/
mL | | 5 | 2 | 52 | 44 | 8.18 | 7 | 6 | 3.0 | 4.0 | 1 353 | 0.8 | 8.1 | | 30 | 43 | 36 | 7.15 | 7 | 6 | 3.0 | 3.5 | | 65 | 31 | 24 | 7.15 | 6 | 5 | 2.5 | 3.0 | | 10 | 2 | 58 | 49 | 9.20 | 9 | 8 | 4.0 | 5.0 | 1 138 | 1.8 | 11.4 | | 30 | 46 | 38 | 8.18 | 8 | 7 | 3.5 | 4.0 | | 65 | 37 | 30 | 7.15 | 7 | 6 | 3.0 | 3.5 | | 15 | 2 | 64 | 50 | 14.31 | 13 | 12 | 6.0 | 7.0 | 875 | 3.6 | 16.0 | | 30 | 52 | 41 | 11.24 | 10 | 9 | 4.5 | 5.0 | | 65 | 43 | 35 | 8.18 | 8 | 7 | 3.5 | 4.0 |
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