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Mechanism of shales stabilization by hydrophobized poly(ethylene glycol)/K+ in water-base drilling fluids
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VILLABONA-ESTUPIÑAN Santiago,de ALMEIDA RODRIGUES JUNIOR Jorge,de ABREU Carolina Ferreira,NASCIMENTO Regina Sandra Veiga
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Table 5. Values of the properties evaluated in WBDF before and after aging.
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| Water-base drilling fluids | Status | Performance | | Total recovered cuttings percentage/% | Intact recovered cuttings percentage/% | Apparent viscosity/ (mPa•s) | Plastic viscosity/ (mPa•s) | Yield point/Pa | Initial gel strength/Pa | Final gel strength/Pa | Density/ (g•cm-3) | pH | API fluid loss/mL | Friction factor | | BF | Before aging | | | 34.5 | 20 | 14.5 | 10 | 11.5 | 1.07 | 10.5 | 3.0 | 0.32 | | F1 | | | 29.0 | 14 | 15.0 | 6.0 | 8.0 | 1.05 | 10.4 | 2.1 | 0.19 | | F2 | | | 38.0 | 18 | 20.0 | 7.5 | 8.5 | 1.09 | 10.2 | 2.0 | 0.18 | | F3 | | | 32.0 | 16 | 16.0 | 6.0 | 7.5 | 1.04 | 10.1 | 2.1 | 0.20 | | BF | After aging | 4.9 | 0 | 54.5 | 26 | 28.5 | 11.0 | 13.0 | 1.10 | 10.5 | 2.4 | 0.34 | | F1 | 80.2 | 71.5 | 35.0 | 17 | 18.0 | 6.5 | 8.0 | 1.10 | 10.2 | 2.0 | 0.19 | | F2 | 91.3 | 84.1 | 45.0 | 22 | 23.0 | 7.5 | 9.0 | 1.13 | 10.0 | 1.8 | 0.19 | | F3 | 99.2 | 89.9 | 36.0 | 18 | 18.0 | 6.5 | 7.5 | 1.08 | 10.0 | 1.9 | 0.20 |
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