Table 2 Dial readings, gel strength at 10 s. and 10 min., plastic viscosity, apparent viscosity, and yield point for OBMs at 25 °C and ambient pressure after ageing at 150 °C for 16 h.
From: Organically modified layered magnesium silicates to improve rheology of reservoir drilling fluids
Shear rate | Dial readings | ||
|---|---|---|---|
OBM1 | OBM2 | OBM3 | |
600 rpm | 63.8 | 69.1 | 71.2 |
300 rpm | 43.2 | 44.5 | 45.6 |
200 rpm | 33.8 | 34.1 | 34.8 |
100 rpm | 26.3 | 27.8 | 28.5 |
6 rpm | 14 | 13.8 | 14.2 |
3 rpm | 12.3 | 11.9 | 12.4 |
Rheological properties | |||
Gel strength 10 s., lb/100 ft2 | 13 | 12.5 | 13.2 |
Gel strength 10 min., lb/100 ft2 | 15.2 | 14.8 | 15.6 |
PV, cP | 20.6 | 24.6 | 25.6 |
AV, cP | 31.9 | 34.55 | 35.6 |
YP, lb/100 ft2 | 22.6 | 19.9 | 20 |
