Drilling fluid properties containing different filtrate loss reducers before and after the aging process.
| Test samples | AV (mPa s) | PV (mPa s) | YP (Pa) | FLAPI (mL) | ||||
|---|---|---|---|---|---|---|---|---|
| Before aging | After aging | Before aging | After aging | Before aging | After aging | Before aging | After aging | |
| 1 wt% comb-shaped copolymera | 17.0 | 12.5 | 12 | 9 | 5.0 | 3.5 | 7.8 | 9.4 |
| 1 wt% NS-1a | 16.5 | 13.0 | 11 | 9 | 4.5 | 4.0 | 9.4 | 19.2 |
| 0.4 wt% PACa | 26.5 | 20.5 | 21 | 18 | 5.5 | 3.0 | 10.8 | 17.4 |
| 3% SMPb | 5.5 | 7.5 | 5 | 6 | 0.5 | 1.5 | 23 | 45.0 |
| 3% SMCb | 8.5 | 5.5 | 7 | 4.5 | 2.5 | 1.0 | 16.8 | 30.0 |
| 3% SMP + 3% SMCa | 9.5 | 28.0 | 8 | 20 | 1.5 | 13.0 | 4.2 | 7.4 |
a
200 °C aging process.
b
120 °C aging process.