Table 2 Effect of methane gas invasion on the rheological properties of efield drilling fluid containing surfactant.
System | Gas injection time/ min | AV (mPa·s) | PV (mPa·s) | YP (Pa) | Gel (Pa/Pa) | Ρ (g/cm3) |
|---|---|---|---|---|---|---|
On-site environmentally friendly water-based drilling fluid + 0.1% AT920 (ρ = 1.85 g/cm3) | 0 | 99 | 85 | 14 | 3.5/8 | 1.85 |
5 | 100.5 | 86 | 14.5 | 4/8 | 1.85 | |
10 | 98 | 85 | 13 | 3/7.5 | 1.85 | |
20 | 100 | 86 | 14 | 4/8.5 | 1.85 | |
30 | 101 | 88 | 13 | 4/8 | 1.85 |
