Research Article
Copolymer SJ-1 as a Fluid Loss Additive for Drilling Fluid with High Content of Salt and Calcium
Table 4
Performance evaluation of calcium resistance of drilling fluid under high temperature.
| Experimental conditions | CaCl2 concentration /wt% | AV /mPa·s | PV /mPa·s | YP /Pa | API filter loss /mL |
| Aging temperature 120°C, aging time 16 h | 0.0 | 32.0 | 27.5 | 4.60 | 10.6 | 2.0 | 9.5 | 9.0 | 0.51 | 26.0 | 4.0 | 10.0 | 9.0 | 1.02 | 19.0 | 6.0 | 9.0 | 8.0 | 1.02 | 17.0 | 8.0 | 8.5 | 8.0 | 0.51 | 12.6 | 10.0 | 8.5 | 8.0 | 0.51 | 12.0 |
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