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 conditionsCaCl2 concentration
/wt%
AV
/mPa·s
PV
/mPa·s
YP
/Pa
API filter loss
/mL

Aging temperature 120°C, aging time 16 h0.032.027.54.6010.6
2.09.59.00.5126.0
4.010.09.01.0219.0
6.09.08.01.0217.0
8.08.58.00.5112.6
10.08.58.00.5112.0