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Table 1 Experiments with their measured initial and final pH-values

From: Evaluating efficiency and stability of calcite scaling inhibitors at high pressure and high temperature in laboratory scale

Measurement conditions Inhibitor concentration (ppm) Initial pH-value Final pH-value ΔpH
HPHT 0 10.00 8.47 − 1.53
HPHT 10 10.12 9.21 − 0.91
HPHT 25 9.95 9.29 − 0.66
HPHT 50 10.10 9.57 − 0.53
HPHT 100 9.48 9.03 − 0.45
Ambient 0 8.96 7.73 − 1.23
Ambient 2 9.11 8.77 − 0.34
Ambient 5 8.93 8.82 − 0.11
Ambient 10 9.14 9.05 − 0.09