Open AccessTemperature Effect of Phosphonate-based Scale Inhibitors on Calcium Sulfate Scale in a High Salinity Environment
Author(s) -
Jin Hou,
T. Chen,
Mideok Han,
Mohammed Bataweel
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/690/1/012014
Subject(s) - phosphonate , sulfate , calcium , chemistry , salinity , precipitation , inorganic chemistry , biochemistry , organic chemistry , geology , meteorology , physics , oceanography
Calcium sulfate scale is one of the major scales causing lots of serious operating problems in water injection and oil production. It is necessary to conduct effective treatment when calcium sulfate precipitation occurs. Phosphonate-based scale inhibitors (SIs) are commonly used to control mineral scaling. In this work, the performances for calcium sulfate inhibition by four phosphonate-based SIs were investigated in high salinity and high hardness waters. Experiments at elevated temperatures (65°C, 90°C and 120°C) were conducted to demonstrate the effects of temperature on the scale inhibition efficiency. The results showed that a 100% inhibitive performance could be achieved in the addition of SI-2 at 65°C and 90°C with a dosage of <20 ppm. It was also observed that the inhibition rate on calcium sulfate decreased severely at a temperature up to 120°C.