Abstract
The binary polymer AA/SAS was synthesized by acrylic acid (AA) and sodium allylsulfonate (SAS), named as AS and its structure was characterized. Its scale inhibition performance was also investigated for single CaCO3, CaSO4 scales, and composite scales in simulated formation water containing Ca2+, Mg2+, Ba2+ and Sr2+. The results indicate that when adding 50mg/L of the inhibitor, it is 85.05% efficient for CaCO3 inhibition and 98.85% for CaSO4, but only 49.05% and 51.58% for BaSO4 and SrSO4 separately. The scale inhibition performance is obvious in the simulated formation water with high concentration of calcium (1300mg/L) and low barium ion (100mg/L ), the inhibition efficiency are both above 85% at a dosage of 80mg/L. And it can fairly satisfy the demand of inhibiting composite scales (CaCO3 scale, CaSO4 scale, BaSO4 scale and SrSO4 scale), when AS and CT was combined at a mass ratio of 2:1 in high calcium , barium and strontium ions contained formation water, being 95.3% efficient at the dosage of 100mg/L.
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