Abstract
A water-soluble copolymer of maleic acid (MA) and sodium methallyl disulfonate (SMADS) were synthesized by aqueous solution free radical polymerization and evaluated as scale inhibitor for barium sulfate. The copolymer was characterized by FTIR, HNMR, GPC and HPLC results verified the structure of MA-SMADS copolymer and molecular weight was about 1050 g/mol. The experimental results indicates that the optimal conditions for copolymer synthesis are 105 °C, monomer dosage 30% (wt) and sodium persulfate (NaPS) dosage 7%. The inhibition performance of polymer on barium sulfate was evaluated through static bottle test and the static inhibition rate on barium sulfate can reach up to 98%. Consequently, the evaluation criteria was carried out by dynamic scale loop test.
Highlights
Oil exploration industries are currently facing the issue of scales of barium sulfate and other sulfates which form a strong layer on the inner surface of equipment, pipelines and systems
The FTIR spectrum shows the following absorption bands: 2933 cm−1 (Methylene stretching and vibration peak), 1718.39 cm−1 (Absorption peak at 1718.39 cm−1 is attributed to stretching vibration of carboxyls), 1174 and 1041 cm−1, 623.47 cm−1, 1HNMR spectra—2.6–2.2 ppm attributed –CH (MA), C H2 in alpha of S O3H is often around 2.5–3.0 ppm, CH2 is around 1.0 ppm of polymer backbone
Second stage; to determine the exact Minimum inhibitor concentration (MIC) of each inhibitors, dosage is set at 5 ppm in the respective inhibitor MIC range, At this dosage the tube blocking for Flosperse 3000SM is observed at 95 ppm so, the MIC for this inhibitor can be regarded as 100 ppm to resist brine water scale deposition for a period of 7 min
Summary
Oil exploration industries are currently facing the issue of scales of barium sulfate and other sulfates which form a strong layer on the inner surface of equipment, pipelines and systems. Keywords Copolymer · Scale inhibitor · Barium sulfate · Minimum inhibitor concentration (MIC) · Dynamic scale loop · Inhibition efficiency
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