Synthesis and characterization of maleic acid and sodium methallyl disulfonate new copolymer: application as a barium sulfate scale inhibitor

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.

Synthesis, characterization and properties of a novel environmentally friendly ternary hydrophilic copolymer

“…The copolymer structure consists of hydrophobic and hydrophilic groups, with carboxyl and sulfonic acid groups as hydrophilic groups and benzene rings and carbon chains as hydrophobic groups. 27 In polymerization, the molar ratio of monomers has a great influence on the proportion of hydrophilic to hydrophobic groups in the final product. 28 Based on the data in Fig.…”

“…From a mechanistic point of view, the complexation effect, and crystal distortion all depend on the adsorption of the anionic charge inhibitor on the developing nucleus surface and the positively charged growth sites of the growing crystals. 27 IA-AM-SSS is a structurally well-defined triblock copolymer with negatively charged hydrophilic blocks of carboxylic acid groups, amide groups, and sulfonic acid groups on the side chains. The polymeric scale inhibitor is physically and chemically adsorbed on the calcium carbonate nucleus during the crystalline embryonic stage, making the nucleus particles negatively charged, and they form a double electric layer with the counter ions near the charged surface.…”

“…The reason is that on the one hand, the hydrophilic group -COOH in IA is the main group to inhibit CaCO 3 , and on the other hand, -CONH 2 in AM acts synergistically with the hydrophilic group -COOH to chelate with Ca 2+ to achieve scale inhibition. 14,21,27,29 However, if the ratio of IA(-COOH) is too high, it is easy to form intramolecular hydrogen bonds in the copolymer and the hydrophilic chains are too long and entangled in occulation, leading to a decrease in the inhibition efficiency of CaCO 3 . 30 Fig.…”

Preparation of carboxy sulfonic acid‐containing copolymer scale inhibitors and their scale inhibition effect on CaCO3

“…Fouling leads to reduced well productivity, and a reduction in the inner diameter of the pipeline and causes problems such as sub-scaling corrosion, unplanned well workovers, and so on, thus leading to deterioration in the technical and economic indicators of oil and gas companies. [7][8][9][10] Once a layer of scale has formed, it will continue to thicken if not treated promptly. The scale removal process must be easy to deploy and not cause damage to the wellbore, tubing, and reservoir.…”

“…As a result, scaling can occur anywhere along the production pipeline. Fouling leads to reduced well productivity, and a reduction in the inner diameter of the pipeline and causes problems such as sub‐scaling corrosion, unplanned well workovers, and so on, thus leading to deterioration in the technical and economic indicators of oil and gas companies 7–10 …”