Synthesis and Study of Modified Polyaspartic Acid Coupled Phosphonate and Sulfonate Moieties As Green Oilfield Scale Inhibitors

The petroleum industry has strived for several years to explore environmentally friendly scale inhibitors with no acute environmental impact. Well-known industrial biodegradable polyaspartic acid is widely used as a potent inhibitor (SI) against various inorganic scales in circulating cooling water and topside applications. However, showed weak thermal stability at the reservoir temperatures. Here, we attempt develop new class of squeeze treatment applications under harsh conditions. In this project, series modified acid, including pendant anionic functional moieties (phosphonate sulfonate) were synthesized investigated SIs inhibit calcium carbonate (calcite, CaCO3) barium sulfate (barite, BaSO4) oilfield These classes via aminolysis polysuccinimide nucleophilic amine reagents alkaline products are acid-capped aminomethylene phosphonic (SI-2), bisphosphonic (SI-3), aminomethanesulfonic (SI-4), aminoethanesulfonic (SI-5), well in-house (SI-1). inhibition activities these compounds determined using dynamic loop test 100 °C 80 bar. Furthermore, long-term aging tolerance experiments also investigated. It was found that polyaspartic-acid-capped (SI-2) gave outstanding calcite performance excellent 130 7 days compared SI-1 other (SI-3-SI-5). This phosphonated polymer exhibited superior Ca2+ ions up ppm, moderate range 1000–10 000 ppm ions. project highlights success designing developing SI-based