Abstract
The aim of this work was to analyze and evaluate the effectiveness of depressant additives and corrosion inhibitors based on maleic anhydride and its modified copolymers to improve the rheological properties of high-paraffin oils. Modern approaches to the synthesis and modification of maleic anhydride and its copolymers with α-olefins and alkene-containing monomers are considered, and the mechanisms of their action as pour point depressants and corrosion inhibitors are analyzed. Experimental studies included the preparation of surfactants using one-stage and two-stage methods involving esterification and subsequent amidation. The synthesized surfactants were tested as depressant additives. It was shown that the introduction of the SMATWEEN additive reduces the pour point of oils from the Kumkol and Zhetybai fields by 15 °C, and that of the Kumkol–Akshabulak oil blend by 21 °C. The obtained results confirm the prospects of using modified maleic anhydride copolymers for regulating the rheological properties of high-paraffin crude oils in the oil industry.