Study of a multifunctional composition in the preparation and transportation of heavy oils

Abstract

Under laboratory conditions, a novel composition comprising ND-12, Gossypol resin, and isopropanol in a ratio of 4:1.5:0.5, denoted as A-3, was investigated for the first time. Its efficacy in the demulsification of Muradkhanli and Umbaki heavy oil samples, with emulsion degrees of 41% and 31% respectively, was studied, along with its effects on freezing point, dynamic viscosity, and corrosion rate in hydrogen sulfide reservoir water. The optimal concentration of the reagent was determined to be 600 g/t. Over a two-hour period, the demulsification of Muradkhanli oil was conducted at 400C, 500C, and 600C, and of Umbaki oil at 400C, 500C, 600C, and 700C. The minimum amount of ballast water, with optimal composition thickness participation, was observed at 600C for Muradkhanli oil and 700C for Umbaki oil, constituting 0.1% and 0.13%, respectively. The freezing temperature of Muradkhanli oil decreased from +12.50C to +50C, and Umbaki oil from +110C to +40C due to the optimal viscosity effect of A-3 composition. At +200C, with 600 g/t of composition A-3, the dynamic viscosity of Muradkhanli oil decreased from 201 Pas to 111 Pas and from 1540 Pas to 237 Pas for emulsion degrees of 0.0%, 5%, 10%, 20%, 30%, and 41%. At +400C, the dynamic viscosity of Umbaki oil decreased from 182 Pas to 64 Pas and from 1183 Pas to 163 Pas for emulsion degrees of 0.0%, 5%, 10%, 20%, and 31%. Furthermore, A-3 composition exhibited higher efficiency in affecting the corrosion rate in hydrogen sulfide formation water compared to its constituent Gossypol resin. While the corrosion protection effect of Gossypol resin at optimal concentrations was 90%, A-3 composition reached 98%. These results indicate the complex and synergistic effects of the A-3 composition due to its constituent components. In conclusion, numerous laboratory tests revealed that the A-3 composition, comprising ND-12 demulsifier, corrosion agent Gossypol resin, and isopropanol solvent, is suitable for the demulsification, freezing point reduction, and dynamic viscosity adjustment of heavy oils such as Muradkhanli and Umbaki, as well as for effectively influencing corrosion rates in acidic environments. Therefore, the application of the new A-3 composition is recommended as an economically and ecologically efficient reagent for demulsification and transportation of heavy oils in mining conditions, as well as for corrosion protection of internal surfaces of transportation preparation facilities.