Application of new reagents against asphaltene-resin-paraffin deposits and corrosion

The impact of the depressant additive Difron-4201 and the composition (hereinafter referred to as AI-1) on paraffin deposition, freezing temperature and surface tension in high-paraffin oil at the ratio of S-1 inhibitor:Difron-4201=28:1 was studied under laboratory conditions for the first time. It was found that the composition AI-1 has a higher efficiency compared to the depressant additive Difron-4201. Thus, at the optimal concentration where the highest effect is observed, the effect of the additive and composition is 96.3% and 97.8% on paraffin deposition, 155.6% and 200% on freezing temperature, and 52.3% and 69.1% on surface tension, respectively. In addition, the impact of inhibitor S-1 and composition AI-1 on the corrosion rate in an aggressive medium with hydrogen sulfide, carbon dioxide and their mixture, as well as on the vital activity of sulfate-reducing bacteria from the Postgate's "B" nutrient medium, was studied. The results of experiments showed that the optimal concentration of inhibitor S-1 is 45 g/t, while the optimal concentration of composition AI-1 is 700 g/t. In comparison with reagent S-1 in the Postgate's "B" nutrient medium, the AI-1 composition shows higher activity both in aggressive environments where gases are present separately and together, and also in a fertile environment for the growth of sulfate-reducing bacteria. At the optimal concentrations of inhibitor S-1 and composition AI-1, the corrosion protection effects are 95.8% and 98.7% in a hydrogen sulfide environment, 88.9% and 93.8% in a carbon dioxide environment, and 90.3% and 95.4% in the environment where both gases coexist. At the optimal concentration, the bactericidal effects of inhibitor S-1 and composition AI-1 are 86% and 97%, respectively.