Study the impact of Difron 4201 depressor additive on formation of paraffin deposition in laboratory conditions

Abstract

The impact of Difron 4201 depressor additive on the asphaltene deposits on metallic surface has been studied for the first time in laboratory conditions via "coldfinger" method. The experiments were carried out in various temperatures of "coldfinger” and different concentrations of Difron 4201 depressor additive. The experiment lasted 3 hours. The amount of deposited paraffin in different times (0, 20, 40, 60, 80, 100, 120 minutes) on the coldfinger surface was specified via the analytical balance and it was defined that with decreasing temperature of the coldfinger the amount of oil sediments on the surface increases and the intensity of deposition decreases by time, and stabilizes after 120 minutes. As a result of the mass dependence of asphaltene deposits on the concentration of depressor additive, it was defined that with increasing concentration of the additive in the oil, the amount of deposits decreases and in the 900 g/t concentration, the maximum level of deposit reduction is observed. The efficiency of depressor additive and the maximum percentage of paraffin sediments on coldfinger surface has been estimated based on the obtained results of experiments. The highest effect was observed in the concentration of 900 g/t concentration of Difron 4201 depressor additive (85 %). Depending on the temperature of coldfinger the maximum percentage of paraffin sediments on the coldfiner surface was equal to 0 оC – 12.8, 5 оC – 9.16, 10 оC – 6.76, 15 оC – 5.82, 20 оC – 5.04, 25 оC – 2.96, 30 оC – 1.63.