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Mitigation of Wax Deposition by Wax-Crystal Modifier for Kermanshah Crude Oil

Several techniques have been used to minimize the wax deposition in crude oil pipelines, among them the continuous addition of wax crystal modifier inhibitors is considered as an attractive technological alternative. The main objective of this study was to determine the influence of the ethylene-covinyl acetate (EVA) copolymer and its combination with chloroform (C), acetone (A), P-xylene (PX), and petroleum ether (PE) on the wax deposition thickness of an Iranian crude oil (Paydar-East Reservoir). A new facility was designed and constructed to conduct the experimental part of this study. In this study, heat transfer method was used to measure the deposition thickness at different experimental conditions. Also, samples of the deposits were analyzed at the end of each test for their wax and asphaltene + resin contents. Comparison of the heat transfer and chemical analysis methods show consistent results. The experiments were performed with and without wax chemical prevention to determine the effects of the chemicals. The inhibitors were tested at different concentrations and the deposition thickness and wax and asphaltene + resin contents were obtained for each of the experiments. The prepared copolymer and solvents were investigated as wax deposition thickness reducer for waxy crude oil and it was found that, the maximum reduction was obtained by 800 ppm of EVA + A + PX with 50, 25, 25 wt%, respectively. Also, it was found that this blend of the inhibitors remove the wax which has been deposited before injection.