关键词: 含蜡原油, 结蜡层, 结蜡规律, 胶质和沥青质, 蜡

Abstract: The wax deposition was studied for man-made crude oil with various compositions (different contents of resin, asphaltene and wax) under various conditions in a rotary wax deposition facility. The influence of the compositions was explored by sediment sampling from tubing wall, analyzing with the differential scanning calorimetry (DSC) and using four components method. Combined with mechanism of the wax deposition initiated by resin and asphaltene, it was found that lower content resin and asphaltene in crude oil could have a synergistic effect with paraffin molecules on the wax deposition, while for higher content resin and asphaltene they were attached to the pipe wall in the form of paste, although the existence of resin and asphaltene could weaken the driving force for paraffin molecule migration and impede deposition of paraffin molecules. The results obtained from studying on the effect of various wax contents on wax deposition showed that higher average carbon number of paraffin molecules in man-made crude oil was, less content of wax in the wax layer deposited. But the paraffin molecules with more carbon number could take place eutectic roles with resin and asphaltene easily, due to they were of longer carbon chain, leading to they was easier to deposit on the pipe wall with resin and asphaltene together.

Key words: waxy crude oil, wax deposition layer, wax deposition law, resin and asphaltene, wax