Asphaltene deposit formation is a severe problemfrequently faced during crude oil production that affects thereservoir, production tubing and facilities, depending on thestage where this critical point is reached. This pointcorresponds to the pressure at which asphaltene particles startto form and directly related to the oil chemical physicalstability.Modeling of asphaltene precipitation in the reservoirporous media and in the oilwell tubing of an Iranian south oilfield is the purpose of this study. For the reservoir, themodeling technique based on the representation of theprecipitated asphaltene as a pure dense phase and division ofthe heaviest component in the oil into non-precipitating andprecipitating components. A set of dummy experimental datawas used to tune an equation of state based model thatrepresents the asphaltene as pure component solid. Results ofthe work show that the chosen model could accuratelyrepresent the behavior of the fluids of the reservoir.For the oilwell tubing, a method based on the change ofwell flow conditions has been used to predict the onset ofasphaltene precipitation. The flowing wellhead pressure(FWHP) data from the case study well gathered during theproduction history of the well. These data generated usefulinformation concerning the well flow conditions that couldinfluence the onset of asphaltene precipitation.
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