The research Quality Cost of Sudanese Crude Oil (Nile Blend) was selected for the sensitive impact of waxes on the transport of crude oil having considerable amount of it. I wonder to realizing the goals aimed from the practice that will be involved, some sort of oil - related literature should be talked; this involves the chemical composition of the crude oil, their physical nature, classification, upstream processing, and rheological problems of waxy crude oil. And also the necessity of lab characterization of crude oil for flow assurance purposes is illustrated.