Produced oil has to be blended to ensure the density and viscosity are less than the defined shipping limits.
This must happen prior to shipping the produced oil on a major pipeline. The easiest and most cost-effective way to lower the viscosity of produced heavy oil before transporting is to add condensate. Producers commonly overcompensate with extra condensate because their current systems cannot accurately measure viscosity in real-time. Condensate costs can be significant for the producer or shipping company.