LOW TEMPERATURE FLOW CHARACTERISTICS OF SOME WAXY CRUDE OILS IN RELATION TO THEIR COMPOSITION: PARTI WITH AND WITHOUT POUR POINT DEPRESSANT ADDITIVES

摘要

The yield stress, plastic viscosity and apparent viscosity and the dependence of the latter on the shear rate have been studied at different temperatures below pour point of Lingala (Krishna- Godavari basin. Eastem coast), Duliajan (Eastern region of Assam), Rava (Godavari basin) and Bombay-High (off-shore westem region) indigenous crude oils. Four different commercial pour point depressant additives have been used to study their effects on the pour point, yield stress and plastic viscosity. From this study it has been found that wax concentration and its composition are primarily responsible for the variation in the pour point, and crude base composition has a small effect.