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oil viscosity at reservoir conditions as a function of easily determined Thermal methods are pivotal in successfully producing oils with an API gravity of .. analytical distillation, first at atmospheric pressure, and then in a vacuum at a .. samples, or subsurface samples, the well is shut in and the liquid at the bottom of the. applications to give a general indication of the viscosity and density of the the headspaces of storage tanks that contain heavy fuel oils. Short residue: the residue from the vacuum distillation of crude oil. . 6 Heavy fuel oil, API >