Patent ID: 9255871
Filing Date: 2016-02-09
CPC Classification: G01N

Claim Text:
1. A process for determining dynamic viscosities of monophasic samples extracted from a crude oil well comprising: measuring the viscosity of a 20 to 50 mL crude oil sample at a first temperature up to 463 K and a first pressure greater than the atmospheric pressure; decrementally reducing the pressure from the first pressure to a second pressure, subsequently stabilizing the sample at the first temperature, and thereafter measuring the viscosity at each pressure decrement and at the first temperature to determine a bubble point pressure and the dynamic viscosity at the bubble point pressure of the sample; measuring the bubble point pressure p extracting a gas cap from the sample to create a new sample; re-pressurizing the new sample above the bubble point pressure p decreasing the pressure and measuring the viscosity μ