Patent ID: 7134500
Filing Date: 2006-11-14
Classification: E21B,G01N

Abstract:
1. A method for characterizing formation fluid using flowline viscosity and density data in an oil-based mud (OBM) environment, said method comprising: a) providing an initial estimate of at least one of the density and viscosity of the crude oil and oil filtrate components of the mixture of formation fluid and OBM; b) measuring the volume fractions, and at least one of the density and viscosity of the total mixture of formation fluid and OBM; c) computing at least one of the density and viscosity of the total mixture using the estimate of at least one of the density and viscosity and the measured volume fractions; d) comparing the at least one of the computed density and viscosity of the total mixture with the at least one of the measured density and viscosity of the total mixture; and e) charactexizing the formation fluid by updating the estimate of the at least one of the density and viscosity of the individual components of the formation fluid based on the comparison of the computed density and viscosity of the total mixture with the measured density and viscosity of the total mixture.