Patent ID: 8996346
Filing Date: 2015-03-31
Classification: E21B

Abstract:
1. A computer-implemented method for characterizing petroleum fluid in a reservoir traversed by a wellbore, the method comprising: (a) for each given measurement station in a first set of one or more measurement stations within the wellbore, acquiring at least one fluid sample at the given measurement station and performing downhole fluid analysis of the fluid sample to measure properties of the fluid sample, the properties including measured total asphaltenes of the fluid sample at the given measurement station; (b) for a reference measurement station within the wellbore, using at least one probability distribution function to derive an estimated molar distribution of a plurality of asphaltene pseudocomponents at the reference measurement station; (c) using the estimated molar distribution as derived in (b) in conjunction with an analytical model to derive predicted properties of the plurality of asphaltene pseudocomponents at varying locations in the wellbore, wherein the analytical model is of the form:  where (d) for each given measurement station in the first set, using the predicted properties of the plurality of asphaltene pseudocomponents as derived in (c) to derive predicted total asphaltenes at the given measurement station, and comparing the predicted total asphaltenes at the given measurement station to the measured total asphaltenes for reservoir analysis.