The operating plan generation of a reservoir is based on an effective dynamic characterization for recovery of reserves. To achieve this goal we must prepare, the model describes the interaction between the rock and the fluids present in the reservoir, as well as contributing to the achievement of the original reserves in place, facilitates the reproduction of the behavior of a reservoir to be undergone some enhanced recovery process. For this reason it was necessary to develop a methodology for determination of critical water saturation according to the size of Throat Poral by capillary pressure analysis performed on core samples of the fields belonging to developed areas of the Orinoco Oil Belt.

In this study we propose a methodology that combined with the little information that may exist in a specific area leads to a better use of that information as a representative model of the entire stratigraphic column.

These results can then be used as input for reservoir simulation models belonging to these fields, allowing the representation of heterogeneity present in the same anisotropy obtaining a representative distribution of the fluids and with this a more accurate estimation of reserves hydrocarbons and their movement within the reservoir, and generating operating plans with excellent results in the estimated potential wells.

In this case the method used yielded a correlation of critical water saturation as a function of pore throat radius, with an adjustment of 90% with respect to laboratory measurements.

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