Estudo paramétrico da histerese em reservatório de óleo leve

Abstract

The great reserves of light oil found on Brazilian fields also has a significative amount of CO2 dissolved. This CO2, when produced can be treated and released or reused on the process of water alternating gas injection WAG. In this context, this study use WAG-CO2 immiscible injection in similar conditions to those found on Sergi-C field, high pressure and low temperatures, to create a model for reservoir simulation where will be analyzed parameters of relative permeability hysteresis. For this was modeled a light oil, similar to this field, a homogeneous reservoir with similar characteristics to Buracica reservoir found on Bahia concave, producing from an inverted 5-spot mash with 20 years of project. Two models of relative permeability hysteresis were studied, Killough (1976) model and Larsen and Skauge (1998) model. An analyzis of each parameter of those models showed that, in a few cases, there can be an oil recovery factor up to 98% while at others, the hysteresis can determine a deficit on oil recovery of more than 20%.