A coupled iterative hydromechanical analysis of a stress sensitive Brazilian carbonate reservoir

摘要

The production of a petroleum reservoir is a coupled process between stress variation and fluid flow phenomena, which affects the reservoir and its surrounding rocks. This study aims to assess production and geomechanical aspects of an oil field located in Campos Basin - Brazil, called Field B, by different hydromechanical coupling schemes. In this work, one-way and two-way coupled hydromechanical simulations were carried out by using a methodology developed by the research group GTEP/PUC-Rio, which enables to run coupled hydromechanical simulations between a commercial black-oil simulator and an inhouse, stress analysis software (CHRONOS). Two sets of coupling parameters were used to introduce the geomechanical effects in the reservoir simulation on the two-way coupling. The first set is constituted by porous compressibility and porosity. Furthermore, the second was constituted by porous compressibility, porosity and absolute permeability. Then, flow and geomechanical results were compared. In this particular scenario, the results of the two-way simulation that used the first set of coupling parameters were similar to the one-way coupling. On other hand, diverged significantly from the second, mainly by the predicted oil production rate. Therefore, in this case, neglecting permeability reduction due to depletion can lead to significant errors.