Abstract
This paper presents results (a case history) of a comprehensive equation of state (EOS) PVT model validation and calibration study conducted on an extensive gas condensate reservoir. Previous PVT model, derived from the original condition PVT samples has been reviewed. PVT samples, separator test data and production history matching of subsequent producing years pose a significant challenge to any early life PVT model. A systematic approach has been taken to tackle the task, starting from trying to recalibrate the original EOS PVT model to conducting various quality control and sensitivity studies. We show all the challenges that we faced trying to match well tests, well stream samples and the long production history, and their solutions. This includes identifying and explaining anomalous data, filling in the gap of the data trends, making use of look-alike (pressure, temp, depth, area) reservoir fluid composition, minor compositional modulation to account for common and known sampling and testing inaccuracies etc. This study shows how a pre-development PVT model of a gas condensate can successfully be calibrated with a long production history with minor logical adjustments, thus spare the engineers from the agony of having to re-do a full-fledged PVT modelling work; therefore add confidence to their predictive modeling work.
