The Transient Pressure Techniques for Identifying Condensate-Banking

Resumo

Gas-condensate reservoirs represent a large part of the gas reserves in the world containing large amounts of hydrocarbons, but due to thermodynamic aspects and dynamic behaviour of fluids in these reservoirs, the production of resources presupposes a very complex activity that requires a broad understanding and mastery of various recovery mechanisms and reservoir engineering practices. In these reservoirs, when the pressure drops below the dew point pressure due to the production of its fluids, some liquid components emerge from the gas in the reservoir in condensate form and which over time accumulate in the vicinity of the well making the production activity very challenging for engineers. This accumulation of saturation of condensate decreases the relative permeability of the gas and intensifies in the vicinity from the well causing a block to the gas flow to the surface. Given the importance and the impact of this phenomenon on the productive capacity of the reservoir, becomes It is imperative to predict its occurrence in order to provide the control mechanisms and / or mitigation. This research is dedicated to studying transient pressure techniques as a way of identifying the condensate-banking phenomenon. To perform the experiments of this study it was necessary to use two types of software. The first software was the reservoir simulation, Eclipse, in the compositional model (E300), where reservoir and well tests were carried out. Then, the pressure transient test software, KAPPA-Saphir. With this study, it was possible to prove that by doing an analysis from the derivative curves of pressure the moment and circumstances in which Condensate-Banking occurs can be predict.