Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Effect of Relative Permeability Curves on Near Well Gas-Condensate Flow
Submission Author:
Marcio CARVALHO , RJ , Brazil
Co-Authors:
Debora Yohane Cunha Azevedo Martins, Paula Reis, Marcio CARVALHO
Presenter: Marcio CARVALHO
doi://10.26678/ABCM.COBEM2023.COB2023-1551
Abstract
In gas-condensate reservoirs with pressures below the dew pressure, the productivity of wells can be compromised due to the accumulation of liquid in their surroundings. This phenomenon is known as condensate blockage and there are many challenges to understanding the formation of condensate banks. One of them is the determination of the relative permeability of the liquid and gas phases, which commonly comes from permeability curves obtained from the extrapolation of few experimental data. Thus, they tend not to reliably represent important effects for the flow, compromising the precision of the flow modelling in the porous medium. In order to investigate the effect of relative permeability curves on the formation of condensate banks, a reservoir-scale compositional model was developed for the study of flow of gas and condensate. With the model, the use of relative permeability curves obtained by simulating the gas-condensate flow at the pore-scale and with correlations proposed in the literature was evaluated. It is considered: isothermal system, two-phase flow and incorporation of capillary force effects through the relative permeability model. Molar balance and volume consistency equations form a nonlinear system solved by Newton´s method that provides pressure and number of moles of each component, in all control volumes of the model, at each time step. For the phase equilibrium, calculations of the Peng & Robinson equation was implemented in a constant pressure and temperature flash routine. The model was validated against the analytical solution for single-phase flow and, finally, the simulator obtained the temporal evolution of the pressure and saturation as a function of the distance from the well, in order to compare the effect of different models of relative permeability curves in the prediction of condensate blockage. The results were obtained at different values of the absolute permeability of the medium and the gas flow imposed in the well, and the impact of these parameters on the accumulation of condensate was evaluated.
Keywords
Gas condensate, EOR, condensate formation, Reservoir Simulation
