2d Compositional Reservoir Simulation Using Unstructured Grids in Heterogeneous Reservoirs

Abstract

This paper presents a 2D implementation of an element-based finite-volume formulation (EbFVM) using triangles, quadrilaterals, or a combination of both elements in conjunction with a compositional reservoir simulator. The formulation is implemented into the UTCOMP simulator considering a full tensor formulation for the advection and diffusion terms. The UTCOMP simulator was developed at the Center of Petroleum and Geosystems Engineering at The University of Texas at Austin for the simulation of enhanced recovery processes. UTCOMP is a compositional multiphase/multi-component, IMPEC simulator, which can handle the simulation of miscible gas flooding processes. The results of several case studies involving homogeneous and heterogeneous reservoirs are presented in terms of volumetric rates of oil and gas, and saturation fields.

Development of a fully implicit approach with intensive variables for compositional reservoir simulation

“…UTCOMPRS is a modified version of the UTCOMP simulator, which initially was developed by Chang (1990), Chang et al (1990), Perschke (1988), Perschke et al (1989a), andPerschke et al (1989b) that considers up to four phase flow (water, oil, gas, and a second oleic phase) with rigorous flash and phase stability calculations. UTCOMP was originally implemented using the Acs et al (1985) IMPEC approach using Cartesian grids and since the original implementation has been the subject of several improvements and the addition of new capabilities such as unstructured grids (Fernandes et al, 2012;Araújo et al, 2016), corner point (Fernandes et al, 2014a), TVD schemes for unstructured grids (Fernandes et al, 2013;(Fernandes et al, 2015a), high performance computing (Doroh, 2012), to name few improvements in the UTCOM-PRS simulator. The enhanced simulator is referred to as UTCOMPRS.…”

A TVD scheme for 3d unstructured grids applied to compositional reservoir simulation

“…The EbFVM implemented in the UTCOMP simulator are based on Marcondes and Sepehrnoori (2010), Marcondes et al (2013) and Santos et al (2013) for the General Purpose Adaptive Reservoir Simulator (GPAS). In UTCOMP, the implementation for 2D and 3D unstructured grids using the EbFVM and the IMPEC approach are presented in Fernandes et al (2012) and Araújo et al (2016). Additionally, IMPSAT (Implicit Pressure and Saturations) approaches (Fernandes et al, 2014;Fernandes et.…”

Comparison of two volume balance fully implicit approaches in conjunction with unstructured grids for compositional reservoir simulation

“…The UTCOMP simulator is a multicomponent/multiphase simulator that takes into account up to four phases that was developed at the University of Texas at Austin. The two FI approaches implemented in this work are compared with the original IMPEC formulation of Ács et al [6] originally implemented in the UTCOMP simulator with use of Cartesian grids [34] and the EbFVM [35,36,37] . These implementations can be further improved by parallel processing using, for instance, a message passing interface as was done by Doroh [38] , who extended the UTCOMP simulator's IMPEC serial formulation into a parallel framework, and by Wang et al [39] , who implemented and tested a framework to run the GPAS simulator in parallel was developed, an FI reservoir simulator.…”