A New Generation EOS Compositional Reservoir Simulator: Part I - Formulation and Discretization

Abstract

TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractA fully implicit equation-of-state (EOS) compositional simulator for large scale reservoir simulation is presented. The simulator uses a multiblock, domain decomposition approach; that is, the reservoir is divided into non-overlapping subdomains that are solved locally in parallel (inner iteration). The subdomain grids are defined independently of each other and their connections are attained through a global interface problem (outer iteration) formulated in terms of appropriate equations that guarantee continuity of total component fluxes. Parallel, iterative techniques are employed to solve the resulting nonlinear equations. The model formulation has been successfully tested for a dry gas cycling process on a single fault block. The numerical results show that the simulator and fluid-related calculations can be conducted efficiently and robustly. Promising results have been obtained using the proposed multiblock approach for nonmatching grids between fault blocks for two-phase flow problems.This work is presented in two parts. In Part I we outline the mathematical formulation and discuss numerical solution techniques, while in Part II we address framework and multiprocessing issues.

Development of an Efficient Embedded Discrete Fracture Model for 3D Compositional Reservoir Simulation in Fractured Reservoirs

“…However, since the embedded discrete fracture model (EDFM) is developed under the EOS compositional module, we present the formulation of this module in more details. Wang et al (1997Wang et al ( , 1999 All the developments in this research, which will be presented in the forthcoming chapters, are implemented in the EOS compositional module of GPAS. Hence, in the following sections, we describe the governing equations, phase behavior equations, and solution procedure of the EOS compositional module in GPAS.…”

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