The Use of a Real-gas Potential Approach in a ...

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XVI International Conference on Computational Methods in Water Resources (CMWR-XVI) Ingeniørhuset

The Use of a Real-gas Potential Approach in a Multi-component Simulator for Highly Fractured Reservoirs
Author:Duane Smith <> (National Energy Technology Laboratory, U. S. Department of Energy)
W. Neal Sams <> (National Energy Technology Laboratory, EG&G)
Joseph Wilder <> (National Energy Technology Laboratory, U. S. Department of Energy)
Presenter:Duane Smith <> (National Energy Technology Laboratory, U. S. Department of Energy)
Date: 2006-06-18     Track: Special Sessions     Session: Geologic Sequestration of Carbon Dioxide

Dual-porosity simulators are ubiquitously used for fractured reservoirs. However, explicit-fracture simulators may be able to increase the accuracy and reliability of simulations for highly fractured reservoirs, because they can directly use descriptions (i.e., lengths, orientations, and apertures) of fractures as obtained from well logs (especially, fmi), out crop analyses, and other geological data. Al- Hussainy et al developed the real gas potential primarily for use in gas-well testing analyses and in single-phase simulators for a single, dry gas. The real gas potential has been used in the current work to develop an explicit fracture reservoir simulator for multi-component, miscible fluids. This simulator considers flow through explicitly defined fractures as well as storage/recharge in/from the surrounding rock matrix. The simulator allows for the use of multiple geologic layers in the reservoir, each of which has independently defined physical and/or flow properties such as thickness, permeability, porosity, diffusivity of the fluids through the rock matrix (important for low-permeability situations), and adsorption isotherms for one of more of the fluid components. Each of the fractures contained in the reservoir also has independently defined physical properties such as height, length, orientation, and aperture. Fluid flow between the layers of the geologic strata is via user-defined multi-layer fractures which extend through two or more layers. Such multi-layer fracture networks can be easily generated through the use of such codes as NETL’s FRACGEN, the output of which can be used directly with the flow simulator being reported on here. As a result of the explicit handling of fractures as well as the use of the potential formulation, simulation of multi-layer reservoirs containing tens of thousands of fractures can be performed in shorter times than those required by finite element codes. ------------------ (1)EG&G (2)U.S. Department of Energy