Abstract
Naturally fractured reservoirs contain a significant amount of the world oil reserves. The production of this type of reservoirs constitutes a challenge for reservoir engineers. Use of reservoir simulators can help reservoir engineers in the understanding of the main physical mechanisms and in the choice of the best recovery process and its optimization. Significant progress has been made since the first publications on the dual-porosity concept in the sixties. This paper and the preceding one (Part 1) present the current techniques of modeling used in industrial simulators. The optimal way to predict matrix-fracture transfers at the simulator cell scale has no definite answer and various methods are implemented in industrial simulators. This paper focuses on the modeling of physical mechanisms driving flows and interactions/ exchanges within and between fracture and matrix media for a better understanding of proposed flow formula and simulation methods. Typical features of fractured reservoir numerical simulations are also described with an overview of the implementation of geomechanics effects, an application of uncertainty assessment methodology to a fractured gas reservoir and finally a presentation of a history matching methodology for fractured reservoirs.
Highlights
After describing in the preceding paper the mathematical formulation of the physics required for simulating flows in multi-scale fractured reservoirs, we focus on the main specific issue of dual-porosity simulators, that is the modeling of matrix-fracture transfers at the simulator cell scale
The second section presents the implementation of geomechanics in fractured reservoir simulation
For the fractured field under consideration, all the parameters determining the amount of fracture gas available for production were found to control the value of the gas recovery factor: a high fracture porosity, a low fracture equivalent permeability as well as matrix medium parameters increasing the kinetics of spontaneous imbibition phenomena, such as a high water relative permeability and a small block size
Summary
Il n’y a pas de réponse définitive pour simuler de manière optimale les échanges matricefracture, et, différentes méthodes sont mises en œuvre dans les simulateurs industriels de réservoir. Ce papier se concentre sur la modélisation de la physique des écoulements au sein des milieux matrice et fracture et des échanges entre ces deux milieux afin de mieux comprendre les différentes formulations proposées dans la littérature. State of the Art: Part 2 – Matrix-Fracture Transfers and Typical Features of Numerical Studies — Naturally fractured reservoirs contain a significant amount of the world oil reserves. The production of this type of reservoirs constitutes a challenge for reservoir engineers.
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