An Integrated Pipe Network Model for Simulation of Highly Fractured Reservoirs

Abstract

Abstract The Monterey Formation, a very prolific reservoir rock, exhibits unique fracture structures where fault zones and other highly brecciated intervals serve as large conduits for fluid movement. Modeling of a network for effective tracking of oil-water contact and rapid subsidence of the invaded water requires new thinking on the modeling process. In this work, we propose a novel integrated pipe-network model (PNM) for simulation of highly fractured reservoirs. It consists of constructing a regular or irregular pipe-network in 2D or 3D space according to major fracture distribution and orientation in reservoirs. Pipe network is the channel for fluid flow, where Darcy's law is applied directly. Micro-fractures and possible matrix in the formation serve as reservoir storage elements at pipe network junctions, at which mass balances are established. The major benefits of the new technique are simplicity in mathematical formulation and superior ability to adapt to fracture distributions. An example is included to compare the result of the proposed pipe network simulator with that of a traditional dual porosity simulator.