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Dual-Permeability Models for Coupled Reservoir Geomechanical Modeling: Field Application to Optimize Injection
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, EAGE Workshop on Naturally and Hydraulically Induced Fractured Reservoirs – From NanoDarcies to Darcies, Apr 2011, cp-228-00010
- ISBN: 978-90-73834-06-4
Abstract
Fracture models, including connected fracture networks, fracture corridors, unconnected fractures and nonconductive fractures, are presented, using different dual-permeability models that have been developed. To simulate the dynamic response of fractured reservoirs, the opening of nonconductive fractures is simulated based on either fracture dilation due to shearing or fracture opening due to tensile failure. Once the opening of nonconductive fractures occurs, the permeability of all fractures (both conductive and nonconductive) changes dynamically according to the changes in the effective stresses that occur due to reservoir depletion and/or injection. Dual-permeability reservoir models developed on the basis of the proposed fracture models improve reservoir simulations. The newly developed dual-permeability modeling was applied to produced-water reinjection scenarios in a field in Southeast Asia and realistically simulated the dynamic behavior of the reservoir during injection. Such modeling reveals the ongoing interaction among pressure, rate, permeability, and deformation in the reservoir. This approach assists in the design of an optimal water-injection schedule to maximize production with a reduced risk of cap rock damage and water leakage into overburden.