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Fluid Flow in Unconventional Reservoirs - Modelling and Implications
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 76th EAGE Conference and Exhibition 2014, Jun 2014, Volume 2014, p.1 - 5
Abstract
A new fully coupled model of fluid flow through deformable viscoelastoplastic porous rock is developed. Constitutive evolution equations for porosity and densities of the solid matrix and the fluid are derived using effective media theory. Deformation and porosity-dependent permeability in the model lead to a strong pressure dependence of leakoff during hydraulic fracturing. Predicted rates of fluid loss are higher than those suggested by classical models. The model also allows investigation of the preferred upward flow pathways during fluid injection operations as observed in CO2 injection operations without invoking the hypothesis of a pre-existing fracture network. The model is applicable to soft and unconventional reservoirs whose mechanical behavior cannot be captured by simple elastic laws.