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Enhanced Assessment of Stress Dependent Permeability of Sandstone Rock


 Permeability is one of the most important parameters in formation evaluation, reservoir characterization, and hydrocarbon production. There are many methods in the industry to model in-situ permeability relationship, but it is also critical to know that permeability decreases with the increase of effective stress as has been reported i.e. permeability is sensitive to changes in stress and pore pressure. In this study, a relationship between permeability and effective stress is developed for Sandstone reservoirs using 4Dmodel with a two-way coupling between Geomechanics and fluid-flow.
 A relationship between in-situ horizontal stress and permeability has been investigated in several reservoirs around the globe. This paper addresses fundamental controls on stress dependent permeability, as identified through modeling and observations. The model developed provides a description of effective stress and explains the dynamic impact of geomechanical stresses on key production parameters in an effective way. This procedure will lead to a more robust simulation model and history match for the life of the reservoir.
 Conventional measurement (porosity, permeably, and grain density) has been observed in sandstone formation, while acoustic slowness is obtained by wireline and/or LWD measurement to create empirical correlations between permeability, porosity, velocity and effective stress. These correlations show a good agreement with available geomechanical data that commonly used in the industry for sandstone Formation. A workflow for modelling is developed to improve formation evaluation and assessment of stress-dependent permeability. The model can help in predicting sweet spot and enhance the long-term productivity