Abstract
Abstract Results are presented from an investigation into the hydro-mechanical response of a rock mass to changes in effective stress associated with fluid extraction. Numerical models of regularly and randomly fractured reservoirs have been created using UDEC, the distinct element code. Relationships between permeability and stress state have been established in regions immediately adjacent to simulated wellbores and more generally throughout the fractured reservoirs. The effects of in-situ stress state, hydraulic boundary conditions and scale have been investigated. The results demonstrate that numerical modelling combined with analytical solutions can be employed to investigate coupled flow-deformation analysis realistically for simple geological situations. The relationships presented here relating fracture pemeability to stress field changes will be helpful in understanding the behaviour of naturally fractured reservoirs during pressure depletion.
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