For modeling naturally fractured reservoirs, the dual-porosity poroelastic model is effective and accurate to characterize stresses as well as flow fields. A generalized plane strain and dual-porosity finite element solution has been developed for analyzing horizontal borehole stability. Two kinds of failure criteria (spalling and collapse) were included. Results show that horizontal borehole stability depends strongly on the in situ stress state, the borehole orientation, time, mud pressure and fracture characteristics.

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