Summary

For underground reservoirs, the decrease of pore pressure during hydrocarbon production can trigger reservoir compaction and subsidence problems. In order to analyse and forecast those phenomena, the finite element method (FEM) has been employed in several applications because of its flexibility in the treatment of geometry and topological heterogeneity. Those FEM features can provide more realistic estimates in real fields. However, a linear elastic model is usually adopted to simulate the behaviour of rock materials, disregarding different deformation mechanisms. This paper takes into consideration that issue through the analysis of a real field adopting the linear-elastic and the elasto-plastic Mohr-Coulomb and Modified Cam-Clay models. The results suggest that a careful definition of constitutive models should be given since the compaction and subsidence predictions may be significantly different.

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