SUMMARYA sand production model was developed for volumetric sand production predictions that take into account the e!ects of the external stresses and #uid #ow rate. The model couples the poro-mechanical behaviour of the solid}#uid system with the erosion behaviour of the solids due to #uid #ow. It predicts reasonably experimental volumetric sand production data from a hollow cylinder test on a weak sandstone. The test results show that in weak and compactive sandstones, sand production is associated with decohesioning and plastici"cation of a zone around the inner hole which can then be mobilized by the hydrodynamic forces of the #uid #ow. The sand production rate increases both with external applied stress and #uid #ow rate but it is constant with time under constant external stress and #uid #ow rate. In both cases a critical lower limit has to be exceeded for sand production initiation.

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