In a previous publication1  critera were derived for predicting the onset of fines release in sandstones. The present paper describes quantitatively the behavior of the sandstone after the fines have been released. The entrapment of fines at pore throats is modelled using a statistical approach and general population balance equations are written for the various species of interest. The equations are solved for the open pore densities and size distributions, for some special cases. The Effective Medium Theory is used to calculate the permeability once these are specified. The model therefore provides permeability as a function of time and position i.e. the extent and depth of damage. Such information will be valuable in not just predicting formation damage but also in designing appropriate stimulation jobs once the damage has occured.

You can access this article if you purchase or spend a download.