This paper describes core-flow experiments with sandstone cores and artificial produced water. The water contained small quantities of solids in the form of ground sandstone, of oil in the form of droplets, or both solid particles and oil droplets. In the case of water with solid particles the parameters having the largest influence were particles concentration and, to a lesser extent, size. Usually a considerable decrease of the permeability of the first section of the core was observed after an amount of a few hundred pore volumes was injected. For a relatively low particle concentration, in combination with a relatively small average particle size, this decrease was less severe. Injection of water with only oil droplets eventually led to a small permeability decrease in all core sections. Also for injection of water containing both oil droplets and solid particles, the particles concentration appeared to be the most influential parameter. Here the presence of oil usually led to some additional permeability decrease.

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