An integrated experimental approach to determination of clogging kinetics of porous media

Authors: D.N. Mikhailov, N.I. Ryzhikov, V.V. Shako (Schlumberger Research and Development Centre, RF, Moscow)

Key words: porous medium; near-wellbore zone; transport of solids; drill mud; internal filter-cake.

The authors present a new technique for estimating of kinetic parameters of internal filter-cake buildup by combining laboratory mud-filtration experiments with a profile of invaded mud components reconstructed by X-ray microcomputed tomography, image processing of a cleaved sample, and ultrasonic wave scanning. We include examples of reconstructed profiles of invaded mud components (solid particles and bentonite clay) as well as the procedure of determining of internal filter-cake parameters. Using obtained profiles we demonstrate that value of “critical porosity” when all mud particles stop to penetrate into porous medium and depost at the sandface, forming the external filter-cake. In the case of heterogeneous rock (limestone) the group of high-conductive pores is visualized.

Developed experimental techniques allow obtain the profile of mud components in core sample, determine the parameters of clogging kinetic and, then, calculate the mud components and permeability profiles in the near-wellbore zone.

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