This paper presents a summary of the results of an experimental and theoretical study on filtration properties of water based drilling fluids under dynamic and static conditions. The experimental investigation of the filtration properties was conducted as a function of mud types, solids concentration, pressure and shear rate. A dynamic filtration equation was developed using a mass balance method based on the cake filtration theory prevailing in the chemical engineering industry. The results of experimental data showed substantial agreement with the filtration equation.

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