A method is discussed whereby the numerical solution of equations describing the filtration process of drilling fluid may be used for prediction of cake buildup and filtrate volume into a given zone. The data required for the simulation study include estimation of cake permeability during the dynamic phase, filtrate viscosity, cake compressibility and porosity, and pressure differential against the formation.

Application of the technique allows sensitivity analysis of important parameters controlling the filtration process in a given operation. Furthermore, estimation of invasion radius may be made in advance for determination of optimum timing for logging and improvements in log interpretations. This will allow the design of the best mud composition for a given application.

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