Abstract: Using the general principle of Fair s model, this paper first presents a mathematical mode of complex well test analysis in view of the effects of skin, wellbore storage and phase redistribution in a dual media composite reservoir. Laplace-space solutions for this model are obtained by Laplace transformation, and then the type curves for the modern well test analysis are also obtained by numerically inverting methods. This paper analyzes the effects of every relative parameters on the type curves and the dynamic chracteristics of its pressure. This method eleminates the multisolution problems associated with type curve analysis and possible misinterpretations of pressure data which might result from not recognizing the phase redistribution in pressure build-up test and the composite reservoir behavior.

Key words: Well test analysis, Multiple media, Complex reservoir, Type curves