Abstract: This paper analyzes the K_roB_oμ_o function form, establishes its general functional relations to pressure, from which obtains the well inflow performance equations and general formula in saturated and unsaturated reservoirs. These equations can either be inverted into classical Vogel and Fetkovich equations or into generalized Vogel one under some condition. Their theoretical and universal properties are demonstrated in oilfeld application study, and the results are reliable and good for popularization.

Key words: well performance, Junggar basin, production rate, equation, study