Abstract: For the facts that affecting factors of production are inadequately realized and that stimulation effectiveness appraisal is far from perfect for horizontally fractured wells，therefore，the affecting factors of production and stimulation effectiveness appraisal for horizontally fractured wells need to be deeply researched.Combining reservoir engineering theory and numerical simulation technology,considering the factors of fracture conductivity change with time and elastic expansion energy and so on,which has an influence on post fracturing production,under theory premise of flowing characteristics for horizontally fractured wells during production operation,by using 2D cylindrical coordinate model,the pressure equations and saturation equations of reservoir and fracture system are established for horizontally fractured wells with water cut reservoir.The finite difference method is applied,and these equations are discretized，and Visual Basic language is used to develop the software for resolving above problems.Calculating results show that,the development software can be used to analyze fracture factors and layer factors that affect the production,and calculate post fracturing stimulation effectiveness for horizontally fractured wells,and the achieved results of the analysis and calculation have important guiding meaning for fracturing design to shallow oil and gas reservoir.

Key words: horizontally fractured wells, affecting factors, stimulation effectiveness, numerical simulation, finite difference method