The Transient Flow Analysis And Numerial Simulation Research Of Multi-stage Fractured Horizontal Well With In Tight Gas Reservoirs

China tight sandstone gas reservoirs have the geological characteristics of low porosity and low permeability,fractures and so on.Multi-stage fractured horizontal well technology has become an important means of development of such gas reservoirs.According to the geological characteristics of tight gas reservoirs,a multi-stage fracturing tight gas horizontal well testing model has been established with the consideration of the natural fracture stress sensitivity and variable conductivity artificial fracture.Through dividing artificial fracture into different segments,Laplace transformation,point source function,perturbation method and superposition principle method are employed to obtain a semi-analytical solution of the model.The tight gas reservoir is divided into unfractured zone and fractured zone,fractured zone regarded as the triple medium and unfractured zone for the dual medium.a new composed productivity calculation model of multistage fractured horizontal well in tight gas reservoir has been established to analyze the productivity characteristics of tight gas reservoir.Since the application of mathematical methods in deriving analytical solution exists many assumptions,the numerical simulation software Eclipse is chosen in order to deeply research the production of fractured horizontal wells.