THE PRODUCTIVITY EVALUATION MODEL OF THE STEPPED HORIZONTAL WELL IN THIN INTERBEDED RESERVOIRS

On the basis of the potential superposition, a coupling flow model of the pay zones in stepped hprizontal wells in thin interbeded reservoirs is estabished, and in the model, the interference between reservoir flowing through porous media of pay zones and pipe flowing coupling and branching in well bore is considered, the productivity evaluation method for stepped horizontal wells considering coupling flowing of pay zones is put forward. The dual stepped horizontal well productivity calculated with the established coupling model is 64.26 m3/d, comparing with 60.19 m3/d of the practical productivity of thewell, the calculation error of the coupling model is 6.76%, and the error calculated with horizontal well solution equation is as high as 26.71%.