Productivity Prediction Method of Fracturing Horizontal Wells in Heterogeneity Gas Reservoir

The productivity prediction mathematical model of fracturing horizontal wells in heterogeneity gas reservoir is established and also quantitatively calculated by means of finite element method. In this paper, the model is used to calculate production of a fracturing horizontal well in Xushen gas reservoir of Songliao basin. The results indicate that, without consideration of heterogeneity gas reservoir, the errors of production forecasting results is larger and cannot satisfy the requirement of synchronized production measurements. So the heterogeneity gas reservoir needs to be taken into consideration. The total gas production in different producing pressure drop is obtained by this model and the cure of productivity prediction is drawn. According to the analyses, we obtain that the total gas production of fracturing horizontal well increases with the producing pressure drop increases, and the increase degree becomes smaller.