Productivity Prediction Methods in Multi-branch Vertical Fracture Wells

The unstable percolation of multi-fracture vertically fractured wells was studied,a productivity forecast model was established for a single medium and multi-branch vertical fractured wells.The numerical solution was carried out for the model,the influence of dynamic fracture parameters on the typical curve of productivity was plotted and analyzed.The results show that fracture branch number,its half length,non-dimensional conductivity and its skin factors affected productivity forecast greatly.The more the branch number is,that is,the higher the fracture density is,the higher the productivity is,the farther the fracture extends,the productivity is improved by seepage improvement.The greater the fracture conductivity is,the more fluid is provides to the wellbore,the greater the productivity is.Productivity is greatly constrained by its skin factors,the increase of skin factor would seriously reduce the non-dimensional production.