Abstract:With the exploration and development of unconventional oil and gas reservoirs such as low permeability oil, tight oil and tight gas, the study of percolation characteristics in near-wellbore area becomes the focus. Compared with the traditional numerical simulation method, the streamline simulation method decouples the three-dimensional problem into a one-dimensional problem along the streamline, which has the advantages of fast calculation speed and high visualization degree of simulation results. However, most of the streamline simulation techniques have been used in the full filed so far, and there are few studies on the streamline simulation of the near-wellbore. The purpose of this study is to streamline modeling in the near-wellbore area, using a polar coordinate system with logarithmic radial spacing, and taking smaller radial steps in closer regions to more accurately capture the flow characteristics in the near-wellbore area. By studying the heterogeneity of permeability in the near-wellbore and the influence of different completion methods on the streamline geometry, the impact on the productivity of the well is studied. The results show that the Pollock method cannot accurately simulate the streamline path in a perforated well. The semi-analytical streamline simulation method is the only known method for streamline simulation in the near-wellbore, and it is better than Pollock method in pressure distribution.