Percolation characteristics of fractured anisotropic reservoir

Key words:  fractured reservoir  anisotropy  percolation characteristics  eleciric-analogy-modeling experiment

Abstract:

In order to investigate the percolation characteristics of reservoir developed natural fracture，a new electric-analogy-modeling experiment designing method was proposed based on the coordinate transformation principle. And the permeability tensor model of the fractured anisotropic reservoir was established by applying the natural fracture parameters to the reservoir engineering. And a new method of investigating the percolation law and evaluating the productivity of the fractured low-permeability reservoir was formed. The results indicate that, on the one hand, the natural fractures improve the oil well productivity by increasing the formation permeability，on the other hand，the natural fractures decrease the well pattern efficiency and the oil well productivity by increasing the reservoir anisotropy. To drill horizontal well in vertical direction of fracture orientation is beneficial to establish the advantaged percolation field and improve the well productivity.