This book presents a new percolation theory for fluid flow and electric current in heterogeneous porous media. Several models for different types of flow are developed. These models are applied in multi-phase flow in porous media, petrophysical investigations of rock properties, and effects of electric current treatment and acoustic treatment on well production. Audience: This volume is of interest to petroleum engineers, scientists and engineers in reservoir simulation, reservoir characterization, chemical engineering, petroleum and chemical software engineering, postgraduates and PhD students in petroleum engineering, geophysics, geology and chemical engineering.