University of Tehran Journal of Chemical and Petroleum Engineering 2423-673X 46 1 2012 06 01 Investigation of Pressure Pulse Distribution in Porous Media 41 52 1892 10.22059/jchpe.2012.1892 EN Monir Taherkhani Institute of Petroleum Engineering, University of Tehran, Tehran, Iran Peyman Pourafshary Institute of Petroleum Engineering, University of Tehran, Tehran, Iran Journal Article 2011 10 02   Diffusivity equation commonly used for pressure distribution prediction in porous media results from substituting equation of state and continuity equation in Navier-Stokes momentum equation. From mathematical point of view this equation format shows infinite propagation speed for pressure pulse through porous media, which is physically impossible. This issue may caused by numerous assumptions that has been implemented for developing diffusivity equation. However, if we omit two main assumptions of steady state condition and constant velocity and consider linear approximation for velocity field, the pressure propagation differential equation would be hyperbolic which is called Telegraph Equation. The propagation speed is limited for this equation.<br /> In this work, these equations are compared in prediction of pressure pulse propagation in Cartesian coordination with different parameters. The results show that the telegraph equation has minor correction in some cases as: far distances from pressure pulse source, when the fluid has high viscosity and for the rocks with low porosity and permeability; so considering common parameters in hydrocarbon reservoirs, the diffusivity equation has sufficient accuracy for reservoir engineering applications. https://jchpe.ut.ac.ir/article_1892_cfdc75464777d71401f369a7ceb22ff3.pdf