Abstract: For the stress sensitive reservoir, the change of reservoir pressure can result in the decline of porosity and permeability and affect the flow feature and rule, so the relative permeability curves’ shape will change. The prerequisite of reservoir engineering research is to obtain the relative permeability curves under different reservoir pressure. The pore network technology is one of the effective methods to predict and calculate relative permeability.Based on the technology and considering the stress sensitivity, the dynamic models of pore’s microscopic structure characteristic parameters are established, the variation of relative permeability curves under the change of reservoir
pressure is calculated and the experiment data is fitted. It is verified that the method can be used for the calculation of relative permeability for the stress sensitive reservoir, and the necessary parameter can be given for the study of
reservoir engineering.

Key words: stress sensitivity, relative permeability, pore network, characteristic parameter of microscopic structure, dynamic change, experiment