The Flows Features of Viscous-plastic Fluids in Anisotropic Porous Media

Modern state of the oil extraction is characterized by increase of hard recoverable reserves of hydrocarbon raw material including quasiviscous oils occurring in anisotropic reservoirs. As a rule such oils are the viscous-plastic fluids which flow in porous medium appears after the excess of some limiting gradient of pressure. In the last century the flow law of viscous-plastic fluids in isotropic layers has been offered. This law requires generalization on a case of flow in anisotropic porous media, so long as real reservoirs of hydrocarbons show the anisotropy of reservoir properties. In the present paper are received the flow laws of viscous-plastic fluids in all types of anisotropic porous media. The laboratory method of combined determination of the absolute permeability tensor and the tensor of limiting gradient of pressure for anisotropic reservoirs is suggested. The results of experiments spent by the given method which confirm tensor nature of the limiting gradient of pressure are presented. Presented expressions for flow laws with limiting gradient of pressure can be used in hydrodynamic simulators under the modeling fields of quasiviscous oils.