METHOD FOR IDENTIFYING RELATIVE PERMEABILITY OF POROUS MEDIUM Russian patent published in 2012 - IPC G01N15/08 E21B43/20 

FIELD: oil industry.

SUBSTANCE: invention relates to the study of processes of multiphase filtering of liquids and gases in porous medium, particularly to water-oil displacement and can be used to calculate relative permeability and J-function. The method comprises displacement of the resident agent by the displacement agent from the sample porous medium with frontal and side surfaces. Then the porous medium saturation is measured after the permanent flow is achieved and relative permeability is calculated. During this the resident agent is fed into the porous medium through the side surface of the sample in addition to the displacement agent. The resident agent is randomly distributed with a given discharge rate per length unit. Furthermore, the displacement agent and the resident agent are in gaseous or liquid state. The time of permanent flow achievement is calculated with the following formula where ϕ is the pore content, V is the volume of the porous sample, Q₂ is the resident agent flow rate through the side surface of the porous sample, n is the index of power.

EFFECT: reduced establishing time for permanent flow in two-phase medium (liquid-liquid, liquid-gas, gas-liquid) and simultaneous measurement of stationary distribution of the porous medium (in one experiment).

3 cl, 1 dwg, 1 ex