METHOD FOR ACCURATE DETERMINATION OF DISPLACEMENT FACTOR AND RELATIVE PERMEABILITY Russian patent published in 2012 - IPC G01N15/08 E21B43/20 

FIELD: physics.

SUBSTANCE: method for accurate determination of the displacement factor and relative permeability involves conducting field pressure transient tests and taking geophysical measurements. An injection well from which drilling has been stopped or was previously used for oil extraction, having a vertical or deviated hole which penetrates the formation from top to bottom is used for investigation. Before injection, geophysical investigations are conducted in the well in order to determine the initial distribution profile of the oil saturation factor. The working fluid is then injected into the well. Bottom-hole pressure, the injectivity profile of the working fluid through section of the formation, as well as the distribution profile of the water saturation factor are measured at different time instances. Measurements are then stopped at the n-th phase when the water saturation factor profile is the same as that measured at the (n-1)th phase. Results of said monitoring are then used to determine the oil displacement factor with the working fluid, as well as the relative permeability function for each characteristic interval of the section of the formation.

EFFECT: high accuracy of determining the displacement factor and relative permeability not at one point but on the entire section of a formation.