METHOD OF DETERMINING CHANGE IN PROPERTIES OF BOREHOLE AREA OF RESERVOIR-BED UNDER INFLUENCE OF DRILLING SOLUTION Russian patent published in 2015 - IPC G01V9/00 

FIELD: mining operations.

SUBSTANCE: core-sample is taken from the borehole wall, and at least one part is split from the core-sample. The split parts of the core-sample are irradiated with the longitudinal acoustic waves and the speed of wave propagation in each of the split parts is measured. The empirical relationship is chosen between the speed of the longitudinal acoustic wave and the porosity for a given lithology type of the rock, and porosity is determined of each irradiated split part of the core-sample, using the measured speeds of acoustic longitudinal wave and the selected relationship between the speed of the longitudinal wave and porosity for a given lithology type of the rock. The value of change in porosity is determined by comparing the obtained values of the irradiated split parts of the core-sample and value of reference porosity, typical for this lithology type of the rock.

EFFECT: provision of opportunity to determine changes in rock properties of borehole area of bed created as a result of exposure to the pollutant.

32 cl, 1 dwg