CHARACTERISING WELLBORE DEPTH INTERVAL FROM ROCK FRAGMENTS Russian patent published in 2018 - IPC E21B49/02 G06F19/00 

FIELD: soil or rock drilling; mining.

SUBSTANCE: invention relates to a method and system for characterising a wellbore depth interval from rock fragments. Method includes converting measurements of a bulk rock fragment sample and of a plurality of individual rock fragment samples to a concentration percent, computing a normalisation deviation for each of the plurality of individual rock fragment samples relative to the bulk rock fragment sample, said normalisation deviation being derived from the concentration percent of the bulk and individual rock fragment samples, ranking the plurality of individual rock fragment samples based on a corresponding normalisation deviation, selecting one or more individual rock fragment samples from the plurality of individual rock fragment samples based on a corresponding ranking, characterising the properties of the wellbore depth interval from which the bulk and individual rock fragment samples originated using measured properties of at least some of the selected one or more individual rock fragment samples and presenting to a user the characterised wellbore depth interval.

EFFECT: technical result is an increase in the efficiency of estimating the depth interval of a wellbore along rock fragments.

17 cl, 6 dwg