METHOD OF ASSESSMENT OF RESERVOIR BED POROSITY IN HORIZONTAL WELLS BY IMPLEMETING THREE-PROBE NEUTRON SURVEY Russian patent published in 2009 - IPC G01V5/10 

FIELD: mining.

SUBSTANCE: according to invention there is performed: irradiation of rock with flow of fast neutrons from source of fast neutrons located in well apparatus; separate recording of slow electrons retarded in rock and well with three detectors arranged along axis of well apparatus; forming signals at each quantum of depth proportional to density of absorption of slow electrons in each detector; forming synthetic three-component signal at each quantum of depth with implementation of forming facility, where components of signal are densities of neutron absorption in each of detectors; calibrating obtained synthetic three-component signal for determination of dependence of obtained synthetic signal from porosity and interfering factors; calibrating obtained synthetic three-component signal by means of its measuring in well relative to reservoir bed and to dense reservoir-not bed using obtained results for assessment of porosity in this well; evaluation of collector bed porosity on earlier obtained values of synthetic signal at each quantum of depth in inclined well.

EFFECT: upgraded reliability and noise-immunity of method.

5 cl, 5 dwg