FIELD: geophysical investigation of cased wells in oil producing and other industries. SUBSTANCE: method of detection of interval of gas crossflow in casing string-borehole annulus includes neutron-gamma-ray logging over the whole borehole, recording of logs of intensities of back gamma radiation at maximum and fully released annulus pressure determination of interval of gas crossflow by the intensities of back gamma radiation registered at maximum annulus pressure exceeding the intensities of back gamma radiation registered at fully released annulus pressure by the value larger than the error of their recording. EFFECT: higher efficiency.
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