ACOUSTIC METHOD FOR DETERMINATION OF FLUID CROSSFLOW POINT IN BOREHOLE ANNULUS

摘要

FIELD: oil and gas industry.SUBSTANCE: acoustic method for determination of fluid crossflow point in borehole annulus involves equal movement of acoustic transducer along the borehole and processing of noise signal received at its output, which is used for depth determination of fluid crossflow point. At that in output noise signal of acoustic transducer frequency-stable discreet component fis defined and instant Doppler-beat frequency f(t) is registered as transducer moves along the borehole with equal speed. At the moment when instant Doppler-beat frequency f(t) is equal to discreet component f, time tis recorded and depth hfor noise source is defined against specified mathematical expression.EFFECT: method reduces labour intensity for determination of fluid crossflow point in borehole annulus.2 cl, 2 dwg