FIELD: well survey, particularly measuring depth or liquid level.
SUBSTANCE: method involves arranging acoustic wave source near well bore cavity and installing acoustic wave receiver from opposite side thereof in immediate proximity to well bore cavity, wherein acoustic wave source may generate acoustic signal on pre-selected frequency with predetermined signal strength and provides change of above frequency, acoustic wave receiver may detect substantial acoustic signal strength decrease as frequency changes; determining frequency corresponding to detected substantial acoustic signal strength decrease and calculating well bore cavity depth from above frequency.
EFFECT: increased reliability and accuracy of well bore cavity depth determination.
15 cl, 6 dwg
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