FIELD: oil extraction industry.
SUBSTANCE: method includes emitting acoustic impulses and following registration of secondary signals by means of emitter and receiver mounted in upper end of researched element of well construction, which are acoustically connected to body of the latter. Results are interpreted by comparing data received with use of no less than two different working frequencies being in range no lower than 10 kHz.
EFFECT: higher trustworthiness.
1 ex, 4 dwg
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