Method for eliminating influence of invasion of air-layer drilling liquid on acoustic logging

According to physical geography knowledge, it is known that the speed of an air saturation ground layer is smaller than the speed of a water saturation ground water, a drilling liquid can permeate into a place around a shaft at a distance being 0.5-3 meters after an air layer is opened, rock around...

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Hauptverfasser:	ZENG MINSHAN, WU WEI, CAI JUN
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	DETECTING MASSES OR OBJECTS GEOPHYSICS GRAVITATIONAL MEASUREMENTS MEASURING PHYSICS TESTING
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