Monopole acoustic logging while drilling instrument used together with bottom hole assembly, method for measuring shear wave velocity of slow formations
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United States of America Patent
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Sep 22, 2020
Grant Date -
Aug 22, 2019
app pub date -
Oct 9, 2017
filing date -
Jun 7, 2017
priority date (Note) -
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status (Latency Note)
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Abstract
A monopole acoustic logging while drilling instrument used together with a bottom hole assembly and a method for measuring a shear wave velocity of slow formations, wherein the bottom hole assembly includes a drill collar and a drill bit, wherein the monopole acoustic logging while drilling instrument is installed on the drill collar. The monopole acoustic logging while drilling instrument comprises: an acoustic receiver array installed on the drill collar; a monopole acoustic source arranged at the drill collar, wherein the monopole acoustic source is configured to emit acoustic waves with a frequency in a preset frequency range, and the ratio of the outer diameter D1 of the drill collar to the outer diameter D2 of the drill bit is d, and 0.75
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