Steerable drilling method and system
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United States of America Patent
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Feb 12, 2019
Grant Date -
Nov 10, 2016
app pub date -
Dec 19, 2014
filing date -
Jan 2, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A method for steerable drilling is presented herein. The method includes inducing a drill string rotation modulation system to modulate a rotational speed of a drill string during each revolution of the drill string. The method also includes inducing a Measuring-While-Drilling device (MWD) to transmit repeatedly measured orientations of a Bottom Hole Assembly (BHA) between the drill string and the drill bit to the drill string rotation modulation system to steer a drill bit with a tilted toolface in a deviated drilling direction. The MWD divides each revolution of the BHA into a plurality of angular intervals, and transmits average percentages of time that the BHA rotates through the angular intervals to the drill string rotation modulation system to provide the modulation system with information about an angular orientation of the deviated drilling direction.
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