Method and apparatus for directional drilling with variable drill string rotation
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United States of America Patent
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Sep 15, 2009
Grant Date -
Mar 12, 2009
app pub date -
Sep 6, 2007
filing date -
Sep 6, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
Apparatus and methodology is provided for directional drilling which avoid the effects of static friction between the drill string and the borehole. The drill string is rotated continuously in one direction during rotating drilling and during steering. During steering, the rotary speed of the drill string is varied within a revolution and substantially similarly for each of a plurality of subsequent revolutions. The drill string is rotated very slowly when oriented at or near the desired orientation to achieve the desired change in direction and then rotated much faster during the balance of each revolution. This angular velocity profile results in drilling at or near a desired orientation for a high percentage of the time it takes for each revolution. Changes in an effective tool-face orientation can be effected by shifting the phase of the velocity profile.
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