Methods and systems for drilling
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United States of America Patent
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Nov 21, 2017
Grant Date -
Oct 24, 2013
app pub date -
Oct 11, 2012
filing date -
Apr 12, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A method of automatically placing a drill bit used to form an opening in a subsurface formation on a bottom of the opening being formed comprises a) increasing a flow rate in a drill string to a target flow; b) controlling a flow rate of fluid into the drill string to be substantially the same as a flowrate of fluid out of the opening; c) allowing a fluid pressure to reach a relatively steady state; and d) automatically moving the drill bit toward the bottom of the opening at a selected rate of advance until an increase in measured differential pressure indicates that the drill bit is at the bottom of the opening.
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