Method for determining fluid control events in a borehole using a dynamic annular pressure control system
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United States of America Patent
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Oct 29, 2013
Grant Date -
Feb 24, 2011
app pub date -
Aug 13, 2010
filing date -
Aug 19, 2009
priority date (Note) -
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Abstract
A method for determining existence of a borehole fluid control event by controlling formation pressure during the drilling of a borehole includes selectively pumping a drilling fluid through a drill string extended into a borehole, out a drill bit at the bottom end of the drill string, and into an annular space between drill string and the borehole. The drilling fluid leaves the annular space proximate the surface. Existence of a well control event is determined when at least one of the following events occurs: the rate of the selective pumping remains substantially constant and the annular space pressure increases, and the rate of the selective pumping remains substantially constant and the annular space pressure decreases.
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