Method of drilling a subterranean borehole
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United States of America Patent
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Jan 29, 2013
Grant Date -
Mar 24, 2011
app pub date -
Sep 15, 2010
filing date -
Sep 15, 2009
priority date (Note) -
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Abstract
A method of drilling a subterranean well bore using a tubular drill string is described. One embodiment of the method includes the steps of injecting a drilling fluid into the well bore via the drill string and removing the drilling fluid from an annular space in the well bore around the drill string via a return line. The method can also include oscillating the pressure of the fluid in the annular space in the well bore, and monitoring the rate of flow of fluid along the return line.
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