WELLBORE CIRCULATION ASSEMBLY
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United States of America Patent
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Issued Date -
Feb 24, 2011
app pub date -
Apr 23, 2010
filing date -
Aug 18, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
In some embodiments, a circulation assembly can direct all or substantially all fluid downstream in a drill string in a first mode of operation, and some or all fluid to an annulus in a second mode. Operation of the circulation assembly can be repeatedly changed between the modes of operation. In some embodiments, the circulation assembly can comprise other modes wherein fluid is apportioned between the annulus and the downstream drill string.
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