Continuous circulating sub for drill strings
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United States of America Patent
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Sep 30, 2014
Issued Date -
N/A
app pub date -
Jun 16, 2011
filing date -
Jun 18, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A system and method for maintaining continuous flow through a drill string during drill pipe connection includes establishing drilling fluid flow axially through the length of a tubular sub attached to the top of a drill string. The sub is then engaged with a collar disposed at least partially around the perimeter of the sub so as to define an exterior flow path along the exterior of the sub. Radial flow is then initiated into the sub through said collar and along said exterior flow path. Axial flow is then terminated through the length of the tubular sub while maintaining radial flow into the sub. A pipe joint is then attached to the top of the tubular sub, axial flow is reestablished through the length of the tubular sub, radial flow is terminated into the sub, and the collar is disengaged from the sub.
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