Drill String Float

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A check valve in the drill string that will allow fluid to be pumped in to the well but will prevent wellbore fluids from entering the drill pipe.

Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards

A check valve in the drill string that will allow fluid to be pumped into the well but will prevent flow from the well through the drill pipe.

Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global Standards

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