Method and apparatus for cementing while running casing in a well bore
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United States of America Patent
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Mar 21, 2017
Issued Date -
N/A
app pub date -
Oct 22, 2013
filing date -
May 21, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
An improved method and apparatus for dropping a ball, plug or dart during oil and gas well operations (e.g., cementing operations) employs a specially configured valving member with curved and flat portions that alternatively direct fluid flow through a bore or opening in the valving member via an inner channel or around the periphery of the valving member in an outer channel. In one embodiment, the ball(s), dart(s) or plug(s) are contained in a sliding sleeve that shifts position responsive to valve rotation. An optional indicator indicates to a user or operator that a ball or plug has passed a selected one of the valving members.
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