Drill string shutoff valve
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United States of America Patent
Stats
-
Jul 19, 2005
Grant Date -
Jun 17, 2004
app pub date -
Dec 17, 2002
filing date -
Dec 17, 2002
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A valve assembly connects into a drill string for opening and closing the inner passage within the drill string. The valve member moves between the open and closed positions in response to axial movement of the drill string. The valve member has an upper portion and a lower portion. A valve member and valve sleeve are located within an inner passage. Lifting the drill string causes the upper portion to move upward relative to the lower portion, bringing along with it the valve member, while the valve sleeve remains stationary with the lower portion, opening the valve.
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