Plug launching device
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United States of America Patent
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-
Jan 4, 2000
Grant Date -
N/A
app pub date -
May 21, 1998
filing date -
Dec 7, 1995
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A plug launching device for use in cementing operations in the construction of oil and gas wells, the device having, in certain embodiments, a tubular member with an upper section and a lower section which can accommodate at least a bottom plug and a top plug, the upper section having a floor and the lower section movable relative to the upper section so that when a first dart is pumped into the upper section by cement, the cement is diverted to raise the lower section to release the bottom plug, and when a second dart is pumped into the upper section by hydraulic fluid, it lands on the first dart and the hydraulic fluid is diverted to raise the lower section to further release the top plug.
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