Pumpdown valve plug assembly for liner cementing system
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United States of America Patent
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-
Nov 26, 2002
Grant Date -
Jan 3, 2002
app pub date -
Aug 20, 2001
filing date -
Apr 3, 2000
priority date (Note) -
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Abstract
Method and apparatus are disclosed for use in cementing a tubular member which is run into a borehole using a drill string. A landing collar is attached to the tubular member near the bottom of the tubular member, and the landing collar has an opening at least five inches in diameter. A liner wiper assembly is releasably suspended from the drill string. The liner wiper assembly comprises a lower liner wiper plug comprising float valves and an upper liner wiper plug. With the method and apparatus of the present invention, plugging problems are minimized.
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