Methods for reducing lost circulation in wellbores
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United States of America Patent
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Jun 24, 2003
Issued Date -
N/A
app pub date -
Jun 14, 2001
filing date -
May 14, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention discloses methods for reducing lost circulation in wellbores. The invention utilizes certain selected water swellable polymers that swell at a rate slow enough to reach the lost circulation zone of a well before those polymers have swollen to an extent that disrupts the drilling process. These selected polymers may be used alone or in conjunction with other lost circulation materials which do not swell or also swell slowly enough to reach the lost circulation zone without interfering with the drilling operation. Mixtures of such materials are also disclosed.
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