Drilling fluids
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United States of America Patent
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-
Feb 11, 2003
Grant Date -
Jan 24, 2002
app pub date -
Jan 23, 2001
filing date -
Jan 24, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
The invention is a novel drilling fluid additive comprising particles of elastomer which are capable of swelling upon contact with a hydrocarbon fluid. The swelling of the elastomer is gradual, allowing the elastomer to reach the lost circulation zone before significant swelling occurs. Once in the lost circulation zone, the polymer expands sealing off the lost circulation zone. A method for preventing drilling fluid loss is also provided.
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