Method for controlling lost circulation of drilling fluids with water absorbent polymers
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United States of America Patent
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Jan 13, 1987
Grant Date -
N/A
app pub date -
May 28, 1985
filing date -
May 28, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention is a method for reducing lost circulation of aqueous or oil based drilling fluids wherein one or more water absorbent polymers are dispersed in a hydrocarbon fluid which is injected into the lost circulation zone. The hydrocarbon carrier fluid initially prevents water from contacting the water absorbent polymer until such water contact is desired. Once the hydrocarbon slug containing the polymer is properly placed at the lost circulation zone, water is mixed with the hydrocarbon slug so that the polymer will expand with the absorbed water and substantially increase in size to close off the lost circulation zone.
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