Method for controlling lost circulation of drilling fluids...

Details Method for controlling lost circulation of drilling fluids... Method for controlling lost circulation of drilling fluids...

E - Fixed Constructions

21

B

31/21

E21B 33/138 (2006.01)

Patent

CA 1259788

METHOD FOR CONTROLLING LOST CIRCULATION OF DRILLING FLUIDS WITH WATER ABSORBENT POLYMERS 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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