Composition and method of controlling lost circulation from wellbores

摘要: A method and composition for controlling the lost circulation of drilling mud in a wellbore during operation comprising introduction pelletized composition, water-insoluble, water-absorbent polymer bentonite, weight ratio to bentonite range from about 9:1 1:9, preferably 3:1 1:3, into reduce or eliminate loss by sealing porous subterranean formations. The pellets essentially maintain their original size as pass through site circulation. At circulation, accumulate, absorb water swell form an fluid-tight plug. formation is thereby sealed further prevented.