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US Patent 7748452 Polymeric microspheres as degradable fluid loss additives in oilfield applications

Patent 7748452 was granted and assigned to Schlumberger on July, 2010 by the United States Patent and Trademark Office.

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Patent abstract

A method of plugging a fracture in a subterranean formation which includes placing into the fracture a composition comprising microspheres or microbeads, wherein the microspheres are created by surface crosslinking of droplets in a water-in-water emulsion. Such microspheres may form a filter cake in the formation. The microspheres may include a chemical agent to be released when the microspheres dissolve.

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