Method employing liquidized sand for controlling lost circulation of drilling fluids
Patent 4964465 Issued on October 23, 1990. Estimated Expiration Date: 
November 6, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 6, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorApplicationNo. 432011 filed on 11/06/1989US Classes:166/295, Organic material is resin or resinous166/300, Chemical inter-reaction of two or more introduced materials (e.g., selective plugging or surfactant)175/72, Prevention of lost circulation or caving405/267, Filling substerranean cavity (e.g., underground wall)523/130Composition for plugging pores in wells or other subterranean formations; consolidating formations in wells or cementing a well or process of preparingExaminersPrimary: Suchfield, George A.Attorney, Agent or FirmInternational ClassesE21B 033/138E02D 003/12 AbstractThe disclosed invention is a method for reducing lost circulation in wellbores. In the method, a liquidized sand, comprised of a particulate material, a resin, and a carrier fluid comprising a surfactant mixed with air, is injected into the wellbore. The liquidized sand is then allowed to solidify in the lost circulation area, thereby sealing the area and reducing or eliminating the lost circulation.Other References
Field of SearchProviding porous mass of adhered filter material in wellWith explosion or breaking container to implode Chemical inter-reaction of two or more introduced materials (e.g., selective plugging or surfactant) Producing foam or gas in well by foaming or gas producing material Prevention of lost circulation or caving Filling substerranean cavity (e.g., underground wall) Composition for plugging pores in wells or other subterranean formations; consolidating formations in wells or cementing a well or process of preparing | |
