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Composite drill pipe and method for forming same

United States Patent

October 16, 2012
View the Complete Patent at the US Patent & Trademark Office
A lightweight and durable drill pipe string capable of short radius drilling formed using a composite pipe segment formed to include tapered wall thickness ends that are each defined by opposed frustoconical surfaces conformed for self-aligning receipt and intimate bonding contact within an annular space between corresponding surfaces of a coaxially nested set of metal end pieces and a set of nonconductive sleeves. The distal peripheries of the nested end pieces and sleeves are then welded to each other and the sandwiched and bonded portions are radially pinned. The composite segment may include imbedded conductive leads and the axial end portions of the end pieces are shaped to form a threaded joint with the next pipe assembly that includes contact rings in the opposed surfaces of the pipe joint for contact together.
Leslie; James C. (Fountain Valley, CA), Leslie, II; James C. (Mission Viejo, CA), Heard; James (Huntington Beach, CA), Truong; Liem V. (Anaheim, CA), Josephson; Marvin (Huntington Beach, CA)
Advanced Composite Products & Technology, Inc. (Huntington Beach, CA)
13/ 342,952
January 3, 2012
STATEMENT OF GOVERNMENT INTEREST This invention was partly funded by the Government of the United States of America under Cooperative Agreement No. DE-FC26-99FT40262 awarded by the U.S. Department of Energy and the Government of the United States of America has certain rights in the invention.