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Composite drill pipe

United States Patent

December 2, 2008
View the Complete Patent at the US Patent & Trademark Office
A composite pipe segment is formed to include tapered in wall thickness ends that are each defined by opposed frustoconical surfaces conformed for self centering receipt and intimate bonding contact within an annular space between corresponding surfaces of a coaxially nested set of metal end pieces. The distal peripheries of the nested end pieces 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 a contact ring in one pipe assembly pierced by a pointed contact in the other to connect the corresponding leads across the joint.
Leslie; James C. (Fountain Valley, CA), Leslie, II; James C. (Mission Viejo, CA), Heard; James (Huntington Beach, CA), Truong; Liem (Anaheim, CA), Josephson; Marvin (Huntington Beach, CA), Neubert; Hans (Anaheim, CA)
Advanced Composite Products & Technology, Inc. (Huntington Beach, CA)
10/ 952,135
September 28, 2004
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.