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Apparatus in a drill string

United States Patent

July 17, 2007
View the Complete Patent at the US Patent & Trademark Office
An apparatus in a drill string comprises an internally upset drill pipe. The drill pipe comprises a first end, a second end, and an elongate tube intermediate the first and second ends. The elongate tube and the ends comprising a continuous an inside surface with a plurality of diameters. A conformable spirally welded metal tube is disposed within the drill pipe intermediate the ends thereof and terminating adjacent to the ends of the drill pipe. The conformable metal tube substantially conforms to the continuous inside surface of the metal tube. The metal tube may comprise a non-uniform section which is expanded to conform to the inside surface of the drill pipe. The non-uniform section may comprise protrusions selected from the group consisting of convolutions, corrugations, flutes, and dimples. The non-uniform section extends generally longitudinally along the length of the tube.
Hall; David R. (Provo, UT), Dahlgren; Scott (Alpine, UT), Hall, Jr.; Tracy H. (Provo, UT), Fox; Joe (Lehi, UT), Pixton; David S. (Provo, UT)
IntelliServ, Inc. (Provo, UT)
10/ 711,454
September 20, 2004
FEDERAL SPONSORSHIP This invention was made with government support under Contract No. DE-FC26-01NT41229 awarded by the U.S. Department of Energy. The government has certain rights in the invention.