Patents Examined by Chrsitopher M. Koehler
  • Joining expandable tubulars
    Patent number: 7181821
    Abstract: A method of joining expandable tubulars includes joining the tubulars by forge welding and flushing a reducing flushing gas around the heated tubular ends during at least part of the forge welding operation such that oxides are removed from the forge welded tubular ends and the amount of irregularities between the forge welded tubular ends is limited.
    Type: Grant
    Filed: July 17, 2003
    Date of Patent: February 27, 2007
    Assignee: Shell Oil Company
    Inventors: Mark Wilson Anderson, Johannis Josephus Den Boer, Anthony Thomas Cole, Klisthenis Dimitriadis, Jan Erik Vollebregt, Djurre Hans Zijsling