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Concentric pipes expanded at the pipe ends and method of forming Number:7,438,132 from the United States Patent and Trademark Office (PTO) owispatent

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Title: Concentric pipes expanded at the pipe ends and method of forming

Abstract: A method of forming a wellhead including: drilling a wellbore; positioning an outer casing at least partially within an upper portion of the wellbore; positioning a first tubular member within the outer casing; expanding at least a portion of the first tubular member into contact with an interior surface of the outer casing; positioning a second tubular member within the outer casing and the first tubular member; and expanding at least a portion of the second tubular member into contact with an interior portion of the outer casing; wherein, after expanding the portions of the first and second tubular members into contact with the interior portion of the outer casing, at least a portion of the second tubular member is positioned within the first tubular member; and wherein, after expanding the portions of the first and second tubular members into contact with the interior portion of the outer casing, the first tubular member and the second tubular member define a passage there between.

Patent Number: 7,438,132 Issued on 10/21/2008 to Cook,   et al.

Inventors: Cook; Robert Lance (Katy, TX), Brisco; David Paul (Duncan, OK), Stewart; R. Bruce (The Hague, NL), Ring; Lev (Houston, TX), Haut; Richard Carl (Sugar Land, TX), Mack; Robert Donald (Katy, TX), Duell; Alan B. (Duncan, OK)
Assignee: Shell Oil Company (Houston, TX)
Appl. No.: 10/421,682
Filed: April 23, 2003

Related U.S. Patent Documents
Application NumberFiling DatePatent NumberIssue Date
09523468Mar., 20006640903
60124042Mar., 1999

Current U.S. Class: 166/380 ; 166/207
Current International Class: E21B 29/00 (20060101)
Field of Search: 166/380,207-216,379 72/370.06 29/283.5,243.518,243.5,238,237 405/184.4,184.5,184.2

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