Patent Number: 7,762,337

Title: Riser pipe with auxiliary lines mounted on journals

Abstract: The invention relates to a riser pipe section comprising a main tube (2), at least one auxiliary line element (3) substantially parallel to said main tube (2) and at least two fastening means (7, 8) that connect the ends of said element (3) to main tube (2). The section is characterized in that fastening means (7, 8) allow longitudinal stresses to be transmitted from said element (3) to main tube (2) and in that at least one of fastening means (7, 8) allows at least a rotating motion of said element (3) in relation to said main tube (2), the rotating motion following an axis perpendicular to the plane passing through axis (4) of the main tube and through the axis of auxiliary line element (3).

Inventors: Papon; Gerard (Les Essarts le Roi, FR), Guesnon; Jean (Chatou, FR)

Assignee: Institut Francais du Petrole

International Classification: E21B 29/12 (20060101); E21B 7/12 (20060101)

Expiration Date: 7/27/12018