E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 17/02 (2006.01) E21B 17/00 (2006.01) F16L 9/14 (2006.01) F16L 9/22 (2006.01) F16L 25/00 (2006.01) F16B 7/22 (2006.01)
Patent
CA 2306047
A composite drill pipe (200) has an improved means of attaching a metal end fitting (211) to a composite tubular member (212) using corresponding annular grooves (230, 231) in the metal end fitting (211) and the composite tubular member (212). In addition to annular grooves for axial loads, a plurality of axial grooves (210) can also be included to accommodate greater torsional loads. The composite pipe body (200) can also include a buildup (220) made of a compliant rubber layer (221), a composite overwrap (225), and a wear pad (222) in order to reduce the effective buckling node spacing to even further increase the axial load capability.
La présente invention concerne une tige de forage composite (200) dans laquelle un moyen amélioré permet de fixer un raccord d'extrémité métallique (211) sur un élément tubulaire composite (212) grâce à des rainures annulaires correspondantes (230, 231) formées dans le raccord d'extrémité métallique (211) et dans l'élément tubulaire composite (212). Outre les rainures annulaires destinées à résister aux charges axiales, on peut également inclure plusieurs rainures axiales (210) qui permettront de supporter de plus grands efforts de torsion. Le corps de tige composite (200) peut également comprendre un habillage (220) composé d'une couche de caoutchouc souple (221), d'une enveloppe composite (225) et d'une plaque d'usure (222) afin de réduire l'espacement effectif entre les noeuds anti-flambage et d'augmenter davantage la capacité de résistance aux charges axiales.
Grant Prideco L.p.
Ridout & Maybee Llp
Spyrotech Corporation
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