Patent ID: 9470350
Filing Date: 2016-10-18
CPC Classification: E21B,F16L,Y10T

Claim Text:
1. A composite riser having a metal/composite interface comprising: a tubular metal liner comprising at least one tubular metal end connected to the tubular metal liner, the tubular metal end having at least one external groove having a bearing surface, and a base surface; a composite hoop structure within the at least one external groove and formed from hoop fibers wound circumferentially around the at least one tubular metal end, the composite hoop structure configured against the bearing surface and a medial side of the base surface, leaving a distal side of the base surface uncovered by the composite hoop structure; and a plurality of layers of axial fibers laid over the composite hoop structure and the distal side of the base surface, the plurality of layers of axial fibers being oriented generally parallel to a longitudinal axis of the tubular metal liner; and a plurality of layers of hoop and/or helically wound fibers wound over the axial fibers within the at least one external groove, wherein one of the layers of the hoop and/or helically wound fibers is positioned between each adjacent layer of axial fibers for supporting and/or securing the layers of axial fibers.