Patent ID: 7628568

Claim:
A method for installing a subsea flowline and riser assembly on a sea floor, comprising: (a) providing a flow-line having a flowline axis and an end connected to a hinge-over joint, and a riser having a riser axis and an end connected to the hinge-over joint such that the axes of the riser and flowline extend substantially parallel to each other; (b) lowering an end of the flowline located opposite from the hinge-over joint to the sea floor; (c) lowering the end of the flowline being connected to the hinge-over joint to the sea floor; (d) connecting the hinge-over joint to a foundation installed in the sea floor; (e) rotating the riser about the hinge-over joint such that the riser axis is substantially perpendicular to the flowline axis; and (f) after the riser is rotated about the hinge-over joint such that the riser axis is substantially perpendicular to the flowline axis, connecting a subsea jumper between a flowline opening formed in the flowline and a riser opening formed in the rise that the riser is in fluid communication with the flowline.