公开(公告)号：US11156037B2

公开(公告)日：2021-10-26

申请号：US16445360

申请日：2019-06-19

申请人： Chevron U.S.A. Inc.

发明人： Antonio C. F. Critsinelis ,  Farzan Parsinejad ,  Matthew Davis Hense ,  Gary Anthony Giordano

IPC分类号： E21B17/01 ,  F16M13/02 ,  H02G9/02 ,  H01F7/02 ,  H01F1/055

摘要： Disclosed are systems for securing a bend stiffener to a riser in an offshore energy production facility. In one system, the lower end of the bend stiffener has a magnet that repels a magnet in a clamp on the riser a distance below the bend stiffener. The magnets repel one another with a force during operation to decelerate falling and prevent contact between the clamp and the bend stiffener. Methods are provided for retrofitting a riser system by adding the magnets. In another system, the riser has an upper portion and a tapered portion immediately below the upper portion. The outer diameter of the tapered portion increases such that the tapered portion can be friction fit into the lower end of the bend stiffener in the event that the bend stiffener is forced down or free falls onto the riser.