MODULAR MULTI-WORKSTRING SYSTEM FOR SUBSEA INTERVENTION AND ABANDONMENT OPERATIONS

摘要

A system for intervention or abandonment of a subsea wellbore having a production tree above waterline includes: a tower; riser joints; and a riser handler: operably coupled to the tower so that the riser handler may be raised and lowered along rails of the tower, and operable to handle the riser joints for assembly thereof; a skid connectable to skid rails of a production platform; a bottom frame connected to the skid; and a tower floor connected to the frame and having rails and runners: operably coupled to the rails at a top of the tower floor and operable to: receive the tower in the horizontal position, raise the tower to the vertical position, and move the tower along the rails; and a rotary jack: connectable to the production tree via one or more of the riser joints, and operable to raise, lower, and rotate a jointed tubular string.