| 摘要 |
A riser tension protector and coiled tubing lift frame assembly including same for use as a backup heave compensator is described. The assembly includes a frame having an upper frame section adapted for attachment to a top drive system and a lower frame section adapted to interface with a flowhead assembly; and a pair of pneumatic cylinders spaced apart from one another. The pneumatic cylinders have a respective cylinder barrel and a piston rod translatable therein, one end of the piston rods being fixed to the upper frame section and a lower end of the cylinder barrels being fixed relative to the lower frame section. In use, the pneumatic pressure in said cylinders is charged to an over pressure sufficient to cause the piston rods to remain retracted in said barrels when an axial load on the riser is under a predetermined operating load threshold and to extend on an upheave of the floating vessel when the axial load exceeds the predetermined operating load threshold. |
