Abstract: A coiled tubing lift frame assembly for use as a back-up heave compensator on a floating vessel 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. The assembly also includes a pair of hydraulic cylinders spaced apart from one another, the hydraulic cylinders having a respective cylinder barrel and a piston rod translatable therein with free end of the piston rods being fixed to the upper frame section. The assembly also includes a piston accumulator disposed adjacent to a first of the hydraulic cylinders and in fluid communication therewith via a hydraulic fluid line and an air accumulator disposed adjacent to a second of the hydraulic cylinders and in fluid communication with the piston accumulator via a pneumatic fluid line.

Abstract: A heave compensation and tensioning apparatus for use on a floating vessel during “locked-to-bottom” operations is provided. The apparatus includes a pair of hydraulic cylinders that are fixed to a lower section of a frame. Respective free ends of piston rods of the hydraulic cylinders are operatively associated with an upper section of the frame. A pair of accumulators are in communication with pressure vessels and the cylinders using a pneumatic fluid line and a primary hydraulic fluid line, respectively. A control valve assembly allows the piston rods to retract or extend in response to, and to compensate for, heave of the floating vessel. An isolation valve can hydraulically lock the piston rods. In this way, the heave compensation and tensioning apparatus forms a rigid link and can be employed as a secondary or back-up heave compensator for a primary heave compensator.

Abstract: 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, a free 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.

Abstract: 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, a free 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.

Abstract: A coiled tubing lift frame assembly for use as a back-up heave compensator on a floating vessel 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. The assembly also includes a pair of hydraulic cylinders spaced apart from one another, the hydraulic cylinders having a respective cylinder barrel and a piston rod translatable therein with free end of the piston rods being fixed to the upper frame section. The assembly also includes a piston accumulator disposed adjacent to a first of the hydraulic cylinders and in fluid communication therewith via a hydraulic fluid line and an air accumulator disposed adjacent to a second of the hydraulic cylinders and in fluid communication with the piston accumulator via a pneumatic fluid line.

Abstract: A heave compensation and tensioning apparatus for use on a floating vessel during “locked-to-bottom” operations is provided. The apparatus includes a pair of hydraulic cylinders that are fixed to a lower section of a frame. Respective free ends of piston rods of the hydraulic cylinders are operatively associated with an upper section of the frame. A pair of accumulators are in communication with pressure vessels and the cylinders using a pneumatic fluid line and a primary hydraulic fluid line, respectively. A control valve assembly allows the piston rods to retract or extend in response to, and to compensate for, heave of the floating vessel. An isolation valve can hydraulically lock the piston rods. In this way, the heave compensation and tensioning apparatus forms a rigid link and can be employed as a secondary or back-up heave compensator for a primary heave compensator.