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CT TComp CT Offshore Motion Compensation System

Protect wellhead integrity during deepwater CT operations.

Safer, more efficient heave compensation and wellhead stress management

The CT TComp CT offshore motion compensation system has three versatile operating modes. Its 15-ft titanium stress joint allows movement during operations and relieves stress on the wellhead. The CT TComp system automatically maintains riser load and stress joint flexibility at optimum levels.

Jacking frame mode

The vertical structure of the jacking frame is made up of the base of the BOP crash frame, which also acts as the base for the CT mast system. The jacking frame base is designed to sit on 12-ft centers with center loading up to 160,000 lbf [711,700 N], allowing it to span large well-bay slots or sit across skid beams on spars, distributing load across the platform deck.

Tension-lift frame mode

Assembled in one or two pieces, the CT TComp system can also act as a 350-ton tension-lift frame that transmits riser load from the blocks around the CT equipment. Conventional frames require all CT equipment to be assembled after the frame is raised, requiring valuable time and risking injury to personnel. The modular CT TComp system can be assembled and swung into place with one lift.

Internally compensated tension-lift mode

Since spars do not usually have compensated blocks, the driller is forced to monitor and adjust for load on the blocks during the entire CT operation. However, the CT TComp system monitors load and adjusts automatically. A 15-ft titanium flex joint absorbs any stress caused by horizontal misalignment, eliminating undue stress on the riser or wellhead.

APPLICATIONS

• Functions as a heave-compensated jacking frame;
• Serves as a tension-lift frame on semisubmersibles and drillships;
• Allows simultaneous wireline or slickline operations without rigging down the CT equipment;
• Performs heave compensation when blocks are not compensated in the derrick;
• Provides compensation on spars after the rig is demobilized.

ADVANTAGES

• Preassembly onto three skids;
• Compensation for 7 ft of vertical heave;
• Efficient single-bolt clamp connections for BOPs and risers;
• Class I, Division II–certified electrical system;
• Automatic wellhead monitoring and maintenance within acceptable stress envelope;
• Two fall arrestors and handrails on all walkways.

Thoughtful design elements add safety and save time

• Connection time reduced to 5 minutes from 45 minutes per connection by using a 15,000-psi riser and BOP Grayloc single screw connector;
• Hydraulic connections are reduced to 4 from 25;
• Stabbing winch saves up to 2 hours and eliminates a major HSE hazard;
• Hydraulically actuated gooseneck saves up to 90 minutes during rig up;
• Hydraulic connections are frame mounted to reduce the number of connections during module assembly;
• Guy wire winches and hydraulic hose and cable reels reduce deployment time and increase safety.

X-11 Modular Offshore CT Unit

Adapt to offshore structures, improve safety, and reduce footprint.

The X-11 modular offshore CT unit was developed as a flexible, fit-for-purpose system that is easily adaptable for many offshore structures including platforms, barges, spars, floaters, and tension-leg platforms. The X-11 unit works with CT sizes ranging from 1 in to 2 in, and changing from one CT size to another is safer, easier, and more efficient.

Modular in design, the hydraulic power pack, the control cabin, and the transport baskets are built in standard shipping containers, and the control cabin can stack on top of the hydraulic power pack. This design reduces the total weight and footprint of the entire CT system.