Frequent question: How does active heave compensation work?

How does a heave compensator work?

Heave compensator is a system that mitigates transmission of heave movement from ves- sels to the equipment in the vessel. … Heave compensator attenuates movement transmitted from the vessel to the drill string and drill bit ensuring security and efficiency of the offshore drilling process.

How does a crown mounted compensator work?

By supporting the crown block with controlled tension the compensator becomes a motion nullification device by raising and lowering the crown block. This then raises and lowers the traveling block and hook to nullify motion or to isolate rig motion from the drill string.

What is AHC technology?

The essential function of AHC technology is the ability to land and retrieve subsea installations to and from the seabed with precision and accuracy, while minimising the impact caused by the motion of the vessel. …

How does a motion compensator work?

A motion compensator is a device that decreases the undesirable effects of the relative motion between two connected objects. … Not only does the anchor prevent the ship from drifting, but the chain itself dampens the movement of the ship due to undulating motion of the waves.

How does a drill string compensator work?

Drill string compensators are just giant springs between the drill bit and rig. These consist of one or more hydraulic cylinders and air bottles. … If there is no spring element, movement of the drill rig would immediately place enormous forces on the drill bit and pull the drill bit off the bottom of the hole.

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Why do we have motion compensation on the rigs?

Crown-mounted and direct-line compensators work to isolate the heaving motion of the rig from the drill string, while wire rope tensioners apply a constant tension to tension guidelines and podlines to prevent riser buckling. …

What is a compensator in construction?

The CM Compensator

It is used for load leveling of forms up to 30,000 pounds, sliding them out of building floors and into the upper deck by a tower crane.