Drill string compensator

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"active heave compensator" redirects here. For other uses, see active heave compensator (disambiguation).

A drill string compensator, also known as an "active heave compensator", is a device that sits between the traveling block and hook on an offshore oil drilling rig and moves up and down via pneumatic cylinders to compensate for the heaving motion of the rig caused by waves and tides. The drill string compensator helps the drill bit keep even pressure on the bottom of the hole as drilling takes place.

Drill string compensators must adjust for

  • the movement of the ship or rig
  • the continually changing weight of the drill string due to pipe being added or taken off
  • the changing velocity of the drill string as drilling takes place

[edit] External links

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