heave compensator

heave compensator

[′hēv käm·pən‚sād·ər]
(petroleum engineering)
A motion compensator on a floating offshore drilling rig that moves with vertical motion to maintain a constant pressure on the drilling bit.
References in periodicals archive ?
The drill string is decoupled from the surface motion of the ship by a heave compensator, a huge shock absorber built into the derrick so that cores can be cut and lifted smoothly.