Definition:
Drill String Compensator
Subject Area 1:
Drilling & Operations
Remarks:
The motion compensator is mounted between the traveling block and hook, and is connected to the deck-mounted air pressure vessels (APVs) via standpipes and a hose loop. The DSC isolates the heaving motion of the vessel from the drill string. It minimizes wear between the drill string and the blowout preventer, marine riser and casing strings. Shaffer DSCs, like other Shaffer motion compensation equipment, use the hydro-pneumatic operating principle. DSCs are furnished with operating stroke lengths of 15, 18, 20 or 25 feet, depending on rig design and application.