The heave compensation system is a proprietary system developed in partnership
with Bosch Rexroth. It can be easily installed into any SDC Sonic Drill. The
heave compensation system is specifically intended for lifting and lowering of
drill string loads in rough seas. The system decreases the influence of the
heave of a drilling vessel on the drill bit. Compensation systems are very
commonly used onboard drill ships and semi-submersible drill rigs.
The operator will activate the system only while drilling & while the drill
head is sitting in a neutral position with a drill string connected to the
drive adapter. The heave compensation system cannot be used during make-up
and breakout. Some clients elect to attach a 3rd hydraulic breakout clamp onto
the vessels moon pool for holding the outer casing.
The heave compensation system is a limited system which works off the
existing feed circuit. Activating a toggle switch on the main control
console will activate a separate feed control lever and relief valve
located in a small enclosure at the front of the main console.
The operator must adjust the feed control lever and the relief valve at
the same time which will compensate the feed pressure based on the amount
of tooling weight hanging off the drill head. The heave compensation system
will not automatically adjust itself. It is the operator's responsibility
to make adjustments to the controls which best suit the changing ocean
conditions and/or tooling weights. The drill string weight must not exceed
the systems hold back capacity.
SDC has incorporated numerous Heave Compensation Systems for off shore
drilling exploration projects. Contact Sales for more information.
Heave Compensator - Operator Control Location
Heave Compensator - Operator Controls
SDC550 Off-Shore Exploration Drilling off the coast of New Zealand