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ENGINEERING: Drilling SCR Control System Upgrade

 



Recent Western Cape Business News

ELECTROWAVE Cape and Transocean recently successfully completed the Phase II upgrade of the Drilling SCR Control System on the Deepwater Expedition (DWE).

The upgrades are extensive and have resulted in an extremely reliable drilling system (drawworks, top drive, rotary table and mud pumps). The drawworks control systems were the most extensively revised with decreased trip times and incorporating some of the most advanced safety systems on the market today.

Between 1999 and 2008, the rig experienced several gearbox failures due to inadequacies in the original control system, which placed excessive stress on the gears.

The fault in friction brake control was identified in 2007 by TOI Project and the course of the remedy to this particular issue had been presented.

Results measured between 2008 and 2010, with the Phase I system have shown no stress or pitting on the gear teeth, due to the highly sophisticated revised friction brake control algorithm.

Based on the Siemens S7-300 range of PLC Controllers and the Siemens Simoreg DC drives the control system optimizes the Trip Time, by allowing the travelling gear assembly to move at maximum speed and only braking at the ‘last minute’, based on the available torque from the motors and the hookload.

All this is achieved while ensuring minimum stress on the braking system and gearboxes.


 
 
 
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