Motion Monitoring on semi-submergible drilling rig "GoldStar"

Queiroz Galvao hired the services of Siri Marine during the wet tow of Semi Sub GoldStar.

The marine operations manual of the rig provides limiting accelerations during transit / tow conditions. The limiting accelerations are used to reduce the total risk for the rig. Additional limitations may be given by the Marine Warranty Surveyor for this towing operation.

For this voyage Siri Marine will install on board a Motion Monitoring System which will enable the towmaster on board to monitor the actual motions of the rig during the voyage, use this information in his "Decision Making Process" and give clear information about actual versus allowable motions.

The purpose of the project is:

• To provide the towmaster on board the rig during the voyage with a "Decision Support System" based on rig motions.
• Measurement and real-time display of the actual motions and forces of the rig during the voyage.
• Comparison of actual with maximum allowed motions.
• Storage of the voyage log files for voyage reporting and post-processing of motion data.