First Marathon Super 300 Jackup Now Drilling In Gulf Of Mexico
The Glomar Baltic I, first Marathon Le- Tourneau Super 300 Class jackup drilling rig, recently began its first drilling assignment in the Gulf of Mexico. The rig, which is being operated by Global Marine Company, wras built at Marathon's Gulf Marine Division in Brownsville, Texas. A new design, the Super 300 is a large jackup designed to work in locations with water depths and environmental conditions too severe for standard 300-foot water depth jackups but not hostile enough to require a Marathon Gorilla Class rig.
The Glomar Baltic I is fitted with the Super 300's optional leg length of 515 feet (the standard length is 448 feet).
In this enhanced configuration, the rig can drill in 350 feet of water with 100-knot winds and 55-foot-high waves.
Like the Gorilla rigs, the Super 300 utilized the Marathon LeTourneau Slotilever™, which allows drilling in both the slot and cantilever positions. With the derrick package over the slot, the rig's drilling mode and survival mode are the same.
The new rig's hull is 270 feet long by 268 feet wide by 28 feet deep. It is designed for a normal elective variable load capacity of 4,250 tons plus 650 tons derrick pull-in load.
The Super 300 is classed +A1 by the Amer- ican Bureau of Shipping and built in accordance with the Mobile Offshore Drilling Unit Regulations of the U.S. Coast Guard. When required by the customer, the Super 300 can be constructed to meet the requirements of the U.K. Department of Energy, the Netherlands Department of Mines, and other regulatory bodies.
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