Marathon Introduces New Super 300 Jackup For Harsh Environments

Marathon's new Super 300 selfelevating offshore drilling platform, introduced during the 1981 Offshore Technology Conference, is designed to meet an offshore industry need for a jackup compatible with harsh environments too severe for standard 300-foot water depth rigs, but not hostile enough to require a "Gorilla" rig.

Like Marathon's Gorilla, the Super 300 will have both cantilever and slot drilling capabilities.

The Super 300 is engineered to survive 60-foot waves and 100- knot winds in 300 feet of water.

Its ample variable load capacity makes this jackup suitable for work in areas where frequent resupply of consumables is impracticable.

With its slot and cantilever drilling c o n f i g u r a t i o n s , Marathon's newest jackup is capable of operating on those frontiers of offshore drilling where frequent storms or other climatic conditions presently hinder resupply and prohibit exploration or development activities. The Super 300 drilling pattern allows full design storm rating for exploratory wells drilled through the slot. Conventional cantilever drilling can be carried out in lesser weather conditions. In the cantilevered position, the derrick can be extended 45 feet past the stern and 12 feet on either side of the centerline. This results in a total drilling pattern of 70 by 24 feet.

The Super 300 incorporates field-proven features such as the rack and pinion elevating system used for more than 20 years on all Marathon jackups. This system uses four, six-high gear units for each square leg to provide a constant jacking speed of 90 feet per hour. The constantly engaged pinion gears of this system provide an a d d i t i v e upward and downward fail-safe drive force as the rig is raised or lowered.

Overall length of the Super 300 is 270 feet, while the overall width is 250 feet. With a hull depth of 28 feet, the unit is bigger and heavier than Marathon's Class 116 jackup and can carry more variable and fixed load—up to a total of 10,500,000 pounds.

In an optional version of the Super 300, the 443-foot-long legs can be lengthened to 510 feet to allow drilling in 350-foot waters.

Maximum storm conditions for this special configuration are 55- foot waves and 100-knot winds.

Marathon Manufacturing Company is the leading manufacturer of mobile offshore jackup drilling rigs, and is a multiproduct company manufacturing materialshandling equipment, fabricated metal products, steel buildings, white oils, batteries, and consumer goods, and provides civil e n g i n e e r i n g and construction services. Marathon Manufacturing is a wholly owned subsidiary of The Penn Central Corporation.

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Maritime Reporter Magazine, page 12,  Jul 1981 Massachusetts

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