A jackup drilling rig is a bottom-supported MODU consisting of a triangular hull and three legs and a jacking system. Very early versions of jackups were square or rectangular and could have a number legs ranging from four to as many as six, or in one case, eight legs.
Briefly, a jackup rig is towed to the wellsite, its legs are lowered by the jacking system to the seafloor and the hull is elevated (or jacked up) until it is above the water, providing a stable work platform for drilling or other operatio
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