Bottom supported jack up rig












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How do jackups work

Jackup platforms are used as exploratory drilling platforms and offshore and wind farm service platforms. Jackups are most susceptible to major damage or loss when they are floating. Jackup platforms have been the most popular and numerous of various mobile types in existence. In , Zapata Offshore , owned by George H. Jackups are towed or moved under self propulsion to the site with the hull lowered to the water level, and the legs extended above the hull. This barge had ten legs which had spud cans to prevent them from digging into the seabed too deep. The total number of jackup drilling rigs in operation numbered about at the end of After the legs are driven and the hull goes into the water, the seawater is dumped overboard and the sequence is begun again. Courtesy Marine Structure Consultants. Marathon Le Tourneau now Le Tourneau has designed and built more of these units than any other designer and builder. Jackup water depth ratings generally use a minimal leg penetration of 15 to 25 ft, which may not be the case in actual operation. Unlike platform rigs, submersibles, and ships, jackups and semis are upgradeable from a technical and commercial standpoint. The concept is to load the legs to a level above that which the unit will encounter in the harshest predicted environment. After preloading, the jacking system is used to raise the entire barge above the water to a predetermined height or "air gap", so that wave, tidal and current loading acts only on the relatively slender legs and not on the barge hull. Jackup rigs can also refer to specialized barges that are similar to an oil and gas platform but are used as a base for servicing other structures such as offshore wind turbines , long bridges, and drilling platforms.

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Description: Courtesy Marine Structure Consultants. Other types of offshore rigs include semi-submersibles which float on pontoon-like structures and drillships , which are ship-shaped vessels with rigs mounted in their center. By using this site, you agree to the Terms of Use and Privacy Policy. The bottom of the hull must have a large enough air gap that the largest wave crest will not hit the hull and turn over the rig. Their key advantages are that they were relatively inexpensive to build and leave no footprint at the drilling location. The jackup is maneuvered self-propelled or by towing into location with its legs up and the hull floating on the water. Then "preloading" takes place, where the weight of the barge and additional ballast water are used to drive the legs securely into the sea bottom so they will not penetrate further while operations are carried out. A jackup rig or a self-elevating unit is a type of mobile platform that consists of a buoyant hull fitted with a number of movable legs, capable of raising its hull over the surface of the sea. If the ocean bottom is soft and consists of clay, it is not uncommon to take 7 or more sequences, with each sequence taking 7 to 12 hours. After preloading, the jacking system is used to raise the entire barge above the water to a predetermined height or "air gap", so that wave, tidal and current loading acts only on the relatively slender legs and not on the barge hull.
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