Jackup Rig

Hijijack-up rigatawa hiji unit anu bisa naék sorangan(self-elevating)nyaéta jenis anjungan usik anu diwangun tinalambungngambang dilengkepan kalayan sajumlah suku nu bisa usik,is a type o fitted with a number of movable legs, sanggup naékeun lambung di luhureun permukaan sagara. Lambung apung matak unit bisa ngangkut sarta kabéh mesin kapasang ka lokasi anu dipikahayang. Sanggeus di lokasi lambung ditaékkeun nepikeun ka posisi anu diperlukeun di luhur permukaan sagara dirojong ku sukuna anu nicak kana dasar sagara. Suku ti unit éta bisa dirarancang pikeun nembus dasar sagara, bisa dilengkepan bagéan rada ngagedéan atawa mangrupa pondasi.Umumna rig Jack-up henteu bisamaju sorangangumantung kanakapalatawakapal angkat beuratpikeun transportasi.
Anjungan Jack-up dipaké minangka anjungan pengeboran eksplorasi sarta layanan anjungan leupas basisir. Jackup platforms have been the most popular and numerous of various mobile types in existence. Anjungan Jack-up usik geus jadi anu pangpopulérna sarta sagala rupa jenis. Total jumlah rig Jack-up 'Pangeboran' anu operasi baris kira-kira 540 dina ahir taun 2013.
Jack-up rigs are so named because they are self-elevating—with three or four movable legs that can be extended (“jacked”) above or below the hull. Jack-ups are towed to the site with the hull, which is actually a water-tight barge that floats on the water’s surface, lowered to the water level, and the legs extended above the hull. When the rig réaches the drill site, the crew jacks the legs downward through the water and into the séa floor (or onto the séa floor with mat supported jack-ups). This anchors the rig and holds the hull well above the waves.
A jackup is a floating barge fitted with long support legs that can be raised or lowered. The jackup is maneuvered (self-propelled or by towing) into location with its legs up and the hull floating on the water. Upon arrival at the work location, the legs are jacked down onto the séafloor. Then "preloading" takes place, where the weight of the barge and additional ballast water are used to drive the legs securely into the séabottom so they will not penetrate further while operations are carried out. 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.
modérn jacking systems use arack and piniongéar arrangementwhere the pinion géars are driven by hydraulic or electric motors and the rack is affixed to the legs.
Jackup rigs can only be placed in relatively shallow waters, generally less than 400 feet (120 m) of water. However, a specialized class of jackup rigs known as premium or ultra-premium jackups are known to have operational capability in water depths ranging from 500 to 625 feet.
This type of rig is commonly used in connection withoil and/or natural gas drilling. There are more jackup rigs in the worldwide offshore rig fleet than other type of mobile offshoredrilling rig. Other types of offshore rigs includesemi-submersibles(which float on pontoon-like structures) anddrillships, which are ship-shape vessels with rigs mounted in the centers. These rigs drill through holes in the drillship hulls, known as moon pools.
This type of rig is commonly used in connection withoffshore wind turbineinstallation.
Jackup rigs 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 asoffshore wind turbines, long bridges, and drilling platforms.