Offshore Jack-Up Drill Rig Jobs
A
jackup rig is a barge fitted with long hold up legs that can be lift up or
dropped down. The jackup rigs generally are without engine and towed by tug
boats, or carried by heavy lift ships or may be also self propelled which is shipped
into the work site with its legs raised and the hull sailing on the sea water.
After reaching
at the project position, the legs are jacked below onto the seabed. After that
process of preloading is done, where the load of the barge and extra ballast
water are used to enter the Jackup rig legs firmly into the sea floor in such a
way so that they will not pierce more into sea bed once the operations are commenced.
After
preloading, the jacking arrangement is used to lift up the whole barge on top
of the water to a preplanned height or air gap, so that wave, tidal and current
loading effects only on the relatively metal legs rather than on the vessel
hull.
Present
jacking techniques use a rack and pinion gear assembly where the pinion gears
are driven by hydraulic or electric motors and the rack is attached to the
legs.
Comparatively,
Jackup drilling rigs are used in shallow waters, usually less than 120 metres
i.e, 390 feet of water. Though, an exclusive class of jackup rigs recognized
as premium or ultra-premium jackups are known to have operational capacity in
water depths reaching from 150 to 190 meters or 500 to 625 feet.
Categories
Mobile
offshore Drilling Units-MODU
This kind
of Mobile offshore Drilling rig
is generally used in connection with oil and natural gas drilling. In mobile
offshore drilling rig fleet, jackup drill rig types are mostly used through out
the offshore world. Other kinds of offshore drill rigs are semi-submersibles which
float on pontoon like construction and drill ships, which are ship shaped
vessels with rigs set up in their middle.
I
n all
the drill ships hull, there is an opening known as moon pools through which
these rig drills. Drilling tools required for drilling operation are passed
through these holes. Also divers go into sea through these opening.
Turbine
Installation Vessel-TIV
The Turbine Installation Vessel-TIV rigs
are usually used for offshore wind turbine installation.
Specialized Jackup Barge
Rigs
Specialized barges are also refer to as Jackup rig which are
similar to an oil and gas platform but are utilised as a base for maintenance of
other structures like long bridges, offshore wind turbines and drilling
platforms. Jackup barge rigs may also be used to dismantle ship wrecked at sea.
Comparatively,
Jackup drilling rigs are used in shallow waters, usually less than 120 metres
i.e, 390 feet of water. Though, an exclusive class of jackup rigs recognized
as premium or ultra-premium jackups are known to have operational capacity in
water depths reaching from 150 to 190 meters or 500 to 625 feet. 
n all
the drill ships hull, there is an opening known as moon pools through which
these rig drills. Drilling tools required for drilling operation are passed
through these holes. Also divers go into sea through these opening.
