They are fabricated on land. Typically they mobilized (moved) to location by barges. A jackup rig may be assembled in pieces, with the jacket or the rig structure being installed first, and then the topsides (all housing and equipment that rests on the structure) is installed second, by large cranes. See related link.
A semi-submersible, like the Deepwater Horizon, may be towed by tugboats to its location. See second related link.
Oil rig oil Derick
There is not one, but there numerous oil rigs in the Gulf of Mexico. Their purpose is to pump the oil from the oil deposits located deep within the sea bed in that region.
Oil deposits were found beneath the ocean, too far from the shore to drill from the land. Eventually someone had the bright idea to go and produce these rigs that drill at sea and the first oil rig was born. So, oil rigs were invented to pump the oil located beneath the sea bed far from shore.
Most oil rig platforms today do not float. The platform is usually positioned atop several pillars that extend to the bottom of the sea bed on which they are located. Newer technology however, has developed barges that contain oil drilling equipment. These newer barges do float but must rely on precise electronics to keep them positioned within a couple of feet about the drill site on the sea bed.
toukiai
Pipes under sea
Piper Alpha
Yes and No The "derrick" is the drilling tower which is part of the complete oil platform (which could be moored at sea and have crew quarters etc) which is the "oil rig"
yes oil is available under the sea , theres lots of plates of oil under the sea bed
They are built on land and towed to sea to the drilling site where the oil or gas is.
Piper Alpha
The key features of the Red Sea rig include advanced drilling technology, high capacity for oil extraction, and a robust safety system. Compared to other offshore drilling platforms, the Red Sea rig is known for its efficiency in extracting oil and implementing stringent safety measures to prevent accidents and protect the environment.