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Oil platform

technology Maturity 9-11 Next article →

An oil platform, also known as an oil rig or offshore production platform, is a massive structure used to extract petroleum and natural gas. These valuable resources are trapped within rock formations deep beneath the seabed.

Schemat wydobywania ropy naftowej
Schemat wydobywania ropy naftowej

Most platforms operate on the continental shelf, which is the submerged edge of a continent. However, they can also function in lakes, inshore waters, or inland seas. These structures are vital for global energy production. They often include facilities to house workers, or they may be linked to a separate accommodation platform by a bridge.

Gulf Offshore Platform
Gulf Offshore Platform

The mechanism of an oil platform involves complex engineering to reach resources under the ocean. To begin, a drilling rig penetrates the seabed to reach the oil or gas. Once a well is established, the platform manages the flow of hydrocarbons. Remote subsea wells can be connected to a main platform through flow lines. These connections often include umbilical lines to provide power or control.

Crane testing bags on an offshore support vessel
Crane testing bags on an offshore support vessel

Some platforms even include integrated storage facilities to hold the processed oil before it is transported.

Engineers use several distinct types of structures depending on the water depth. Fixed platforms are anchored directly to the seabed using steel jackets or concrete caissons. Steel jackets consist of tubular steel members piled into the seafloor. Concrete caisson structures, such as the Condeep concept, can include large tanks for oil storage. These can be built near shore and floated to their final location. Fixed platforms are usually economically feasible in water depths up to 1,500 feet.

Oil Platform Base Construction
Oil Platform Base Construction

For deeper water, other designs are necessary.

Other designs include compliant towers, which use slender, flexible towers to handle lateral forces. These are typically used in depths between 1,000 and 3,000 feet. Tension-leg platforms, or TLPs, are floating structures tethered to the seabed. These tethers eliminate most vertical movement. Spar platforms are also moored to the seabed, but they use conventional mooring lines instead of vertical tension tethers.

Devils tower 2004
Devils tower 2004

Finally, semi-submersibles are floating platforms that offer stability in deep water. These are often used by mobile offshore drilling units (MODU) to operate in challenging environments.

The history of offshore drilling shows a steady move from land into deeper seas. In 1891, the first submerged wells were drilled in the fresh waters of Ohio. By 1896, drilling moved into salt water at the Summerland field in California.

Oil wells just offshore at Summerland, California, c.1915
Oil wells just offshore at Summerland, California, c.1915

In 1923, the Bibi Eibat well began production in Azerbaijan. A major milestone occurred in October 1947 when Kerr-McGee completed a well out of sight of land. This proved that drilling could happen far from the coastline.

Tender and offshore oil rig platform, Louisiana
Tender and offshore oil rig platform, Louisiana

Technological leaps have allowed humans to reach incredible depths. In 1955, the "Scorpion" became the first jackup rig, featuring three electro-mechanically operated legs. The first semi-submersible was discovered by accident in 1961 while operating in the Gulf of Mexico. Today, the scale of these operations is enormous. The Perdido hub in the Gulf of Mexico floats in 2,438 meters of water and cost $3 billion to build. The Petrobras America Cascade is even deeper, operating in 2,600 meters of water.

Oil platform Norway
Oil platform Norway

Offshore drilling is a global industry with many important basins. Major areas include the North Sea, the Gulf of Mexico, and the Caspian Sea. Huge fields are also found in the Persian Gulf, such as Safaniya and Marjan in Saudi Arabia. Other significant locations include the coast of Brazil and the waters off West Africa. While these platforms provide energy, they also present environmental challenges. This includes managing the hydrocarbons produced and the materials used during the drilling process.

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🖼️ Images & Media (21)
File:LUN-A.jpg
LUN-A.jpg
File:Crane testing bags on an offshore support vessel.jpg
Crane testing bags on an offshore support...
File:Oil wells just offshore at Summerland, California, c.1915.jpg
Oil wells just offshore at Summerland,...
File:Tender and offshore oil rig platform, Louisiana.jpg
Tender and offshore oil rig platform,...
File:Schemat wydobywania ropy naftowej.svg
Schemat wydobywania ropy naftowej.svg
File:Gulf Offshore Platform.jpg
Gulf Offshore Platform.jpg
File:Types_of_offshore_oil_and_gas_structures.jpg
Types_of_offshore_oil_and_gas_structures.jpg
File:Oil Platform Base Construction.jpg
Oil Platform Base Construction.jpg
File:Devils tower 2004.JPG
Devils tower 2004.JPG
File:View of the Port of Las Palmas from the dock of La Esfinge (3).jpg
View of the Port of Las Palmas from the...
File:龍口海濱.jpg
龍口海濱.jpg
File:Oil platform Norway.jpg
Oil platform Norway.jpg

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