Condeep
Overview
 
Condeep refers to a make of gravity base structure
Gravity base structure
A gravity-based structure is a support structure held in place by gravity. A common application for a GBS is an offshore oil platform. These structures are often constructed in fjords since their protected area and sufficient depth are very desirable for construction...

 for oil platform
Oil platform
An oil platform, also referred to as an offshore platform or, somewhat incorrectly, oil rig, is a lаrge structure with facilities to drill wells, to extract and process oil and natural gas, and to temporarily store product until it can be brought to shore for refining and marketing...

s developed and fabricated by Norwegian Contractors
Norwegian Contractors
Norwegian Contractors AS was the world leading turnkey concrete gravity base structure supplierin the period of 1974 to 1994. Aker Marine Contractors AS was established in 1995 and is a continuance of the marine activities in Norwegian Contractors AS.Norwegian Contractors AS have worked on...

 in Stavanger
Stavanger
Stavanger is a city and municipality in the county of Rogaland, Norway.Stavanger municipality has a population of 126,469. There are 197,852 people living in the Stavanger conurbation, making Stavanger the fourth largest city, but the third largest urban area, in Norway...

, Norway
Norway
Norway , officially the Kingdom of Norway, is a Nordic unitary constitutional monarchy whose territory comprises the western portion of the Scandinavian Peninsula, Jan Mayen, and the Arctic archipelago of Svalbard and Bouvet Island. Norway has a total area of and a population of about 4.9 million...

. A Condeep usually consists of a base of concrete oil storage tanks from which one, three or four concrete shafts rise. The original Condeep always rests on the sea floor, and the shafts rise to about 30 meters above the sea level. The platform deck itself is not a part of the construction.

The Condeep is used for a series of production platforms introduced for crude oil and natural gas
Natural gas
Natural gas is a naturally occurring gas mixture consisting primarily of methane, typically with 0–20% higher hydrocarbons . It is found associated with other hydrocarbon fuel, in coal beds, as methane clathrates, and is an important fuel source and a major feedstock for fertilizers.Most natural...

 production in the North Sea
North Sea
In the southwest, beyond the Straits of Dover, the North Sea becomes the English Channel connecting to the Atlantic Ocean. In the east, it connects to the Baltic Sea via the Skagerrak and Kattegat, narrow straits that separate Denmark from Norway and Sweden respectively...

 and Norwegian continental shelf
Norwegian continental shelf
The Norwegian continental shelf is the continental shelf over which Norway exercises sovereign rights as defined by the United Nations Convention on the Law of the Sea...

.

Following the success of the concrete oil storage tank on the Ekofisk field, Norwegian Contractors introduced the Condeep production platform concept in 1973.

This gravity base structure for platform was unique in that it was built from reinforced concrete instead of steel, which was the norm up to that point.
Encyclopedia
Condeep refers to a make of gravity base structure
Gravity base structure
A gravity-based structure is a support structure held in place by gravity. A common application for a GBS is an offshore oil platform. These structures are often constructed in fjords since their protected area and sufficient depth are very desirable for construction...

 for oil platform
Oil platform
An oil platform, also referred to as an offshore platform or, somewhat incorrectly, oil rig, is a lаrge structure with facilities to drill wells, to extract and process oil and natural gas, and to temporarily store product until it can be brought to shore for refining and marketing...

s developed and fabricated by Norwegian Contractors
Norwegian Contractors
Norwegian Contractors AS was the world leading turnkey concrete gravity base structure supplierin the period of 1974 to 1994. Aker Marine Contractors AS was established in 1995 and is a continuance of the marine activities in Norwegian Contractors AS.Norwegian Contractors AS have worked on...

 in Stavanger
Stavanger
Stavanger is a city and municipality in the county of Rogaland, Norway.Stavanger municipality has a population of 126,469. There are 197,852 people living in the Stavanger conurbation, making Stavanger the fourth largest city, but the third largest urban area, in Norway...

, Norway
Norway
Norway , officially the Kingdom of Norway, is a Nordic unitary constitutional monarchy whose territory comprises the western portion of the Scandinavian Peninsula, Jan Mayen, and the Arctic archipelago of Svalbard and Bouvet Island. Norway has a total area of and a population of about 4.9 million...

. A Condeep usually consists of a base of concrete oil storage tanks from which one, three or four concrete shafts rise. The original Condeep always rests on the sea floor, and the shafts rise to about 30 meters above the sea level. The platform deck itself is not a part of the construction.

The Condeep is used for a series of production platforms introduced for crude oil and natural gas
Natural gas
Natural gas is a naturally occurring gas mixture consisting primarily of methane, typically with 0–20% higher hydrocarbons . It is found associated with other hydrocarbon fuel, in coal beds, as methane clathrates, and is an important fuel source and a major feedstock for fertilizers.Most natural...

 production in the North Sea
North Sea
In the southwest, beyond the Straits of Dover, the North Sea becomes the English Channel connecting to the Atlantic Ocean. In the east, it connects to the Baltic Sea via the Skagerrak and Kattegat, narrow straits that separate Denmark from Norway and Sweden respectively...

 and Norwegian continental shelf
Norwegian continental shelf
The Norwegian continental shelf is the continental shelf over which Norway exercises sovereign rights as defined by the United Nations Convention on the Law of the Sea...

.

Following the success of the concrete oil storage tank on the Ekofisk field, Norwegian Contractors introduced the Condeep production platform concept in 1973.

This gravity base structure for platform was unique in that it was built from reinforced concrete instead of steel, which was the norm up to that point. The platform was purpose made for the heavy weather conditions and the great water depths found in the North Sea.

Troll A

The Troll A platform is the largest Condeep to date. It was built over a period of four years, using a workforce of 2,000, and deployed in 1995 to produce gas from the enormous Troll oil field
Troll oil field
Troll is a natural gas and oil field in the Norwegian sector of the North Sea, North-West of Bergen, west of the island of Fedje.Although Troll is primarily a gas field – one of the biggest in the North Sea, holding 60% of Norway’s gas reserves – it also possesses significant quantities of oil,...

.

With a total height of 472 meters, Troll A was the largest structure ever to be built and moved. The total weight when launching was 1.2 million tons. 245,000 m³ of concrete and 100,000 tons of steel for reinforcement were used. The amount of steel corresponds to 15 Eiffel tower
Eiffel Tower
The Eiffel Tower is a puddle iron lattice tower located on the Champ de Mars in Paris. Built in 1889, it has become both a global icon of France and one of the most recognizable structures in the world...

s. The platform is placed at a depth of 300 meters. For stability, it is dug 35 meters into the sea floor.

North Sea concrete platforms

Structure Depth Operator and year
The Ekofisk-tank 70 m Phillips
Phillips Petroleum
Phillips Petroleum Company was founded in 1917 by L.E. Phillips and Frank Phillips, of Bartlesville, Oklahoma. Their younger brother Waite Phillips was the benefactor of Philmont Scout Ranch....

, 1973
Frigg CDP1 104 m Total
Total S.A.
Total S.A. is a French multinational oil company and one of the six "Supermajor" oil companies in the world.Its businesses cover the entire oil and gas chain, from crude oil and natural gas exploration and production to power generation, transportation, refining, petroleum product marketing, and...

, 1975
Beryl A Condeep 120 m Mobil
Mobil
Mobil, previously known as the Socony-Vacuum Oil Company, was a major American oil company which merged with Exxon in 1999 to form ExxonMobil. Today Mobil continues as a major brand name within the combined company, as well as still being a gas station sometimes paired with their own store or On...

, 1975
Brent B Condeep 140 m Shell
Royal Dutch Shell
Royal Dutch Shell plc , commonly known as Shell, is a global oil and gas company headquartered in The Hague, Netherlands and with its registered office in London, United Kingdom. It is the fifth-largest company in the world according to a composite measure by Forbes magazine and one of the six...

, 1975
Brent D Condeep 140 m Shell, 1976
Frigg TCP2 Condeep 104 m Elf
Elf
An elf is a being of Germanic mythology. The elves were originally thought of as a race of divine beings endowed with magical powers, which they use both for the benefit and the injury of mankind...

, 1977
Statfjord
Statfjord oil field
The Statfjord oil field is an enormous oil and gas field in the Norwegian sector of the North Sea operated by Statoil.It is a trans-median field crossing the Norwegian and UK North Sea Boundary with approximately 15% being in the UK Continental Shelf waters. At peak production it produced over of...

 A Condeep
146 m Mobil
Mobil
Mobil, previously known as the Socony-Vacuum Oil Company, was a major American oil company which merged with Exxon in 1999 to form ExxonMobil. Today Mobil continues as a major brand name within the combined company, as well as still being a gas station sometimes paired with their own store or On...

, 1977
Statfjord B Condeep 146 m Mobil, 1981
Statfjord C Condeep 146 m Mobil, 1984
Gullfaks
Gullfaks oil field
Gullfaks is an oil and gas field in the Norwegian sector of the North Sea operated by Statoil. It was discovered in 1979, in block 34/10, at a water depth of 135 meters. The initial recoverable reserve is , and the remaining recoverable reserve in 2004 is . This oil field reached peak production in...

 A Condeep
135 m Statoil
Statoil
Statoil ASA is a Norwegian petroleum company established in 1972. It merged with Norsk Hydro in 2007 and was known as StatoilHydro until 2009, when the name was changed back to Statoil ASA. The brand Statoil was retained as a chain of fuel stations owned by StatoilHydro...

, 1986
Gullfaks B Condeep 142 m Statoil, 1987
Oseberg
Oseberg oil field
Oseberg is an offshore oil field with a gas cap in the North Sea located northwest of the city of Bergen on the southwestern coast of Norway....

 A Condeep
109 m Norsk Hydro
Norsk Hydro
Norsk Hydro ASA is a Norwegian aluminium and renewable energy company, headquartered in Oslo. Hydro is the fourth largest integrated aluminium company worldwide. It has operations in some 40 countries around the world and is active on all continents. The Norwegian state holds a 43.8 percent...

, 1988
Gullfaks C Condeep 216 m Statoil, 1989
Draugen
Draugen oil field
Draugen is an oil field in the Norwegian Sea with a sea depth of . It is operated by Royal Dutch Shell. The field has been developed with a concrete fixed facility and integrated topside. Stabilized oil is stored in tanks in the base of the facility...

 Condeep
251 m Shell, 1993
Sleipner A
Sleipner A offshore platform
Sleipner A is a combined accommodations, production and processing offshore platform at the Sleipner East gas field in the Norwegian sector of the North Sea...

 Condeep
82 m Statoil*
Troll
Troll oil field
Troll is a natural gas and oil field in the Norwegian sector of the North Sea, North-West of Bergen, west of the island of Fedje.Although Troll is primarily a gas field – one of the biggest in the North Sea, holding 60% of Norway’s gas reserves – it also possesses significant quantities of oil,...

 Condeep
303 m Norske Shell, 1995
Heidrun
Heidrun oil field
The Heidrun oil field is an oil and gas field discovered in 1985 in the Norwegian sector of the Norwegian Sea, named after the goat Heiðrún from Norse mythology....

 TLP
350 m Conoco, 1995

  • The original concrete structure of Sleipner A
    Sleipner A offshore platform
    Sleipner A is a combined accommodations, production and processing offshore platform at the Sleipner East gas field in the Norwegian sector of the North Sea...

     sunk during trials in the Gandsfjord
    Gandsfjord
    Gandsfjord is a fjord in Rogaland, Norway. Gandsfjord is an arm of Boknafjorden which is adjacent to the cities Stavanger and Sandnes. The entire west side of Gandsfjord is highly developed. The east side of the fjord has many mountains and peaks. In the outer parts of the fjord there are several...

    on August 23, 1991. A new structure was built, and deployed in 1993.
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