Dalia (oil field)
Encyclopedia
The Dalia oil field is an oil field
in deepwater block 17, 135 kilometres (83.9 mi) off the coast of Cabinda
, Angola
. The field lies in water depths varying between 1200 and 1500 m (3,937 and 4,921.3 ). Dalia oil field was discovered in September 1997 and brought into production in December 2006.
with interest of 40%, and other partners are Statoil
of Norway
(23.33%), ExxonMobil
of the United States
(20%) and BP
of the United Kingdom
(16.67%).
capable of processing 240000 oilbbl/d, and with a storage capacity of 2 Moilbbl of oil.
The FPSO hull was built in South Korea by Samsung Heavy Industries
and has a hull dimensions of 300 metres (984.3 ft) in length, 60 metres (196.9 ft) in breadth and 32 metres (105 ft) high. On top of this is 29,400 tonnes of processing facilities which was mainly built and installed at DSME
in South Korea. It will have a water injection capacity of 405000 oilbbl/d, water treatment capacity of 265000 oilbbl/d and gas compression capacity of 8000000 cuft/d. There will be a total installed power capacity of 66 MW. The living quarters will hold up to 120 people and can be increased to 190 during shutdowns. The structure has a design working life of 20 years.
The Dalia subsea
production system has 67 wells, consisting of 34 production wells and 30 water injection wells and 3 gas injection wells.
The wells are highly deviated, i.e. they are almost horizontal in the reservoirs. One major aspect of the well programme is the large-scale use of horizontal Christmas trees
designed to allow wells to be drilled through them
These are being drilled with two rigs, Pride Africa and Pride Angola, in tandem for the initial 18 months of the campaign of which will require some 2,500 days in all.
The Dalia field has three main reservoirs and the adjacent Camelia reservoir. These reservoirs were formed more than 25 million years ago by the accumulation of sediment at the mouth of the Congo River. Today, they lie not very far (about 800 metres (2,624.7 ft)) below the seabed, forming reservoirs that contain a viscous (between 21° and 23° API) oil at relatively low temperatures of between 45°C and 50°C. Associated gas will not be flared but reinjected, thus contributing to maintaining the pressure of the field.
The start-up of Dalia coincided with Angola's entry into the Organization of Petroleum Exporting Countries (OPEC). Dalia is projected to produce at its peak about 240000 oilbbl/d of oil.
Oil field
An oil field is a region with an abundance of oil wells extracting petroleum from below ground. Because the oil reservoirs typically extend over a large area, possibly several hundred kilometres across, full exploitation entails multiple wells scattered across the area...
in deepwater block 17, 135 kilometres (83.9 mi) off the coast of Cabinda
Cabinda (city)
Cabinda or Tchiowa, as it is called by the Cabindans, is a city that is located in the Cabinda Province, an exclave of Angola. Angolan sovereignty over Cabinda is disputed by the Republic of Cabinda...
, Angola
Angola
Angola, officially the Republic of Angola , is a country in south-central Africa bordered by Namibia on the south, the Democratic Republic of the Congo on the north, and Zambia on the east; its west coast is on the Atlantic Ocean with Luanda as its capital city...
. The field lies in water depths varying between 1200 and 1500 m (3,937 and 4,921.3 ). Dalia oil field was discovered in September 1997 and brought into production in December 2006.
Operator
Sonangol is the Block 17 concessionaire. Like other developments in the Block 17, the operator is Total S.A.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...
with interest of 40%, and other partners are 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...
of 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...
(23.33%), ExxonMobil
ExxonMobil
Exxon Mobil Corporation or ExxonMobil, is an American multinational oil and gas corporation. It is a direct descendant of John D. Rockefeller's Standard Oil company, and was formed on November 30, 1999, by the merger of Exxon and Mobil. Its headquarters are in Irving, Texas...
of the United States
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...
(20%) and BP
BP
BP p.l.c. is a global oil and gas company headquartered in London, United Kingdom. It is the third-largest energy company and fourth-largest company in the world measured by revenues and one of the six oil and gas "supermajors"...
of the United Kingdom
United Kingdom
The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...
(16.67%).
Facility
The Dalia field has been developed with an FPSOFloating Production Storage and Offloading
A floating production, storage and offloading unit is a floating vessel used by the offshore industry for the processing of hydrocarbons and for storage of oil. A FPSO vessel is designed to receive hydrocarbons produced from nearby platforms or subsea template, process them, and store oil until it...
capable of processing 240000 oilbbl/d, and with a storage capacity of 2 Moilbbl of oil.
The FPSO hull was built in South Korea by Samsung Heavy Industries
Samsung Heavy Industries
Samsung Heavy Industries or SHI is one of the largest shipbuilders in the world and one of the "Big Three" shipbuilders of South Korea...
and has a hull dimensions of 300 metres (984.3 ft) in length, 60 metres (196.9 ft) in breadth and 32 metres (105 ft) high. On top of this is 29,400 tonnes of processing facilities which was mainly built and installed at DSME
Daewoo Shipbuilding & Marine Engineering
Daewoo Shipbuilding & Marine Engineering Co., Ltd ' is the second largest shipbuilder in the world and one of the "Big Three" shipbuilders of South Korea.On 21 February 2011, the A. P...
in South Korea. It will have a water injection capacity of 405000 oilbbl/d, water treatment capacity of 265000 oilbbl/d and gas compression capacity of 8000000 cuft/d. There will be a total installed power capacity of 66 MW. The living quarters will hold up to 120 people and can be increased to 190 during shutdowns. The structure has a design working life of 20 years.
The Dalia subsea
Subsea
Subsea is a general term frequently used to refer to equipment, technology, and methods employed in marine biology, undersea geology, offshore oil and gas developments, underwater mining, and offshore wind power industries.- Oil and gas :...
production system has 67 wells, consisting of 34 production wells and 30 water injection wells and 3 gas injection wells.
The wells are highly deviated, i.e. they are almost horizontal in the reservoirs. One major aspect of the well programme is the large-scale use of horizontal Christmas trees
Christmas tree (oil well)
In petroleum and natural gas extraction, a Christmas tree, or "tree", is an assembly of valves, spools, and fittings used for an oil well, gas well, water injection well, water disposal well, gas injection well, condensate well and other types of wells...
designed to allow wells to be drilled through them
These are being drilled with two rigs, Pride Africa and Pride Angola, in tandem for the initial 18 months of the campaign of which will require some 2,500 days in all.
Reservoir
Dalia is projected to contain about 1 Goilbbl of crude oil (Angola has a projected 13 Moilbbl of recoverable petroleum).The Dalia field has three main reservoirs and the adjacent Camelia reservoir. These reservoirs were formed more than 25 million years ago by the accumulation of sediment at the mouth of the Congo River. Today, they lie not very far (about 800 metres (2,624.7 ft)) below the seabed, forming reservoirs that contain a viscous (between 21° and 23° API) oil at relatively low temperatures of between 45°C and 50°C. Associated gas will not be flared but reinjected, thus contributing to maintaining the pressure of the field.
The start-up of Dalia coincided with Angola's entry into the Organization of Petroleum Exporting Countries (OPEC). Dalia is projected to produce at its peak about 240000 oilbbl/d of oil.