Golden eagle (offshore drilling rig) - Russia's largest offshore oil and gas drilling platform, designed to develop Arkutun-Dagi, the third field of the Sakhalin-1 project. The platform is located 25 kilometers from the northern part of Sakhalin Island , offshore in the Sea of Okhotsk [1] . The platform was put into operation on June 27, 2014 [2] . The sea depth at the installation site is about 33.6 m.
History
Golden Eagle is part of the Sakhalin-1 international project aimed at the extraction of hydrocarbons from the deep sea, as well as from the coast. The Sakhalin-1 project provides for the development of three deposits - Chayvo , Odoptu and Arkutun-Dagi, located on the northeast shelf of Sakhalin Island in the Sea of Okhotsk. It is assumed that the life cycle of the project will last until 2040-2050 [3] .
The Berkut platform was built specifically for the extraction of resources under rather severe conditions. The platform is able to withstand 18-meter waves, withstand temperatures up to -44 C ° and pressure of ice fields up to two meters thick [4] . During the construction of the platform, for the first time in the world, a seismic protection system was applied that can withstand an earthquake with a power of nine points without loss of operability.
During the construction, the latest technologies were applied. In particular, Far Eastern scientists conducted research on the effects of the Okhotsk Sea ice on the platform and made recommendations for protecting the structure. Prior to this, similar platforms were built using a metal ice-protection belt. To implement this project, a new protection technique was developed using a concrete ice protection belt. This technology was applied for the first time, providing the project with a qualitatively new protection against the effects of ice, as well as reducing the costs of manufacturing metal belts [5] .
During the installation of the upper base of the platform, a unique logistic operation was carried out to deliver it to the final target at a distance of more than 2600 km. In the manufacture, delivery and installation of the upper fundamental structure, several world industry records were established, in particular, installation in the open sea by the thrust method [6] .
Design
The Berkut platform consists of a reinforced concrete base of gravity type and a steel upper structure with drilling, technological and residential modules. The base of the platform is a monolithic waterproof reinforced concrete structure with a size of 134.0 x 101.4 m and a height of 13.4 m, including four columns 54.6 m high and 25.6 m in diameter to support the upper structure [7] . The base of the gravitational type of the platform was erected by a floating method and is a monolithic prestressed concrete structure in the form of a caisson and columns with tension of bundles of cables “on concrete”. The caisson consists of a flat bottom plate, exterior and interior walls, as well as a flat top plate. In the lower part of the caisson, a system of intersecting steel skirts is installed, embedded in the bottom plate and buried in the ground of the base due to its own weight.
Four cylindrical columns is divided into drilling, riser, storage and auxiliary. To ensure the gaps between the columns required for the passage of the barge, the columns in certain areas are oval.
The work of the platform is provided by an autonomous power system, which includes four 60 MW gas turbine units operating on associated gas separated on the platform, with the possibility of switching to diesel fuel if necessary. A spare circuit of three diesel generators with a total capacity of 5.4 MW is also provided, which provides an autonomous mode of operation of the platform with zero emissions into the environment.
Platform Features
- Base plate: 134.0 x 101.4 m and a height of 13.4 m
- Support height: 54.6 m
- Diameter of a support: 25.6 m
- Platform base weight: 156 730 t
- Top structure weight: 42,000 t
- Number of wells: 45
- Drilling radius: up to 7 km
Performance
The development of the Arkutun-Dagi field added up to 4.5 million tons of oil to the annual production of the Sakhalin-1 project [8] .
Notes
- ↑ Rosneft and ExxonMobil installed the unique Berkut platform on the Sakhalin shelf . TASS. Date of treatment June 10, 2019.
- ↑ Elena Krivyakina | Komsomolskaya Pravda website. The largest oil platform Was launched in the Sea of Okhotsk . KP.RU - Komsomolskaya Pravda website (June 27, 2014). Date of treatment June 10, 2019.
- ↑ The largest in Russia oil and gas production platform Berkut Was put into operation . TASS. Date of treatment June 9, 2019.
- ↑ A unique Berkut oil platform Was delivered to Sakhalin . Russian newspaper. Date of treatment June 10, 2019.
- ↑ James Baker. This 200,000-ton titan is now the largest oil rig in the world (unspecified) ? . Gizmodo. Date of treatment June 10, 2019.
- ↑ The Golden Eagle drilling platform was put into operation . www.rosneft.ru. Date of treatment June 10, 2019.
- ↑ Anatomy of the Golden Eagle (English) (unopened) ? . Date of treatment June 10, 2019.
- ↑ Rosneft launched the world's largest oil platform, Berkut . Life.ru (June 27, 2014). Date of treatment June 9, 2019.