The Piltun-Astokhskoye-B (PA-B) platform is the largest oil and gas production platform in the Sakhalin-2 project, located 12 km offshore the coast of Sakhalin Island, in the Piltun area of the Piltun-Astokhskoye field. Commercial development of the area began in late 2008.
The topsides of the platform were designed in South Korea and installed on a prepared concrete gravity base, allowing for year-round operation in severe climatic, wave and ice loads. Friction pendulum bearings are installed on the legs to provide for movement of the topsides during seismic activity, thus protecting them from damage.
Each of the four legs supports an integrated structural deck, performing additional process functions: the south-eastern leg serves as a well compartment; the north-eastern leg is used for pipeline risers; the other two legs accommodate auxiliary equipment. The equipment inside the legs is protected from freezing by internal heating systems.
The platform is a fully autonomous asset fitted with all the facilities required for efficient operation, including power generation. The topsides contain equipment and systems for drilling, distribution of hydrocarbons and liquids, chemical storage, and an accommodation block. In addition, the platform is equipped with all the facilities required to bring the oil and associated petroleum gas to saleable condition.
The PA-B platform’s daily design capacity is 9.5 Kt (70 Kbbl) of oil and 2.09 MMcm of associated gas.
Processed oil and associated petroleum gas are delivered through pipelines to the Onshore Processing Facility for further transportation to the Prigorodnoye Oil Export Terminal located in the south of the island.