Onshore facilities

Onshore facilities will be located in Zavalishina bay, which is located near Teriberka

Onshore part of Shtokman Phase 1, implemented by SDAG, shall include:

  • Onshore section of the trunkline;
  • Gas treatment unit (GTU);
  • Plant for liquefaction of natural gas (LNG);
  • GTU and LNG support infrastructure.

The gas together with gas condensate will arrive from the offshore via double trunkline. The landfalls will be located on the northern shore of the Kola Peninsula in Opasova bay.

The onshore section of the trunkline between the landfall and the slug-catcher at gas treatment unit (GTU) will be buried underground and will be 10km long. Downstream slug-catcher the flow will be separated into two portions: half of the gas will go to GTU, the other to LNG plant for further processing and liquefaction.

The main purpose of the gas treatment unit (GTU) is to separate gas from condensate and treat it for transportation via main pipeline. GTU will be located at some distance away from Zavalishina bay. For the first time in Russia a high-capacity tubular slug-catcher will be used to separate gas from gas condensate. Unit capacity will be 35 mln m³/day.

The treated gas from GTU will be pumped into Murmansk — Volokhov main pipeline, which is a part of the Unified Gas Supply System (UGSS). The recovered condensate will be stabilized, sent to Korabelnaya bay for storage and further shipping.

The plant for liquefaction of natural gas (LNG) includes the following major units:

  • acid gas removal unit;
  • dehydration;
  • demercurization;
  • natural gas liquids recovery;
  • multi-stage natural gas liquefaction;
  • nitrogen removal.

For liquefaction process at −160°С the APCI C3MR technology is used, which has a proven track record in LNG applications worldwide, based on sequential gas compression and cooling using propane and then mixed refrigerant in specific cryogenic heat exchanger. The Shtokman project is the second project in the world using the electrically driven compressors in LNG process. Total capacity of the LNG train will be 7.5 mln tons per annum, thus making the plant one of the largest in the world. After liquefaction, LNG is fed through special cryogenic pipelines for storage and further offloaded onto LNG tankers.

The LNG storage and offloading area includes special full containment tanks, LNG export terminal, boil-off gas recirculation and compression system. Later on, it is planned to expand the tank farm, jetties, and transshipment points as part of Shtokman Phases 2 and 3 developments.

Phase 1 facilities will require about 600 MW of electric power. That equals to the demand in power supply of a city with 1 million inhabitants. The base case is in-house generation of electric and thermal power using high-capacity gas turbines running on off-spec gas inevitably produced during LNG process. Hook-up to external power supply is under consideration as well.

The operations support area will be outside GTU and LNG plant facilities. It will consist of offices, workshops, warehouses, laboratory, fire station, and other facilities required for operation of the whole process complex.

For the operation stage of the project the operation camp will be accommodate up to 1000 people.