Arkutun-Dagi: Berkut Offshore Platform

Arkutun-Dagi licence block is the most remote field of the Sakhalin-1 Project

Article

Arkutun-Dagi: Berkut Offshore Platform

For this reason, the Berkut offshore platform was installed to develop Arkutun-Dagi. Commercial production began 2015. Berkut is the largest offshore platform in Russia and when Berkut reaches full design capacity, production will total 4.5 million tons per year.

Berkut is the largest oil and gas platform in Russia. It is located approximately 25 kilometers from shore at a water depth of about 35 meters.

Berkut weighs 200,000 tons and towers almost 130 meters above the sea.  The platform topsides weigh about 42,000 tons and consist of several levels, each with an area comparable to a soccer field. The levels house process and accommodation modules, a drilling rig, auxiliary equipment and more. At the time of installation, it was the heaviest integrated structure for offshore platforms ever installed in the open sea by float-over.

The platform topsides rest on the Gravity Base Structure (GBS) with only four legs visible above the sea surface, but the base looks more like a huge stool turned upside down, with the legs turned upward and the base resting on a prepared area of the sea floor. The reinforced concrete base was manufactured in Primorsky Krai on the docks of the Vostochny Port near Nakhodka. 90% of the construction materials required to build the 160,000 ton base of the platform were procured from Russian suppliers. Concrete and reinforcements were supplied from manufacturing plants in the Far East. Inside Berkut’ s base are countless pipes, utility lines, valves, and cables that assist in the functionality of the gigantic structure.

Berkut, like Orlan, was created to operate under the harsh winter conditions of the region.  The massive GBS is resistant to earthquakes, withstands waves up to 18 meters, ice up to 2 meters thick and extreme temperatures as low as -44°C. Pendulum supports reduce the dynamic impact of seismic vibrations on the platform and are located between the base and the topsides.

A subsea flowline allows the oil and gas produced from Berkut to reach the Chayvo Onshore Processing Facility.

Related content

Phases and facilities

Sakhalin-1's Chayvo, Odoptu, and Arkutun Dagi license blocks, located off the northeastern coast of Sakhalin Island in the Russian Far East, are being developed using a phased approach

Who we are Article

About the project

Sakhalin-1 is comprised of Russian, Japanese, Indian and American participants and is operated by Exxon Neftegas Limited, a subsidiary of ExxonMobil.

Who we are Article

Odoptu

In December 2017, the Odoptu Stage 2 development entered into production phase to fully develop the field’s reserves

Who we are Article

Chayvo

Chayvo license block is being developed both from onshore and offshore facilities

Who we are Article