Repsol Sinopec Resources UK has achieved first gas from the Cayley field in the Montrose Area redevelopment project in the Central North Sea.

Cayley is the third and final discovery of the Montrose Area redevelopment project. Cayley, Godwin and Shaw discoveries are expected to have gross incremental production of around 40,000 boepd at peak levels.

The new discoveries will help to extend the life of the Montrose facilities beyond 2030, which became operational in 1976.

Montrose Area Redevelopment (MAR) is said to be the major capital project, which integrates the development of three new fields such as Godwin, Cayley and Shaw and new bridge-linked production platform (BLP) connected to the Montrose Alpha to offer additional process and plant support facilities

Godwin field was already developed through an extended reach well from the Arbroath platform, while the Cayley and Shaw fields were developed as subsea tie-backs to the BLP.

The project is expected to generate around 100 million boe of additional production through life extension of fields.

Montrose and Arbroath general manager Brian Winton said: “Safe and successful delivery of these fields is a great achievement for Repsol Sinopec and underlines the transformation of our business.

“With the support of our shareholders and our partner Marubeni we have overcome significant technical and legacy challenges to safely maximise economic recovery from these historic fields and facilities.”

Repsol Sinopec Resources UK is the operator of the project with a working interest of 58.97%, while Marubeni Oil & Gas (U.K.) is the sole partner.

Repsol Sinopec Resources UK is a joint venture of Repsol and Addax Petroleum UK, , a wholly-owned subsidiary of China Petrochemical Corporation (Sinopec Group). Headquartered in Aberdeen, it exclusively operates in the UK North Sea. It holds interests in 49 fields on the UK Continental Shelf.