ACG centralisers

centraliser

Aquaterra Energy has secured a contract to design and install 260 centralisers for BP's latest development on the West Chirag platform in the Azeri-Chirag-Guneshli (ACG) oil fields in the Caspian Sea. The contract covers pre-engineering the casing requirements and devising a centraliser package for the tieback operations with delivery in 3Q 2013.

The West Chirag platform has 48 drilling slots, of which 20 are 'tieback slots'. Up to 17 wells will be tied back to the platform during BP's pre-drilling programme and will require centralisation.

A range of centraliser designs will be delivered, including 22in conductor guide eccentric (pictured) and fixed blade centralisers, stop collars and internal casing 133/8in centralisers.

The centralisers will provide a critical interface between the jacket structure of the platform and the well system and will ensure concentricity between inner casing strings and outer conductor strings. They will be designed to withstand the maximum lateral and axial loads that can be experienced during pipe running, installation and operation of the wells.

The centralisers will also use a thermally sprayed aluminium coating system with sacrificial anodes for the conductor guide eccentric centralisers to meet the platform's design life of 25 years.

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