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BHP Billiton Pyrenees Flying Lead Installation Analysis

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BHP Billiton Pyrenees Flying Lead Installation Analysis

Benefits

Atteris performed flying lead installation analysis for the Pyrenees Development to determine the Minimum Bend Radius (MBR) at the sagbend for a number of wave and current combinations during normal lay. Through this work, Atteris provided the client with an indication of the range of allowable sea states for the installation campaign based on the proposed installation vessel.

Background

The Pyrenees fields are located in the Exmouth Sub-basin of the Northern Carnarvon Basin off Western Australia, approximately 100 km west of Onslow and 40 km north of Exmouth. The water depth at the field ranges from 170msw to 22 0msw.

Work Performed by Atteris

Atteris’ team of engineers:

Developed a flying lead installation model, including vessel RAOs
Performed static analysis of the flying lead installation sequence to determine tensions for layback in the 40m to 80 m range
Performed dynamic analysis of the flying lead installation sequence to determine the MBR at the sagbend
Compared the MBR at the sagbend against the allowable MBR to provide an indication of the allowable sea states.

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