CSO completes pipeline repairProjects and Operations // July 28, 2000
It is the first time that the Sunrise 2000 has undertaken this kind of operation.
The rigid 8in gas export pipeline, originally laid and commissioned by Coflexip Stena Offshore in 1998 from CSO Apache, was damaged during anchor handling operations, approximately 2km from its deepest extremity in a water depth of 570m and halted production on the P-21 platform.
Due to the urgent requirement to resume production, 1,590m of the rigid pipeline were replaced with a CSO Brazilian made flexible pipes. The flexible pipelines were recently demobilised from a neighbouring field upon completion of a pilot production project.
The damaged rigid 8" gas export line was first cut subsea, before recovery to the deck of the Sunrise 2000, utilising a pipeline recovery system specially developed and built by CSO for contingency purposes on previous rigid pipeline installation campaigns undertaken by CSO.
On the surface a flange was welded to the pipeline, and the flexible line was then connected to the flange. The rigid pipeline and the flexibles were laid down and the flexible line subsequently reconnected to the P-21 platform.
Frédéric Delormel, Managing Director of CSO's Brazilian entities, stated : "The completion of this important repair was performed successfully by CSO with the maximum utilisation of existing assets and very low additional cost. It also demonstrates, oncemore, the fact that flexible pipe can be re-utilised".