Posted on 19.06.2008 - 10:00 UTC in GENERAL NEWS by Rons_ROV_Links
The intervention was completed in partnership with WellOps South East Asia and Schlumberger, both of which were integral to the success of the operation.
Alasdair Cowie, CEO of TSMarine explained: "The world record water depth for subsea wireline intervention from a monohull vessel is 377 meters. In our first ever subsea well intervention project we operated in a water depth of 372 meters, a significant achievement within this hugely successful project."
John Edwards Regional Director of TSMarine's Asia Pacific operations added: "The success of this project is a culmination of over two years of planning and engineering, working closely with our customer Woodside Energy and our primary subcontractors. Achieving wireline runs with significant success rates, and reaching downhole well depths of 1450 meters from the Harmony is an extremely pleasing result and is of fundamental importance for the future of our contract with Woodside Energy.
"In addition to the operational success, we completed the project with an outstanding HSE performance record. It shows that proper planning and preparation will deliver great business and safety outcomes. The two go hand in hand."
The project was completed in four stages - detailed engineering, mobilization, subsea tree deployment, and wireline well intervention. Conventionally xmas tress would be run from a drilling rig using rigid riser and a hydraulic umbilical to supply locking and testing capability.
From the Havila Harmony, the trees were run using the vessels 150 tonne active heave compensated crane and a simple mechanical running tool. Locking and testing was supplied by the vessels ROV systems, which were fitted with a specially developed hydraulic power and tooling pack. Hanger and deep-set plugs were removed by slick line intervention using Wellops subsea lubricator (SID) and Schlumberger Wireline Services.
The Havila Harmony is on long-term charter to TSMarine and was delivered in March 2007.
She is configured to undertake subsea decommissioning; rigless well intervention services, and subsea construction support activities and has a comprehensive safety case accepted by NOPSA, Australia's National Offshore Petroleum Safety Authority, covering these and more activities.
Built to the new and demanding "Clean Comfort V" Norwegian standards, the ship conforms to the highest level of environmental class conditions required of vessels of this type in the offshore industry sector.
Following a recent £53 million investment, TSMarine expects to grow its own fleet of subsea decommissioning and rigless intervention vessels to five by late 2009, taking earnings to more than £100million.