Abstract

Abstract Bayu-Undan is an existing gas field located North West of Darwin comprising of two main platforms, a satellite platform and an export pipeline to the Darwin LNG facility operated by ConocoPhillips. Phase 3 of the Bayu-Undan development included the lay of two flexible pipelines and one umbilical. The umbilical was installed by a leading seabed-to-surface EPIC contractor utilising a multirole construction and diving support vessel in September 2014, which presented a number of specific challenges: The umbilical system was unusual for the following reasons: ?Free-hanging catenary of umbilical to avoid in-place rigid spools (*)?Shallow water depth of J-tube bellmouth?Umbilical ancillaries that were designed before installation challenges were fully understood?The proximity of J-tube and lay corridor to the flare bridgeDetailed engineering on the following topics was completed to address the installation challenges: ?Installation Analysis of different methods for comparison, using a leading finite element based hydrodynamics simulation software?Design of bespoke stern-mounted horizontal lay spread?Rigging design for product limit conformanceThe following factors influenced a successful offshore campaign: ?Good weather?Smooth deck handling of umbilical?Good interface between vessel and platform team This paper presents a case study of the engineering and installation activities and provides lessons learnt for the entire operation. (*) the "dynamic" umbilical will be further refered as "free-hanging" umbilical as, being fixed both ends, it didn't experience any real dynamic behaviour.

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