Introduction A client of ours – one of the major operators – had plans to re-develop two of their existing fields in the United Kingdom Continental Shelf (UKCS). The objectives of the re-development were to increase production yields and increase the life of the field. Part of the redevelopment would result in increased throughput for …
Assessment of fatigue of a subsea pipeline including analysis of dents Read More »
The scope As part of the decommissioning hydrocarbon free phase our client, a North Sea operator, planned to clean a 20” interfield gas/condensate pipeline and a 3” MEG pipeline to both be later cut subsea and left in situ on the seabed. The pipelines ran from a normally unmanned installation and tied into a live …
The scope of work A major operator asked us to develop a decommissioning strategy for the out of service pipelines of an onshore network. The pipeline network was in an especially environmentally sensitive area of the UK, featuring sites of special scientific interest, special protection areas, and national nature reserves. Due to the sensitive location …
The problem Centrica E&P were planning the decommissioning process for the A-fields area comprising of 3 fixed platforms, 7 subsea structures and 20 pipelines and umbilicals. Jee was contracted to assess the options for flushing, pigging and conditioning of the pipeline infrastructure and to advise an optimised base case cleaning methodology to be taken forward …
Pipeline cleaning sequencing for decommissioning Read More »
The problem Our client asked us to complete a lifetime extension assessment for a 12” pipeline system in the North Sea, which was approaching the end of its original design life. The assessment included the typical time-dependent and independent studies carried out in accordance with ISO/TS 12747. Key aspects of this assessment were the internal …
The scope A major operator had identified the need to continue operation of an 18” condensate pipeline in the North Sea beyond its design life. The operator requested our team to conduct a lifetime extension (LTE) assessment to determine requirements for extending the design life of the pipeline. The solution We completed an assessment of …
Lifetime extension assessment for a condensate pipeline Read More »
The scope A major operator had identified the need to continue operating the pipelines in two major North sea fields. The operator asked us to perform lifetime extension (LTE) assessments for all the pipelines approaching or beyond their initial design life. This included: 1 x 10” production pipeline with piggybacked 4” gas lift pipeline 1 …
Lifetime extension assessment for two pipeline networks Read More »
The problem Our client, a major global operator, was concerned about the effects of vortex induced vibration (VIV) on freespans of their pipelines. The operator wished to investigate whether the spans were subject to fatigue damage and if so, whether this fatigue had a significant effect on the design life of the pipelines. The pipelines …
The scope of work Jee was approached by a major operator to carry out lifetime extension assessments (LTE) for nine of their pipelines situated in the North Sea. The pipelines were approaching the end of their design lives and our client wished to continue production. The work plan Jee completed the work in two stages, …
The scope Our client, a Southern North Sea operator, wished to flush and disconnect all flowlines and control umbilicals from each of the associated subsea wellheads and manifolds within a field.The operation involved live well abandonment using a diving support vessel (DSV) to enable the well P&A activities and pipeline decommissioning/abandonment to progress separately. The …
Decommissioning of a North Sea platform and subsea infrastructure Read More »
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