Assessment of fatigue of a subsea pipeline including analysis of dents

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The scope A major operator was planning to re-develop two of their existing fields in the United Kingdom continental shelf (UKCS). It was anticipated that the re-development would result in greater production yields and increase the life of the field. Two import/export trunklines transported produced gas and, as a result of the re-development, the throughput …

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Decommissioning of an onshore pipeline network

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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 …

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Pipeline cleaning sequencing for decommissioning

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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 …

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Oil export pipeline lifetime extension

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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 …

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Lifetime extension assessment for a condensate pipeline

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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 …

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Lifetime extension assessment for two pipeline networks

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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 …

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Lifetime extension assessment of nine pipelines

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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, …

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Decommissioning of a North Sea platform and subsea infrastructure

Case Studies / ,

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 …

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