The Henry and Netherby gas fields are located in Victorian waters in South East Australia. They have been developed by extending the Casino production system which comprises two subsea wells in the Casino field producing by offshore and onshore pipelines to an onshore gas plant. The entire Henry and Netherby development is subsea, connecting to the Casino pipeline in 70 metres of water.

During the Casino design, provisions were made for future extension of the production system. This paper discusses the provisions made and their effectiveness during the expansion project. The paper also discusses some of the challenges encountered by the project team and how they were overcome.

Specific project challenges included dewatering the pipeline extension without direct access to a production facility, pressurization of the pipeline extension and safe removal of nitrogen from the pipeline extension. The paper also covers the hydrate management of the extension wells, pipeline hydraulics and commercial issues that affected the project development.

Keywords:
pipeline extension, offshore pipeline, plem, wax remediation, pipeline end module, pipeline, flow assurance, igp, upstream oil & gas, wax inhibition
Subjects:
Production Chemistry, Metallurgy and Biology, Pipelines, Flowlines and Risers, Flow Assurance, Inhibition and remediation of hydrates, scale, paraffin / wax and asphaltene, Offshore pipelines, Hydrates
Copyright 2010, Society of Petroleum Engineers
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