Subsea HPHT Developments – a case study

12 March 2014 Aberdeen Evening Meeting

Chairman Steve Duthie, Shelf Business Stream Manager Technip

Flyer

Report

Key Considerations in HP/HT Subsea Pipeline Design
Ian Matheson, Atkins
Despite a 20 year track record of development in the North Sea, the design of HP/HT subsea pipeline systems remains a challenging exercise. Although many of the challenges to be faced are common, each field requires a bespoke design approach in order to fully evaluate the issues and develop a concept which meets the given operational conditions over the life of the asset.
The typical issues faced by the HP/HT pipeline system designer, such as flow assurance, pressure containment, materials selection and pipeline mechanical response.
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Alder: Essentials of Subsea HPHT Tie-back Development
Ian Stewart, Chevron
The Alder field is located in the Central North Sea, UKCS Block 15/29a. Alder lies in 152m of water approx.
28km west of the Britannia platform. The reservoir lies at a depth of 4480m and contains gas condensate at high temperature and pressure (12,200psia and 305oF). The field is being developed as a single well tie-back to Britannia Bridge Link platform via a 28km PIP pipeline.
This presentation aims at providing an overview of some of the engineering challenges and the design of the subsea facilities to manage them. These include; Tree Selection, Pressure Management, Thermal Management, Flow Assurance, Pipeline Integrity Management.

Reelable Bulkheads within Pipe in Pipe
Angus McRae, Technip
Over a number of years Technip have installed over 50 reeled Pipe-in-Pipe systems; covering a wide range of pipe sizes, steel material grades and installation water depths. Integral to the system are end bulkheads that close the annular gap between the inner and outer pipes, thereby ensuring the integrity of the insulation system within. Originating from development work carried out over a decade ago Technip have, in recent years, incorporated several reelable bulkhead solutions within Pipe-in-Pipe systems to serve a variety of functions. The solutions that have been developed, and the main activities required in the development of a reelable bulkhead solution are discussed.