Steel Lazy Wave Risers – A Step Change in Riser Technology for NWS – Tze King Lim, Principal Engineer, Perth
15th March 2018 ⋅ 11:50 – 13:20 ⋅ Perth Convention Exhibition Center
Offshore oil and gas exploration in the North West Shelf (NWS) has matured over the years leading to a rise in deep water activity (800m+) off the shelf. The increased water depth in these fields, requirement of long service lives and large diameter export and production risers naturally lead projects to consider steel catenary risers (SCRs) as a more feasible alternative to the traditional FPSO developments with flexible risers. The use of SCRs is proven to be highly reliable based on numerous field developments worldwide. However, the Western Australian offshore environment presents challenging riser design requirements including directional swell seastates, calcareous soils and in some reservoirs sour service conditions which can all be challenging for SCR fatigue design. In this presentation, the steel lazy wave riser (SLWR) is explored as a viable option for deep water developments offshore Australia. The use of a lazy wave riser precludes the need for low motion floaters such as spars and expensive riser solutions such as hybrid riser towers. It can also limit the requirement of expensive and inhibiting fatigue mitigation activities such as corrosion resistant alloy cladding, upset ends, weld grinding and vessel movement programs. The presentation will provide an overview of the SLWR configuration, design requirements and drivers and will be compared to a conventional SCR in terms of strength and fatigue response, constructability and installability. 2H are currently leading the STREAM JIP which is being conducted to understand the level of conservatism in SCR/SLWR design in light of structural monitoring data from several risers. The scope of this JIP and potential value addition to SCR/SLWR design in Western Australia is also presented.
More information: https://aogexpo.com.au/