Nine Years Operational Experience of the Vega Field – Design, Experience, and Lessons Learned
- Stephan Hatscher (Wintershall Norge AS) | Maxim Kiselnikov (Wintershall Norge AS) | Luis Ugueto (Wintershall Norge AS) | Bård Norheim (Wintershall Norge AS) | Viggo Olsen (Wintershall Norge AS) | Eva Malmanger (Wintershall Norge AS) | Atle Alvestad (Wintershall Norge AS)
- Document ID
- Society of Petroleum Engineers
- SPE Norway One Day Seminar, 14 May, Bergen, Norway
- Publication Date
- Document Type
- Conference Paper
- 2019. Society of Petroleum Engineers
- 3 Production and Well Operations, 7.2.1 Risk, Uncertainty and Risk Assessment, 3.2.7 Lifecycle Management and Planning, 7 Management and Information, 3.2 Well Operations and Optimization, 7.2 Risk Management and Decision-Making, 4.2 Pipelines, Flowlines and Risers, 2.6 Acidizing, 4.3.1 Hydrates, 2 Well completion, 4.2 Pipelines, Flowlines and Risers
- production optimization, tie-back, subsea, operational experience
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- 225 since 2007
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The Vega field is a gas condensate / volatile oil asset located in the Northern part of the North Sea. It comprises three subsea templates, daisy-chained on a 52 km long subsea multiphase flowline to the Gjøa host platform. The high temperature, high pressure field was developed by Norsk Hydro and Statoil and came onstream in 2010; it came under operatorship of Wintershall in 2015. A lot of operational experience was gained within those years. The paper will reflect on the assumptions that led to the design of the asset and juxtapose this with the findings after first oil. Within this, especially the subject of paraffin precipitation will be highlighted. This was perceived as the highest risk to the asset upon development. Later field life, however, showed no indication of wax precipitation at all.
Furthermore, and especially since the takeover by Wintershall, production optimization and prolonging field life has been a strong focus. The paper will showcase several aspects of this, like re-vitalizing wells through acid stimulations, extending lifetime with an infill well campaign, a new spare part strategy, or chemical optimization on the continuous hydrate inhibition cocktail. Moreover, it will also display further activities to extend lifetime even more by changes in the hydrate philosophy.
The story shows that with fresh eyes and new approaches, also smaller fields can be optimized efficiently, leading to increased lifetimes and improved economics.
|File Size||1 MB||Number of Pages||11|
Hatscher, S., Kiselnikov, M., Acid and Scale Inhibitor Squeeze Treatments on two Subsea Gas Condensate Wells: Design of Subsea Connection, Treatment, Wells Start-up and Results of the Operation, Galveston, US, 08/09 April 2019. SPE 193540. http://dx.doi.org/10.2118/193540-MS.
Sheehan, J., Gjøa Development Opens New Frontier. Society of Petroleum Engineers. http://dx.doi.org/10.2118/0409-0038-JPT.