Subsea Asset Life Extension in Harsh Environments
- Benjamin Robert Coupland (OneSubsea) | Mike Avery (OneSubsea) | Robert Greenaway (OneSubsea) | Phillip Adam Rice (OneSubsea) | Douglas Weir (BP North Sea)
- Document ID
- Offshore Technology Conference
- Offshore Technology Conference, 4-7 May, Houston, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2020. Offshore Technology Conference
- 4 Facilities Design, Construction and Operation, 5.4 Improved and Enhanced Recovery, 3 Production and Well Operations, 7.3.3 Project Management, 5 Reservoir Desciption & Dynamics, 3 Production and Well Operations, 4.1 Processing Systems and Design, 7.1 Asset and Portfolio Management, 6.3 Safety, 4.1.2 Separation and Treating, 7 Management and Information, 2.1.3 Completion Equipment, 7.1.8 Asset Integrity
- Production Enhancement, Intervention, Modular Solutions, Retrofit Processing, Asset Life
- 70 in the last 30 days
- 70 since 2007
- Show more detail
- View rights & permissions
West of Shetland, BP North Sea discovered they had a problem with subsea tree mounted pressure and temperature sensors that whilst dual redundant, still completely failed over time. The measurements are required by the local regulatory body to comply with monitoring of asset integrity and as such once failed the subsea trees were forced to be shut in. Reinstating this production-critical monitoring equipment significantly reduces downtime and deferred production. Later in the life of the field the same damage mechanism that contributed to erosion and fouling of tree mounted sensors had also begun to reduce injectivity within the subsea injection wells and eroded the subsea insert retrievable chokes installed on those trees. BP North Sea initially planned for a campaign of choke insert replacements but later realized the ideal opportunity to incorporate stimulation treatments during the same intervention campaign
The original retrofit package restored an injection well at a cost saving of 70% compared to conventional solutions. However, continued development led to a next generation retrofit package which allowed streamlined configurability to suit a range of choke types across the BP's subsea infrastructure. This enabled life extension whilst introducing enhanced functionality, all whilst optimizing inventory and minimizing capital investment. In parallel, well stimulation operations on 4 water injection wells yielded injectivity improvements of up to 300%, compelling BP to continue to plan further stimulations for future wells. This scenario led to the next generation of retrofit packages including an additional feature of a dedicated hydraulic access point. The access allowing more efficient stimulation operations and providing significant cost saving in terms of vessel time and in-field operations.
The paper discusses the benefits of combining production enhancement technologies and well status monitoring sensors to enable significant improvements in field recovery. Production improvement metrics and lessons learned shall be shared to provide a robust economic justification.
Operational lessons learned from these various activities show how modularity and product streamlining can significantly reduce operating expenditure, time in field, and overall safety of a product.
Collaboration with invested parties can offer additional sources for product improvement which further contributes to product optimization and successful project execution.
|File Size||1 MB||Number of Pages||14|
Avery, M., Large, R., Azhar, H.. 2019. Asia’s First Rigless Subsea Stimulation Using Patented Well Access Technology and a Fully Integrated Service Model. Presented at the SPE Subsea Well Intervention Symposium, Galveston, Texas, USA, 13-15 August. SPE-197073-MS. http://dx.doi.org/10.2118/197073-MS.
Gosden, E. 2017. BP strikes old oil boost for North Sea. The Times, 23 May 2017, https://www.thetimes.co.uk/article/bp-strikes-old-oil-in-boost-for-north-sea-883vgpks8 (accessed 29 January 2020).