In 2016, the Subsea Integration Alliance (SIA) was awarded the industry’s first deepwater integrated subsea engineering, procurement, construction, installation, and commissioning multiphase boosting-system contract. The scope of the contract called for the supply and installation of a subsea multiphase boosting system in the Dalmatian field in the Gulf of Mexico (GOM). This paper explains the application of the system in the field, and an approach to project delivery using fit-for-purpose solutions that ensured seamless delivery and installation for the operator.
Dalmatian Area Development
An exploration and production company has expanded the Dalmatian field to include a subsea boosting system at Well DC4 for enhanced oil recovery. The phased development project is in Viosca Knoll 786A and is tied back to a platform.
Phase 1, completed in 2014, included a 35-km oil-well tieback (DC4-1) and a 39-km gas-well tieback (DC48).
Phase 2, completed in 2015, included an 18-km extension to the initial 35-km flowline and catered for the addition of two wells (DC134-1 and DC134-2) and future potential for expansion.
Phase 3 included the subsea boosting system and was successfully installed and put into operation in October 2018 (image above).
Dalmatian Boosting System
The Dalmatian project is a brownfield development, extending the plateau production and increasing total recovery using subsea multiphase boosting. The project represents the world’s longest multiphase tieback by boosting at some 35 km; the boosting system is installed at approximately 6,000 ft water depth.
