Murphy Oil contract will see the Alliance partnership design and install the industry’s longest subsea multiphase boosting tieback
Despite tough times – in many cases because of them – subsea developments are still pushing the innovative envelope. While more and more facilities are planned as tiebacks, operating capabilities continue to be extended, be it for compression at Norway’s Asgard, or depth and pressure tolerance at the Julia field in the Gulf of Mexico. Meanwhile, business models such as that of the Subsea Integration Alliance have also come into their own. Earlier in December, the partnership – a joint enterprise between OneSubsea, Schlumberger and Subsea 7 formed in 2015 – announced that it had been awarded the industry’s first deepwater integrated subsea engineering, procurement, construction, installation and commissioning (EPCIC) contract for a multiphase boosting system. The firms will work to design, build and install the system for Murphy Exploration & Production Company USA – a subsidiary of Murphy Oil – at its Dalmatian field in the Gulf of Mexico. At 35km, the project is pegged to be the industry's longest deepwater subsea multiphase boosting tieback. The contract includes topside and subsea controls, as well as an integrated power and control umbilical along its length. The Dalmatian field lies across De Soto Canyon Blocks 4, 48 and 134, in water depths of between 5,900 feet (1,800 m) in the North Field and 6,400 feet (1,950 m) in the South. It produces oil, gas and NGLs and is currently tied back to the Petronius compliant tower operated by Chevron and Marathon Oil.
Installation is scheduled to begin in 2018. In a statement, OneSubsea and Schlumberger president Mike Garding said: “This subsea boosting technology will improve Murphy E&P's ultimate recovery through a cost-effective, record tieback. The innovative business model of the alliance further contributes to greater certainty of cost and return on investment.” Subsea 7's chief executive officer, Jean Cahuzac, added: “This contract recognises our successful alliance model that brings together Subsea 7's SURF technology and extensive track record in the delivery of large-scale complex EPCIC projects, with OneSubsea's reservoir and subsea production and processing systems technologies. Our alliance presents Murphy E&P with many opportunities to improve their field economics, and reduces complexity, cost and risk to achieve production objectives safely, on time and within challenging cost targets.” The value of the contract has not yet been released. InnovOil has reached out to Schlumberger for more information.
Records on a roll The project has already achieved some notable records. In 2014, Subsea 7 was awarded the contract for the Dalmatian South flowline. At 1,950m, it is the deepest reeled pipe-in-pipe installed by the company to date. The pipe-in-pipe flowline system itself was comprised of 10-inch x 18.3mm WT X65 outer sleeve pipe and 6-inch x 15.9mm X70 inner pipe, with associated water stops, centralisers, buckle arrestors and bulkhead connections. Pipe welding, including procedure qualification, was executed using Subsea 7’s automatic welding system. The project was completed in December 2015.
Contact: Susan Ganz - Schlumberger Email: Sganz1@slb.com Web: www.slb.com