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ENI (Agip) Aquila

ENI Aquila


Landmark: World’s first intelligent subsea completion

The Eni (Agip) Aquila field was discovered in 1981 about 73 miles (45 km) off Brindisi in the Otranto Channel in a water depth of 2,790 ft (850 m). The field remained uneconomic until a successful production test of Aquila well #2 convinced ENI that with an innovative approach it could go ahead. Recoverable reserves are put at around 20 mmbo. Peak production, by means of an FPSO, will be 17,000 bopd from two horizontal subsea wells.

The combination of deepwater, remote location, difficult weather conditions and limited recoverable reserves excluded the use of conventional field-development technology. FMC Technologies designed a highly reliable subsea solution that eliminated the need for workovers. The subsea tree configuration includes six annulus lift and downhole penetrations. Four support redundant flat packs contain one electric and one hydraulic line each. An independent hydraulic line was provided for operating the conventional surface controlled subsurface safety valve. A separate chemical injection line for asphaltene antideposition treatment was also provided.

Each well is tied back to a permanently moored floating production, storage and offloading vessel (FPSO) via a 6" production riser, a 2-1/2" gas lift riser and a multiplexed electro-hydraulic control umbilical. The completion system includes a fully integrated data acquisition and control network. The system uses permanent downhole sensors and intelligent completions that are operated remotely through a control network from the surface.

  • Two horizontal 4"x2" 5,000 psi subsea trees
  • Concentric all metal-to-metal sealing tubing hanger
  • Bi-directional sealing wireline plug on tubing hanger
  • All-metal sealing full-bore tree cap
  • Surface-controlled reservoir analysis and management system
  • Stab-in-hingeover flowline and umbilical
  • Production and workover control systems
  • ENI SAF interfaces
  • Electro-hydraulic production control system
  • System integration testing, installation assistance, service and maintenance