Nigeria Block OML 119

Landmark: Twenty-One (21) Week Delivery from Concept to Job Site

Project Overview

• Contract Award: 2001
• Sales: Dunfermline, U.K.
• Fab. Trees: Dunfermline, U.K.
• Fab. Controls: Kongsberg, Norway
• Service Base: Port Harcourt, Nigeria
• Host Type: FPSO
• Contract Type: EPC

Project Characteristics

• No. Trees: 4
• Water Depth: 70 m (230 ft)
• Tree Type: Horizontal
• Tree Pressure: 5,000 psi
• Tree Bore Size: 5"x2"
• Hydrocarbon: Oil

Project Ownership

• ENI 70%
• NPDC 30%

Scope of Work

• Four (4) horizontal 5"x2" 5,000 psi subsea trees
• Four (4) tubing hanger systems
• Four (4) tree caps
• Two (2) rigid mudline conversions
• Running and retrieval tools associated with the mudline conversion
• Subsea tree and tubing hanger running and retrieval tools
• Workover controls system
• System integration testing, installation assistance, service and maintenance

Comments

The ENI Okono and Okpoho Fields, located in Block OML 119 (former Block OPL 91), are 55 km (34 miles) from the Nigerian coast, in water depth ranging from 65 to 75 m (210 to 250 ft). The produced oil is exported through a permanently stationed FPSO, with offloading via a shuttle tanker. The fields can reach a production of 50,000 bopd and a total production of 400 mmbo throughout its life. First oil was achieved in December 2001, a mere 12 months after ENI signed the production-sharing agreement with the NPDC (Nigerian Petroleum Development Company).

The first two (2) systems were shipped 21 weeks from contract award. In order to meet the very ambitious project schedule, ENI requested FMC Technologies to air freight the first two (2) completion systems. A Russian Antinov aircraft was chartered, and equipment delivery was completed in less than 24 hours, compared to the five weeks it normally takes by sea freight.

The first two (2) wells were drilled using non-FMC Technologies wellheads with permanent guide bases. Wells #3 and #4 required a rigid mudline conversion system as the wells had been temporarily abandoned with only 30" of casing protruding from the mudline. For operational reasons, the completions had to be performed from a semi-submersible rig, an operation normally performed by a jack-up rig.