Project Profile
Location: Nam Con Son basin, offshore Vietnam
Value: US$405 million
Start-up Year: October 2011(Chim Sao) and July 2014 (Dua oil field)
Water Depth: 95m
Average daily production: ~27,000 barrels of oil and 25 mmcf of associated gas (2017)
Oil Reserves: 50 million bbl
Discovered in 2006, Chim Sao, formerly Blackbird, is located on Block 12W and 12E in 377 feet (115 metres) of water, around 248 miles (400 kilometres) southeast of Ho Chi Minh City, offshore Vietnam. Dua oil field is a subsea tie-back to Chim Sáo, which was brought on-stream in 2014.
Exploration:
The Chim Sao discovery well, (12E-CS-1X), found four oil bearing intervals in the main Middle Dua target, intersecting more than 230 feet (70 metres) of net pay. Two years later, the partners further appraised the field and successfully drilled the Chim Sao North appraisal well. The well was drill stem tested and flowed oil at a sustained rate of 1,650 bopd and 1.4MMcf/d (.04 MMcm/d) on a 40/64-inch choke. The second production test flowed at a rate of 2,680 bopd and 2.1MMcf/d (.06 MMcm/d) on a 48/64-inch choke.
This result led to the well being sidetracked down-dip to delineate the oil/water contact and the extent of the hydrocarbon-bearing reservoir. The Chim Sao North well, suspended as a future producer, was appraised to optimize the field's development plan.
Field Development:
once Chim Sao was appraised, a field development plan was submitted to authorities and received government approval in April 2008. The first phase of the field development plan includes two wellhead platforms tied-back to the Nexus 1 FPSO. The FPSO will have the capacity to process up to 25-30,000 bopd, then offload oil to shuttle tankers. Gas will be exported via a spur and then through PetroVietnam's Nam Con Son gas pipeline.
BW Offshore submitted a bid to provide both the provision of the FPSO and for an EPCI contract for the surface facilities. On March 28, 2009, BW Offshore reported it is working on a private placement for the Nexus 1 FPSO. The lease agreement and the EPCI contract are dependent on BW securing funding for the vessel.
The partners have contracted the Wilboss jackup, for a three to four well exploration campaign in the first half of 2009 to further appraise the area and to see if there are additional oil discoveries that can be tied-back to the Chim Sao development.
Operators:
Premier Oil Vietnam Offshore BV: Operator and 53.125% interest
Ophir Energy: 31.875% interest
PetroVietnam (PVEP): 15% interest
Contractors:
Emas Offshore Pte Ltd: FPSO Contract
Ensco International: Jack-up drilling rig
EOC Limited: Project management, engineering and procurement services for modifications
Genesis Oil & Gas Consultants: FEED contract
MODEC: FEED for FPSO contract
Constituent companies:
Petroleum Technical Services Company (PTSC) (PTCS Marine also contracted for supply vessels, Vietsovpetro and Saipem: EPC - Fixed facilities
Subcontractors:
Dynamic Processing Solutions (DPS): Subcontracted by EMAS for process topsides engineering contract
EMAS AMC: Subcontracted by PTSC for transportation and installation of facilities for the Dua subsea field
Keppel Shipyard: Subcontracted by EMAS for FPSO conversion