The Ebok Field (Ebok) was awarded to Oriental Energy Resources in May 2007 by the ExxonMobil / Nigerian National Petroleum Corporation (NNPC) Joint Venture. The farm-out was structured such that the field benefits from the Nigerian Marginal Field Fiscal and Tax Regime.

Ebok is located in OML 67,50 km offshore in 135 feet of water depth in Nigeria’s prolific south-eastern producing area. The field was discovered in 1968 by the exploratory well (Ebok-1); operated by the ExxonMobil/NNPC JV. Subsequently, 2 appraisal wells were drilled in 1970 (Ebok-2 and Ebok-3).

The Ebok Field (Ebok) was awarded to Oriental A total of 271 feet (83 metres) of net oil pay was encountered in Ebok-1 in four sands between 2,600 and 3,600 feet (800-1,100 metres). Fluid sampling in Ebok-1 well showed average oil gravity of 24°API.

The Ebok Field (Ebok) was awarded to Oriental To date, 35 wells have been drilled (25 oil producers, 1 gas producer, 1 gas injector, and 8 water injectors).

FieldOML 67 Ebok Marginal Field
OperatorOriental Energy Resources Limited
Working interest100%
Gross 2P certified EUR (31/12/15)87.2 mmbbls*
Average production YE 201622,065 bopd
Work ProgramProduction / Dev. / Exploration

Production performance

Production at the Ebok field was 22,000 bopd at year end 2016. During 2017, Oriental Energy successfully drilled two additional production wells in the field, from the Central Fault Block (CFB) platform. In addition, a gas producer was drilled to provide gas for optimizing processes and production in the facility. During the third quarter of 2017 the field production averaged 22,300 bopd, and the field has surpassed 60 million barrels of cumulative production.


Oriental Energy is seeking to maintain production at Ebok field through careful reservoir management, optimization of processes and facilities and the development of new reserves. An effort is underway to identify and plan the drilling of the Ebok Deep prospect, located under the main field reservoirs.


  • From appraisal drilling to First Oil in 20 months
  • Offshore production of heavy oil (14° API)
  • First use of ESPs for artificial lift in offshore wells in Nigeria
  • The largest ESP-based development in offshore Nigeria
  • Use of ICDs for injectors and producers for horizontal wells in offshore Nigeria
  • Use of ESPs with transverse valve allowing back-up gas lift
  • Use of splitter well heads allowing two wells per slot for offshore wells
  • Development drilling with extended reach wells with 2 km offset and 1.2 km vertical depth in offshore Nigeria
  • Drilling of one of the longest extended reach wells in offshore Nigeria by an indigenous operator; with MD of over 10,300 feet
  • One of the first dual zone injectors drilled with horizontal lateral
  • Major OBC Seismic Survey Shot in Offshore Nigeria and Processed in Nigeria by an Indigenous Operator