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CASE STUDY : Oso Offshore Oil Field, Nigeria

About Oso Offshore Oil Field

In Nigeria, the ExxonMobil major operates under the name of Mobil Producing Nigeria Unlimited (MPN). MPN operates more than 25 offshore fields in the Gulf of Guinea, including discoveries yet to be developed.

Mobil came to Nigeria after independence in the early 1960s and took up several E&P licences offshore. Its first main oil discoveries in 1966 were six fields: Ekpe, Asabo, Eku, Idoho, Inim and Utue. They were all developed and put into production two to three years later. In 1967 it found the Adua oilfield, which it developed, and the Oso gas/condensate field which it decided not to develop at the time because the incentives were not adequate. Oil discoveries were made in the subsequent decades and MPN developed most of them to replace older fields which were depleting.

The Oso Field: It was not until 1988 that MPN decided to develop Oso, on the basis of a 1986 MoU guaranteeing a minimum profit margin of $2/b and confirmation that condensates were excluded from OPEC's production quotas. The World Bank and its IFC funded the Oso JV. About 89 km south-west of MPN's Qua Iboe terminal and 67 km from the Bonny island gas processing system, Oso is a giant gas field by African standards producing 95,000 b/d with a sustainable capacity of 100,000 b/d. Oso has had enough reserves to recover at least 500m barrels of condensate in a 20-year production period and to still have a deposit of about 3,500 BCF. From the remaining gas, MPN can recover liquids, including butane and propane. As the gas is forced to the surface, it cools and takes the form of condensate, having the qualities of a very light, almost sulphur-free oil. Gas associated with condensates is then re-injected into Oso for an important NGL recovery system, Phase-II, which came on stream in November 1998.


(1) Oso offshore oil field.
(2) Oso offshore oil field.
(3) Parts of the Cardox System being explained.
(4) Plant personnels undergo training of the Cardox System.
(5) Charging the Cardox tube.
(6) Cardox tube ignition sequence being explained to the trainees.
  (7) The graduates from the Cardox training onboard the Oso offshore oil field.  
(8) Bryan and the boys of Oso offshore oil field.


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The SiloWhip System is the MOST POWERFUL silo whip in the world. Although it is purposely build to take on the hardened build-up commonly found in cement and clinker silos, it is GENTLE enough to clean out other materials.

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