Last updated: 30 Jul 2014
The Tweneboa-Enyenra-Ntomme (TEN) fields are located in the Deepwater Tano licence which covers an area of more than 800 sq km, and lies around 20km west of Tullow’s Jubilee field.
The first discovery was made by the Eirik Raude drill rig in March 2009. Drilling in Turonian turbidite sands, in water depths of more than 1,100 metres, the team discovered a gas condensate reservoir, named Tweneboa 1. The next find at Tweneboa was made in January 2010, 6km to the southeast and again in Turonian aged sands. In more than 1,300 metres of water the Atwood Hunter rig discovered an oil reservoir and two separate gas condensate reservoirs. In December of the same year, the Deepwater Millennium discovered two more condensate pools.
The first find at the Enyenra field was made by the Sedco 702 in July 2010. Working in more than 1,400 metres of water, the rig drilled the well, Owo-1, to a total depth of 3,890m. In two zones of stacked Turonian aged sands it discovered good quality light oil, between 33 and 36 degrees API. The sidetrack well discovered an extension of the same light oil reservoir and two separate gas condensate reservoirs.
In the last two months of 2010, working in 1,600 metres of water 6km southeast of Tweneboa 2, the Deepwater Millennium discovered the Ntomme gas-condensate field.
During 2011 and 2012, significant progress was made in the programme of appraisal drilling and flow testing of the TEN fields which lead to the submission of the Plan of Development to the Minister of Energy in early November 2012 and was approved in May 2013 with first oil on track for mid-2016.