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Tullow’s Ngiri-2 Appraisal Well Success

Source: www.gulfoilandgas.com 7/28/2010, Location: Africa

Tullow Oil plc (Tullow) announces that the Ngiri-2 appraisal well, which is located in the Butiaba region of Uganda Block 1, has encountered over 40 metres of net oil bearing reservoir in two zones within an overall 131 metre gross oil bearing interval.

The well was drilled 1.7 km north of the Ngiri-1 discovery well (drilled on the Warthog prospect) to a total depth of 892 metres. Successful logging and sampling operations have confirmed the presence of moveable oil in two zones. The lower zone encountered an oil water contact while pressure data acquired within the upper zone indicates the possibility of a deeper contact than expected. Reservoir quality is also excellent, akin to the Kasamene field in Block 2, where a production rate of 3,500 bopd was achieved during testing in 2009.

The Ngiri-2 well was the first of a multi-well appraisal programme planned to further evaluate the extent and recovery potential of the Ngiri field. Further activities will take place in 4Q 2010 with the drilling of down-dip appraisal wells Ngiri-3 and Ngiri-4 designed to establish oil water contacts and reservoir distribution.

The well has been suspended and the IRR-600 rig is moving to the Mpyo-1 location where material wildcat drilling operations will commence.

Tullow operates its 100% interests in three licences, Blocks 1, 2 and 3A, in the Lake Albert Rift Basin in Uganda.

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