Well Update

Tullow Oil PLC 08 August 2006 News release Tullow Oil Plc - Mputa Well Test Update 8 August 2006 - Hardman Resources, the operator of the Mputa well test in Uganda, in which Tullow Oil Plc (Tullow) is a 50% partner, today issued the following press release. Uganda: Mputa-1 flow test -Block 2 At 08:00 on 6 August 2006, flow testing commenced on the Mputa-1 discovery well in Block 2. Tests of three intervals are planned at this location. Operations commenced with a speculative test on the fractured granite basement play where hydrocarbons were encountered during drilling. This test recovered only minor amounts of oil, likely due to a restricted and tight fracture system. The two principal tests aim to confirm fluid characteristics and flow potential of oil bearing sand intervals similar to those successfully tested at Waraga-1 in the last quarter. The testing of the first of two sand intervals should commence towards the end of this week. Equities in Block 2 are: Block 2 Hardman Petroleum Africa Pty Ltd (Operator) 50.0% Tullow Oil 50.0% Times and dates for Ugandan wells refer to Uganda time (GMT+3 hours), five hours behind Western Standard Time (Perth, Australis). For further information contact: Tullow Oil plc Citigate Dewe Rogerson Murray Consultants (+44 20 8996 1000) (+44 20 7638 9571) (+353 1 498 0300) Tom Hickey George Cazenove Joe Murray Angus McCoss Notes to Editors Tullow is aleading independent oil & gas, exploration and production group, quoted on the London and Irish Stock Exchanges (symbol: TLW) and is a constituent of the FTSE 250 Index. The Group has interests in approximately 90 exploration and production licences in 15 countries and focuses on three core areas: NW Europe,Africa and South Asia. Tullow's NW Europe interests are primarily focused on gas in the UK Southern North Sea where it has significant interests in the Caister-Murdoch System and the Thames/Hewett areas and operates over 60% of its production. In Africa,Tullow has production and exploration in Gabon, Cote d'Ivoire, Congo (Brazzaville) and Equatorial Guinea and a large gas field development and appraisal programme in Namibia. Tullow also has exploration programmes in Mauritania, Senegal, Cameroon, Uganda, Madagascar and Angola. In South Asia,Tullow has production and exploration interests in Pakistan and Bangladesh and high impact exploration activities in India. For further information please refer to our website at www.tullowoil.com ENDS This information is provided by RNS The company news service from the London Stock Exchange

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