Well update

Tullow Oil PLC 27 June 2006 News release Tullow Oil Plc - Waraga-1 Well Test Update 23 June 2006 - Hardman Resources, the operator of the Waraga-1 well test in Uganda, in which Tullow Oil Plc (Tullow) is a 50% partner, today issued the following press release. Production Testing Update: Waraga-1 Oil Discovery Hardman confirms that the lowermost zone in Waraga-1 well was successfully perforated at 09:00hrs on 22nd June. The well flowed oil to surface and a stabilised rate has been established sufficient to derive composition, flow characteristics and key reservoir parameters. Initial results show a flow rate of c 1,500 bopd of 33.8 degree API oil through a 36/64' choke. The well is now shut in for pressure build up prior to further flow testing later today. This lower zone will continue to be tested over the next 48 hours. Subsequently, further flow tests will then be conducted on the two other identified hydrocarbon bearing horizons in this well. Testing on all three horizons at Waraga-1 is estimated to take approximately 14 days. Following testing at this well location, the future programme at Mputa will be determined. The next testing programme update is scheduled for Tuesday, 27th June. 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 Martin Jackson Joe Murray Angus McCoss Chris Perry Notes to Editors Tullow is a leading 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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