Boulton H Gas Production

Tullow Oil PLC 15 March 2004 Tullow Oil plc 15th March 2004 Tullow Oil plc Commencement of Production from Boulton H Gas Field Following the successful completion of the Boulton H development well, 44/ 22b-H1x, production commenced on 6th March from this gas field, situated in the UK Southern North Sea. The initial production rate has been measured at nearly 140mmscfd gross. Boulton H is the last field to be brought on production as part of the five field CMS III development programme, which has been developed using the production and transportation facilities of the Caister Murdoch System (CMS), located some 115 miles north east of the Lincolnshire coast. Tullow has a 14.1% unitised equity in CMS III. Production from the five fields, Murdoch K, Hawksley, McAdam, Watt, and now Boulton H, originates from a number of different Carboniferous reservoirs. The current combined production from the fields is 310mmscfd gross. In addition to production from the new well, the additional compressor unit installed as part of the CMS III development programme is fully operational on the Murdoch platform. This doubles the CMS compression capacity and boosts overall CMS production by around 15%. The added compression allows ample provision for handling future developments. Tullow is currently reappraising a number of discoveries in this area using the latest seismic technology. Partners in the CMS III development are: Tullow Oil UK Limited - 14.1% ConocoPhillips (U.K.) Limited (operator) - 59.5% GDF Britain Limited - 26.4% Aidan Heavey, Tullow's CEO stated: 'We congratulate ConocoPhillips on bringing the CMS III project to a successful conclusion. The CMS III project demonstrates the successful application of modern technology to existing discoveries and we look forward to further value-creating initiatives in the area, via both new drilling and third party business.' For Further Information Contact: Tullow Oil plc (+44 20 7333 6800) Aidan Heavey Tom Hickey John Lander Citigate Dewe Rogerson (+44 207 638 9571) Martin Jackson Murray Consultants (+353 1 498 0300) Joe Murray Notes for Editors Tullow Oil plc is one of the leading Independent International Oil & Gas Exploration and Production companies in Europe. Tullow is quoted on the London and Irish stock exchanges (symbol TLW) and is a member of the FTSE 250 Index. Strategy Tullow's strategy is to build strong and secure cash flow from low risk production acreage while applying discretionary funds to exploration territories with high potential. These activities will be undertaken in a manner that reflects a genuine concern for the environment and the health and safety of all personnel. Production and Development Assets Tullow has interests in over 50 exploration and production licences spread over three core areas: UK North Sea, West Africa and South Asia. In the North Sea, Tullow's principal interests are in the CMS (where Monroe exploration well is currently drilling) and the Thames/Hewett group of licences in addition to the operatorship of the Bacton onshore gas-processing terminal. The Espoir field in Cote d'Ivoire, West Africa, is Tullow's principal source of international production. Tullow is also active in exploration and development programmes in Cameroon and Gabon. In South Asia, Tullow has production and exploration interests in Pakistan and exploration activities in India. In Bangladesh, a three well drilling programme in Block 9 is under way. For further information see www.tullowoil.com This information is provided by RNS The company news service from the London Stock Exchange

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