Well Test Update

Tullow Oil PLC
10 July 2006

News release


Tullow Oil Plc - Waraga-1 Well Test Update


10 July 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, Uganda


Hardman has completed testing of the third and final interval of the three
hydrocarbon bearing zones at the Waraga-1 location. Following a shut-in period
for pressure build-up, the uppermost zone (1680 to 1710 metres) produced a
maximum stabilised flow rate of c. 3,650 barrels of oil per day (bopd) of 18.6
degrees API oil through a 1' choke. This follows the company's previous update
that reported the same zone flowed at a stabilised rate of c. 2,100 bopd through
a 36/64' choke.



This concludes the testing programme at Waraga-1, designed to assess formation
productivity and acquire good quality fluid samples. The well has been plugged
and suspended ready for completion and potential future production.



Results from the three zones tested are summarised below:


       Test           Perforated Interval        Main test       Maximum flow (1'     Oil quality
                             Depth                                    choke)
                                               (36/64' choke)

#1. Lower Zone      1,888-1,894 metres       1,500 bopd           4,200 bopd       33.8degrees API
#2. Middle Zone     1,782 to 1,792.5 metres  2,400 bopd           4,200 bopd       33.8degrees API
#3. Upper Zone      1,680 to 1,710 metres    2,100 bopd           3,650 bopd       18.6degrees API
                                       TOTAL 6,000 bopd         12,050 bopd



The rig and testing equipment will now be relocated to the Mputa-1 location for
flow testing of similar oil bearing intervals to those tested at Waraga. In
addition a flow test will be attempted from fractured basement lithologies where
hydrocarbons were encountered during the drilling of the Mputa well - an
additional play type to those already tested at Waraga. The programme at Mputa
is expected to commence in early August.



Hardman's next drilling update will be in mid July 2006 with the spudding of the
Colin-1 well, located in PSC Area 'A', offshore Mauritania.



For further information contact:


Tullow Oil plc              Citigate Dewe Rogerson           Murray Consultants
([phone])          ([phone])               ([phone])
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




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