Kingfisher Well Update

Tullow Oil PLC
16 February 2007

Tullow Oil plc - Kingfisher Well Update - Uganda




16 February 2007 - Heritage Oil, the operator of the Kingfisher-1 exploration
well in Uganda, in which Tullow Oil plc ('Tullow') is a 50% partner, yesterday
evening issued the following press release:



  HERITAGE OIL TO PRODUCTION TEST DEEPER HORIZONS IN KINGFISHER WELL IN UGANDA



Calgary, Alberta, February 15, 2007 - Heritage Oil Corporation (TSX: HOC) today
announced that it is preparing to production test deeper intervals in the
Kingfisher-1A deviated exploration well in Block 3A, Uganda. The Company is
planning to test three intervals with a total thickness of 44 metres between
2,260 and 2,367 metres.



A shallower interval, at a depth of 1,783 metres, was tested successfully in the
Kingfisher-1 well in November 2006, producing 4,120 bopd over a 10 metre
interval. The tested oil was light (c. 30degrees API) and sweet with a low
gas-oil ratio and some associated wax. Flow data from the test indicated the
reservoir had an extremely high permeability of over 2,000 milliDarcies.



Kingfisher-1A was drilled to a total depth of 3,195 metres, which was determined
to be close to the limit of the rig's operational capability. Wire-line logs and
formation pressure testing have evidenced encouraging indications of
hydrocarbons over the planned test intervals, the thickest of which is 21
metres.



Heritage currently anticipates that it will commence testing within 10 days. The
test program is scheduled to take up to three weeks. Test equipment has remained
at the wellsite following the initial successful test of the Kingfisher-1 well.



Further details about Heritage's exploration activities in Uganda, including
acquiring a 3D seismic survey and further appraisal drilling to evaluate the
deepest potential of the basin will be announced when the results of the test
program are available.



Heritage is the Operator of Block 3A in Uganda with a 50% equity interest in the
license, with Tullow Oil holding the remaining 50% interest.



For further information contact:

Tullow Oil plc                     Citigate Dewe Rogerson              Murray Consultants
([phone])                 ([phone])                  ([phone])
                                   Martin Jackson                      Joe Murray
Chris Perry
Angus McCoss





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 over 100
exploration and production licences across over 20 countries and focuses on
three principal 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 exploration and production in Gabon, Cote d'Ivoire, Congo
(Brazzaville), Mauritania and Equatorial Guinea and a large gas field
development and appraisal programme in Namibia. Tullow also has exploration
programmes in Mauritania, Senegal, Cameroon, Uganda, Congo (DRC),Tanzania,
Madagascar, Angola and Ghana.



In South Asia, Tullow has exploration and production in Pakistan and Bangladesh
and high impact exploration activities in India.



Following the recently completed acquisition of Hardman Resources Limited,
Tullow also has high impact exploration interests in French Guiana, Suriname and
the Falkland Islands.

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