Well Test Results

Tullow Oil PLC
01 March 2007

News release

Tullow Oil Plc - Kingfisher-1 Well Test Results


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


Calgary, Alberta, March 1, 2007 - Heritage Oil Corporation (TSX: HOC) today
announced final results from the successful testing of all three intervals in
the deeper horizon of the Kingfisher-1A well in Block 3A, Uganda. The three
intervals tested, from between 2,260m to 2,367m, had a total net productive
thickness of 44 metres and produced at a cumulative maximum flow rate of 9,773
bopd. Additionally, the test of the shallower interval reported in November 2006
produced at a rate of 4,120 bopd, resulting in an overall cumulative maximum
flow rate of 13,893 bopd from the Kingfisher well. The tests may be summarised
as follows:

      Depth         Interval thickness    Production      Oil quality    Flowing well head
                                                                              pressure
     (metres)            (metres)           (bopd)           (API)            (psig)
Deeper intervals
      2,344                 21               2,965            32               240
      2,290                 12               2,254            31               157
      2,260                 11               4,554            32               360
                            44               9,773
Shallower interval*
      1,783                 10               4,120            30               221
      Total                 54              13,893



* Test undertaken in November 2006


The oil is good quality light (between 30degrees and 32degrees API) and sweet
with a low gas-oil ratio and some associated wax. All of the above production
flow rates were conducted through a one inch choke. The reservoirs are
sandstones which have high permeability up to 2,300 milliDarcies.



The Kingfisher prospect is a very large structural high that is expressed at
surface on the bed of Lake Albert. Seismic data indicates an areal extent of up
to 70 square kilometres for the Kingfisher prospect. This first exploration well
only investigated a limited part of this large structure and did not reach the
deepest objectives.



Heritage is operator of and holds a 50% interest in Blocks 3A and 1 in Uganda,
and has a 39.5% interest in Blocks 1 and 2 in the Democratic Republic of Congo.
The total gross size of these holdings is in excess of 12,000 square kilometres
and they occupy a very substantial part of the Albert Basin. Heritage's partner
in these blocks is Tullow Oil. A map of the licenses, and the potential targets
in Block 3A, is available on Heritage's website (www.heritageoilcorp.com).



Looking forward to future Uganda work programs, Heritage has contracted to
acquire two seismic surveys this year; a circa 325 square kilometre 3D program
over the Kingfisher and Pelican structures in Block 3A and a circa 500 kilometre
2D survey in Block 1. Further drilling of the Kingfisher prospect will commence
following the acquisition and interpretation of the 3D seismic survey. Efforts
are currently being made to identify and secure a higher capacity rig capable of
deeper drilling in order to explore the deepest objectives not penetrated by the
Kingfisher well. In addition, initial plans are being developed to drill the
offshore Pelican prospect next year.



Tony Buckingham, Heritage's CEO stated 'The cumulative flow rate of 13,893 bopd
from the Kingfisher well has surpassed our expectations. The test results
indicate the outstanding potential of the Kingfisher discovery; substantially
lowers the exploration risk of drilling other multiple targets in our licenses;
and is another step closer to future production and commercial viability.
Heritage is accelerating the work program to maximise the potential of what
could be a world-class petroleum basin. All five wells drilled in the Albert
Basin in the last 15 months have been oil discoveries, which we consider
exceptional for a virgin onshore hydrocarbon basin and Kingfisher is the second
well that has produced over 12,000 bopd under test. This is a very exciting time
for Heritage, as these licenses could transform this Company.'

For further information contact:
Tullow Oil plc                   Citigate Dewe Rogerson      Murray Consultants
([phone])               ([phone])          ([phone])
Aidan Heavey                     Martin Jackson              Joe Murray
Tom Hickey
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 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