Northern Petroleum Plc
LSE : NOP

June 19, 2009 02:00 ET

Grolloo Gas Field Testing Update

Embargoed for release: 07.00 - 19 June 2009


                                                 
                                      Northern Petroleum Plc
                                                 
                                 Grolloo Gas Field Testing Update
                                                 
Northern  Petroleum  Plc  (the  "Company") announces that in The  Netherlands  it's  wholly  owned
subsidiary  Northern  Petroleum  Nederland  B.V ("NPN")  has  achieved  success  in  hydraulically
fracturing  the main Carboniferous reservoir in the Grolloo gas field.  The field is scheduled  to
be put on-stream in the fourth quarter of this year.

The  subsequent  gas  flow tests which are scheduled to last five days have  been  interrupted  to
install  a  second flare stack for environmental considerations.  This was also the  case  at  the
Brakel Gas field since flow rates in excess of 10 million cubic feet a day tend to emit high  heat
and noise levels as well as the high visible flare making the success obvious to the public.

Quantitative  details  of  the  test results will only be announced  upon  completion  of  current
operations.

NPN is currently undertaking a six field development programme to bring into production proven and
probable  reserves of some 100 million barrels of oil equivalence of which  45.5  million  barrels
are net to Northern.

NPN is currently undertaking the hydraulic fracturing of the reservoirs in five wells scheduled to
be  put  into production in the first phase of development from the existing wells. In the  region
there  has been little application of hydraulic fracturing to enhance production rates other  than
at the Waalwijk gas field which is also under NPN's management.


Derek Musgrove, Managing Director, Northern Petroleum Plc commented:

"This  is our fourth successful hydraulic fracturing operation in the Netherlands. The  previous
three  were  successful  with an outstanding result at Brakel. On this occasion  we  should  allow
ourselves to be optimistic that the operations at Grolloo will achieve comparable results.  So far
the  results have been very encouraging but it is still necessary to await completion of the  full
test  programme  before  formally  accepting that the production  flow  rate  potential  has  been
upgraded. We are looking forward to having the Grolloo gas field in production before the  end  of
the year."

Licence and working interests:
NPN B.V.:                                        45%
Energie Beheer Nederland (EBN):                  40%
Dyas: B.V.                                       15%

In  accordance  with the AIM Rules - Guidance for Mining and Oil & Gas Companies, the  information
contained  in this announcement has been reviewed and signed off by the Exploration and  Technical
Director  of Northern Petroleum Plc., Mr Graham Heard CGeol FGS, who has over 35 years  experience
as a petroleum geologist.


                                            ---ENDS---
                                                 
For further information please contact:

Northern Petroleum Plc                                      Tel: +44 (0) 20 7469 2900
Derek Musgrove, Managing Director
Chris Foss, Finance Director
Graham Heard, Exploration & Technical Director

Jefferies International                                     Tel: +44 (0) 20 7029 8000
Chris Snoxall / Schuyler Evans                                                                  

Blue Oar                                                    Tel: +44 (0) 20 7448 4400
Jerry Keen / Toby Gibbs

Bishopsgate Communications (Press)                          Tel: +44 (0) 20 7562 3350
Nick Rome / Michael Kinirons

Buchanan Communications (Analysts)                          Tel: +44 (0) 20 7466 5000
Tim Thompson / Ben Romney


Notes to Editors:

Following completion of the acquisition of ATI Oil Plc., Northern Petroleum Plc ("Northern")  will
have  recoverable Proven and Probable reserves of 103 million barrels of oil equivalence.   It  is
currently producing gas at Waalwijk and the offshore P12 fields.

The  planned  development  of  six  onshore oil and gas fields is  being  progressed  through  the
Netherlands authorisation and planning processes.  Dyas B.V. and  EBN, the Netherland's state  oil
and NAM.

Northern  recently  sold its interest in the Waalwijk Underground Gas Storage project  application
for an overall consideration of £10 million.

Northern  manages  the largest licensed exploration area in Italy, over 14,000 km²,  predominantly
offshore  but  includes seven licences in the Po Valley oil and gas province in the north  of  the
country. Through its holdings in licences in the southern Adriatic covering the Rovesti and  Giove
oil  discoveries  it has net Probable oil reserves independently assessed at 53.2 million  barrels
recoverable.  In  2008  a deal was signed with Shell Italia refunding Northern's  past  costs  and
providing for Shell Italia to fund the next phases of exploration of a potential new oil  province
in the extension of the Apennine thrust system offshore Sicily.

In  the UK the Group is also a significant holder of licences in the south of England where it has
a 10% interest in the production from the Horndean oil field and a 5% interest in the Avington oil
field. It also has planning consents to drill an eastward extension of the Horndean oil field  and
an exploration well at Havant.  Northern has a 50% interest in these ventures.

For  further  information  on  the  Group  and its activities  please  refer  to  the  website  at
www.northpet.com.



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