Northern Petroleum Plc

May 06, 2009 02:00 ET

Nieuwendijk Well Sets European Record - Casing While Drilling

                                                                                           06 May 2009
                                        Northern Petroleum Plc
                                      ("Northern" or "the Group")
                                 NIEUWENDIJK WELL SETS EUROPEAN RECORD
Casing While Drilling (CWD)

Northern's  wholly  owned subsidiary: Northern Petroleum Nederland B.V. (NPN)  has  successfully  used
Casing While Drilling (CWD) technology for the first 780m (2,567 ft) section of the Nieuwendijk  well.
CWD  is  an  innovative technology used for simultaneously drilling and casing  a  well.  The  process
enabled  a  safer  and speedier operation to reach to target depth by eliminating  conventional  drill
string tripping and associated risks. A Hughes Christensen drillable 12-1/4" EZCase bit was used. This
is the longest CWD run with this system in the Eastern Hemisphere.

NPN has utilised casing drilling technology on the automated drilling rig (LOC 400). The rig was newly
fabricated  by Northern Dutch Drilling Company (NDDC) and the CWD run was the first well for  the  rig
and crew since manufacture.

The Hughes Christensen EZCase bit drilled the 780m from surface in 71 hours with a Rate of Penetration
(ROP)  of  11 m/hr (36 ft/hr) using controlled drilling. The casing was successfully cemented  through
the  bit with no difficulty. The EZCase bit was then drilled-out through its centre in 1.5 hours using
a specially designed 8-1/2" Polycrystalline Diamond Compact (PDC) bit. This bit has enabled both drill-
out of the casing bit and continuous drilling ahead for the intermediate section of the hole.

The well is currently conventionally drilling ahead towards its reservoir objective.

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,  Mr Graham Heard CGeol FGS, who has over 35 years experience  as  a  petroleum

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

Investec                                                 Tel: +44 (0) 20 7597 5000
Michael Ansell / Patrick Robb

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

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

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

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