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Hook Head now confirmed as a significant oil discovery

10 October 2007

The Hook head well is now being suspended after good quality oil has been recovered from the target reservoir zones. The Hook Head partners have committed to an immediate and detailed evaluation of the well results in the context of operations as well as reservoir data with a view to further appraisal/ development drilling at Hook Head early in the 2008 drilling season.

SOSINA Exploration Ltd., together with the operator Providence Resources Ltd. and its other partners has now ended its well testing operations on the 50/11-3 Hook Head appraisal well, offshore Ireland. This well, which is located in c. 240 ft. water depth and is c. 60 km offshore southern Ireland, is situated in Standard Exploration Licence 2/07 in the North Celtic Sea Basin.

The license interest is jointly held by six companies and is operated by Providence Resources, which has an interest of approximately 43.5% (see below). The well was drilled to a total depth (TD) of 4,880 ft. true vertical depth subsea (TVDSS) using the semi-submersible drilling rig Petrolia, which Providence and its partners had contracted for a 50-day period.

Some of the key results determined from the drilling programme and the preliminary evaluation of the well data are:

  • The well was drilled on the crest of the structure and was on geological prognosis confirming the pre-drill interpretation.
  • Hydrocarbons were encountered over a 484 ft. gross interval in the main target zone with 75 ft. of net hydrocarbon bearing section.
  • Three further prospective zones, which were identified pre-drill as exploration targets for the well, were all logged as being hydrocarbon-bearing. These good quality reservoir zones, which are above the main target zone, had good oil/gas shows whilst drilling and logged a cumulative of c. 20 ft. of additional net pay.
  • The hydrocarbon type recovered is now confirmed as a good quality (c. 30o API) crude oil, with associated gas.
  • The reservoir is normally pressured to c. 1,170 psi at c. 2,550 ft. TVDSS.
  • The reservoir porosities within the hydrocarbon bearing zones are up to 27%.

Whilst key reservoir and fluid data were acquired during the initial well flowing period, down-hole mechanical conditions*, which were primarily related to the integrity of the casing string cement bond, delayed the implementation of a full flow test programme. Further work on the down-hole mechanical conditions was precluded by the time limitations relating to the rig contract.

Accordingly, the partners have now moved to suspend the well for future re-entry and potential use as a production well, having gathered all data that can be reasonably acquired at this time. The rig is currently being demobilized.

The Hook Head partners have committed to an immediate and detailed evaluation of the well results in the context of operations as well as reservoir data with a view to further appraisal/ development drilling at Hook Head early in the 2008 drilling season. Discussions have already commenced regarding the securing of an appropriate rig.

*A lack of good casing cement bond resulted in poor casing integrity, which resulted in water ingress from zones above and below the main hydrocarbon-bearing intervals. Several sequential remedial cement jobs were carried out which hampered the ability to carry out a full testing programme within the timeframe available. However, this remedial work has secured the well for potential future re-use.

Offshore worker looks on as the 50/11-3 Hook Head appraisal well flows to surface during initial well testing operations

(Courtesy by Providence Resources Ltd)

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Hook Head well flare


David J. Davies

Managing Director

SOSINA Exploration Ltd

Mob: +44 (0)7703 293 649

Golden Cross House

8 Duncannon Str

London WC2N 4JF

Tel: +44 (0)207484 5071

Fax +44 (0)20 7884 5100

1 Berry St


AB25 1HF

Tel: +44 1224 845464

About Hook Head

The Hook Head structure is a large mid-basinal anticline where two previous wells have encountered hydrocarbon bearing sands. The original IRL50/11-1 discovery well was drilled by Marathon in 1971. A subsequent IRL50/11-2 appraisal well was drilled by Marathon in 1975 as delineation well at the down-dip edge of the structure. Post-drill mapping by Marathon indicated that the crest of the structure was located to the north-east of the IRL50/11-1 discovery well, which was further supported by the seismic data acquired by Providence in 2006 and is now substantiated by the this IRL50/11-3 appraisal well.. This crestal location is some 2 km northeast of the IRL50/11-1 well and is c. 70 metres structurally higher than the original well. Pre-drill, in-house, volumetric estimates suggested that the Hook Head discovery has a STOIIP figure of up to 391 MMBO over 3 panels, containing prospective resources of up to 70 MMBO REC.

Celtic Sea Licence 2/07

Licence No 2/07 refers to part blocks 49/22, 49/23, 48/29, 48/30, 49/26, 49/27, 49/28, 49/8, 49/9, 49/13, 49/14, 50/6, 50/7 and 50/11 in the North Celtic Sea Basin. Standard Exploration Licence 2/07 partners include, Providence Resources Plc (Operator) 43.5294%, Challenger Minerals (Celtic Sea) Limited 16.3235%, Dyas BV 16.3235%, Forest Gate Resources Inc. 7.5%, Atlantic Petroleum (Ireland) Limited 10.8824%, SOSINA Exploration Limited* 5.4412%.

* Farm in subject to Ministerial Consent

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