EnCore Oil Provides Cladhan Appraisal Update

Thursday, May 5, 2011

EnCore Oil plc announces that the Cladhan appraisal well 210/30a-4z located in UK North Sea Block 210/30a has reached Total Measured Depth of 15,900 feet (12,312 feet Total Vertical Depth Sub Sea).

The appraisal well was drilled as a side-track to evaluate the Upper Jurassic sands, approximately 1,000 feet deeper than the 210/30a-4 well. The side-track encountered two separate reservoir intervals with a gross True Vertical Thickness of 12 feet and 169 feet. Although hydrocarbon shows were encountered in both reservoirs, the sandstones have an average porosity of less than 10% and it has not been possible to confirm if the sands are hydrocarbon bearing and in pressure communication with the original Cladhan discovery.

Upon completion of operations at well 210/30a-4z, the Transocean Prospect semi-submersible rig will commence a second side-track well, 210/30a-4y which will drill into the shallower, Central channel to the South. It is expected that this side-track will take approximately 25 to 30 days subject to weather or operational delays.

Commenting on the latest well result, Alan Booth, EnCore's Chief Executive Officer said:
"The principal aim of this aggressive down-dip step out well, some 2,500 feet down-dip from the currently mapped crest of the structure, was to try and obtain three key pieces of information; the location of the oil water contact, either directly or indirectly; an understanding of the nature of any reservoir development in the down-dip 'fan' area of Cladhan; and to better understand if the low net to gross pay in the previous well was related to the specific depositional environment at that location, or if there was also some porosity reduction due to depth.

"I think we can now answer the second two points. There does appear to be an element of porosity degradation related to depth as well as the nature of the depositional environment. The fan area does appear to contain well developed reservoir sequences. However these would appear to have been affected by the depth of burial and at this location, do not constitute effective reservoir.

"The answer to the first point, the oil water contact, is more problematic as no pressure measurements or fluid samples could be obtained from the reservoir. However, oil shows were reported whilst drilling throughout the sequence which suggests there may be oil contained within the tight reservoir. If this is the case, it might suggest that the limit to producible hydrocarbons is potentially related to porosity reduction and that there is in effect no oil water contact. This is a situation that has previously been encountered in this part on the North Sea.

"We now expect to drill two more side-tracks from this well location, one to test the central channel to the south of, and up dip of, the previous well, and then a second side-track location somewhere close to the current rig location. Both these wells will add significantly to our understanding of hydrocarbon distribution in the Cladhan field".

The equity in the Cladhan joint venture partnership is as follows: EnCore Oil plc (16.6 per cent.), Sterling Resources Ltd (39.9 per cent., Operator), Wintershall (UK North Sea) Limited (33.5 per cent.) and Dyas (10 per cent.).


View our North Sea Focus link and stay in touch with the latest news and companies active in this region.

This article is for information and discussion purposes only and does not form a recommendation to invest or otherwise. The value of an investment may fall. The investments referred to in this article may not be suitable for all investors, and if in doubt, an investor should seek advice from a qualified investment adviser. More

Related News

Join 70,000 other oil and gas professionals

Network with others, build your profile, and receive the latest oil and gas news in your inbox. It's free!

Your details are never shared or sold. We hate spam too.

» More Jobs       » Upload a free Job       » Upload your CV

  • Senior Safety & Risk Engineer

    Engineer - Petroleum  |  England, Greater Manchester, Manchester

  • NDT Engineer

    Salary £22.83 - £28.86 per hour   |   Technician  |  England, Devon, Plymouth

  • Labourers with Transport

    Salary £9.00 per hour   |   Trades  |  Scotland, North Lanarkshire

  • QA Manager

    Salary £Neg hourly rate   |   Quality / Inspection  |  Central London

  • Senior Slickline Expert

    Salary €50000 - €90000 per annum, Benefits: accommodation, relocation, furnishing, international schooling, 1 flight home per annum   |   Drilling  |  Vienna, Austria

  • Project Engineering Manager

    Engineer - General  |  England, Surrey

More Europe Jobs

More Global Jobs

Opinion & Commentary

  • Eight pieces of our oil price predicament
    A person might think that oil prices would be fairly stable. Prices would set themselves at a level that would be high enough for the majority of producers, so ...
  • Give us a break...
    I see that Oil & gas UK has been talking again about the need for George Osborne to ‘put his money where his mouth is’ (I paraphrase!) and change the fiscal terms operati ...
  • Why it's different this time
    Is this downturn in oil prices going to be different for investors? I think it might. In fact, I think North American energy companies have a good chance of withstanding th ...

» More Opinion & Commentary         » Write for us             RSS RSS

Oil & Gas Training

Mastering 4D Seismic
Ian Jack, London, 06 Nov 2014

Petroleum Geology of West Africa
Duncan Macgregor, London, 12 Nov 2014

Introduction to Contingency Planning: The value to oil and gas companies in high-risk areas
Mark Theobald, London, 18 Nov 2014

All Upcoming Training


Opinions & Commentary

Oil price, Schlumberger, Petrofac, Lamprell, Pantheon, Aminex and finally...

by Malcolm Graham-Wood

Read More »