Cladhan appraisal proves successful in the UK North Sea

Source: EnCore Oil

The Cladhan oil discovery in the UK Northern North Sea has been successfully side-tracked on Block 210/29a. 

The Cladhan appraisal well was drilled to a total measured depth of 11,215 feet, as a side-track into the Upper Jurassic channel sands, approximately 3,150 feet to the south of the original 2008 Cladhan discovery. The side-track encountered excellent quality oil bearing sandstones, resulting in a gross hydrocarbon column of 159 feet with 102 feet of net hydrocarbon pay. The sandstone has average porosity of 21 per cent. and average oil saturations of 86 per cent. No oil water contact has been observed. 

Modular Dynamic Test sampling for both formation pressures and oil samples indicate good correlation of both oil type and reservoir pressure with the 2008 discovery well. The original discovery well and this side-track have together confirmed a total hydrocarbon column in excess of 273 feet. 

Drill stem testing will now be performed after which the next phase of the appraisal programme will be to drill a second side-track down dip of the original discovery well in order to confirm the extent of the reservoir and seek to establish the oil water contact.

"This is a superb result from Cladhan and is at the upper end of our expectations regarding the quality and quantity of reservoir sands,” said Alan Booth, Encore’s CEO. “This result supports the idea that Cladhan is a significant stratigraphic trap which has still not encountered an oil water contact. We look forward to the results of the testing and the second side-track in order to help us determine the oil water contact and thus the extent of Cladhan. Only once this information is to hand will we be able to determine the relevant development options of Cladhan and provide an informed estimate of the potential size of the field.

"Aside from this exceptional result at Cladhan, we are hopeful of returning to Catcher this autumn, dependent on the signing of a suitable rig contract which is nearing agreement, but not yet confirmed. The group will target between two and four further locations on the Catcher block which, as with Cladhan, will help determine the size of the overall discovery and future development options. This is a really exciting time for EnCore and we look forward to the results over the coming months."

The equity in the Cladhan joint venture partnership is as follows: EnCore Oil plc (16.6 percent), Sterling Resources (39.9 percent, Operator), Wintershall (33.5 percent) and Dyas (10 percent).

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