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Carnarvon Petroleum begins drilling Roc South-1 well offshore WA

Roc South-1 is targeting similar structure and hydrocarbons to Dorado.

Noble Tom Prosser jack-up drilling rig
Noble Tom Prosser jack-up drilling rig

Carnarvon Petroleum Ltd (ASX:CVN) has commenced drilling of the Roc South-1 well offshore Western Australia.

Roc South and Dorado reside in WA-437-P in which Carnarvon holds a 20% interest.

READ: Carnarvon Petroleum appraisal confirms major Dorado oil and gas resource, shares up

Since completing operations at the Dorado-2 well, the Noble Tom Prosser jack-up drilling rig has arrived at Roc South-1, about 15 kilometres northeast of Dorado-1 and has drilled the surface hole down to around 195 metres measured depth (MD) in preparation for installation of surface casing.

Forward plan

After installing the surface casing, the rig will drill the 17 1/2” hole to the planned section depth of about 1,200 metres MD followed by setting the 13-3/8” casing.

Well objective

Roc South-1 is an exploration well with primary objectives in the Caley, Baxter, Crespin and Milne Members of the Lower Keraudren Formation.

This well will test the Caley play in a sub-crop trapping geometry that is analogous to the Dorado field, which was discovered in August 2018 and successfully appraised in June 2019.

Caley objective depth structure map

Dorado-1 discovered hydrocarbon bearing reservoirs in the Caley, Baxter, Crespin and Milne Members of the Lower Keraudren Formation.

The Roc South-1 well is located 160 kilometres northeast of Port Hedland in the Bedout Sub-basin.

Map of WA-437-P showing the location of Roc South-1

Well plan

It will take about three weeks to drill and set surface and immediate casing to the point just above the main Caley reservoir.

The main Caley and Baxter Members will then be drilled before running wireline logging to confirm the presence and nature of any hydrocarbons encountered as well as the quality of the reservoirs intersected.  This is expected to take around 8 to 10 days.

The well will then be drilled through to the final total depth of about 5,000 metres, drilling through the final well objectives of the Crespin and Milne Members.

Following the Roc South-1 well, the rig is scheduled to drill the Dorado-3 for further appraisal of the Dorado oil and gas-condensate field.

Quick facts: Carnarvon Petroleum Ltd

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