Roc-2 appraisal well confirms gas, liquids off W. Australia

The Quadrant Energy Ltd.-operated Roc-2 appraisal well, drilled offshore Western Australia in permit WA-437-P, has recovered condensate-rich gas samples from several zones.

The Quadrant Energy Ltd.-operated Roc-2 appraisal well, drilled offshore Western Australia in permit WA-437-P, has recovered condensate-rich gas samples from several zones.

A full suite of wireline logs has been run resulting in the interpretation of a 30-m net reservoir and 60 m of gross gas and condensate charged sands intersected. There also has been excellent quality reservoir of 100-350 md permeability calculated from downhole sampling rates.

Wireline cores are now being acquired, an operation expected to take a week.

Another 10 days will then be required to install tubes and valving preparatory for flow-testing the well.

Quadrant plans to perforate the well across the uppermost 35-m sand interval and open the valves for a controlled test for about a week. Results of the well test are expected in 3 weeks’ time.

Overall, Roc-2 has now confirmed the presence of a high-quality reservoir within the Calley formation, which is almost fully saturated with gas and condensate. Porosities of up to 15% were observed, the average being about 9%.

Estimated liquid content within the gas is similar to Roc-1 at about 50-60 bbl of condensate per MMcf of gas. Permeability is also similar to Roc-1.

However pressure data obtained from the wireline logs did not correlate with Roc-1 data and it seems that Roc-1 and Roc-2 are likely to be separate structures in all or at least some of the sands. Nevertheless they are all located within the same greater structural closure.

Quadrant has 80% with Carnarvon Petroleum Ltd., also of Perth, with 20%.

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