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Empire hits Red Gully gas and condensate

By  AOG Staff Tuesday, 19 April 2016 03:43
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Australian onshore conventional gas and condensate producer Empire Oil and Gas’s 100% owned Red Gully North-1 discovery confirmed moveable gas and condensate. 

Empire said the well was perforated over three test intervals within the Cattamarra C and D sands. Testing operations commenced over the Cattamarra C interval, and some 490 bbl of fluid were recovered before the well began to flow naturally.

The well then flowed 0.067 MMcf of gas and 15 bbl of condensate, and 895 bbl of water were recovered during a flow period of 19.5 hours. The gas and condensate flow rates prior to shut-in were 0.13 MMcf/d and 18 b/d respectively. The final water rate was 1090 b/d of water.

Following the completion of the C sand test, a separate test of the upper zone of the Cattamarra D sand was conducted, the firm said. A flow period of 26.5 hours was undertaken prior to shutting-in the well for a 48 hour build up to obtain down hole pressure data. During the flow period the well was nitrogen lifted and flowed gas at an increasing rate.

The rate prior to shut-in was 0.392 MMcf/d with an approximate condensate rate of 121 bbl/d. The gas flow was accompanied by significant water production, which reached a maximum of 2300 bbl/d prior to shutting in the well.

Water production is interpreted to be due to a poor cement bond over the Cattamarra C and Upper D intervals as evidenced by the cement bond log. During the drilling of the Cattamarra sands, shale was produced to surface resulting in large washed out hole sections, which has compromised the cement integrity.

It is possible that the tests of the upper two zones are invalid, given potential communication with water bearing reservoirs just above the Cattamarra Upper C interval. The high water flows from the upper two test zones are unusual given the interpreted low permeability of the sandstone intervals, which were tested.

Empire said further analysis will be required to understand the validity of these tests once all water, gas and condensate samples have been analyzed and pressure gauge data has been collected.

The well is currently shut-in to obtain downhole pressure from the Upper D sand interval prior to undertaking the test of the Lower D sand later this week. The cement bond log indicates that the cement bond over the Lower D zone is good and zonal isolation is more likely to be achieved.

Image: Red Gully plant / Empire 

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