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Antelope: appraisal drilling update

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Oilfield Technology,

InterOil Corp. has provided an update on the appraisal drilling on the Antelope field in Petroleum Retention License 15 (PRL15) in the Gulf Province of Papua New Guinea.


The second extended well test on Antelope-5 has been completed - it flowed at an average of 53.3 million ft3/d. The majority of the stabilised flow occurred on a 48/64 in. choke at a rate of approximately 57 million ft3/d.

Downhole pressure gauges have been successfully retrieved from both Antelope-5 and Antelope-1 (observation well) and data has been extracted for analysis.

Preliminary analysis has confirmed the excellent reservoir quality and connectivity seen in the initial Antelope-5 production test conducted in mid-2015.


9-5/8 in. liner was run to the top reservoir, four cores were cut from the upper section of the reservoir and intermediate logs were run.

The four cores were cut over an interval of 2268 to 2330 m measured depth from rotary table (MDRT) and the well reached a depth within the reservoir section of 2330 m (MDRT). Preliminary interpretation shows approximately 12 m of dolomite is present in the drilled section.

It was decided to conduct an intermediate, multi-rate flow test over an interval from 2264 to 2330 m MDRT in the target interval. A final stabilised flow rate of approximately 13 million ft3/d was obtained over a 24 hour period, measured through a 40/64 in. choke. The well is currently shut-in for pressure build-up.

Once testing is complete it is planned to drill through the gas-water-contact to a proposed total depth of approximately 2650 m MDRT and then run a full suite of wireline logs.

The Antelope-6 appraisal well is located 2km east-south-east of the Antelope-3 well.

Edited from press release by

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