PRELIMINARY analysis of a second extended well test carried out at the Total-operated Antelope 5 well on the Elk-Antelope field has confirmed the excellent reservoir quality and connectivity seen in production testing.
Located on petroleum retention licence 15 in the Gulf province of Papua New Guinea, the Antelope 5 well flowed at an average of 53.3 million standard cubic feet gas per day (MMcfd) measured through a 48/64 inch choke for 14 days and then shut-in for over 14 days to record the subsequent pressure build-up.
Total’s project partner InterOil Corporation said the extended well test matched results from the initial Antelope 5 production test conducted in mid-2015.
“The forward plan is to undertake further analysis to quantify nearby reservoir properties,” InterOil said in its announcement.
The majority of the stabilised flow occurred on a 48/64 inch choke at a rate of approximately 57 MMcfd.
“In order to improve the certainty of the minimum connected volume, we have added additional pressure gauges and we plan to flow five times more gas than we did in our initial test last year,” he said.
The news came as a 9.625 inch liner was cut into the top reservoir of the Antelope 6 well, with four cores cut from the upper section on the reservoir and intermediate logs run.
Preliminary interpretation from the cores shows about 12 metres of dolomite was present in the drilled section, InterOil said.
A final stabilised flow rate of 13 MMcfd was obtained after an intermediate, multi-rate flow test was conducted between 2,264 metres and 2,330 metres in the target interval.
Total would run wireline logs after drilling through the gas-water-contact of a proposed total depth of 2,650 metres.
Total is operator of PRL 15 with a 40.1 per cent stake. InterOil holds 36.5%, Oil Search 22.8% and minor stakeholders hold 0.5%.
In a statement released alongside its fourth quarter 2015 results, Oil Search managing director Peter Botten said completion of the appraisal program may include a further appraisal well, Antelope 7.
“[This] will enable the selection of the final development concept and confirmation of whether the resource can support one or two trains,” he wrote.
“In parallel, a comprehensive work program including environmental and societal studies, surveys, subsurface and engineering studies, as well as work on marketing and project financing options, is being undertaken.”