Horizon Oil reported Monday that it had advised on Oct. 2 that data from logs and pressure measurements had confirmed a significant gas/condensate discovery in the primary target Elevala Sandstone in the Tingu-1 exploration well in Petroleum Retention License (PRL) 21, Western Province, Papua New Guinea (PNG). The well encountered a gas water contact in that reservoir consistent with that in the Elevala accumulation to the southeast, implying a connected field of considerable size.
Data from the Toro Formation underlying the Elevala Sandstone indicate that a possible gas column also exists in that reservoir up-dip from the Tingu-1 location.
Since the time of the last report, logging operations were finalized and a 7 inch liner run and cemented at a measured depth of 10,610 feet (3,234 meters). After running a completion tubing string and installing the Christmas Tree, the well was perforated across a 23 foot (7 meter) interval in the Elevala Sandstone Oct. 24 and production testing operations commenced. At the end of the clean-up flow period, the average flow rate was 48 million cubic feet of gas per day (mmcf/d) on a 72/64 inch choke, with no water, indicating high deliverability from the reservoir which is encouraging for future production operations. For the main flow period, the gas was flowed to a test separator and an average condensate gas ratio (CGR) of 65 barrels of condensate per million cubic feet of gas was measured over a three hour period, after which hydrocarbon samples were taken for compositional and pressure analysis. This analysis will be required to confirm the flow test results and CGR, but it is certainly an encouraging result so far.
The well is currently shut-in for pressure build-up measurement. The forward plan is to carry out multi-rate flow testing and then suspend the well for future service in production operations.
Tingu-1 spudded Aug. 26 with Parker Rig 226. The well is located 5.7 miles (9.2 kilometers) northwest of the Elevala-2 appraisal well, itself a stepout from the Elevala-1 discovery well, which both found condensate-rich gas in the Early Cretaceous Elevala Sandstone.
The Tingu accumulation is potentially similar in size to the Elevala gas-condensate field (2C contingent resource of approximately 400 billion cubic feet of gas and 22 million barrels of condensate). Horizon Oil, as operator of PRL 21, is currently carrying out FEED (front end engineering and design) of the Elevala and Ketu field developments. The Tingu gas-condensate accumulation will be incorporated in the development scope.
Participants in the PRL 21 joint venture are:
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