Premier Oil Abandons Chim Sao Appraisal

The Chim Sao North West appraisal well, CS-3X, in Vietnam Block 12W has reached a total depth of 13,894 feet (4,235 meters). The well has been plugged and abandoned after encountering oil shows in the Middle Dua sands.

The appraisal well was drilled to determine whether the Chim Sao North West discovery extended into a separate fault segment to the north. The well targeted the Upper and Middle Dua sands. While 442 feet (135 meters) of sandstone reservoir were penetrated in the Upper Dua interval there was no indication of hydrocarbons. In the Middle Dua interval 541 feet (165 meters) of sands were drilled, but only oil shows were encountered.

The CS-N17XP well, which was completed immediately prior to the appraisal well, was drilled to produce from the North West extension to the Chim Sao Field. That well was brought on-stream earlier this month with initial extended production test rates averaging 4,000 barrels of oil per day from four Upper Dua reservoirs.

"The information gained from the appraisal well will now be integrated with Premier's existing knowledge to better understand the potential in the other untested areas adjacent to the Chim Sao discovery. Meanwhile, the initial production rates from the Chim Sao North West accumulation are extremely encouraging," Chief Executive Officer Simon Lockett commented.



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