Premier Oil (LON:PMO) has plugged and abandoned the Chim Sao North West appraisal well, CS-3X, in Vietnam Block 12W.
The well was drilled to determine whether the Chim Sao North West discovery extended into a separate fault segment to the north.
While 135 metres of sandstone reservoir were penetrated in the Upper Dua interval there was no indication of hydrocarbons.
In the Middle Dua interval 165 metres of sands were drilled, but only oil shows were encountered.
Before drilling the appraisal well, Premier drilled the CS-N17XP well 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,” said chief executive of Premier Oil Simon Lockett.
“Meanwhile, the initial production rates from the Chim Sao North West accumulation are extremely encouraging.”
Shares in Premier changed hands at 382.1 pence at 8:15am, down two percent from Thursday’s close. The group currently has a market cap of GBP 2 billion.