Premier Oil reports thattThe 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.