Hong Kong-listed CNOOC Limited said its offshore oilfield, BZ 25-1/BZ 25-1S, has come on stream, producing about 16,000 barrels of oil per day from 52 wells with 32 additional wells being completed.   Phase two production is expected to be on stream by early 2006.   BZ 25-1/BZ 25-1S is located in the east part…