Abstract: A kind of acid pickling technology is introduced to treat Weizhou6-1 oilfield in the Beibuwan Gulf. The principles of acid pickling, evidences of treating and operation process are described in detail. Two wells in Weizhou6-1 oilfield are treated by acid pickling and gas lift, and both of them exceed the allocated oil production. This kind of technology has enormous advantages and it will be reference for similar offshore oilfields in the South China Sea.