Crude oil output from China's biggest oilfield Daqing during the first half of this year totaled 22.7m tons, exceeding its target, state media reported. The oilfield also produced 1.2bn cubic meters of natural gas during the six-month period. Wang Yupu, chairman of the Daqing Oilfield Corp, said the company is utilizing new oil extracting techniques to extend the production life of the oilfield and improve economic efficiency.