Sep. 18, 2009 (China Knowledge) - PetroChina Co Ltd<601857><0857><PTR>, the country's largest oil and gas producer and distributor, plans to triple the natural gas output of Daqing Oil Field, the country's top terrestrial oil producer, to between billion and 10 billion cubic meters, the Xinhua News Agency reported, citing Wang Yongchun, general manager of Daqing Oil Field, as say
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