OREANDA-NEWS. March 18, 2014. PetroChina (PTR.NYSE; 00857.HK; 601857.SH), China's largest oil and gas producer, said in an online news release that the daily crude oil output of its Qinghai oilfield remained above 6,000 tonnes during the first two months of this year, the most difficult production season for the oilfield.

The output was a historical high, up 5.6 percent compared with the output during the same period of last year.