PetroChina Southwest Oil and Gas Field Company, a subsidiary of China's top oil and natural gas producer PetroChina (PTR.NYSE; 00857.HK; 601857.SH), has produced 801 million cubic meters of shale gas accumulatively, according to the company. By September 20, the company has 71 shale gas wells in trial production and completed the drilling of 144 shale gas wells, said Wang Lansheng, chief geologist with the company.
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