Pressure gauges sit on pipework at a shale gas collection and transfer facility at the Fuling shale gas project site, operated by Sinopec Chongqing Fuling Shale Gas Exploration and Development Co., a unit of China Petrochemical Corp. (Sinopec), in Jiaoshiba, Chongqing Municipality, China, on Wednesday, June 20, 2018. In 2013, the U.S. Department of Energy estimated China was sitting on the world's largest reserves of shale gas, almost double the U.S. and enough to theoretically supply the country for more than a century. The reserves are also deeper, harder to reach and more broken up than those in North America. Photographer: Qilai Shen/Bloomberg

Surging gas prices squeeze PetroChina with $3bn loss looming

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