An employee monitors work via the command center of the second oil production plant of Petro China Changqing Oilfield Company in Qingcheng county of Qingyang city, Northwest China's Gansu province, on Dec 9, 2021. The company boasts a smart production command system, which can constantly enhance oilfield development and ensure a stable increase of oil and gas production, to help guarantee fuel supplies for winter and spring. [Photo/Xinhua]
Employees work on a platform at a national shale oil development demonstration zone in Huachi county of Qingyang city in Northwest China's Gansu province on Dec 10, 2021. [Photo/Xinhua]
A worker sets parameters for an automatic meter reading device at a platform of a national shale oil development demonstration zone in Huachi county of Qingyang city in Northwest China's Gansu province on Dec 10, 2021. [Photo/Xinhua]
Workers check on production at a well site of the Nanliang oil extraction operation area in Nanliang town of Huachi county, Qingyang city, in Northwest China's Gansu province, on Dec 10, 2021. [Photo/Xinhua]
An aerial photo taken on Dec 10, 2021, shows a well site of the Liangsizhuan central station in the Nanliang oil extraction operation area of Nanliang town in Huachi county of Qingyang city, in Northwest China's Gansu province. [Photo/Xinhua]
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