PetroChina Company Limited (Simplified Chinese: 中国石油天然气股份有限公司), (TraditionalChinese: 中國石油天然氣股份有限公司)(Uyghur: چوڭگو نېفتى‎) (SEHK: 0857, SSE: 601857, NYSE: PTR) is a Chinese oil and gas company and is the listed arm of state-owned China National Petroleum Corporation (CNPC), headquartered in Dongcheng District, Beijing. It is China's biggest oil producer.