PetroChina Company, Limited () ( ) is a Chinese oil company and is the listed arm of state-owned China National Petroleum Corporation (CNPC), mainland China's biggest producer of oil. and following its debut on the Shanghai index, its market value tripled. History PetroChina was established as a joint stock company with limited liabilities under the Company Law of the People's Republic of China (the PRC) on November 5, 1999, as part of the restructuring of CNPC. In the restructuring, CNPC inj… (More on Petrochina)