Kunlun Energy Company Limited, formerly CNPC Limited, became a Hong Kong-listed company in 1993 through a backdoor listing. Its parent company is the China National Petroleum Corporation which itself was created from the transformation of the Ministry of Petroleum Industry of China in 1988. It is engaged in the investment of exploration, development and production of crude oil and natural gas in China, Kazakhstan, Oman, Peru, Thailand, Azerbaijan and Indonesia. Wikipedia