Changqing oilfield, China’s largest oil-and-gas field, achieved a historic milestone recently by producing a cumulative total of 1 billion metric tons of oil and gas equivalent, according to PetroChina Changqing Oilfield Company. Last year, it became the first oilfield in China to pass the 60-million-ton mark in annual oil and gas output, a landmark in … Continue reading China’s largest oil field achieves historic milestone