The commercial oil flow from K pay zone in well No. 1 on 27th Aug. 1939 revealed Laojunmiao oilfield. Yumen mine was liberated on 25th Sept. 1949. In 1957, Yumen oilfield – the first natural oil base in new China was brought into being. In 1959, its oil production was 140.29 X 104 t/a, accounting for 50.9% of the total production in China. An excellent achievement of steady production at 60×104 t/a for ten years in 70’s last century and at 50×104 t for ten years in 80’s was made.

Yumen is the first fossil oil base as well as the first oil city in China, which has 60 year history in oil recovery and processing as called as a cradle for the Chinese oil industry. In terms of production stabilization in mature oilfield, it reaches the standard of class one oilfield in CNPC and its major oilfield – Laojunmiao has been appraised as one of 14 oilfields with high efficiency in development, which creates the highest record in Chinese oilfield development history.