The petroleum industry is divided into upstream, midstream, and downstream, and the relationship between the upstream and downstream industrial chains is very close, with a very distinct industrial chain structure and information transmission effect. Among them, the upstream business includes the exploration and development of crude oil and natural gas, while the midstream mainly focuses on the storage and transportation of oil and gas. The downstream business includes process oriented businesses such as refining, chemical engineering, and natural gas processing, as well as product distribution and sales businesses such as gas station retail. Usually, the processing industry that produces petroleum products and petrochemical products from oil and natural gas is referred to as the petrochemical industry, while the rest are collectively referred to as the petroleum industry. The main production and business activities of the petroleum industry include oil and gas exploration, oil and gas field development, drilling engineering, surface construction, petrochemical industry, storage and transportation sales, as well as business management.