In the North Pars oil field, investment from the CNPC expedited liquefied natural gas factories and transportation facilities for liquefied natural gas. In 2009, the CNPC promised Iran $6.5 billion in investment for refining equipment. Hence, it can be suggested that a mutually beneficial relationship existed between Chinese energy corporations and the Iranian government. This enabled Iran to obtain the basic infrastructure needed for its oil refineries, while at the same time granted China with the rights associated with Iranian oil and gas fields.