The oil exploitation process is generally divided into three stages. The primary oil recovery stage mainly relies on the energy of the formation itself to drive the flow of oil underground. As the energy of the bottom layer decreases, it is necessary to inject water to the oil layer (or gas, etc.) to become the secondary oil recovery， for example, using smart water injection system. At present, most of China's oil fields are in the stage of secondary oil recovery, with nearly 90 tons of water per 100 tons of produced liquid, and one pumping unit consumes nearly 200,000 kilowatt electricity a year. Moreover, the water is rising. How to reduce the water content and produce nearly 70% of the oil still left underground is a difficult task for oilers.
It is a resounding slogan proposed by the oil man to carry out oil recovery three times and improve oil recovery. The third time oil recovery refers to a method of oil recovery by injecting chemicals into the formation to drive out oil. China is the country with the highest degree of industrialization of third time oil recovery in the world. The research and application of polymer flooding technology is in the forefront of the world. In recent years, the oil production of tertiary oil production has accounted for 6% of China's oil production, and has increased year by year. Therefore, carrying out tertiary oil recovery with intelligent oil production increased system is a strategic requirement to slow down the aging rate of most oilfields in China, maintain the stable production of oil in China, and reduce China's dependence on foreign oil.
With the further popularization and application of polymer flooding technology, there are fewer and fewer oilfields suitable for polymer flooding. How do more than 95% of oilfields that are not suitable for polymer flooding recovery oil in three times? How to improve oil recovery rate for production optimization for oil? At present, there are two feasible directions. One is to improve the salt and temperature resistance of the polymer and expand the application range of the polymer flooding. The second is to develop a composite flooding system based on surfactants.
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