Study on the Technology of High Efficiency Chemical Flooding to Improve Recovery of Low Permeability Reservoir

The three types of oil reservoirs in Xingbei Development Area belong to low permeability reservoirs, which are characterized by thin thickness, low permeability and poor connectivity. After a long period of water flooding development, the heterogeneity between layers and planes is more prominent, the remaining oil is scattered, and the water flooding development is difficult. Therefore, it is urgent to develop and implement a new technology of greatly enhanced oil recovery. According to the reservoir characteristics of interior in different oil displacement system optimization and evaluation of chemical agents for various performance parameters, study drug compatibility with reservoir, the performance is good, the cost is relatively low chemical flooding technology is applied to the scene. The results show that chemical flooding in low permeability reservoir can displace the remaining oil which is not produced during water flooding, and the effect of increasing oil production and dewatering is obvious, oil well center stage of chemical flooding to improve oil recovery by more than 12%, the cost per ton of oil is 29% lower than that of common polymer flooding. It has a good prospect of popularization and application. It provides a new way of enhancing oil recovery for three types of reservoir in low permeability.