In order to improve displacement characteristics, and decrease injection pressure and formation pressure, periodical polymer injection is executed in this block, and the application results are better.

Study of numerical simulation of cyclic waterflooding in Li 33-19 well group of Lijin oilfield.;

Practice and recognition of cyclic waterflooding in Zhuang 45-1 block of Zhuangxi oilfield.;

Analyze Effect of Geologic Factor in Cyclic Waterflooding;

According to the reservoir depositional properties and the distribution law of remaining oil,this paper analyzed the past cyclic injection based on hydrodynamic theories and former experiences.

The indoor experiments on cyclic water flooding were made to research the oil expelling and displacement mechanism for increasing oil recovery by using long core model.

Study on cyclic water injection test in Gasikule Oilfield;

Accoding to these geological evidence,improved waterflooding adjustment,classified curing for low efficiency wells and cyclic water injection are performed to impr.

The result shows that cyclic water injection may be more effective if increasing oil-water percolation rate, standup pressure time and water holdup coefficient.

Lab study on cycle injection of heterogeneous sandstone reservoir;

Development and application of mathematical models for cycle injection of heterogeneous layered sandstone reservoir;

The cycle injection math model for fracture stone reservoir is established, and both of analysis solution and numerical solution are given in this paper.