This paper mainly talks about that the world oil industry always pays special attention to the effect of water injection at the high water-cut stage in the oilfield, which relates to the crude output and the economic benefits of the exploitation in the old oilfields. The thesis continues to probe into and study on the mechanism of the water injection and the means of improving the effect of water-injection development at the high water-cut stage. Through a series of research and analysis, people draw up an ...