关键词: 剩余油, 油水分布, 水淹, 加密, 调整挖潜, 井网密度

Abstract: Northern part of Daqing oilfield is now entering a stage of high water-cut. It is fairly difficult to keep the stable daily output. A sophisticated study of the remaining oil in the reservoir and its cause is required to make a practical adjustment technique so as to keep a stable production of the oilfield as a whole. This paper, based on a detailed reservoir description well behavior and reservoir behavior (with a sandbody as a unit) analysis, summarizes out a macroscopic method of remaining oil study, gives an analysis of the causes of remaining oil left in the reservoir, and the characteristics of the distribution of various types of remaining oil as well as their ratio, and suggests an effective method in planning out the secondary infill drilling and adjustment program for oilfield development. Actual example is given (a pilot area for secondary infill drilling) to demonstrate the correctness of the conclusion as well as the method of study. Thus, an evidence is provided for a further infill drilling and adjustment program for the oilfield development.