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下二门油田开发后期剩余油主要分布在中高水淹区,调剖是改变渗流方向、提高储量动用程度的重要手段之一。根据油藏地质特点,选用交联聚合物调剖体系和含油污泥调剖体系。前者适用于非均质性比较严重、地层孔隙度20%以下、渗透率<0·5μm2的油藏、采出程度较低的单井点或小断块的调剖,以改善平面矛盾为主。后者适用于采出程度比较高、地下大孔道发育、油层连通状况好的整装油藏的整体深度调剖。通过5个层系23口井的实施,增油7600余吨,对油田稳产发挥了重要作用。
The remaining oil in the Xiaermen oilfield is mainly distributed in the middle and high flooded areas. Profile control is one of the important measures to change the seepage direction and increase the utilization of reserves. According to the geological characteristics of the reservoir, cross-linked polymer profile control system and oil sludge control system. The former is applicable to the profile control of single wells or small fault blocks with relatively low heterogeneity, less than 20% of porosity in the formation and permeability less than 0.5μm2 to improve the plane contradiction . The latter is suitable for the overall depth profile of a fully assembled reservoir that has a relatively high production level, large underground channels and good reservoir connectivity. Through the implementation of 23 wells in 5 strata, the oil increase of 7,600 tons has played an important role in stabilizing oil production.