深部调驱技术在洲城复杂断块油藏研究中的应用

An application of the deep profile modification technology in studying the Zhoucheng complicated fault block oil reservoir in Subei Basin,China

开展适合极复杂断块中高渗透油藏特性的调驱体系研究和应用,以提高水驱波及体积。通过对油藏注水动态特征和有机冻胶类深部调驱体系的评价研究与调驱现场应用,研究形成了适合于苏北盆地洲城油田的深部调剖工艺技术,所研制的聚合物冻胶深部调驱体系交联时间、交联强度可控,具有较强的选择性注入和封堵能力,同时与地层配伍性和稳定性较好。现场应用后,见到了注水压力升高、油井含水下降、产油量增加的理想效果。说明深部调驱能够解决极复杂断块油藏注入水沿冲刷孔道无效循环、水驱波及效果差、采收率低的问题。

This paper develops the deep profile modification technology suited to the extreme complicated middle-high permeability fault block oil reservoir to improve the flooding area. The technology of deep profile modification which is suitable for the Zhoucheng oil field is created on the basis of the study of water flooding characters and the evaluation of the cross linked organic deep profile modification system and the field application. The cross linking time and the gel strength of the deep profile modification system can be adjusted, and the ability of selecting injection and blocking is obtained in the system. And the compatibility to the reservoir is also good. After filed application, the injection pressure increased in injection wells, the water cut dropped and the oil production rate increased in production wells. The result shows that the deep profile modification can solve the problem of lower oil recovery rate caused by water breakthrough.