周期注水改善水驱效果原理及适用条件分析

Analysis of Principle and Applicable Conditions of Periodic Water Injection for Improving Water Flooding Effect

通过国内外长期的理论研究和矿场实践,从研究区常规注水效果减弱,开发效果变差的现状分析,若要提高剩余油的采收率,需要在地层中施加一个不稳定压力场使得地层中油水不断进行交换和重新分布,因此开展周期注水是非常必要的。油藏若要采用周期注水,需明确储层非均质特征、油层不连通程度、注水工艺与注水量要求等基本参数,从而确定周期注水的方式以及合理的注水时机,以便取得良好的开发效果。

Through long-term theoretical research and field practice at home and abroad, from the analysis of the status quo of weakening conventional water injection effect and worsening development effect in the study area, in order to improve the recovery of remaining oil, it is necessary to apply an unstable pressure field in the formation to make oil and water exchange and redistribute continuously in the formation, so it is very necessary to carry out periodic water injection. If periodic water injection is to be used in reservoirs, the basic parameters such as reservoir heterogeneity, reservoir disconnection, water injection technology and water injection volume need to be clarified, so as to determine the mode of periodic water injection and reasonable water injection timing, so as to achieve good development results.