特稠油油藏注氮气可行性分析  

Feasibility analysis of nitrogen-assisted steam stimulation in super-heavy oil reservoir

作　　者：杜殿发[1] 郭青[1] 王青[1] 张亮[1] 石达友[1] 姜林[1] 

机构地区：[1]中国石油大学,山东青岛266555

出　　处：《石油钻采工艺》2008年第6期75-79,共5页Oil Drilling & Production Technology

摘　　要：蒸汽吞吐是特稠油油藏开采的主要方法,但随着吞吐轮次增加,地层能量下降,周期产油减少,开采效果变差。结合新疆九7+8区地质特征,建立理论模型,通过数值模拟对蒸汽吞吐后期采取注氮气改善吞吐效果进行可行性分析,对混氮比、注入时机、注入方式、注入速度等注氮参数进行优选。模拟结果表明,注氮气后单井周期产油量平均提高6146.9t,含水率平均降低15%。注汽过程中注氮气的方法可在很大程度上改善超稠油的开发效果,为有效开发此类难动用储量提供借鉴。Steam soak is mainly used to develop super-heavy oil reservoir. With the increase of circulation turns, formation pressure and periodic oil production decrease rapidly, and production effect is poor. This paper builds a theoretical model with integration of geological characteristics of Jiu 7＋8 block in Xinjiang. Then by numerical simulation, it analyzes the feasibility to inject nitrogen at late stage of steam soaking and optimizes the key parameters of mixed nitrogen ratio, injection timing, injection mode, injection rate and so on. Simulation results show that average periodic oil production of single well after nitrogen injection increases 6146.9 ton,water cut decreases 15%. To inject nitrogen during steam soaking can improve development effect of super heavy oil reservoirs to a great extent, and provide reference for development of similar difficult-to-produce reserves.

关 键 词：特稠油油藏 氮气辅助蒸汽吞吐 数值模拟 参数优选 

分 类 号：TE357.7[石油与天然气工程—油气田开发工程]