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水平井井区不稳定注水数值模拟——以敖南油田M72水平井井区为例

ISSN号：1009-9603
期刊名称：《油气地质与采收率》
时间：0
分类：TE341[石油与天然气工程—油气田开发工程]
作者机构：[1]东北石油大学,黑龙江大庆163318, [2]中国石油大庆油田有限责任公司第七采油厂,黑龙江大庆163517
相关基金：国家自然科学基金重点项目“低渗透油层提高驱油效率的机理研究”（50634020）

关键词：水平井, 不稳定注水, 数值模拟, 注水强度, 注水周期, horizontal well, imbalanced injection , numerical simulation , water injection per unit thickness , water injection cycle

中文摘要：

敖南油田M72水平井井区具有低渗透裂缝性油田特征,油田目前开发过程中水平井产量递减较快,为确保水平井井区的高效开发,对该区块不稳定注水方法进行了数值模拟研究。在应用Petrel地质建模软件与Eclipse数值模拟软件的基础上,对模拟区进行了精细地质建模与历史拟合,并设计了多种不稳定注水调整方案,以确定水平井不同储层、不同部位的合理注水强度以及合理注水周期,分别预测各方案的开发指标,对比不同方案的开发效果,最后综合各优化方案,总结出一套适合敖南油田水平井—直井联合开发的注水调整方案。结果表明,对于厚度小且渗透率低的储层适合采取对水平井加强指端注水、控制根端注水的方法,且指端与根端注水量之比为1.14,区块的合理注水强度为2.1 m3/（d.m）,合理注水周期为3个月。

英文摘要：

The M72 horizontal block of Aonan oilfield has the property of low permeability and fracturing.In view of the present situation that production quickly declines during the process of development,the fluctuating injection is studied in this block with numerical simulation in order to maintain high efficient development in this area by means of horizontal well.Based on the software of Petrel and Eclipse,Detailed geological model is established and history matching is done,as well as many kinds of adjusting schemes with fluctuating injection are designed in order to ascertain appropriate water injection per unit thickness of horizontal well in different reservoir and localization,and ascertain appropriate water injection cycle.Development index of every scheme is sepa-rately forecasted,exploration effect is compared between different schemes,and finally injection strategy is summarized,which is applicable for unit exploration in horizontal well and vertical well in Aonan oilfield after referencing all kinds of optimized schemes.The results demonstrate that,in the oilfield,the reservoir of low permeability and fine thickness is suitable to adopt the method of increasing the finger-end water injection and control the root end injection in horizontal well,and the ratio of water in-jection rate of finger-end to root-end is 1.14,the optimized water injection per unit thickness is 2.1 m3/（d·m）,the appropri-ate water injection cycle is 3 months.The results are of great significance to the later development in the area of horizontal well in the block of M72 in Aonan oilfield.

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