严重非均质油藏开发层系重组渗透率级差界限研究  

A study on max/min permeability ratio boundary for reasonable developed-layer recombination in extremely heterogeneous reservoirs

作　　者：陈民锋[1] 姜汉桥[1] 曾玉祥 

机构地区：[1]中国石油大学(北京) [2]中国石油吐哈油田分公司

出　　处：《中国海上油气》2007年第5期319-322,326,共5页China Offshore Oil and Gas

基　　金：中国石油天然气集团公司石油科技中青年创新基金资助项目"高含水期油藏大孔道动态变化机理与识别模型(编号:04E7029)"部分成果

摘　　要：提出了严重非均质油藏水驱开发后期层系优化重组的调整思路,以及确定多层组合渗透率级差界限的方法。根据油藏动、静态资料,合理选取严重非均质油藏(以胡7南沙三中为例)储层渗透率和级差分布;通过长岩心水驱油实验,确定影响单层驱替效果的主要因素,为数值模拟研究提供参数取值依据;考虑启动压力的影响,对不同渗透率储层在多层组合条件下的驱替进行模拟研究;提出用综合影响因子来反映非均质性对低渗透层动用特征、驱替效果的影响程度,并确定多层组合的渗透率级差合理界限。这些研究结果可为同类油藏水驱开发后期层系优化重组等开发政策的制定提供参考。This paper has presented an adjustment concept to optimize layer recombination for mature waterflood reservoirs with severe heterogeneity and an approach to determine max/min permeability ratio boundary for any multiple-layer combination.The distributions of reservoir permeability and its max/min ratio can be selected for extremely heterogeneous reservoirs.Reasonable selections are done for the permeability and its grading distribution of Hu-7Nan(such as Hu-7-Nansha 3 middle) by using dynamic and static reservoir data. The main factors affecting single layer displacement can be determined by water displacing oil experiments through long cores,providing a foundation for numerical simulations.In consideration of startup pressure effects,the water displacing oil process under a combination of multiple layers with different permeability has been modeled.An integrated contributory factor is delivered,which can be used to reflect a quantitative effect of heterogeneity on production characteristics and displacement efficiency of low permeability layers,and to determine a reasonable max/min permeability ratio boundary for combinations of multiple layers.All these results can provide references for making later development strategy such as layer recombination optimization in extremely heterogeneous reservoir.

关 键 词：开发层系重组 渗透率级差 综合影响因子 渗透率组合界限 数值模拟 

分 类 号：TE5[石油与天然气工程—油气田开发工程]