油藏高含水开发期确定采收率的一种新方法  

A new method to calculate recovery efficiency at high water cut stage

作　　者：谷建伟[1] 李晓庆[1] 

机构地区：[1]中国石油大学石油工程学院,山东东营257061

出　　处：《大庆石油地质与开发》2007年第1期54-56,共3页Petroleum Geology & Oilfield Development in Daqing

摘　　要：水驱油藏进入高含水开发期以后,常规的水驱曲线对采收率的标定会出现很多问题。在高含水开发期,地层中油相的相对渗透率比较小,相对于相渗曲线上为后期比较扁平的阶段,在该阶段可以将油相的相对渗透率与含水饱和度之间的关系看成线性关系。在此基础上,从渗流力学和物质平衡原理角度出发,利用产量公式和相对渗透率曲线推导出处于产量递减期间的油藏采油速度与采出程度之间的关系,发现存在线性特征。在给出最低的经济极限采油速度的情况下,利用该关系可以对油藏动态和经济采收率进行标定,同时给出了其适用条件。并利用孤东七区西Ng63+4的生产数据进行了实例验证,给出了该油藏的经济采收率,效果明显。There are many problems when calculating water cut development stage for water drive reservoir. recovery efficiency with conventional water flood curve at the high At that time the relative permeability of oil phase is lower, so the oil phase curve displays relative flat on phase permeability curve, and the relationship between oil phase relative permeability and water saturation can be considered as linearity. From the viewpoint of fluid dynamic through porous mediunl and nlaterial balance principle, with the application of production equation and relative permeability curve, the relationship between oil recovery rate and recovery percent of reserves as oil production declines has been derived, and their linear feature is also confirmed. Giving the lower economic limit of oil production, the reservoir behavior and economic oil recovery can be calculated by means of the relationship above mentioned. Simultaneously, its applicable conditions ale proposed. This study has been confirmed by the production data of Ng6^3＋4 in Western Block 7 of Gudong reservoir, and the corresponding economic recovery efficiency also shows its feasibility.

关 键 词：高含水开发期 经济采收率 采油速度 采出程度 

分 类 号：TE311[石油与天然气工程—油气田开发工程]