多层油藏水驱驱替效率计算新方法  

A new calculation method of water displacement efficiency for layered reservoir

作　　者：周英芳[1] 刘志军[1] 茆春锦[1] 王晓冬[1] 张博[2] 

机构地区：[1]中国地质大学,北京100083 [2]中油长庆油田分公司,陕西西安718613

出　　处：《特种油气藏》2008年第3期72-75,共4页Special Oil & Gas Reservoirs

摘　　要：准确计算砂层间由不可渗透页岩或致密砂岩层分隔多层油藏水驱驱替效率可以为高效、合理开发油藏提供理论依据。为此,应用达西定律和Buckley-Leverett方程找出了各层突破时油藏总体含水率的确定方法,并通过约束最小二乘法回归得到了含水率方程,最终结合Welge-Craig方程得出了一种计算多层油藏水驱驱替效率的新方法,并通过矿场实例验证了该方法对于多层油藏水驱开发中后期驱替效率预测的适用性。Accurate calculation of water displacement efficiency in layered reservoirs separated by impermeable shale or tight sand can provide theoretical basis for efficient and rational development of the reservoir. Hence, a method for determining total water cut at breakthough is given by using Darcy’s law and Buckley-Leverett equation, and the equation of water cut is derived by regression through constraining least square method. Finally, a new method of calculating water displacement efficiency for layered reservoir is derived with combination of Welge-Craig equation. The applicability of this method has been verified through field application in prediction of displacement efficiency in mid-late stage of waterflooding for layered reservoirs.

关 键 词：多层油藏 水驱开发 含水率方程 约束最小二乘法 驱替效率 

分 类 号：TE327[石油与天然气工程—油气田开发工程] TE341