摘要
从混相区域判定机理入手,引入界面张力与流体粘度作为辅助指标,修正了CO2混相区域的判定方法,分析了一维长岩心CO2实验中,岩心内部界面张力的变化规律以及混相区域的分布规律,得到了不同CO2注入PV数下,混相体积的变化规律;将一维数值模型拓展到二维,分析了不同流动状态下,原油采出程度以及混相区域的波及规律。研究结果表明,以界面张力与流体粘度作为辅助指标来划分混相区域,提高了混相区域判断方法的精确程度;低渗透CO2驱存在混相区、高界面张力的非混相区、未波及非混相区及低含油非混相区四个区域;混相驱过程中CO2对轻质组分的抽提作用更强;得到了五点和七点井网混相区域波及规律。
From the judgment mechanism of miscible area and through introducing interfacial intense and fluid viscosity as auxiliary indexes,judging method of CO2 miscible region is modified,and the variation law of interfacial intense inside the core and the distribution law of miscible area are analyzed in CO2 experiment of the one dimensional long core,and the variation law of miscible volume at different injection PV of CO2 could be obtained. Extended one dimensional numerical model to two dimensional model,crude oil recovery and sweep law of miscible area at various flowing conditions are analyzed. The results show that using the interfacial tension and viscosity of the fluid as an assistant standard to divide the miscible region,the accuracy of the miscible region judgment method is improved in low permeability reservoir CO2 flooding. There are four regions of miscible region,high interfacial tension of immiscible region,un-swept immiscible region and low oil immiscible region. CO2 flooding has stronger extraction effect on the light components. The miscible region and rules of the five point and seven point well pattern are obtained.
出处
《油气井测试》
2014年第4期1-3,8,共4页
Well Testing
基金
国家973重大专项"CO2驱渗流力学理论"(2011CB707305-005)
重大专项"海上油田丛式井网整体加密及综合调整技术"(2011ZX05024-002-006)内容
关键词
低渗透油藏
CO2驱
混相区域
井网
波及规律
low permeability oil reservoir,CO2 flooding low,miscible region,different well pattern,spread rule
