摘要
为了进一步研究渗透率的分布对注水开发过程波及系数的影响,将数理统计理论的随机分布模型引入到油藏渗透率参数场的构建中,结合低渗透油藏的渗流机理,对参数场进行了修正,在此基础之上,应用数值模拟方法研究了不同渗透率随机分布模型、不同开发井网下波及系数的变化规律、注采流线的分布特征及剩余油分布规律。应用表明,修正后的参数场能较好地反映低渗透油藏的非均质特征;三种随机分布模型生成的渗透率参数场对评价波及系数影响较大;由于启动压差的存在,低渗透油藏在开发后期存在大量的剩余油绕流区。通过适当增大生产压差来克服启动压差,让更多的剩余油绕流区参与流动从而有效提高采出程度,但是应该注意的是不能将生产压差放得过大,以免造成水窜。
In order to further study effect of the permeability distribution on sweep efficiency in the process of water flooding development, the mathematical statistical theory of random distribution model was introduced into the reservoir permeability parameter field construction, combined with flow mechanism in the low permeability reservoir, the parameter field was modified. On this basis, the random distribution model of different permeability, the change laws of sweep efficiency under different development hole pattern, distribution features of injection-production streamline and remaining oil distribution were studied by using numerical simulation method. The field application showed that modified parameter field could better reflect the characteristics of low permeability reservoir heterogeneity. The effect of permeability parameter field generated by three kinds of random distribution models on the sweep efficiency was very large. Since start-up pressure difference existence, a large number of surplus oil flow region existed in low permeability reservoir at the late stage of development. Through appropriate increasing production pressure difference overcome startup pressure difference, let more remaining oil flow area participate in flow so as to effectively improve the recovery degree, but if the production pressure difference was too big, water breakthrough was easily caused.
出处
《钻采工艺》
CAS
北大核心
2013年第1期39-42,10,共4页
Drilling & Production Technology
基金
国家油气重大专项"剩余油分布综合预测与层系井网重组技术"(编号:2008ZX05010-003)资助
关键词
数理统计学
数值模拟
启动压差
波及系数
剩余油
mathematical statistics, numerical simulation, start-up pressure, sweep efficiency, remaining oil
