考虑启动压力梯度的聚合物驱数值模拟  

Numerical simulation study of polymer flooding considering start-up pressure gradient

作　　者：聂俊[1] 于洪敏[1] 王友启[1] 刘平[1] 许关利[1] 张莉[1] 

机构地区：[1]中国石化石油勘探开发研究院,北京100083

出　　处：《油气地质与采收率》2017年第1期106-110,共5页Petroleum Geology and Recovery Efficiency

基　　金：中国石化科技攻关项目"低渗透油藏化学驱机理及数值模拟方法研究"(P13124)

摘　　要：针对目前常用的化学驱数值模拟软件并不适用于低渗透油藏的问题,通过室内实验开展低渗透油藏聚合物驱油机理研究,量化表征中国石化江苏油田低渗透油藏中聚合物驱的关键物性参数,分别采用拟启动压力梯度模型和非线性模型建立低渗透油藏聚合物驱数学模型,进行数值求解并应用。研究结果表明,中国石化江苏油田低渗透油藏聚合物驱适宜采用相对分子质量为600×10~4~900×10~4的聚合物;拟启动压力梯度模型忽略了渗流曲线的弯曲段,夸大了低渗透油藏的渗流阻力,而非线性模型更适于模拟低渗透油藏聚合物驱过程。在江苏油田沙7断块的应用结果表明,基于非线性模型建立的数值模拟方法能够考虑低渗透油藏聚合物驱过程中启动压力梯度的影响,模拟计算结果与矿场实际生产数据更加吻合,为低渗透油藏化学驱的方案优化与动态预测提供了有效的技术与方法。In view of the current commercial numerical simulation software of chemical flooding is not suitable for low permeability reservoir,the mechanism of polymer flooding in the low permeability reservoir was studied by laboratory experiments. The key physical property parameters of polymer flooding in the low permeability reservoir in SINOPEC Jiangsu oilfield were characterized quantitatively,and the mathematical model of polymer flooding in the low permeability reservoir was established by using the pseudo- start- up pressure gradient and nonlinear model respectively,and the model was solved by numerical method. Research results show that the suitable relative molecular mass is 6 million to 9 million for the polymer flooding in the low permeability reservoir. The pseudo-start-up pressure gradient model ignores the bending section of the percolation curve and exaggerated the seepage resistance of the low permeability reservoirs,so the nonlinear model is more suitable for the simulation of polymer flooding process in the low permeability reservoir. The application in Sha7 block of Jiangsu oilfield shows that the numerical simulation method based on the nonlinear model can consider the influence of start-up pressure gradient for the polymer flooding in the low permeability reservoir,and the simulation results are consistent with the actual production data of the oilfield. It provides an effective technique and method for the optimization and dynamic prediction of chemical flooding in the low permeability reservoir.

关 键 词：低渗透油藏 聚合物驱 启动压力梯 度数值模拟 渗流实验 江苏油田 

分 类 号：TE357.431[石油与天然气工程—油气田开发工程]