普通稠油降黏剂驱物理模拟和数值模拟  

Physical Experiments and Numerical Simulations of Viscosity Reducer Flooding for Ordinary Heavy Oil

作　　者：刘祖鹏[1] LIU Zu-peng(Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying 257015,China)

机构地区：[1]中国石化胜利油田分公司勘探开发研究院

出　　处：《科学技术与工程》2020年第1期164-169,共6页Science Technology and Engineering

基　　金：国家科技重大专项(2016ZX05011-003);中国石化科研项目(P17003)

摘　　要：为实现普通稠油热采向降黏剂驱的转换,首先通过实验评价了降黏剂的静态性能参数,然后通过岩心驱替实验开展了降黏剂驱注入特征和驱油效果研究,其次通过微观可视化实验研究了降黏剂驱提高采收率的机理,最后运用非线性混合法则的方法,得到了降黏剂在数值模拟中的实现方法;并对物理模拟结果进行了数值模拟计算和历史拟合。研究结果表明,稠油降黏剂驱过程中能够形成稳定的水包油乳状液;稠油驱替过程可划分三个阶段:启动压力突破阶段、压力快速下降阶段和压力低位运行阶段;降黏剂驱可以降低稠油启动压力梯度,减小驱替压力,实施降黏剂驱后采收率提高了12.4%,总采收率达到46.6%;降黏剂驱提高采收率的主要机理是降低原油黏度,减少残余油饱和度;采用非线性混合规则表征了原油黏度随降黏剂浓度的非线性变化规律,该表征方法可以应用于数值模拟计算,计算结果和实验值拟合得较好;先导试验表明该技术能够降低水井注入压力,降水增油效果显著,试验区内油井全面见效。To realize the conversion from thermal recovery to viscosity reducer flooding for ordinary heavy oil,the performance of viscosity reducer we evaluated,and the injection characteristics and oil displacement performance were studied through core oil displacement experiments.Afterward,the mechanism of oil recovery improvement by viscosity reducer flooding was studied in microscopic visualization experiments.As last,the nonlinear mixing law was used to realize the function of viscosity flooding in reservoir numerical simulation,and history match between indoor physical experiment results and numerical simulation was conducted.Results show that the process of viscous oil viscosity reducer flooding could form a stable oil-in-water emulsion.The process of water flooding could be divided into three stages,ie,starting pressure breakthrough stage,pressure rapid decline stage,and low-pressure operation stage.Viscosity reducer flooding could reduce the starting pressure gradient and the displacement pressure,the oil recovery factor was increased by 12.4%using viscosity reducer flooding,and the total recovery reached 46.6%.The main mechanism of improving oil recovery by viscosity reducer is to reduce crude oil viscosity and residual oil saturation.By using the nonlinear mixing rule,the variation rule of crude oil viscosity with viscosity reducer concentration was obtained,which can be applied for numerical simulation directly.The pilot test shows that the water cut was decreased and oil production was increased obviously,which reduced the injection pressure of the well and made all the oil producers effective.

关 键 词：稠油 降黏剂驱 物理模拟 数值模拟 矿场应用 

分 类 号：TE357[石油与天然气工程—油气田开发工程]