普通稠油启动压力梯度表征及物理模拟方法  

THE METHOD OF CHARACTERIZATION AND PHYSICAL SIMULATION OF TPG FOR ORDINARY HEAVY OIL

作　　者：田冀 许家峰 程林松[2] 

机构地区：[1]中海石油研究中心,北京100027 [2]中国石油大学石油天然气工程学院,北京昌平102249

出　　处：《西南石油大学学报（自然科学版）》2009年第3期158-162,共5页Journal of Southwest Petroleum University(Science & Technology Edition)

基　　金：国家973项目(2005CB22130004)

摘　　要：基于管流模型及流变原理,分别设计了5种不同黏度原油实验方案,得到了管径1mm条件下原油黏度340～44500mPa·s范围内启动压力梯度随黏度变化关系,从宏观上验证了普通稠油存在启动压力梯度,同时在此基础上设计了考虑微观孔喉结构的填砂管模型,其中填砂管气测渗透率为(186.4～6698.0)×10-3μm2,原油黏度为10～450mPa·s,实验结果表明:在相同气测渗透率条件下原油黏度越小启动压力梯度越小,且两者呈较好的线性关系;在相同原油黏度条件下,开始随着气测渗透率的增加启动压力梯度迅速减小,当渗透率高于600×10-3μm2左右时,启动压力梯度随渗透率增加而减小的幅度趋于平缓;初始条件下随着流度的增加启动压力梯度迅速降低,当流度K/μ突破25μm2/Pa·s后,随着流度的进一步增加,启动压力梯度降低速度趋于平缓,且二者呈幂函数关系。Based on the pipe flow model and rheological principle,the experiment programme about five different viscosity is designed,and the relationship between threshold pressure gradient and viscosity under the condition of diameter 1mm and the viscosity 340 to 44500mPa·s is acquired,which demonstrates the TPG macroscopically.Meanwhile,the sand packed model,with the permeability about 186.4 to 6698.0×10-3μm2,and the viscosity about 10 to 450mPa·s,considering the microcosmic structure of pore and throat,is designed.The result shows that firstly,the lower the viscosity is,the smaller the TPG will be under the condition of the same gas permeability,secondly,with the same viscosity,initially the TPG decreases sharply as the increasing of gas permeability,but when the permeability exceeds 600×10-3μm2,the increasing velocity slows down gradually.And the last,initially the TPG decreases sharply as the increasing of mobility but when it exceeds 25μm2/Pa·s,the speed slows down gradually,while the relationship shows power function.

关 键 词：普通稠油 启动压力梯度 物理模拟 填砂管模型 流变原理 

分 类 号：TE345[石油与天然气工程—油气田开发工程]