多孔介质中孔喉级别乳状液的形成条件及黏弹性  

The formation and viscoelasticity of pore-throat scale emulsion in porous media

作　　者：周亚洲[1] 王德民[2] 王志鹏[3] 曹睿[3] 

机构地区：[1]东北石油大学石油工程学院,黑龙江大庆163318 [2]大庆油田有限责任公司,黑龙江大庆163000 [3]大庆油田有限责任公司第五采油厂试验大队,黑龙江大庆163000

出　　处：《石油勘探与开发》2017年第1期110-116,共7页Petroleum Exploration and Development

基　　金：国家自然科学基金(51474071)

摘　　要：采用岩心驱替实验模拟油藏中原油乳化过程,通过可视岩心驱替实验研究乳状液形成机理,分析不同运移距离、乳化剂浓度和注入速度下形成乳状液的粒径分布及孔喉级别乳状液形成条件,通过测量形成的乳状液黏度、储能模量和耗能模量,研究乳状液的黏弹性。研究表明:多孔介质中乳状液形成机理主要为残余油卡断作用和乳化剂溶液的剪切作用。当运移距离大于1/3倍注采井距、乳化剂浓度为0.4%~0.5%、注入速度为0.3~0.4 m L/min时,能够形成稳定性较好的孔喉级别乳状液。当乳化剂浓度为0.4%和0.5%、剪切速度为7.34 s-1时,乳状液黏度可达48.6~70.3 m Pa·s。随着乳化剂浓度的增加,乳状液的储能模量和耗能模量增大,乳状液黏弹性增强。The emulsion process in reservoirs was simulated by core displacement experiment, and the formation mechanisms of emulsion were studied by visualization core displacement experiment. The particle size distribution of formed emulsion at different transport distances, emulsifier concentration or injection rates and the condition of forming stable emulsion of pore-throat scale were analyzed. By measuring the viscosity, the storage modulus and the elastic modulus of the formed emulsion, viscoelasticity of emulsion was studied. The study shows that the formation mechanisms are mainly the snaping action of residual oil and the shearing action of emulsifier solution. When the migration distance is greater than 1/3 times the injector-producer spacing, the emulsifier concentration is between 0.4% and 0.5% and the injection rate is between 0.3 mL/min and 0.4 mL/min, the pore-throat scale emulsion with favorably stability can be formed. The viscosity is between 48.6 mPa.s and 70.3 mPa·s when the shear rate is 7.34 s-1 and the emulsifier concentration is between 0.4% and 0.5%. The storage modulus and loss modulus of emulsion increase with the emulsifier concentration increasing, and the viscoelasticity of emulsion is enhanced.

关 键 词：提高采收率 乳化剂 乳状液 形成条件 粒径 黏弹性 

分 类 号：TE357.4[石油与天然气工程—油气田开发工程]