多孔介质中孔喉级别乳状液的形成条件及黏弹性

发布时间：2018-06-07 23:20

本文选题：提高采收率 + 乳化剂　；参考：《石油勘探与开发》2017年01期

【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。
[Abstract]:The oil emulsification process in oil reservoir was simulated by core displacement experiment. The formation mechanism of emulsion was studied by visual core displacement experiment, and different migration distances were analyzed. The viscoelasticity of emulsion was studied by measuring the viscosity, energy storage modulus and energy dissipation modulus of the emulsion under the conditions of particle size distribution and pore throat grade emulsion formation under the emulsifier concentration and injection rate. The results show that the formation mechanism of emulsion in porous media is mainly the residual oil entrapment and the shear effect of emulsifier solution. When the migration distance is greater than 1 / 3 times the injection-production distance, the emulsifier concentration is 0.4 and 0.5 and the injection rate is 0.3 mm / L / min, a stable emulsion of pore throat grade can be formed. When the emulsifier concentration is 0.4%, the shear rate is 7.34 s ~ (-1), the viscosity of the emulsion is 48.6 ~ 70.3 MPA 路s ~ (-1). With the increase of emulsifier concentration, the storage modulus and energy dissipation modulus of emulsion increased, and the viscoelasticity of emulsion increased.
【作者单位】：东北石油大学石油工程学院;大庆油田有限责任公司;大庆油田有限责任公司第五采油厂试验大队;
【基金】：国家自然科学基金(51474071)
【分类号】：TE357

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