石油磺酸盐驱油体系中相微乳液提高采收率  

Recovery enhancement by medium-phase microemulsion in petroleum sulfonate oil displacement system

作　　者：关丹 唐文洁 阙庭丽 帕提古丽·麦麦提 栾和鑫 GUAN Dan;TANG Wenjie;QUE Tingli;Patiguli·Maimaiti;LUAN Huoxin(Xinjiang Oilfield Branch Company,Research Institute of Exploration and Detection,CNPC,Karamay 834000,China;Key Laboratory of Conglomerate Reservoir Exploration and Development,CNPC,Karamay 834000,China;Xinjiang Laboratory of Petroleum Reserve in Conglomerate,Karamay 834000,China)

机构地区：[1]中国石油新疆油田分公司实验检测研究院,新疆克拉玛依834000 [2]中国石油砾岩油气藏勘探开发重点实验室,新疆克拉玛依834000 [3]新疆砾岩油藏实验室,新疆克拉玛依834000

出　　处：《石油化工》2025年第2期233-239,共7页Petrochemical Technology

基　　金：油气新能源公司攻关型应用性科技专项基金项目(2023ZZ22)。

摘　　要：在表面活性剂含量为0.5%(w)的条件下,通过调整石油磺酸盐与十二醇聚氧丙烯硫酸钠复配比例及盐含量以形成中相微乳液驱油体系。采用表面张力仪测定了表面活性剂的表面张力,通过表面张力与浓度的关系曲线确定了临界胶束浓度;通过岩心驱替实验测定了中相微乳液驱油体系的驱油效率,并与微流控驱油实验进行对比。实验结果表明,NaCl含量为4.9%(w)、石油磺酸盐与十二醇聚氧丙烯硫酸钠质量比为2∶1时,形成的中相微乳液驱油体系界面张力最低(3.12×10^(-4) mN/m);中相微乳液驱油体系中加入聚合物后,岩心驱替实验驱油效率为46.41%,高于未加入聚合物的中相微乳液驱油体系(22.3%);微流控驱油实验结果进一步表明,聚合物使驱替液具有较大黏度,易缠结在孔隙中增大高渗透率层段的流动阻力,使驱替液在高、低渗透率层段流动速率差减小,同时聚合物的黏弹性可携带孔隙边缘处的油以及使孔隙壁上的油膜变薄,进而提高驱油效率。With the surfactant content of 0.5%(w),the medium-phase microemulsion oil displacement system was formed by adjusting the compound ratio and salt concentration of petroleum sulfonate and sodium dodecyl polyoxypropylene sulfate.The surface tension of surfactants was measured by surface tension meter.The critical micelle concentration was determined by the relationship curve between surface tension and concentration.The oil displacement efficiency after the formation of mesophase microemulsion was measured by core displacement experiment and compared with the microfluidic experiment.According to the experimental results,when the mass concentration of NaCl is 4.9%(w)and the mass ratio of petroleum sulfonate to sodium dodecanol polyoxypropylene sulfate is 2∶1,the interfacial tension reaches the lowest(2.61×10^(-4) mN/m).The oil displacement efficiency of the core flooding experiment is 46.41%after adding polymer into the medium-phase microemulsion oil displacement system,higher than that of single medium-phase microemulsion oil displacement(22.3%).Microfluidic experiments further show that the addition of polymers increases the viscosity of the displacement fluid,making it easier to entangle in the pores and increase the flow resistance of high permeability layers.Therefore,the flow velocity difference of the displacement fluid in high and low permeability layers is reduced.At the same time,the viscoelasticity of polymers can carry oil at the edges of pores and thin the oil film on the pore walls,thereby improving oil displacement efficiency.

关 键 词：石油磺酸盐 中相微乳液 驱油效率 微流控 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]