低渗透油藏中相微乳液驱油体系筛选  

Screening of middle-phase microemulsion flooding system in low permeability reservoir

作　　者：吴天江[1,2] 吕伟[1,2] 李丛妮 赵燕红 WU Tian-jiang;L Wei;LI Cong-ni;ZHAO Yan-hong(Oil and Gas Technology Research Institute,CNPC Changqing Oilfield Company,Xi’an 710018,China;National Engineering Laboratory of Low Permeability Oil and Gas Field Exploratory and Development,Xi’an 710018,China;Shaanxi Chemical Industry Research Institute Co.,Ltd.,Xi’an 710054,China;Research Institute of Xi’an Changqing Chemical Group Company Limited,Xi’an 710018,China)

机构地区：[1]长庆油田分公司油气工艺研究院,陕西西安710018 [2]低渗透油气田勘探开发国家工程实验室,陕西西安710018 [3]陕西化工研究院有限公司,陕西西安710054 [4]西安长庆化工集团有限公司研究所,陕西西安710018

出　　处：《应用化工》2023年第9期2551-2555,共5页Applied Chemical Industry

基　　金：国家科技重大专项课题(2017ZX05013-005)。

摘　　要：中相微乳液优异的增溶能力使其成为大幅提高原油采收率技术研究的热点。立足长庆五里湾低渗透油藏特点,以十二烷基苯磺酸钠与椰油脂肪酸脂聚氧乙烯甜菜碱质量比1∶3的复配体系作为中相微乳液主表面活性剂,选择正丁醇作为助表面活性剂,利用鱼状相图确定形成中相微乳液所需的醇浓度区间为1.3%~3.7%,对应表面活性剂质量浓度为0.3%~0.7%。微乳液开始形成中相和中相消失对应的盐度分别为1.5%,6.0%,形成中相微乳液的盐宽为4.5%。NaCl质量浓度为4.8%左右时增溶效果最佳,界面张力达到10-3mN/m超低水平。填砂模型微乳液驱实验提高驱油效率23.25%。Middle-phase microemulsion flooding system becomes a hot spot in the research of greatly enhanced oil recovery technology owing to its excellent solubilization ability.Based on the characteristics of Changqing Wuliwan low-permeability reservoir,the mixed system of sodium dodecylbenzene sulfonate and coconut fatty acid polyoxyethylene betaine with a mass ratio of 1∶3 is used as the main surfactant of middle-phase microemulsion,n-butanol is selected as the cosurfactant,and the range of alcohol concentration required to form middle-phase microemulsion is 1.3%~3.7%according to the fishlike phase diagram,and the corresponding surfactant mass concentration is 0.3%~0.7%.The salinity ranges corresponding to the formation of middle phase and disappearance of middle phase in microemulsion are 1.5%and 6.0%,and the salt width of forming middle phase microemulsion is 4.5%.When the mass concentration of NaCl is about 4.8%,the solubilization effect is the best,and the interfacial tension reaches an ultra-low level of 10-3 mN/m.Sand filling model microemulsion flooding experiment improves oil displacement efficiency by 23.25%.

关 键 词：中相微乳液 增溶 超低界面张力 相行为 低渗油藏 

分 类 号：TQ07[化学工程] TE357.46[石油与天然气工程—油气田开发工程]