两性离子表面活性剂和纳米颗粒为起泡剂的高稳定性超临界二氧化碳泡沫封窜体系  

Highly Stable Supercritical CO_(2) Foam with Zwitterionic Surfactant and Nanoparticle as Foaming Agents for Channeling Blocking

作　　者：李伟涛 李宗阳[1,2] 张东 张传宝 李友全 LI Weitao;LI Zongyang;ZHANG Dong;ZHANG Chuanbao;LI Youquan(Research Institute Exploration and Development,Shengli Oilfield Company,Sinopec,Dongying,Shandong 257015,P R of China;Shandong Province Key Laboratory of Carbon Capture,Utilization and Storage,Dongying,Shandong 257015,P R of China;Post-Doctoral Research Center,Shengli Oilfield Company,Sinopec,Dongying,Shandong 257015,P R of China)

机构地区：[1]中国石化胜利油田分公司勘探开发研究院,山东东营257015 [2]山东省碳捕集利用与封存重点实验室(筹),山东东营257015 [3]中国石化胜利油田分公司博士后科研工作站,山东东营257015

出　　处：《油田化学》2024年第1期101-107,共7页Oilfield Chemistry

基　　金：国家重点研发计划“区域二氧化碳捕集与封存关键技术研发与示范”(项目编号SQ2022YFE020862);东营市自然科学基金“咸水层CO_(2)运移与封存机理研究”(项目编号2023ZR010);中国石化气驱提高采收率重点实验室课题“高稳定性N2泡沫调驱体系提高采收率机理研究”(项目编号KL22008)。

摘　　要：胜利油田低渗透油藏具有埋藏深(>3000 m)、温度高(>120℃)、非均质性强等特点,针对低渗透油藏CO_(2)驱波及效率低、常规泡沫高温调驱性能变差等问题,构建了由两性离子表面活性剂(HSD)和改性SiO_(2)纳米颗粒为起泡剂的高稳定性超临界CO_(2)泡沫体系。研究了该体系在高温下的起泡性能和耐温性能;分别评价了纳米SiO_(2)对超临界CO_(2)泡沫体系流变特性、封堵特性以及调驱性能的影响;最后探讨了纳米颗粒强化超临界CO_(2)泡沫的稳定机理。结果表明,高稳定性超临界CO_(2)泡沫体系表现出良好的起泡性能和耐高温特性,随着体系中纳米颗粒浓度的增加,泡沫半衰期先增加后降低。在110℃下,0.5%的纳米颗粒可使泡沫析液半衰期由17 min提高到40 min,稳定性提高了近1.5倍。在相同的剪切速率下,体系的表观黏度随纳米颗粒浓度的增加而增加,稠度系数由0.073增至1.220。在岩心封堵实验中,泡沫在多孔介质中的稳态表观黏度随纳米颗粒浓度的增加而增加,封堵强度逐渐增强;超临界CO_(2)泡沫呈“颗粒状”堆叠排放,泡沫直径为10~20μm。超临界CO_(2)泡沫具有较好的调驱性能,能封堵高渗透通道,迫使后续注入的CO_(2)进入低渗透基质中,从而提高采收率。表面活性剂分子吸附在纳米SiO_(2)表面使其具有了界面活性,进而纳米SiO_(2)吸附到气液界面上,提高了泡沫稳定性。Low permeability reservoirs in Shengli oilfield are characterized with deep burial depth(>3000 m),high temperature(>120℃),and strong heterogeneity.Aiming at the problems of low sweep efficiency of CO_(2) flooding and poor profile control performance of conventional foam,a highly stable supercritical CO_(2) foam system with zwitterionic surfactant(HSD)and modified SiO_(2) nanoparticles as foaming agents was developed.The foaming performance and temperature resistance of the system at high temperature were studied.The effects of nano-SiO_(2) on the rheological properties,plugging properties and profile control performance of supercritical CO_(2) foam system were evaluated respectively.Finally,the stabilization mechanism of nanoparticle reinforced supercritical CO_(2) foam was discussed.The results showed that the highly stable supercritical CO_(2) foam system had good foaming performance and temperature resistance.With increasing dosage of nanoparticle in the system,the half-life of foam gradually increased first and then decreased.At 110℃,0.5%nanoparticle could increase the half-life of foam drainage from 17 min to 40 min,and then the stability was improved by nearly 2.5 times.At the same shearing rate,the apparent viscosity of the system increased with the increase of nanoparticle concentration,and then the consistency coefficient increased from 0.073 to 1.220.In the core flooding experiment,the steady-state apparent viscosity of foam in porous media increased with the increase of nanoparticle concentration,thereby increasing the plugging strength.Supercritical CO_(2) foam was stacked and discharged in“granular”shape.The foam size was 10—20μm.Supercritical CO_(2) foam had good profile control and displacement performance,which could block high permeability channels and compel subsequent injected CO_(2) into low permeability matrix,thus improving oil recovery.Surfactant molecules adsorbed on the surface of nano-SiO_(2),which made it have interfacial activity,and then nano-SiO_(2) adsorbed on the gas-liq

关 键 词：超临界二氧化碳泡沫 纳米颗粒 界面吸附 稳定性 调驱 

分 类 号：TE357[石油与天然气工程—油气田开发工程]