温敏型纳米复合材料的研制及驱油性能研究  

Preparation of temperature-sensitive nanocomposite and study on its oil displacement performance

作　　者：陈思齐 郑学成[1,2] 樊维 林小莎 周雪峰 CHEN Si-qi;ZHENG Xue-cheng;FAN Wei;LIN Xiao-sha;ZHOU Xue-feng(College of Chemistry&Chemical Engineering,Southwest Petroleum University,Chengdu 610500,China;Sichuan Provincial Key Laboratory of Oil&Gas Field Applied Chemistry,Southwest Petroleum University,Chengdu 610500,China;Nanchong Electronic Information Industry Technology Institute,Nanchong 637131,China)

机构地区：[1]西南石油大学化学化工学院,四川成都610500 [2]西南石油大学油气田应用化学四川省重点实验室,四川成都610500 [3]南充电子信息产业技术研究院,四川南充637131

出　　处：《现代化工》2024年第7期186-192,共7页Modern Chemical Industry

基　　金：南充市科技计划项目(23YYJCYJ0035)。

摘　　要：为提高纳米流体驱对油藏的适用性,满足高效开采的需求,设计了一种对温度能动态响应的纳米材料。将温敏性单体异丙基丙烯酰胺(NIPAm)和亲水单体衣康酸(IA)接枝在纳米SiO_(2)表面制备了温敏型纳米复合材料NIPAm/IA/SiO_(2)。通过红外光谱、动态光扫射等表征手段研究了NIPAm/IA/SiO_(2)的化学结构、热稳定性、形貌及粒径。结果表明,NIPAm/IA/SiO_(2)具有良好的分散性和热稳定性(初始分解温度为310℃),中值粒径为264 nm。当环境温度低于低临界溶液温度(LCST)时,NIPAm/IA/SiO_(2)呈现亲水性。温敏型纳米流体的润湿作用使岩石表面亲水性增强、毛细管力增大,NIPAm/IA/SiO_(2)提高采收率主要是通过渗吸作用完成;当温度高于LCST时,NIPAm/IA/SiO_(2)呈现两亲性,此时岩石表面趋于中性润湿,从而提高了油水两相的流动性,使孔喉中的油更容易被注入流体驱替。In order to improve the applicability of nano-fluid flooding to reservoir and meet the demand of efficient production,a kind of nanomaterial with dynamic response to temperature is designed.NIPAm/IA/SiO_(2),a temperature-sensitive nanocomposite,is prepared through grafting N-isopropylacrylamide(NIPAm)and itaconic acid(IA)onto the surface of nano-SiO_(2).The chemical structure,thermal stability,morphology and particle size of NIPAm/IA/SiO_(2) are studied by means of infrared spectroscopy,dynamic light strafing and etc.It is indicated by the results that NIPAm/IA/SiO_(2) has good dispersion performance and thermal stability(initial decomposition temperature of 310℃),and its median particle size is 264 nm.NIPAm/IA/SiO_(2) shows hydrophilic property when the ambient temperature is lower than the low critical solution temperature(LCST).The wetting effect of temperature-sensitive nanofluid enhances the hydrophilicity of the rock surface and increases the capillary force,therefore NIPAm/IA/SiO_(2) improves the recovery efficiency mainly through imbibition.NIPAm/IA/SiO_(2) shows amphiphilicity when the temperature exceeds LCST.Under this condition,the rock surface tends to be neutral wetting,which increases the fluidity of the oil-water two phases,and makes the oil in the pore throat easier be injected into the fluid to displace.

关 键 词：温度响应 纳米复合材料 提高采收率 地层温度 低临界溶液温度 

分 类 号：TE34[石油与天然气工程—油气田开发工程]