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
陈思齐 1郑学成 2樊维 1林小莎 3周雪峰1
作者信息
- 1. 西南石油大学化学化工学院,四川 成都 610500
- 2. 西南石油大学化学化工学院,四川 成都 610500;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
- 折叠
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SiO2 表面制备了温敏型纳米复合材料NIPAm/IA/SiO2.通过红外光谱、动态光扫射等表征手段研究了NIPAm/IA/SiO2 的化学结构、热稳定性、形貌及粒径.结果表明,NIPAm/IA/SiO2 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/SiO2 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/SiO2 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/SiO2 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.
Abstract
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/SiO2,a temperature-sensitive nanocomposite,is prepared through grafting N-isopropylacrylamide(NIPAm)and itaconic acid(IA)onto the surface of nano-SiO2.The chemical structure,thermal stability,morphology and particle size of NIPAm/IA/SiO2 are studied by means of infrared spectroscopy,dynamic light strafing and etc.It is indicated by the results that NIPAm/IA/SiO2 has good dispersion performance and thermal stability(initial decomposition temperature of 310℃),and its median particle size is 264 nm.NIPAm/IA/SiO2 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/SiO2 improves the recovery efficiency mainly through imbibition.NIPAm/IA/SiO2 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Key words
temperature responsiveness/nanocomposite/enhanced oil recovery/formation temperature/low critical solution temperature引用本文复制引用
基金项目
南充市科技计划项目(23YYJCYJ0035)
出版年
2024
NETL
NSTL
万方数据