改性纳米二氧化钛的合成及其在低渗透油藏中的应用OA
Synthesis of modified nano-TiO2 and its application in low-permeability reservoirs
针对低渗透油藏注入压力高、注水开发效果差等问题,以纳米TiO2 为基体,通过 3-巯丙基三甲氧基硅烷与正辛基三乙氧基硅烷的二次接枝反应,制备出具有类表面活性剂特性的改性双亲性纳米TiO2(OMNS),并采用FTIR、元素分析、TEM、粒径分析等方法对其结构进行表征,评价了它的分散稳定性、界面张力、岩心润湿性及降压增注性能.实验结果表明,OMNS通过磺酸基团与辛基长链实现了静电排斥-空间位阻的协同效应,分散稳定性显著优于未改性纳米TiO2;在质量浓度300 mg/L下可有效降低油水界面张力并实现润湿性反转;注入0.6 PV OMNS流体后,二次水驱降压率达13.58%,在低渗透油藏降压增注方面具有一定应用潜力.
To address high injection pressure and poor waterflooding performance in low-permeability reservoirs,the modified amphiphilic nano-TiO2(OMNS)with surfactant-like properties was prepared through secondary grafting of 3-mercaptopropyltrimethoxysilane and n-octyltriethoxysilane onto a nano-TiO2 substrate.The structure of OMNS was characterized by FTIR,elemental analysis,TEM,and particle size analysis.Its dispersion stability,interfacial tension,core wettability,and pressure reduction and injection enhancement performance were evaluated.Experimental results demonstrate that OMNS achieves dual stabilization through electrostatic repulsion and steric hindrance,arising from the sulfonic acid groups and long octyl chains.Compared with unmodified nano-TiO2,OMNS exhibits significantly enhanced dispersion stability.At a mass concentration of 300 mg/L,it effectively reduces the oil-water interfacial tension and achieves wettability reversal.Following the injection of 0.6 PV of OMNS fluid,the pressure reduction rate during secondary waterflooding reaches 13.58%,which exhibits certain application potential in pressure reduction and injection enhancement for low-permeability reservoirs.
汪洺宇;陈洪;刘继成;海漫
西南石油大学 石油与天然气工程学院 油气藏地质及开发工程全国重点实验室,四川 成都 610000西南石油大学 石油与天然气工程学院 油气藏地质及开发工程全国重点实验室,四川 成都 610000西南石油大学 石油与天然气工程学院 油气藏地质及开发工程全国重点实验室,四川 成都 610000西南石油大学 石油与天然气工程学院 油气藏地质及开发工程全国重点实验室,四川 成都 610000
化学化工
低渗透油藏双亲性纳米二氧化钛润湿反转降压增注
low-permeability reservoiramphiphilic nano-TiO2wettability reversalpressure reduction and injection enhancement
《石油化工》 2026 (3)
372-379,8
国家自然科学基金项目(51674210).
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