纳米颗粒F-SiO_(2)对地层原油中沥青质沉淀抑制效果  

Inhibition effect of F-SiO_(2) nanoparticles on asphaltene precipitation in strata oil

作　　者：张旭 张瑞 马若楠 吴晓旭 李希娟 广怡初 ZHANG Xu;ZHANG Rui;MA Ruonan;WU Xiaoxu;LI Xijuan;GUANG Yichu(Laojunmiao Oil Production Company of PetroChina Yumen Oilfield Company,Jiuquan 735000,China;Science and Technology Information and Foreign Cooperation Division of PetroChina Yumen Oilfield Company,Jiuquan 735000,China)

机构地区：[1]中国石油玉门油田公司老君庙采油厂,甘肃酒泉735000 [2]中国石油玉门油田公司科技信息与对外合作处,甘肃酒泉735000

出　　处：《大庆石油地质与开发》2023年第6期91-98,共8页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家重点研发计划“CO_(2)驱油技术及地质封存安全监测”(2018YFB0605500)。

摘　　要：为明确纳米颗粒对原油中沥青质沉淀的抑制效果及吸附沥青质机理,采用X射线衍射、傅里叶变换红外光谱、场发射扫描电子显微镜和低温氮气吸附实验方法,开展了沥青质起始沉淀点测定实验和沥青质溶解线及沉淀线测定实验,研究了改性F-SiO_(2)纳米颗粒作用下的沥青质起始沉淀点、吸附量及亚稳定区宽度的变化。结果表明:纳米颗粒对轻质油中沥青质的吸附以单层为主,最大吸附量为0.8 g/g,而对重质油中沥青质的吸附以多层和大颗粒沥青质聚集体(10~50μm)为主,最大吸附量可达8.6 g/g;F-SiO_(2)纳米颗粒增大了沥青质的亚稳定区,推迟了沥青质自发成核的形成时间,延迟了沥青质起始沉淀点,抑制了沥青质沉淀;F-SiO_(2)纳米颗粒作用下的重质油沥青质的燃烧残余物质量分数为11.6%,优于轻质油沥青质(52.8%),证明F-SiO_(2)纳米颗粒对重质油中沥青质的吸附及抑制效果好于轻质油。研究成果为预防沥青质沉淀、缓解沉积伤害提供了理论依据。In order to clarify the inhibition effect of nanoparticles on asphaltene precipitation in oil and the mechanism of asphaltene adsorption,measurement experiment of asphaltene initial precipitation point and measurement experiment of asphaltene dissolution line and precipitation line are carried out by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),field emission scanning electron microscopy(FESEM)and low-temperature nitrogen adsorption.Variation of asphaltene initial precipitation point,adsorption amount and metastable zone width effected by modified SiO_(2) nanoparticles are studied.The results show that asphaltene adsorption of nanoparticles in light oil is mainly in single-layer,with maximum adsorption of 0.8 g/g,while asphaltene adsorption in heavy oil mainly presents multi-layered and large-particle asphaltene aggregates(10~50μm),with maximum adsorption of 8.6 g/g.F-SiO_(2) nanoparticles enlarge asphaltene metastable zone and delay formation time of spontaneous nucleation of asphaltene,as well as initial precipitation point of asphaltene and inhibit asphaltene precipitation.Mass fraction of asphaltene combustion residue in heavy oil effected by F-SiO_(2) nanoparticles is 11.6%,which is better than that of asphaltene in light oil(52.8%)and proves F-SiO_(2) nanoparticles’better adsorption and inhibition on asphaltene in heavy oil than in light oil.The research provides theoretical evidence for preventing asphaltene precipitation and mitigating deposition damage.

关 键 词：纳米颗粒 沥青质 沉淀 吸附 亚稳定区 

分 类 号：TE348[石油与天然气工程—油气田开发工程]