伊拉克H油田原油沥青质沉积趋势预测及分析  

Prediction and Analysis of Asphaltene Deposition Trend in Iraq H Oilfield

作　　者：曹松 杜政学[2] 吴仲岿[1] 殷俊 汪绍金 CAO Song;DU Zheng-xue;WU Zhong-kui;YIN Jun;WANG Shao-jin(School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;Research Institute of Petroleum Exploration and Development,Beijing 100083,China))

机构地区：[1]武汉理工大学材料科学与工程学院,武汉430070 [2]中国石油勘探开发研究院,北京100083

出　　处：《科学技术与工程》2018年第33期36-40,共5页Science Technology and Engineering

基　　金：国家自然科学基金(50973087;51173141)资助

摘　　要：为了研究伊拉克H油田沥青质的沉积趋势,对伊拉克H油田三种不同油藏原油进行四组分分离,利用胶体体系稳定性定量计算方法预测了沥青质的沉积趋势;并采用元素分析、红外光谱(FTIR)、凝胶渗透色谱(GPC)、核磁共振(1H-NMR)等分析手段对其沥青质分子结构进行了表征,探索了沥青质分子结构与沉积趋势的内在联系。研究结果表明:伊拉克H油田原油沥青质有沉积的趋势,且样品A胶体不稳定指数较大,其沥青质较容易沉积。三种沥青质的结构参数存在差异,相对分子质量、芳香度和芳香缩合度从样品A沥青质、样品B沥青质、样品C沥青质依次减少,而氢碳比(H/C比)依次增大。沥青质聚集体的稳定性与沥青质分子结构特征密切相关,H/C比值较低以及相对分子质量、芳香度、芳香缩合度较高的样品A沥青质具有更大的稳定能,其沥青质沉淀的可能性也较大。In order to study the trend of asphaltene deposition in Iraq H Oilfield,three kinds of crude oils were separated into four components,the trend of asphaltene deposition was predicted by colloidal instability index,and the molecular structure of the asphaltenes were characterized by elemental analysis,Fourier transform infrared spectrometer(FTIR),gel permeation chromatography(GPC)and nuclear magnetic resonance spectroscopy(1H-NMR).The results indicate that asphaltenes have a tendency to deposit in Iraq H Oilfield.And the greater colloidal instability index,the more prone to asphaltene deposition.The structural parameters of the asphaltenes are different,asphaltene of the sample A contains more aromatic nucleus and more branched alkanes,asphaltene of sample B has the lowest number of branched alkanes,asphaltene of sample C has the lowest number of aromatic nucleus.The molecular weight,aromaticity and aromatic condensation degree decrease in turn,and hydrogen-to-carbon ratio increases.The stability of aggregates is closely related to the molecular structure of asphaltene,the stability of the aggregates increases with lower hydrogen-to-carbon ratio,higher molecular weight,higher aromaticity,and higher aromatic condensation degree,in addition,a greater stability of the aggregates produces a greater tendency toward precipitation.

关 键 词：沥青质 结构 沉积 稳定性 

分 类 号：TE624[石油与天然气工程—油气加工工程]