新疆九7区超稠油组成结构研究*

Research on Composition of Xinjiang Block Nine 7 Ultra Heavy Oil Using B-L Method

丁万成 贺丽鹏 耿向飞 丁彬 罗健辉 王平美 江莉

DINGWancheng HE Lipeng GENG Xiangfei DING Bin LUO Jianhui WANG Pingmei JIANG Li

为解析新疆九7区超稠油化学结构、揭示超稠油黏度的形成机理，将新疆九7区超稠油进行组分分离后得到了饱和份、芳香份、轻胶质、中胶质、重胶质、沥青质六个组分，借助相对分子质量测定与元素分析等手段对各组分进行了分析，采用以核磁共振氢谱为基础的改进B-L法计算得到了稠油各组分结构参数。化学结构模型采用稠环芳烃连接环烷烃和烷基侧链并含杂原子结构单元来表示。计算出的分子模型显示各组分在结构上存在明显差异，其中沥青质与重胶质结构单元复杂，稠环芳烃与环烷烃含量较多，其他组分结构单元相对简单。计算出的各组分相对分子质量的计算值与实测值接近，相对误差小于3%，表明采用改进的B-L 法构建出的各组分平均分子结构是合理的。胶质分子、沥青质分子与芳烃分子相互之间存在强烈的缔合作用，构成大分子聚集体结构，最终形成新疆九7区超稠油的高黏特性。图5 表5 参14

In order to analyze the molecular structure of sub-fractions of the ultra heavy oil and further investigate the high viscosity mechanism of the ultra heavy oil，Xinjiang block nine 7 ultra heavy oil was separated into different fractions which were saturate，aromatic，resin，and n-C 7 insoluble asphaltene．The fundamental properties of each fraction were measured by VPO and elemental analyzer，and the average structural parameters of different fractions were analyzed based on 1H-NMR determination using B-L method. Model molecular structure of different fractions was obtained based on average structural parameters. The structure of the model molecular was represented by aromatic ring connected with aliphatic ring along with alkyl side chains and hetero-atom. The model molecular showed that the structure of asphaltene and heavy glial was complex，while the structure of other fractions was relatively simple. Moreover，the simulation value and experimental value of molecular weight was close and the relative error was less than 3%，which indicated that the model molecular structure constructed by B-L method was reasonable. There was strong association action between resin，asphaltene and aromatic，resulting in forming Macromolecular aggregation structure，and achieving the high viscosity characreristic of the Xinjiang block nine 7 ultra heavy oil .

10.19346/j.cnki.1000-4092.2016.03.028