热重分析仪求取稠油高温氧化动力学参数  

Determination on high-temperature oxidation kinetic parameters of heavy oils with thermogravimetric analyzer

作　　者：唐君实[1] 关文龙[1] 梁金中[1] 江航[1] 王伯军[1] 

机构地区：[1]中国石油勘探开发研究院提高石油采收率国家重点实验室,北京100083

出　　处：《石油学报》2013年第4期775-779,共5页Acta Petrolei Sinica

基　　金：国家重大科技专项"火烧驱油技术研究与应用"(2011ZX05012-002)资助

摘　　要：采用火烧油层技术开发稠油时,高温氧化反应是火烧前缘的主要反应类型和能量源。采用热重法对稠油高温氧化过程进行研究,评价了样品制备方法(纯油样或混合SiO2)和动力学参数求取方法(Coats-Redfern积分法、ABSW微分法和FWO等转化率法)对动力学参数测试结果的影响。研究结果表明,油样混合SiO2后,颗粒间的孔隙可以为氧气扩散提供通道,使样品均匀反应,实现有效动力学实验,克服了纯油样不易均匀燃烧的问题;通过热重曲线求取稠油高温氧化动力学参数时,单一扫描速率法(CoatsRedfern积分法和ABSW微分法)拟合动力学数据存在一定偏差,而FWO等转化率法避免了因简化和假设机理函数所带来的误差,可用于油焦燃烧本征动力学研究,为火烧油层开发稠油、超稠油和特稠油提供准确动力学参数。High temperature oxidation is the main reaction type and energy source of the combustion front during in-situ combustion development of heavy oils. High temperature oxidation of heavy oils was studied by thermogravimetry, and influences of sample preparation methods （pure oils or oils mixed with SiO2） and kinetic parameter determination methods （Coats-Redfern integration, ABSW differentiation and FWO iso-conversion） on measured results of kinetic parameters were evaluated. The results showed that the combustion of pure oil samples is uneven, while for oils mixed with SiO2, pore spaces among SiO2 particles can provide 02 with diffusion channels, resulting in an even reaction in combustion. Therefore, the kinetic analysis experiment is effective due to the even combustion of samples. When kinetic parameters for high temperature oxidation of heavy oils are derived from thermogravimetric curves, there exist certain errors in kinetic parameters fitted by a single scanning-rate method （Coats-Rediern integration and ABSW differentiation）. Whereas FWO iso-conversional method can avoid errors derived from simplified hypothetic mechanism functions, thus the method, capable of being applied to intrinsic kinetics researches of oil-coke combustion, can provide accurate kinetic parame- ters for the in-situ combustion development of heavy, ultra-heavy and extra-heavy oils.

关 键 词：火烧油层 稠油 高温氧化 动力学参数 热重 

分 类 号：TE345[石油与天然气工程—油气田开发工程]