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基于阶段演化特征的稠油氧化动力学
袁士宝^1,2,赵黎明^1,2,蒋海岩^1,2,程海清³
(1.西安石油大学石油工程学院,陕西西安 710065;2.陕西省油气田特种增产技术重点实验室,陕西西安 710065;3.中国石油辽河油田分公司,辽宁盘锦 124010)

摘要:

原油氧化阶段可分为低温氧化前段、低温氧化后段、燃料沉积和高温氧化4个阶段，在对各阶段氧化动力学参数的求取时，些文献中依然应用同反应机制函数进行计算。采用Coats-Redfern积分法对原油氧化过程中动力学参数进行计算，在假设简单反应机制函数情况下分别取反应级数为0、0.5、1进行计算，得到反应级数对氧化动力学参数的影响。通过对已有的30种反应机制函数计算得到不同原油氧化反应阶段逻辑上合理的反应机制方程及动力学参数。结果表明：在低温氧化阶段以相边界反应为主，在高温氧化阶段以三维扩散反应为主，Coats-Redfern积分法适用于计算原油氧化的动力学参数，所得到的曲线线性度较高。

关键词: 稠油 Coats-Redfern积分法动力学参数氧化

DOI：10.3969/j.issn.1673-5005.2018.04.009

分类号:TE345

文献标识码:A

基金项目:国家自然科学基金项目（51674198）；陕西省自然科学基金项目（2016JM5031）；陕西省教育厅项目（16JS095）

Oxidation kinetics of heavy oil based on stage evolution

YUAN Shibao^1,2, ZHAO Liming^1,2, JIANG Haiyan^1,2, CHENG Haiqing³

(1.Petroleum Engineering Institute of Xi 'an Shiyou University, Xi 'an 710065, China;2.Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil ＆ Gas Reservoirs, Xi 'an 710065, China;3.Liaohe Oilfield Company, PetroChina, Panjin 124010, China)

Abstract:

Oil oxidation and relevant reactions can be divided into 4 stages during air injection process for in-situ combustion, including the initial stage of low temperature oxidation, the later stage of low temperature oxidation, fuel deposition and high temperature oxidation. To obtain the oxidation kinetics parameters of each stage, a similar oxidation mechanism function has been applied in the literature, in which the reaction characteristics of the 4 reaction stages were not fully considered. In this paper, a Coats-Redfern integral method was used to calculate the oxidation kinetic parameters. Based on a simple reaction mechanism function, the reaction order is assumed as 0,0.5 and 1, and the influence of the reaction order on the oxidation kinetics parameters was analyzed. A reaction kinetics model and its kinetic parameters were obtained via data processing using existing 30 reaction mechanism functions. It is found that the phase boundary reaction is dominant in the low temperature oxidation stage, and the three-dimensional diffusion reaction is the main stage in the high temperature oxidation stage. The Coats-Redfern integral method is suitable for the calculation of the kinetic parameters for crude oil oxidation with high accuracy.

Key words: heavy crude oil Coats-Redfern integral method kinetic parameters oil oxidation