Properties,combustion behavior,and kinetic triplets of coke produced by low-temperature oxidation and pyrolysis:Implications for heavy oil in-situ combustion  

作　　者：Shuai Zhao Wan-Fen Pu Lei Su Ce Shang Yang Song Wei Li Hui-Zhuo He Yi-Gang Liu Zhe-Zhi Liu 

机构地区：[1]State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan,610500,China [2]Post-Doctorate R&D Base,Southwest Petroleum University,Chengdu,Sichuan,610500,China [3]E&D Research Institute of Liaohe Oilfield CNPC,Panjin,Liaoning,124000,China [4]School of Oil and Gas Engineering,Chongqing University of Science and Technology,Chongqing,401331,China

出　　处：《Petroleum Science》2021年第5期1483-1491,共9页石油科学（英文版）

基　　金：supported by Chinese Postdoctoral Science Foundation (2021M692696);the National Science and Technology Project (2016ZX05058-003-017);Sichuan Science and Technology Program (2021YFH0081)。

摘　　要：This work aimed at investigating the crucial factor in building and maintaining the combustion front during in-situ combustion(ISC),oxidized coke and pyrolyzed coke.The surface morphologies,elemental contents,and non-isothermal mass losses of the oxidized and pyrolyzed cokes were thoroughly examined.The results indicated that the oxidized coke could be combusted at a lower temperature compared to the pyrolyzed coke due primarily to their differences in the molecular polarity and microstructure.Kinetic triplets of coke combustion were determined using iso-conversional models and one advanced integral master plots method.The activation energy values of the oxidized and pyrolyzed cokes varied in the range of 130-153 k J/mol and 95-120 kJ/mol,respectively.The most appropriate reaction model of combustion of the oxidized and pyrolyzed cokes followed three-dimensional diffusion model(D_(3)) and random nucleation and subsequent growth model(F_(1)),respectively.These observations assisted in building the numerical model of these two types of cokes to simulate the ISC process.

关 键 词：Oxidized coke Pyrolyzed coke Heavy oil In-situ combustion Kinetic triplets 

分 类 号：TE345[石油与天然气工程—油气田开发工程]