针对轻质油藏高压注空气开发过程中低温氧化模式不明确、常规空气驱安全风险高的问题,以新疆X油藏为例,采用静态等温氧化管实验和非等温热重测试(TG/DTG-DTA)手段,结合色谱测试、红外光谱分析、物性测量以及经典的Arrhenius动力学模型,从微观角度分析氧化过程中原油碳烃分子结构的变化及氧化特征。结果表明:原油主要体现的低温氧化模式为加氧反应、缩聚反应和碳键剥离反应;增大氧含量和储层岩石的非均相催化作用可以使低温氧化更易进行,加深氧化程度,形成更多后续燃料沉积所需的基质;原油在氧含量为13%的减氧空气中仍具有较高的氧化活性和较强的燃料基质生成能力,同时储层岩石中存在黏土矿物和活性金属元素,这为新疆X油藏成功实施减氧空气驱展现出极大的潜力。研究成果对于储层中黏土矿物含量较高的轻质油藏实施减氧空气驱具有一定的指导意义和理论支撑。
Addressing the unclear patterns of low-temperature oxidation(LTO)and high safety risks of conventional air flooding in light oil reservoirs during high-pressure air injection,this study took the Xinjiang X reservoir as an example.Using static isothermal oxidation tube experiments and non-isothermal thermogravimetric analysis(TG/DTG-DTA),combined with chromatography,infrared spectroscopy,physical property measurements,and the classical Arrhenius kinetic model,analysis was done from a microscopic perspective about the changes in crude oil hydrocarbon molecular structure and oxidation characteristics during oxidation.Results showed that the main LTO reactions of the crude oil were oxygen-addition,polycondensation,and C-C bond scission.Increasing oxygen concentration and the heterogeneous catalytic effect of reservoir rock facilitated LTO,deepening oxidation and generating more fuel-grade residue precursors.Crude oil in 13% O2 depleted air still exhibited high oxidation reactivity and strong fuel-residue generation capacity,and the presence of clay minerals and active metal elements in the reservoir rock indicated great potential for implementing oxygen-depleted air injection in the Xinjiang X reservoir.This study provides positive guidance and theoretical support for implementing oxygen-depleted air flooding in high-clay-content light oil reservoirs.
[1] 王哲,曹广胜,白玉杰,等.低渗透油藏提高采收率技术现状及展望[J].特种油气藏,2023,30(1):1-13.
WANG Zhe,CAO Guangsheng,BAI Yujie,et al.Development status and prospect of EOR technology in low-permeability reservoirs[J].Special Oil & Gas Reservoirs,2023,30(1):1-13.
[2] LIU Zhezhi,PU Wanfen,ZHAO Xiangguo,et al.Combustion tube experiments on key factors controlling the combustion process of air injection with light oil reservoir[J].Geoenergy Science and Engineering,2023,224:211611.
[3] PU Wanfen,USHAKOVA A,ZATSEPIN V.Chain reactions approach to the initial stages of crude oil oxidation[J].Energy and Fuels,2018,32(11):11936-11946.
[4] LUO Chen,LIU Huiqing,ZHOU Song,et al.Catalytic role of various clay minerals during the thermal reaction process with oxidized and pyrolyzed oils[J].Journal of Thermal Analysis and Calorimetry,2024,32:13301.
[5] LIU Penggang,PU Wanfen,LI Yibo,et al.Low-temperature isothermal oxidation of crude oil[J].Petroleum Science and Technology,2016,34(9):838-844.
[6] PU Wanfen,YUAN Chengdong,JIN Fayang,et al.Low-temperature oxidation and characterization of heavy oil viathermal analysis[J].Energy and Fuels,2015,29(2):1151-1159.
[7] MURUGAN P,MAHINPEY N,MANI T.Effect of low temperature oxidation on the pyrolysis andcombustion of whole oil[J].Energy,2010,35(5):2317-2322.
[8] LI Yibo,CHEN Yafei,PU Wanfen,et al.Low temperature oxidation characteristics analysis of ultra-heavy oil by thermal methods[J].Journal of Industrial and Engineering Chemistry,2017,48:249-258.
[9] KÖK M V.Non-isothermal kinetic analysis and feasibility study of medium grade crude oil field[J].Journal of Thermal Analysis and Calorimetry,2008,91:745-748.
[10] CHEN Zhenya,WANG Lei,DUAN Qiong,et al.High-pressure air injection forimproved oil recovery:low-temperature oxidation models and thermal effect[J].Energy and Fuels,2013,27(2):780-786.
[11] QI Huan,LI Yiqiang,CHEN Xiaolong,et al.Low-temperature oxidation of light crude oil in oxygen-reduced air flooding[J].Petroleum Exploration and Development,2021,48(6):1210-1217.
[12] BUNGER J W.Inhibition of coke formation in hydropyrolysis of residual oils[J].American Chemistry Society,1985,30(3):549-554.
[13] SANFORD E C.Molecular approach to understanding residuum conversion[J].Industrial & Engineering Chemistry Research,1994,33(1):109-117.
[14] ZHAO Jinzhou,JIA Hu,PU Wanfen,et al.Sensitivity studies on the oxidation behavior of crude oil in porous media[J].Energy and Fuels,2012,26(11):6815-6823.
[15] CHEN Yanling,HE Jing,WANG Yuanqing,et al.GC-MS used in study on the mechanism of the viscosity reduction of heavy oil through aquathermolysis catalyzed by aromatic sulfonic H3PMo12O40[J].Energy,2010,35(8):3454-3460.
[16] JIA Hu,NI Jihui,PU Wanfen,et al.New view on the oxidation mechanisms of crude oil through combined thermal analysis methods[J].Journal of Thermal Analysis and Calorimetry.2014,118(3):1707-1714.
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