中低温油藏空气驱过程中ClO_2加速原油氧化实验
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摘要
为了保证中低温油藏中空气驱油应用安全性,利用室内高压反应装置对中低温条件下氧气和原油的加速氧化反应进行了研究,并考察了含水饱和度对反应的影响。研究表明,稳定态ClO_2水溶液可以催化加速原油与空气的氧化反应,以降低出口端残余的氧气浓度。在压力12 MPa、温度45℃下,相比无催化剂条件下的氧化反应,加入催化剂氧化48 h后的氧气浓度大幅降至6%、CO_2浓度大幅增至7.6%,这能保证空气驱在中低温油藏的应用安全性。此外,原油中的胶质沥青质含量从10.5%降至6%,芳香烃含量从24%降至20%,饱和烃成分含量从63.8%增至68%。该催化剂适合含水饱和度较低(<60%)时的催化氧化加速,而对高含水饱和度条件的催化加速效果较差。实验结果为中低温油藏空气驱的安全应用提供了一种新的技术支撑。图6表2参15
In order to ensure the safety of application of air flooding in a media-low temperature reservoir,the accelerated oxidization of oxygen and the crude oil was studied at media-low temperature by using a high pressure chamber reactor,and the effect of water saturation on the reaction was also investigated. The results showed that the stabilized chlorine dioxide solution could be used as a type of catalyst,which could accelerate the reaction rate of oxygen and the crude oil to decrease the concentration of remaining oxygen when the gas reached the production well. The O_2 concentration could be greatly reduced to 6% and CO_2 concentration was greatly increased to 7.6% on condition with catalyst under the pressure of 12 MPa and the temperature of 45℃ after the reaction of 48 h,which could ensure the safety of air flooding in medium-low temperature reservoirs. In addition,the colloid and asphaltene content could be decreased from 10.5% to 6%,the asphaltene content could be decreased from 24% to 20%,and the saturated hydrocarbon content could be increased from 63.8% to 68%. The chlorine dioxide catalyst was adaptable of the accelerated oxidation of air flooding in the medium-low temperature reservoir with water saturation lower than 60%,while the accelerated oxidation effect was worse when the high water saturation was higher. The experimental results could provide theoretical basis for the application of air flooding in a media-low temperature reservoir.
In order to ensure the safety of application of air flooding in a media-low temperature reservoir,the accelerated oxidization of oxygen and the crude oil was studied at media-low temperature by using a high pressure chamber reactor,and the effect of water saturation on the reaction was also investigated. The results showed that the stabilized chlorine dioxide solution could be used as a type of catalyst,which could accelerate the reaction rate of oxygen and the crude oil to decrease the concentration of remaining oxygen when the gas reached the production well. The O_2 concentration could be greatly reduced to 6% and CO_2 concentration was greatly increased to 7.6% on condition with catalyst under the pressure of 12 MPa and the temperature of 45℃ after the reaction of 48 h,which could ensure the safety of air flooding in medium-low temperature reservoirs. In addition,the colloid and asphaltene content could be decreased from 10.5% to 6%,the asphaltene content could be decreased from 24% to 20%,and the saturated hydrocarbon content could be increased from 63.8% to 68%. The chlorine dioxide catalyst was adaptable of the accelerated oxidation of air flooding in the medium-low temperature reservoir with water saturation lower than 60%,while the accelerated oxidation effect was worse when the high water saturation was higher. The experimental results could provide theoretical basis for the application of air flooding in a media-low temperature reservoir.
引文
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[3]马颜丽,蒲春生,连超,等.甘谷驿地层水中亚铁离子耗氧规律实验研究[J].应用化工,2012,41(3):377-380.
[4] LIU P G,PU W F,LI Y B,et al. Low-temperature isothermal oxidation of crude oil[J]. Petrol Sci Technol,2016,34(9):838-844.
[5] LIU P G,PU W F,NI J H. Catalytic effect analysis of clay minerals on low-temperature oxidation of crude oil through combined thermal analysis methods[J]. Petrol Sci Technol,2016,34(4):343-349.
[6] CHAI Z H, WANG J, TAO S Y, et al. Application of bacteriophage borne enzyme combined with chlorine dioxide on controlling bacterial biofilm[J]. Lwt-Food Sci Technol,2014,59(2):1159-1165.
[7] SHI L S,WANG X M,LI N,et al. Chlorine dioxide catalytic oxidation and online FTIR spectroscopic analysis of simulated o-chlorophenol wastewater[J].Res Chem Intermed,2012,38(8):1781-1790.
[8] SHI L S,LI N,WANG C C,et al. Catalytic oxidation and spectroscopic analysis of simulated wastewater containing o-chlorophenol by using chlorine dioxide as oxidant[J].Water Sci Technol A J Int Assoc Water Pollut Res,2010,178(1-3):1137-1140.
[9] WANG C J,LIU H Q,PANG Z X,et al. Enhance oil recovery for steam flooding:low-temperature oxidative decomposition of heavy oil with air injection[J]. Energy Fuel,2015,29(10):6242-6249.
[10] ZHOU S Q,SHAO Y S,GAO N Y,et al. Effect of chlorine dioxide on cyanobacterial cell integrity,toxin degradation and disinfection by-product formation[J]. Sci Total Environ,2014(482):208-213.
[11]毕晓伊.微波强化ClO2催化氧化工艺及应用研究[D].哈尔滨:哈尔滨工业大学,2007.
[12]王杰祥,夏金娜,刘双龙,等.轻质原油低温氧化动力学研究[J].特种油气藏,2013,20(1):105-107.
[13]唐晓东,魏宇涛,李晶晶,等.原油注空气氧化反应及其动力学研究进展[J].化工进展,2016,35(1):83-90.
[14]林伟民,邓瑞健,刘勇,等.中原油田轻质油藏注空气低温氧化反应机理研究[J].油田化学,2013,30(4):534-538.
[15]廖广志,杨怀军,蒋有伟,等.减氧空气驱适用范围及氧含量界限[J].石油勘探与开发,2018,45(1):105-110.