掺稀采油管内稠油流速径向分布特性研究
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摘要
考虑稠油(幂律流体)与稀油(牛顿流体)层间扩散、相间作用力、掺混粘度等参数,建立了掺稀采油管内牛顿-幂律流体的流速计算模型对其编程求解;从掺稀前及掺稀后两种工况着手,对稠油掺稀采油管内流速的径向分布规律进行了详细分析。结果表明:流速在油管中的分布呈现轴对称性;随采油管外径增大、稠油稠度系数增大及采油管压力降的减小,采油管径向上稠油流速呈现减小趋势;稠油掺稀过程中,与层流的流动对比分析发现,稠油和稀油掺混时紊流流动过程中的过渡段出现增大趋势,此时的掺混速度以及均匀程度都有所提高。
There is almost no existing studies focus on microscopic description of heavy oil and thin oil layer diffusion motion law. Thus, considering inter-layer diffusion, phase reaction, mixing viscosity parameters of heavy oil(power law fluid) and thin oil(Newtonian fluid), a Newton-power law fluid mixing flow velocity model is put forward. Through programming solution, radial distribution characteristics of flow velocity in tube and its mechanism between heavy oil and thin oil is discussed in detail by analyzing the two kinds of conditions, the blank heavy oil case and the diluted heavy oil case. The results show that the flow velocity in the tube isaxisymmetric. The radial distribution of heavy oil flow velocity in tube shows a trend of decreasing with the increase of borehole diameter, or decrease of pressure drop, or increase of viscosity of heavy oil. During the process of heavy oil diluted with thin oil, compared to laminar flow, the thickness of the transition section of heavy oil and thin oil increased when the flow in the tube is turbulent flow, so that the mixing speed and mixing uniformity can be improved.
There is almost no existing studies focus on microscopic description of heavy oil and thin oil layer diffusion motion law. Thus, considering inter-layer diffusion, phase reaction, mixing viscosity parameters of heavy oil(power law fluid) and thin oil(Newtonian fluid), a Newton-power law fluid mixing flow velocity model is put forward. Through programming solution, radial distribution characteristics of flow velocity in tube and its mechanism between heavy oil and thin oil is discussed in detail by analyzing the two kinds of conditions, the blank heavy oil case and the diluted heavy oil case. The results show that the flow velocity in the tube isaxisymmetric. The radial distribution of heavy oil flow velocity in tube shows a trend of decreasing with the increase of borehole diameter, or decrease of pressure drop, or increase of viscosity of heavy oil. During the process of heavy oil diluted with thin oil, compared to laminar flow, the thickness of the transition section of heavy oil and thin oil increased when the flow in the tube is turbulent flow, so that the mixing speed and mixing uniformity can be improved.
引文
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[2]唐长久,盖洁超.稠油热采技术发展综述[J].石化技术,2018,25(1):41.(TANG Changjiu,GAI Jiechao.Summarization of heavy oil thermal recovery technology[J].Petrochemical technology,2018,25(1):41(in Chinese)).
[3]顾浩,孙建芳,秦学杰,等.稠油热采不同开发技术潜力评价[J].油气地质与采收率,2018(3):1-5.(GU Hao,SUN Jianfang,QINXuejie,et al.Potential evaluation of different thermal recovery technologies for heavy oil[J].Petroleum geology and recovery efficiency,2018(3):1-5(in Chinese)).
[4]曹畅,艾克热木?牙生,刘磊,等.稠油高粘机理及掺稀降粘技术进展与展望[J].油气储运,2018,37(3):248-255.(CAO Chang,YASIN Akram,LIU Lei,et al.Research progress and prospect of viscosity reducing technology by mixing heavy oil with light oil[J].Oil and gas storage and transportation,2018,37(3):248-255(in Chinese)).
[5]TABORDA E A,FRANCO C A,RUIZ M A,et al.Experimental and theoretical study of viscosity reduction in heavy crude oils by addition of nanoparticles[J].Energy&fuels,2017,31(2):1329-1338.
[6]ALOMAIR O,ELSHARKAWY A,ALKANDARI H.A viscosity prediction model for Kuwaiti heavy crude oils at elevated temperatures[J].Journal of petroleum science&engineering,2014,120(8):102-110.
[7]ARAFIN S,RAHMAN S M M.Velocity profiles for flow of omani crude oils and other liquids[J].SQU journal for science,2014,19(1):87-94.
[8]孔祥伟,林元华,何龙,等.钻井多相流体运移特性及套压控制研究[J].应用力学学报,2015,32(5):823-827.(KONG Xiangwei,LIN Yuanhua,HE Long,et al.Migration characteristics and control of back pressure for multiphase fluid along wellbore in drilling operations[J].Chinese journal of applied mechanics,2015,32(5):823-827(in Chinese)).
[9]侯珍珍.特超稠油的胶体化学性质研究[D].北京:中国石油大学,2010.(HOU Zhenzhen.Research on the colloidal chemistry of ultra-heavy oil[D].Beijing:China University of Petroleum,2010(in Chinese)).
[10]杨筱蘅.输油管道设计与管理[M].北京:中国石油大学出版社,2006.(YANG Xiaoheng.Design and management of oil pipeline[M].Beijing:China Petroleum University Press,2006(in Chinese)).
[11]张红艳,白长青,吴伟阳,等.气液两相段塞流作用下管道流固耦合动力学分析[J].应用力学学报,2017,34(4):661-665.(ZHANGHongyan,BAI Changqing,WU Weiyang,et al.Fluid-structure interaction dynamic analysis of pipe under gas-liquid two-phase slug flow[J].Chinese journal of applied mechanics,2017,34(4):661-665(in Chinese)).