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时间:2020-05-04
《微圆管中流体的微观流动机制-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、科技导报2014,32(27)WWW.kjdb.org微圆管中流体的微观流动机制朱维耀,田英爱,于明旭,韩宏彦,张雷龄北京科技大学土木与环境工程学院,北京100083摘要针对低渗透油藏储层孔隙喉道小的特点,采用管径为20、15、10、5um的微圆管,以去离子水和煤油为流动介质,研究微圆管中流体的微观流动规律,分析去离子水和煤油的实验流速、有效边界层厚度与压力梯度的关系,考察壁面润湿性和流体黏度对微流动规律的影响。研究表明,微管中流体流速与压力梯度基本成线性关系,随着微管管径的减小,流体流动的非线性程度增强,且驱动压力越大,微管有效边界
2、层厚度越小,参与流动的流体更多,有效流体边界层厚度占微管管径的比例也随之降低;微管壁面由亲水性变为疏水性后,流体流速均高于改性前,微管管径越大,作用效果越显著;改变流体黏度时,出现明显的启动压力梯度特征,实验流体黏度从2.40mPa·s增至10.20mPa·s时,对应的启动压力梯度由1.26MPa/rn增加到6.83MPa/m。关键词低渗透;微圆管;微流动;启动压力梯度中图分类号0357.3文献标志码Adoi10.3981issn.1000-7857.2014.27.003MechanismofMicroscopicFluidFlow
3、inMicrotubesZHUWeiyao,TIANYingai,YUMingxu,HANHongyan,ZHANGXuelingCivilandEnvironmentalEngineeringSchool,UniversityofScienceandTechnology,Beijing100083,ChinaAbsttamLowpermeabilityreservoirusuallyhassmallporethroat.Basedonthischaracteristic,themechanismofmicroscopicfluidf
4、lowinmicrotubeswasstudiedusingone—dimensionalmicrotubeswithinnerdiametersof5,10,15,20mwithdeionizedwaterandkeroseneastheflowmedia.TheIlelationshipsamongflowrate,boundarylayerthicknessandpressuregradientarerevealed.Microtubulesurfacewettabilitywaschangedfromhydrophilicto
5、hydrophobicwithmixturesofdimethyldichlorosilane,kerosene,andsiliconeareindifferentproportionstoformfourdifferentsimulatedoilviscositiestostudythelawgoverningthefluidflow.Theresuhsshowthatthefluidflowratehadalinearrelati0nshipwithpressuregradient,butnonlinearityoffluidfl
6、owgraduallyincreasedwithdecreaseofthemicrotubulediameter.Also,thehigherthedrivingpressure,thesmallertheeffectiveboundarylayerthickness,andtheratioofeffectivefluidboundarylayerthicknesstomicrotubulediameterdecreasedwithpressuregradient.Thefluidvelocitywashigherthanthatbe
7、foremodificationofthemicrotubulewallfromhydrophilictohydrophobic,andthelargerthesizeofmicrotubules,themoresignificanttheeffect.Thepressuregradientincreasedsignificantlyfrom1.26MPMmto6.83MPa/mwhentheviscosityoftheflowmediawaschangedfrom2.40mPa·sto10.20mPa·s.Koywordslowpe
8、rmeability;microtubes;microflow;pressuregradient掌握流体在微尺度效应下的微观流动规律,是实现高效从微观动力学角度解释微通道中流体的流动现象。孙尚武开采的基础。研究流体在低渗
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