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天然气地球科学

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低频振动单相不可压缩流体细管流动微观动力学数学模型研究

刘静，蒲春生，林承焰，吴飞鹏   

  1. 1.中国石油大学(华东)石油工程学院，山东 青岛 266580；
    2.中国石油大学(华东)地球科学与技术学院,山东 青岛 266580
  • 收稿日期:2013-10-16 修回日期:2014-01-07 出版日期:2014-10-10 发布日期:2014-10-10
  • 作者简介:刘静(1982-)，女，河南商丘人，博士后，主要从事油气藏开发地质学与油气田开发方面的研究. E-mail：liujing4522009@163.com.
  • 基金资助:

    国家科技重大专项大型油气田及煤层气开发“低渗透油藏大功率谐振波—化学驱复合技术研究”(编号:20011ZX05009-004);国家自然科学基金“低渗油藏低频振动辅助表面活性剂复合驱油机理研究”(编号:51274229);国家自然科学基金“延时式可控高能气体压裂技术动力学机理研究”(编号:51104173);
    中国博士后科学基金面上资助“裂缝性特低渗油藏波动辅助凝胶调剖耦合作用机理研究”联合资助.

Mathematical Model of Microscopic Dynamics about Single-Phrase Incompressible Fluid Flows in Thin Tube under Low Frequency Vibration

LIU Jing，PU Chun-sheng,LIN Cheng-yan ,WU Fei-peng   



  1. (1.School of Petroleum Engineering in China University of Petroleum,Qingdao 266580,China；
    2.School of Geosciences in China University of Petroleum,Qingdao 266580,China)
  • Received:2013-10-16 Revised:2014-01-07 Online:2014-10-10 Published:2014-10-10

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462

摘要：

为揭示低频振动对地层以及流体流动规律的影响，鉴于储层孔隙体系结构的复杂性，采用细管多孔介质模型，针对单一细管中的单相不可压缩流体,将低频波对流体流动产生惯性力引入圆管层流的Naver—Stokes(N—S)方程，建立了低频振动条件下单相不可压缩流体在细管中流动的微观动力学模型。该模型采用C—N差分格式，对低频振动条件下单一细管中流体流速以及剪切力分布进行模拟计算和定量分析。结果表明，低频振动条件下圆管中的流速随管径呈抛物线型分布，随时间以不振动下速度分布为中心轴线呈周期性变化|黏附层处剪切力也是随时间以不振动下的剪切力为中心轴线呈现周期性变化，当剪切力大于黏附层流动的临界剪切力时，黏附层会部分发生流动。该模型的建立与求解，为进一步揭示低频振动对地层渗透性微观动力学增效机制提供了重要认识。
 

关键词: 低频振动, 单相不可压缩流体, 渗流速度, 黏附层

Abstract:

In order to discover the effect of low frequency wave on strata and the law of fluid flow,mathematical model of microscopic dynamics about single-phrase incompressible fluid flows in thin tube under low frequency vibration was established,which is based on inertial force that produced from low frequency vibration when fluid motion is induced into N-S equation of tube with laminar.Using this C-N differential format,fluid velocity and shear force distribution in single thin tube were simulated and quantitatively analyzed under low frequency vibration.The results show that fluid flow rate presents a parabolic distribution with diameter and a periodical change that centered on no-vibration fluid velocity distribution with time in single thin tube under low frequency vibration|shear force at adhesion layer also presents a periodical change that centered on no-vibration fluid velocity distribution with time.When the shear force is greater than the critical shear force of the adhesive layer flows,the portions of the adhesive layer will flow.Establishment and solution of the model provide an important understanding for further discovery of the microscopic dynamics synergistic mechanism that low-frequency vibration has on the formation permeability.
 

Key words: Low frequency vibration, Single-phase incompressible fluid, Seepage velocity, Adhesion layer

中图分类号: 

  • TE357
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