螺旋套管扶正器诱导环空流场的数值模拟  

Numerical Simulation on the Annular Flow Induced by Spiral Casing Centralizer

作　　者：李洪乾[1] 

机构地区：[1]中国石化国际石油勘探开发有限公司,北京100083

出　　处：《石油钻探技术》2012年第2期25-29,共5页Petroleum Drilling Techniques

摘　　要：为了优化固井设计、确定螺旋套管扶正器的合理安放位置、有效提升水泥浆的顶替效率,对螺旋套管扶正器诱导环空流场进行了理论分析。依据环空流体动力学基本理论,建立了环空流场的理论模型,采用数值模拟方法对螺旋套管扶正器诱导的环空螺旋流动规律进行了研究,并利用室内试验对有限元数值的计算结果进行了验证,有限元数值计算结果和激光测速试验数据吻合较好,证明了有限元数值计算方法的可行性。借助ANSYS软件对不同条件下流场的变化以及有效旋流长度的变化进行了计算,总结了螺旋扶正器螺旋角、屈服应力、流量对旋流速度以及有效旋流长度的影响规律。数值模拟结果表明,螺旋角和流量对旋流速度和有效旋流长度影响很大。It is necessary to analyze the annular flow law induced by spiral casing centralizer in order to properly determine the location of spiral casing centralizer and improve slurry displacement efficiency,which will be meaningful to cementing optimization.Based on annular fluid dynamics,the theoretical model of the flow field in annulus was established,the annular flow induced by spiral casing centralizer was analyzed and the numerical calculation results was verified by using the experimental result.These results matched well with the laser velocity measurement data,showing that the finite element analytical method is reliable.By using ANSYS software,the annular flow and effective whirl flowing length were calculated under different conditions,and the effects of spiral angle of casing centralizer,yield stress and flow rate to whirl velocity were analyzed.The results of numerical simulation indicate that the whirl velocity and the effective whirl flowing length are strongly influenced by spiral angle of casing centralizer and flow rate,which would be an essential consideration for optimizing the location of spiral casing centralizer.

关 键 词：螺旋扶正器 数值模拟 环空流场 顶替效率 

分 类 号：TE256.2[石油与天然气工程—油气井工程]