偏心环空中幂率流体层流流动特性数值模拟研究  

Effects of the Inner Pipe Rotation and Rheological Parameters on the Axial and Tangential Velocity Profiles and Pressure Drop of Yield Power-Law Fluid in Eccentric Annulus

作　　者：Hicham Ferroudji Ahmed Hadjadj Titus N Ofei Ahmed Haddad Hicham Ferroudji;Ahmed Hadjadj;Titus N Ofei;Ahmed Haddad(Laboratory of Petroleum Equipment’s Reliability and Materials,Hydrocarbons and Chemistry Faculty,University M’hamed Bougara of Boumerdes,Boumerdes,35000,Algeria;Petroleum Engineering Department,Universiti Teknologi PETRONAS,Bandar Seri Iskandar,Tronoh,32610,Malaysia;Research Center in Industrial Technologies CRTI.,Algiers,16033,Algeria)

机构地区：[1]布米尔达斯布加拉穆罕默德大学碳氢化合物与化学系,石油装备可靠性与材料实验室,布米尔达斯35000 [2]马来西亚石油科技大学石油工程系,斯里依斯干达32610 [3]CRTI工业技术研究中心,阿尔及尔16033

出　　处：《石油钻探技术》2020年第4期37-42,共6页Petroleum Drilling Techniques

摘　　要：Herschel-Bulkley模型(即屈服幂率模型)可用于研究非牛顿流体的流动特性,并能在大范围剪切速率条件下得到准确的预测结果。为此,采用有限体积方法(FVM),研究了内部管柱旋转及流变参数(屈服应力τ0、稠度系数K和流性指数n)对偏心环空(E=0.5)中Herschel-Bulkley流体层流区域的轴向、切向速度剖面与压降梯度的影响。研究结果表明,内部管柱转速从100 r/min增加至400 r/min时,会引起最大轴向速度增加,增幅为120%;较低的流性指数(n=0.2)会引起偏心环空宽区域出现二次流;内部管柱转速及流变参数的变化对偏心环空宽区域切向速度剖面有不良影响;内部管柱转速从0增加至400 r/min时,会引起不同偏心环空(E=0.2,0.4,0.6和0.8)内幂率流体压降梯度降低,降低幅度为10%。Drilling fluid mostly behaves as non-Newtonian fluid and it can be modelled by the Herschel-Bulkley model,which is also called yield power-law(YPL).This model provides accurate results for a wide range of shear rate.In the present paper,a numerical study of the Herschel-Bulkley fluid through the eccentric annulus(E=0.5)was performed for the laminar flow regime using finite volume method(FVM).Effect of the inner pipe rotation and rheology parameters(yield stressτ0,consistency index K and behavior index n)on the axial and tangential velocity profiles and pressure drop gradient were studied.Results showed that increasing the inner pipe rotation from 100 to 400 rpm induces an increase of 120%of the maximum axial velocity.Low value of the behavior index(n=0.2)causes the appearance of the secondary flow in the wide region of the annulus.The variation of the inner pipe rotation and rheological parameters of the Herschel-Bulkley fluid have a negligible effect on the tangential velocity profile in the wide region of the eccentric annulus.Furthermore,It was observed that the increase of the inner pipe rotation from 0 rpm to 400 rpm causes a decrease of 10%of pressure drop gradient of yield power-law fluid for all eccentric annulus(E=0.2,E=0.4,E=0.6 and E=0.8).

关 键 词：计算流体力学 幂率流体 偏心环空 层流流动 流变参数 流动特性 压降梯度 

分 类 号：TE21[石油与天然气工程—油气井工程]