钻井液控制锥阀阀口处流场的数值仿真  

Numerical Simulation of Flow Field in Orifice of Hydraulic Cone Control Valve for Drilling Fluids

作　　者：朱万胜[1,2] 尹玉芳[3] 张作龙[2] 张彦廷[2] 

机构地区：[1]胜利油田钻井工艺研究院,东营257000 [2]中国石油大学机电工程学院,东营257061 [3]中国石油大学物理科学与技术学院,东营257061

出　　处：《系统仿真学报》2010年第8期1849-1852,共4页Journal of System Simulation

基　　金：国家863(2008AA09Z311)

摘　　要：基于计算流体力学方法,采用幂律流变模型和RNG k-ε湍流模型对钻井液锥阀阀口处的内部流场进行数值仿真计算。通过对流场内流线形状、压力和流速的大小及其分布情况进行分析,着重研究了阀芯半锥角、阀芯前部过渡圆弧、阀座倒角等对钻井液锥阀流场的影响。结论如下:(1)随阀芯半锥角的增加,阀芯锥面与柱面交界处的压力有先减小后增大的趋势;(2)阀芯锥面与柱面交界处的过渡圆弧有利于改善该处压力状况,但圆弧半径增大到一定程度后,压力变化不再显著;(3)阀座处倒角后,能量损失减小,但阀口处压力降低,且倒角长度愈长,压力愈低。Power-law rheological model and RNG k-ε turbulence model were used to simulate the flow field in hydraulic poppet valve for drilling fluids,which are based on computational fluid dynamics approach.The effect of angle of poppet,arc in front of poppet and chamfer of valve seat in the flow field within cone valve was investigated emphatically by analyzing the form of stream line,the data and distribution of pressure and velocity.Results show：（1） With the increasing of poppet＇s angle,the pressure will decrease at first,then increase,at the junction of cone and cylinder of the valve.（2） The arc at the junction of cone and cylinder of the valve will help to improve the situation of the pressure.However,when the radius of the arc is increased to a certain extent,the pressure will not change significantly.（3） when valve seat is chamfered,energy loss will decline in the Flow Field,the pressure in orifice will decrease too,and the longer length of the chamfer,the lower the pressure will be.

关 键 词：非牛顿 幂律流体 湍流 锥阀 数值仿真 

分 类 号：TE927[石油与天然气工程—石油机械设备]