固体颗粒对油气井管柱的冲蚀损伤研究

摘要

The solid particles contained in liquid with high speed will certainly cause damage and erosion to oil and gas well tube.It is necessary to study the properties of columns of oil and gas pipe subjected to particle erosion.In this paper the processes of the 90 degree bend pipe of the oil column subjected to particle erosion were simulated using the turbulent model and DPM model in Fluent,and the influence of different factors on the erosion rate and erosion of the inner wall of the bend pipe were studied.The results show that the erosive wear of the solid particles to the elbow pipe is mainly occurred on the inner wall of the outer arc of elbow of the bending section.In the case of fluid velocity and particle mass flow rate are kept constant,the erosion rate of curved inner wall subjected to particle erosion increases with the decreases of the fluid viscosity and the increase of the diameter of the solid particles;and the erosion amount increases linearly with the increases of erosion time.In the case of other factors are kept constant,the erosion rate of curved inner wall subjected to particle erosion increases with increasing fluid velocity slowly,and the increment decreases gradually.The simulation results provide a theoretical basis and reference for the reasonable design of tubing string in oil and gas wells.%油气井管柱内液体高速流动时,液体内含有的固体颗粒会对管柱造成损伤和冲蚀,因此有必要对油气井管柱受颗粒冲蚀特性进行研究.本文利用Fluent中湍流模型和DPM模型对90°弯曲油气管柱的固体颗粒冲蚀过程进行了数值模拟,研究不同影响因素下弯管内壁的冲蚀率及冲蚀效果.结果表明:固体颗粒对弯管的冲蚀磨损主要发生在弯曲段的下弯头外弧内壁;在流体速度和颗粒质量流率一定时,固体颗粒对弯曲内壁的冲蚀率随着流体黏度的增大而减小,随着固体颗粒直径的增大而增大,冲蚀量随着冲蚀时间的增加而呈线性增加;其他因素一定的条件下,固体颗粒对弯曲内壁的冲蚀率随着流体速度的增大而缓慢增大,增量逐渐减小.模拟结果为油气井管柱弯管的合理设计提供了数值依据和理论参考.