天然气管道清管器自激振动模型及影响规律  

Model and influential laws on the self-excited vibration of pigs for natural gas pipelines

作　　者：李华 王珂 王东 廖柯熹 LI Hua;WANG Ke;WANG Dong;LIAO Kexi(PetroChina Pipeline R ＆ D Center/CNPC Key Laboratory of Oil ＆ Gas Storage and Transportation;Gathering and Transportation Group,Linpan Oil Production Plant,SINOPEC Shengli Oiltield Company;College of Petroleum and Natural Gas Engineering,Southwest Petroleum University)

机构地区：[1]中国石油管道科技研究中心/中国石油天然气集团公司油气储运重点实验室 [2]中石化胜利油田临盘采油厂集输大队 [3]西南石油大学石油与天然气工程学院

出　　处：《油气储运》2018年第10期1163-1169,共7页Oil & Gas Storage and Transportation

摘　　要：在清管器前端所聚集的杂质和管道内壁摩擦力的共同作用下,清管器皮碗会发生较大振动,甚至发生变形,从而降低清管作业的有效性。基于LuGre模型和Stribeck曲线,描述了清管器皮碗与管道内壁间摩擦力的非线性变化规律,通过合理约束清管器皮碗径向的自由度,建立了由集中质量弹性微元体表征的清管器自激振动模型。采用Matlab仿真软件,对DN200管道皮碗清管器不同工况下的自激振动规律进行分析,结果表明:随着过盈量增加,皮碗清管器的振幅随之增加;随着运行速度增加,皮碗清管器振幅先增加后降低。建立的天然气管道清管器自激振动模型,为合理选择皮碗清管器过盈量和清管运行速度提供了依据,可有效提高天然气管道清管作业的安全性与有效性。In the process of pigging, the cup of the pig will suffer greater vibration and even deformation under the joint effect of the impurities accumulated at the front end of the pig and the friction on inner wall of the pipeline, and thereby the effectiveness of the pigging operation is reduced. In this paper, the nonlinear change laws of friction between pig cup and pipeline inner wall were described based on LuGre model and Stribeck curve. Then, the pig self-excitation model characterized by the lumped mass elastic micro-body was established by constraining the radial DOF of the cup reasonably. Finally, the self-excited vibration laws of cup type pig for DN200 pipeline under different working conditions were analyzed using Matlab simulation software. It is shown that the amplitude of cup type pig increases with the increase of the interference, while increases firstly and then decreases with the increase of its running speed. In conclusion, the model and influential laws on the self-excited vibration of the pig for natural gas pipelines provide the basis for selecting the interference and running speed of cup type pig, so as to effectively improve the pigging safety and effectiveness of natural gas pipelines.

关 键 词：天然气管道 清管器 皮碗 自激振动 LUGRE模型 STRIBECK曲线 

分 类 号：TE822[石油与天然气工程—油气储运工程]