Oil and gas pipelines will deposit various impurities in the pipeline after a certain operating time,and in severe cases,the impurities may even block the pipeline which will affect the transportation efficiency and safety of the pipeline.It is necessary to use pipeline pigging cleaner(PIG)to regularly remove the impurities.The running speed will affect the cleaning effect and safety of the PIG,and the running speed can be effectively adjusted by opening a discharge hole,however,excessive discharge hole may cause the PIG unable to run properly.Taking the φ610 speed control PIG as an example,Fluent overset dynamic grid technology was used to analyze the impact of discharge holes on the starting force of the PIG.The impact of changes in the diameter of discharge hole on the starting force when the PIG was stationary was analyzed,which could determine whether the PIG with discharge hole could start normally.The impact of the running speed of the PIG on the pressure difference between the front and rear of the PIG was analyzed,which could determine whether the PIG could run normally at the running speed.The running resistance of the PIG was obtained through pulling test,compared with the Fluent analysis results to determine whether the PIG could start and run normally.The reliability of the Fluent analysis results had been verified through industrial field tests.
pipelinepiggingdynamic gridstarting forcefinite element analysis
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