超声波流量计误差分析及实时计量方法研究  

Research on the error analysis and on-line measurement method of ultrasonic flowmeter

作　　者：张金环 ZHANG Jinhuan(No.8 Oil Production Plant of Daqing Oilfield Co.,Ltd.)

机构地区：[1]大庆油田有限责任公司第八采油厂

出　　处：《石油石化节能与计量》2025年第4期63-68,共6页Energy Conservation and Measurement in Petroleum & Petrochemical Industry

摘　　要：为充分挖掘在线色谱仪获取的数据信息,实现超声波流量计计量从固定组分赋值向实时组分赋值的转变,在梳理流量计工作原理和计量准确度影响因素的基础上,确定了不同工况下的实时计量方法,引入了修正系数完成固定组分和实时组分之间计量结果差异的转换,通过实例分析了计量误差的分布范围和分布趋势。结果表明,计量准确度受天然气组分的影响较大,实时组分的摩尔分数随时间呈随性无序变化;对于未安装在线色谱仪的站场,通过组分跟踪法可以实现不同时间和空间内的组分赋值,建议待赋值组分站场与上游站场的距离不超过70 km;5月、6月、9月的累积误差为负值,有利于卖方市场;7月、8月、10月、11月和12月的累积误差为正值,有利于买方市场;累积流量误差为-1.775×10^(4) m^(3),累积能量误差为-64.173×10^(4) MJ,延长计量时间有利于累积流量误差的相互抵消。In order to fully exploit the data information obtained by the online chromatograph and realize the transformation of ultrasonic flowmeter measurement from fixed component assignment to real-time component assignment,the online measurement method under different working conditions is determined on the basis of sorting out the working principle of the flowmeter and the factors affecting the measurement accuracy,and the correction coefficient is introduced to complete the conversion of the measurement results difference between fixed component and real-time component.The distribution range and distribution trend of measurement errors are analyzed by examples.The results show that the measurement accuracy is greatly affected by the components of natural gas,and the molar fraction of real-time components changes randomly and disordered with time.For the station without on-line chromatograph,the component assignment in different time and space can be realized by component tracking method.It is recommended that the distance between the station and the upstream station should not exceed 70 km.The cumulative error for May,June and September is negative,which is conducive to the seller's market.The cumulative error for July,August,October,November and December is positive,which favors the buyer's market.The cumulative flow error is-1.775×10^(4) m^(3) and the cumulative energy error is-64.173×10^(4) MJ.Extending the measurement time is conducive to the mutual cancellation of cumulative flow error.

关 键 词：超声波流量计 误差 实时计量 固定组分 实时组分 

分 类 号：TE863[石油与天然气工程—油气储运工程]