摘要
针对现场超声波流量计检定结果存在较大误差的问题,基于流量计计量原理,确定了气体温度、环境温度、流体速度、气质组成和管道直径等因素均会对计量结果的稳定性造成影响;基于CFD模拟方法,分析了不同工况对流场修正系数的影响,对示值进行了二次校正,从系统误差和随机误差的角度消除误差,并进行了现场结果验证。结果显示:流速越高、甲烷摩尔含量越大,流场修正系数之间的相对误差越小,越有利于提高计量结果的准确性;入口温度与环境温度之间的温差较大时,计量结果的误差会增大;误差修正后,不满足检定要求的流量计重新检定结果均符合标准要求,年输差量可减小5886.7~18396 m^(3),买方或卖方年减小经济损失8830~27594元,补偿效果良好。
In view of the problem of large errors in the verification results of on-site ultrasonic flowmeters,based on the metering principle of the flowmeter,it is determined that gas temperature,environment temperature,fluid velocity,temperament composition and pipe diameter will affect the stability of measurement results.Based on the CFD simulation method,the influence of different working conditions on the flow field correction coefficient is analyzed.The indicated values are corrected twice,the errors are eliminated from the angle of systematic error and random error,and the field results are verified.The results show that the higher the flow velocity gets and the larger the methane molar content is,the smaller the relative error between the flow field correction coefficients gets,which is more beneficial to improve the accuracy of measurement results.When the temperature difference between the inlet temperature and the environment temperature is large,the error of the measurement results will increase.After error modification,the reverification results of flowmeters that do not meet the verification requirements meet the standard requirements,the annual transmission difference can be reduced by 5886.7 m^(3)~18396 m^(3),the buyer or seller can reduce the annual economic loss of 8830 yuan~27594 yuan,and the compensation effect is good.
作者
杨静楠
YANG Jingnan(No.3 Oil Production Plant of Daqing Oilfield Co.,Ltd.)
出处
《石油石化节能与计量》
2025年第9期98-103,共6页
Energy Conservation and Measurement in Petroleum & Petrochemical Industry
关键词
超声波流量计
误差
流场修正系数
检定
输差
ultrasonic flowmeter
error
flow field correction coefficient
calibration
transmission difference
作者简介
杨静楠,工程师,2012年毕业于东北石油大学(电子信息工程专业),从事油气田地面工程相关工作,0459-5861570,yangjingnan528@petrochina.com.cn,黑龙江省大庆市萨尔图区拥军西路12号大庆油田第三采油厂工艺研究所,163000。
