天然气作为一种优质能源和化工原料,其计量越来越被人们重视,由于大庆气田开发较晚,在天然气计量仪表的设计选型、使用、安装、维护、管理等方面与国内外有着显著的差距.结合大庆气田天然气计量应用现状,重点介绍了孔板流量计、旋进旋涡流量计、弯管流量计、质量流量计、涡街流量计和超声流量计的原理及特点.从采气分公司应用情况来看,现用的旋进旋涡流量计和孔板流量计就能满足基本计量需要,但随着气田规模不断扩大,现有计量仪表未必能满足未来的计量需求.根据实际生产情况对超声流量计进行了性能和经济方面的评价对比,并通过考察国内其他气田应用超声流量计的效果,考虑是否在输气门站用超声流量计来完成最优计量.%As a kind ofhigh quality energy and chemical raw material,natural gas metering has been paid more and more attention.Due to the late development of Daqing Gas Field,there is a significant gap of the natural gas metering instrument design and type selection,use,installation,maintenance,management and other aspects between China and other countries.Combined with the natural gas metering application current situation in Daqing Gas Field,the principles and characteristics ofthe orifice flow meter,vortex precession flow meter,elbow flow meter,mass flow meter,vortex flow meter and ultrasonic flow meter are mainly introduced.According to the application situation of Gas Production Branch,the existing vortex precession flow meter and orifice flow meter can meet the basic metering needs.But as the gas field continues to expand itsscale,existing metering instruments may not beableto meet future metering needs.In view of the actual production situation,the performance and economic aspects of the ultrasonic flow meter are evaluated and compared.Meanwhile,through investigating the application effect of the ultrasonic flow meter in other domestic gas fields,it is considered that whether the transmission gate station should use the ultrasonic flow meter to complete the optimal metering.
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