气田井口锥形孔板气液两相流量计的研制

Development of wellhead V-cone orifice gas/liquid flowmeter for gasfields

为解决苏里格气田井间串接、井口带液计量模式下无法计量单井产液量的问题,在孔板差压噪音测量气液两相流理论的基础上,建立了计量模型中经验常数关系数据库,结合锥形孔板及整流器的应用情况,研制了锥形孔板气液两相流量计。流量计由锥形孔板、整流器、一体化仪表、温度传感器、计量直管段等组成,通过测量50次/s差压波动信号的相对方差,利用差压噪音测量模型及经验常数关系数据库,得出气液两相流量。石油工业计量测试研究所实流测试与气田现场比对试验结果表明:该流量计气相计量误差小于5%,液相计量误差小于20%,计量精度满足现场生产需求,已在长庆气田应用150余套。

In Sulige Gasfield, channeling often occurs between wells, and fluid productivity in a well can not be measured if fluid exists at wellhead. To solve these problems, according to the theory of metering for gas/liquid two-phase flows by using differential pressure noises of orifice, the database for correlation of empirical constants is established for metering model. With consideration to application of V-cone orifices and rectifiers, the V-cone orifice gas/liquid flowmeter is developed. The flowmeter includes V-cone orifice, rectifier, integral instruments, temperature sensor and straight metering pipe section. Gas/liquid flow rates are determined through measuring of relative variance of differential pressure fluctuation signals with frequency of 50 cycles/s, metering model and database for correlation of empirical constants for differential pressure noises. Comparison between tests performed by Metering Research Institute of Petroleum Industry and field application show that the flowmeter has errors less than 5% for gases and less than 20% for liquids. With accuracies satisfactory to actual operation, over 150 packages of these flowmeters are deployed in the Changqing Gasfleld.