节流式与涡街式流量计组合测量气田湿气的方法

Method for measurement of wet gas in gas field by combining throttle flowmeter and vortex flowmeter

针对苏里格气田井间串接、井口湿气计量工艺模式下单井无液相计量的问题,提出了节流式流量计与涡街式流量计组合测量湿气气液两相流量的方法。通过将两种流量计测量管集成,再加上差压静压、频率温度集成式传感器,简化了流量计整体结构。采用室内空气-水两相流实验平台对该组合式湿气流量计的计量精度进行测试表明:当瞬时液量为0.05~4 m^(3)/h时,组合式湿气流量计气相、液相测量误差分别在5%、20%以内。采用分离计量装置在气井井口对组合式湿气流量计计量精度进行测试表明:泡排气井气相、液相测量平均误差分别在5%、20%以内,能够准确反映气井出液规律,可为泡排加注制度优化提供指导;柱塞气举井气相测量误差在8%以内,液相测量误差较大,但能够准确反映柱塞气井出液特征,测试结果可为柱塞气井工况诊断及生产制度优化提供依据。

In order to solve the problem of single well without liquid phase measurement in Sulige Gas Field under the process mode of interwell series connection and wellhead wet gas measurement, a method of combining throttle flowmeter and vortex flowmeter to measure wet gas-liquid two-phase flow was proposed. The overall structure of flowmeter was simplified by integrating two kinds of flowmeter measuring tubes and adopting differential pressure static pressure, frequency and temperature integrated sensors. The indoor air-water two-phase flow experimental platform was used to test the measurement accuracy of the wet gas flowmeter. The results show that when the instantaneous liquid volume is 0.05-4 m^(3)/h, the gas and liquid measurement errors of the combined wet gas flowmeter are within 5% and 20% respectively. The measurement accuracy of the wet gas flowmeter was tested at the wellhead of the gas well by using the separation metering device. The results show that the average error of gas and liquid phase measurement in the bubble exhaust well is less than 5% and 20% respectively, which can accurately reflect the liquid production law of the gas well and guide the optimization of the bubble discharge and filling system;the gas phase measurement error in the plunger gas lift well is less than 8%, and the liquid phase measurement error is large, but it can accurately reflect the liquid production characteristics of the plunger gas well, which could provide the basis for working condition diagnosis and production system optimization of plunger gas well.