油水两相流中2种含水率计算模型比较

Comparison of two water-fraction calculation models in oil-water two-phase flow

油水两相流广泛存在于石油开采、储运、化工、能源等工业领域。含水率是油水两相流系统的重要参数之一,含水率的准确测量不仅与采用的测量方法有关,而且还与计算模型有很大关系。结合电导式测量方法建立了电阻-电容并联网络含水率计算模型,并在3种流型下与Maxwell含水率模型进行了仿真和实验对比。结果表明,建立的并联电阻-电容网络含水率模型,在泡状流下与Maxwell含水率计算模型的误差基本相同,而在环状流、分层流下,测试误差均小于Maxwell含水率计算模型的误差,具有更高的测试精度,可适用于环状流、分层流、泡状流等流型。

Oil-water two-phase flow exists widely in oil exploration,storage and transportation,chemical engineering,energy resource and other industrial fields.Water fraction is one of the important parameters in oil-water two-phase system.Accurate measurement of water fraction is related not only to measurement method,but also to calculation model.Using conductance measurement method,a water fraction calculation model was built based on parallel resistance-capacitance network.And the simulation and experiment results are compared with those applying Maxwell calculation model for 3 different flow patterns.Simulation and experiment results show that the measurement errors are basically identical for the parallel resistance-capacitance network model and Maxwell model in bubble flow.While the errors using parallel resistance-capacitance network model are lower than those using Maxwell model in annular flow and stratified flow.Therefore the parallel resistance-capacitance network model has higher precision for water-fraction calculation than Maxwell model and is suitable for annular flow,stratified flow and bubble flow.