In this paper,a flow meter error compensation method for underground stratified water injection in Yanchang oilfield was proposed.According to the flow meter measurement principle,the measured value of the flow meter was obtained and the flow meter display value correction was completed on this basis.For the flow meter error caused by temperature and fluid state,the decoupling process of temperature and fluid state was carried out,including having a multiple linear regression model designed to analyze the relation-ship between multiple temperature dependent variables and measured values so as to obtain the estimation value of optimal compensation coefficient.Through having the coefficient vector put into the output signal's multiple linear regression equation obtained according to the multiple linear regression model,and the flow value after temperature compensation was obtained,including having Reynolds number based to obtain the state of water injection fluid to define both upper critical velocity and lower critical velocity,and having the calculation method of compensation coefficient designed to complete error compensation.The experimental results show that,the method proposed improves the measurement accuracy of the flow meter after error compensation.
关键词
流量计/示值校正/误差补偿/多元线性回归模型/流体状态/井下分层注水
Key words
flow meter/indication correction/error compensation/multiple linear regression model/flow state/downhole stratified water injection
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