微温差法测量输油泵效率的误差分析

Error Analysis for the Efficiency Field-test of Pump with Temperature-differential Method

微温差法是现场测量输油泵效率的方法 ,但是采用其测得的结果误差较大。根据误差理论 ,分析了出口压力表、密度计、温差仪的准确度和进出口温度计的安装误差对测试结果的影响因素 ,指出在输油泵的效率测试中 ,油品密度的测量误差对测试结果的影响不能忽略。为了保证输油泵效率的测量结果数据准确可靠 ,必须减少进出口温度计的安装误差 ,以及减少出口压力表。

Temperature-differential method is one of the two methods to field-test the efficiency of pump in oil transportation system. Based on the error theory,this paper analyzes the main factors to influence the test results,that is,the accuracy of the outlet pressure gauge,densimeter and temperature-differential meter as well as the errors of installment of the inlet and outlet thermometers. It comes to the conclusions: (1) unlike water-flooding pump, the measurement error of the oil density cannot be neglected in efficiency fieldtest of the pump; (2) when the inserting length of the cannula of thermometers is not deep enough,the errors of installment of the inlet and outlet thermometers are the main factors to influence the measurement result of the efficiency of the water-injection pump and (3) in order to decrease the measurement errors in the efficiency field-test of pump, the accuracy of the outlet pressure gauge, densimeter and temperaturedifferential meter must be increased,and the depth of the cannula of thermometers mustt be ensured.