抽油机井举升能耗影响因素统计分析

Statistical analysis of factors affecting lifting energy consumption in pumping wells

为了继续做好抽油机井节电工作,开展抽油机井耗电量影响因素统计分析研究。运用数理统计方法计算百米吨液耗电的置信区间,得出当平衡度在90%~105%时,百米吨液耗电置信水平为0.9的置信区间(E3)更合理。同时,拟合不同机型抽油机井的百米吨液耗电数值,将大功率电动机更换为较小功率电动机后,功率因数得以提高,说明将抽油机井的能耗定额表作为能耗优化是可行的,输油干线回压每升高0.1MPa,每天多消耗电能为3.85kW·h,造成更多电能浪费。将抽油机平衡度标准制定为90%~105%是合理的,在运用数理统计方法的同时兼顾电动机功率,可做到更合理的机电匹配,而原油黏度导致单井回压升高会直接增大抽油机单井日耗电。该研究可为抽油机井节能管理提供依据,也可为同类型研究提供借鉴。

In order to make use of power saving in pumping wells,the statistical analysis of factors affecting power consumption in pumping wells has been carried out.The confidence level of 100-meter per ton liquid power consumption is 0.9 in the confidence interval(E3)is more reasonable when the balance degree is between 90%and 105%,by using mathematical statistics method to calculate the confidence interval of 100-meter per ton liquid power consumption.At the same time,by fitting the 100-meter per ton liquid power consumption in different pumping wells and replacing the high-power motor with the lower-power motor,the power factor has been improved,indicating that the energy consumption quota table taken as the optimization of energy consumption was feasible in pumping wells.Every 0.1 MPa increase of the back pressure in the oil pipeline consumes an additional electricity of 3.85 kW·h per day,which could result in more energy waste.It is reasonable to set the balance degree standard of pumping unit as 90%~105%.By using mathematical statistics and considering motor power,it can achieve more reasonable electro-mechanical matching.However,the increase of single well back pressure caused by crude oil viscosity will directly increase the daily power consumption in pumping unit.The study can provide a basis for energy-saving management of pumping wells and also provide reference for similar research.