螺杆泵输送掺稀稠油性能的现场测试

Field test on transporting diluted heavy oil by screw pump

螺杆泵经过多年的使用，零件出现不同程度的磨损。为了探究螺杆泵特性曲线发生的变化，有必要对泵性能曲线进行测试校核。根据相关规范，对某原油管道泵站的螺杆泵开展了现场试验，获得了该螺杆泵输送掺稀稠油时的流量-压差和效率-压差特性曲线。基于螺杆泵出厂时的不同运动黏度下的流量-压差、功率-压差性能曲线和现场试验结果，利用线性插值方法得到试验油品对应运动黏度下螺杆泵的出厂性能曲线。螺杆泵的实测性能曲线与出厂性能曲线对比结果表明，使用多年的螺杆泵，效率出现不同程度的降低，下降幅度在1.1％-14.0％之间；在相同压差下，螺杆泵流量也有所损失，下降幅度在3.7％～15.6％之间，且随着压差增大，流量下降幅度增大。现场测试得到的螺杆泵性能曲线可为今后该原油管道输送掺稀稠油的工艺计算和能耗分析提供依据。（图11，表7，参10）

Over years of service, parts of screw pump are worn to certain extent. In order to identify the variation of screw pump＇ s characteristic curve, it is necessary to test and check the pump performance curve. As per relevant specifications, field test was conducted on the screw pump in a pump station of a crude oil pipeline, and the flowrate-differential pressure and efficiency-differential pressure characteristic curves formed at the time of transporting diluted heavy oil by screw pump were obtained. Based on the ex-factory flowrate-differential pressure and power-differential pressure performance curves of the screw pump for different viscosities as well as the results obtained from field test, the linear interpolation method was used to obtain the ex-factory performance curves of the screw pump at the viscosity corresponded by the test oil. The correlation results of measured performance curves and ex-factory performance curves of the screw pump show that, for a pump used for many years, its efficiency reduces by 1.1%-14.0%, moreover, at the same differential pressure, the flowrate also losses, possibly by 3.7%-15.6%, and as the differential pressure increases, the flowrate declines more largely. The screw pump performance curves obtained in field test can provide bases for the technologic calculation and energy consumption analysis for transporting diluted heavy oil by this crude oil pipeline in the future. （11 Figures, 7 Tables, 10 References）