一、前言 电动潜油离心泵(简称电泵)在我国油田上是一种很有发展前途的无杆泵抽油设备。还是在六十年代初期,在玉门油田和大庆油田都相继进行了电泵的矿场试验。 现场使用表明:电泵在油井中工作时的实际特性和出厂时给出的输水特性差异很大。其主要原因是电泵在油井中所输送的介质是多相混合物。多相混合物中每一相都对电泵的工作带来独特的影响,但是,起决定作用的因素只有两个:一个是液体的粘度(μ液);另一个是在泵吸入处自由气对液体的容积比或称为吸入气液容积比((Q_(气吸))/Q_液或K_吸)。一般来说,上 I. Introduction Electric submersible centrifugal pump (referred to as electric pump) in our country is a very promising oil-free rod pump pumping equipment. Still in the early 1960s, Yumen Oilfield and Daqing Oilfield have carried out the electric pump field test. Field use shows that the actual behavior of the pump when it is being operated in the well varies greatly from that delivered at the factory. The main reason is that the medium delivered by the pump in the oil well is a multiphase mixture. Each phase in a heterogeneous mixture has a unique effect on the operation of the pump. However, there are only two factors that determine the effectiveness of the pump: one is the viscosity of the liquid (μ fluid) and the other is the free-air Volume ratio of the liquid or as inhaled gas-liquid volume ratio ((Q_ (suction)) / Q_ liquid or K_ suction). In general, on