几家主要石油公司曾经做过前置式旋转曲柄平衡抽油机(图1)和各种普通游梁式抽油机(图2)的现场对比试验。试验的方法通常是:在一口给定的井上使用一种类型抽油机工作若干天,然后用另一种类型抽油机工作同样长的时间。试验过程中,将日产量、耗电量和 Several major oil companies have conducted on-site comparative tests of front-mounted rotary crank balance pumping units (Figure 1) and various conventional beam pumping units (Figure 2). The test is usually done by using one type of pumping unit for a given number of days on a given well and then for the same length of time using another type of pumping unit. During the test, the daily output, power consumption and