关于国内抽油机发展趋向的几个问题

Some remarks on developing trend of pumping units in China

对《国内抽油机的发展趋向》所持观点表示异议，认为不是游梁式抽油机而是无游梁式抽油机在国产抽油机中处于主导地位；改进型游梁式抽油机是我国抽油机的一个发展趋向，但不是一种主要发展趋向，而长冲程无游梁式抽油机才是我国抽油机的主要发展趋向。指出被评议的１４种抽油机的换向和平衡机构并不存在返祖趋向。列述了我国抽油机在１６个方面的发展趋势，并讨论了评议抽油机应注意的问题等。

The author raises an objection against the viewpoints put forward in the article,Developing trend of pumping units in China'(CPM, 1995,23(2):49～54), and thinks that it is not beam pumping units but pumping units without walking beam that will play the leading role in China-the operational development of beam pumping units is one of the trends at the moment, but the main trend is developing long stroke pumping units without walking beam. The author also points out that the reversing and counterbalancing mechanisms of the evaluated pumping units cannot be regarded as reverse transformation. In addition, the author expounds the developing trends of pumping units in China from 16 aspects, and discusses the problems worthy of note with pumping unit evaluation.