There are many kinds of pumping units. I don't know what kind of pumping unit you are referring to. Generally speaking, the beam pumping unit has the advantages of little technical difficulty, strong adaptability, convenient maintenance and long service life. The main technical difficulty lies in the gearbox, which is usually produced by a specialized manufacturer and then assembled by the pumping unit manufacturer. The older manufacturer of gearbox is Lanzhou Petroleum Machinery Factory, and its quality is guaranteed.
There are many manufacturers of pumping units, such as Henan Oilfield Petroleum Machinery Factory and Karamay Oilfield Petroleum Machinery Factory. And the quality is guaranteed. However, the technology of chain pumping unit is complex and its field application is not extensive. Generally, all kinds of pumping unit manufacturers do not regard it as the main product.