tubingless meaning in Chinese

不下油管的

Field use shows that the new tubingless oil production unit has the advantages of high pump efficiency , low cost and easy operation
现场使用情况表明，新型无油管采油装置具有泵效高、投资少及作业方便等优点。
Abstract : a new tubingless oil production unit is developed in the light of the shortcomings of the commonly - used tubingless oil production unit
文摘:国内常用的无油管采油装置在使用过程中易造成泵砂埋或泵下移，影响正常作业。