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美国Harbison-Fischer公司开发成功一种有专利权的重质油砂层采油的有杆泵。它采用串联的2个柱塞,其下部的压力密封金属喷涂柱塞前沿可将产液中的砂子分离出来,消除柱塞和泵筒间的磨损;而其上部的软密封柱塞无压力通过,这样砂子就不会对它造成磨损。因此可很好发挥每个柱塞的作
United States Harbison-Fischer company successfully developed a patented heavy oil sand lever pump. It uses a series of two plungers, the lower part of the pressure seal metal spray plunger front can be produced in the sand isolated from the plunger and pump barrel to eliminate wear and tear; and its upper soft seal plunger without pressure through So that the sand will not wear it. So can play well for each plunger