8—73HF/B-type hetero-beam oil extractor, the contents of the transformation include reducing the mass of the rear balance weight under the precondition that the moment of the rear balance weight of the beam doesn't change; the rear balance weight after the transformation has the single welding structure through the bolt connection and welding struc.

In consideration of the characteristics of complex calculation for geometric parameters of extraordinary walking-beam pumping units, a simple method, that is counter-calculating method for calculating its geometric parameters, is proposed.

Owing to its excellent performance, special beam pumping units(also called as two horsehead pumping units) is widely used in oil fields at present.

A workable approach to rational driving and energy saving of beam pumping unit;

The attempt of transforming conventional beam pumping unit into inclined well pumping unit;

Most oil field in China has gone into interim period or late period of development, the lifting costs increase, saving energy problem in beam pumping unit was regarded in improving oil production.

The reformation and application of two-times-balance technique in beam-pumping unit;

Study on driving beam-pumping unit by alternating servo motor;

A variable voltage variable frequency(VVVF) control device for beam-pumping unit was developed.

Multi-body dynamic analysis on motion laws of beam pumping unit;

Characteristics of beam pumping unit and rotation changeable pumping unit by friction;