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 principle of improving conventional pumping units was introduced.

The principle of improving conventional pumping units was introduced, according to the general design methods, the design of main assemble structure, such us horse head, walk beam, equalizer, pitman, crank, base and Samson post etc, was improved; the calculation of strength of improved assemble, such as walk beam, pitman and equalizer etc, was checked.

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;

Aimed at the disadvantages of the polished rod sealing device of beam pumping units, such that it has not adjusting function with one heart, is not convenient for the replacing of the sealing rings, and has complicated avoid-ejecting structure, a new sealing device was presented.