关键词: 井下螺旋轴流式混抽泵, 轴向力, 平衡结构, 双外壳平衡管, 平衡鼓, 平衡效果

Abstract:

The formation mechanism of the axial force in the down-hole helico-axial multiphase pump were analyzed. On the basis of the balancing drum technology used in the ground vane pump, a new kind of structure called “double-shell balance pipe and balance drum” for balancing axial force was made up. The balance effect of the new structure is better than that of the common axial force balancing structure. The experimental study on the feasibility of the new structure showed that the new structure could decrease the axial force by 85% to 95% and effectively extend the working life of bearings. This new kind of structure can provide an effective way for balancing the axial force of down-hole pump with a large axial force and also give a foundation for design and usage of the large axial force pump.

Key words: down-hole helico-axial multiphase pump, axial force, balancing structure, double-shell balance pipe, balance drum, balance effect