Products between electrodes are wiped off completely by micro-helix pump effects which formed during the turning of the helix grooves,thus greatly improving ECM efficiency,accuracy and stability.

Influence of resonance on the partial abrasion of rod string in screw pump well;

Dynamics analysis on partial abrasion and fracture of driving rod in screw pump wells;

According to the energy loss of every part of screw pump well,established system efficiency analysis model for the well.

Study of screw pump well fault diagnosis based on BP neural network;

Research on fault intelligent diagnosis for screw pump drive units;

Development and application of testing apparatus for surface drive screw pump wells;

The variable frequency pumping-off prevention accessory technology for progressive cavity pump well includes variable frequency pumping-off prevention control technology and big-stage progressive cavity pump technology.

Finite element modal analysis of ground driving system for progressing cavity pump;

Research on progressing cavity pump lifting technique for shallow directional well;

The twisting vibration characteristic analysis of the sucker rod string for progressing cavity pump oil production system;