To fish the lost sucker rod with severe bending and radial distortion,a new type of bending fishing tool was developed.

The status quo and trend of sucker rod development in China;

Thermal spraying wear-resistance layer onto material surface of sucker rod;

Upset forging die design of cylindrical ribwork sucker rods;

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

Dynamics analysis technology for rod string of surface driving screw pump and its application in Daqing Oilfield;

This paper adopted fluid-solid coupling analysis method,and took the rod string,the well fluids and the oil tube as research objects,well fluids are assumed to be Newtonian fluids.

The abrasion mechanism and cause analysis for straight well rod string;

The dynamics simulation of rotating rod string in well bore;

A three-dimensional dynamic simulation model of rod string in actual borehole was established based on the characteristics of actual well track and system dynamics theory.

Prediction of serious abrasion position and mechanism of uneven abrasion between sucker rod string and tubing;

Velocity distribution model of annular flow and computing model of liquid friction of the sucker rod string were established according to constitutive equation and momentum conservation equation of the power law fluid of polymer flooding rod pumping systems.

According to working characteristics of a surface driving screw pump system,torsion load and axial force of sucker rod string which is analyzed and calculated in this article.