It analyzes reconstruction method of using steel bracket to support roofing system instead of column and removing original bearing column from both design and construction aspects,by introducing the example of supporting frame and removing column.

Column-removed Retrofit Design and Construction of an One-storey Workship Factory;

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.