The static stress is tested on the type of SG5291JXJ40t workover derrick with peak load and the dynamic stress is tested within rated load to find the dynamic load factor by electrometric stress-test.

And taking magnetic particle inspection results of one downhole services company s three workover masts as examples,the characters of defects were analyzed.

Design of multi-axle steering drive mechanism of workover rig;

Design of hydraulic workover rig;

Sum confused questions on the design and application of drilling rig and workover rig——Special topic Sec Ⅷ;

Application of China offshore workover rig;

According to China\'s application and development of workover machinery, the new mechanized workover system came into being, with the objective of making the workover operations safe and clean, automated fully.