The department introduced a online repair technology can repair damaged side carbon block, which has the important significance to extending the pot life and reduce the overhaul cost.

By applying the theory of reliability to the analysis of the life distribution and operating cost of car axle, the model of economical policy decision about repair cycle of car axle is set up.

So, formulating standards for repairing used oil tubes is the fundamental approach to improving repair quality to extend the service life of tubes and reduce the cost of oilfield production.