Normal drilling, with drilling shock device working time to meet the requirements below, should be recycled repair.

Temperature above 190 ℃, work 240 hours;

Temperature for (150~190) ℃, work 500 hours;

1.3 Temperature below 150 ℃, work 720 hours;

Normal drilling, while drilling shock device does not meet the specified time, but the heavy shock operation or drilling found that there is bending deformation, both ends of the thread does not meet the relevant provisions, should be recovered and repaired.