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What are the main corrosive agents of oil drill pipe steel?

As long as the drill pipe through the drilling bend, even if the tension is eliminated, the accumulation of fatigue damage still exists, so if repeated several times through the drilling bend, it is possible to cause fatigue damage to the drill pipe. It should also be seen that a drill pipe may have been damaged even if there is no accident in a certain well. Therefore. When it is used again in the same well or other wells, although it is connected to the top of the drill string, even if the bending stress acting on the drill pipe is within the rated value, it may not be able to withstand it, resulting in accidents.

What should be paid attention to for daily maintenance of weighted drill pipes?

1, the cleaning part adopts a closed protective structure, the environment is clean, to ensure safety. 2. The external cleaning of sucker rod adopts inclined roller to rotate forward, frequency conversion speed regulation, rotation and propulsion speed can be adjusted. 3, the use of PLC detection and control system, manual and automatic two control methods (can be designed according to user requirements). 4. The external cleaning of the weighted drill pipe adopts intermediate frequency induction heating to the outer surface of the pipe, which is cleaned by a rotating steel brush, rinsed with clear water at the same time, and then derusted through a derusting box. The heating temperature of the pipe surface is controllable and adjustable, and is not affected by the seasonal temperature. The cleaning and derusting effect is completed at the same time.