Causes and Treatment Methods of Drill Pipe Faults

1. The drill pipe breaks along the threads of the male and female buckles
1) The torque of the drilling rig exceeds the torque that the inclination angle of the drill pipe can bear
2) The radius of curvature of the construction hole exceeds the minimum radius of curvature of the drill pipe
3) When expanding the hole (especially when expanding the hole) or drilling the pilot hole for a long distance, the drill bit suddenly hits a hard object to generate a strong impact. The torque is suddenly large, causing the drill pipe to break or twist.
4) The operator should reasonably control the rotation speed and propulsion force when operating the drilling rig to avoid such situations.
2. The drill pipe body is broken
1) The torque of the drilling rig exceeds the torque that the inclination angle of the drill pipe can bear
2) The radius of curvature of the construction hole exceeds the minimum radius of curvature of the drill pipe
3) When expanding the hole (especially when expanding the hole) or drilling the pilot hole for a long distance, the drill bit suddenly hits a hard object to generate a strong impact. The torque is suddenly large, causing the drill pipe to break or twist.
4) The material and thickness of the drill pipe body do not meet the requirements of the technical specification.
5) The surface of the drill pipe body is severely scratched (more than 1mm in depth and in a spiral shape)
6) The drill pipe has been used for too long, and the surface has more damage, which is close to or exceeds the fatigue life.
3. The friction welding joint of the drill pipe is cracked or broken
1) Welding quality problems
2) Questions in Article 1 and Article 2 shall be dealt with in the same way.
4. The drill pipe body is bent or twisted
1) The thrust is too large and too strong when drilling the pilot hole.
2) The radius of curvature of the guide hole during construction is too small
5. Expansion of the end face of the drill pipe box
1) Different thread types, different manufacturers, new and old drill pipes with large differences are used together, resulting in tight distance exceeding the standard when connecting drill pipes, and expansion of the female thread
2) The buckle type of the protective nipple joint of the drilling rig power head does not match the drill pipe buckle type or the wear is too serious, and the tight distance tolerance is large.
3) The length of the male and female ports is inaccurate, and the double top of the main and auxiliary steps of the joint cannot be realized
4) The radius of curvature of the hole exceeds the allowable radius of curvature of the drill pipe, causing the box to expand
6. Deformation of the end face of the drill pipe box
1) The vise slips are clamped on the female mouth
2) When the buckle cannot be removed due to too much torque, hit it with a sledgehammer or bake it with fire to cause deformation.
7. Drill pipe buckle damage
1) Qualified thread thread oil is not used.
2) The surface of the threaded button is not cleaned
8. The surface of the male and female joints of the drill pipe is seriously damaged
1) The quenched and tempered hardness of the vise slips is too large, and they are pinched by the vise slips.
2) Joint heat treatment, nitriding hardness or material problems.
3) The joint is hit by a sledgehammer or roasted by fire due to difficulty in unfastening.
Please avoid or replace if possible.