Failure Forms And Causes Of Drill Pipe Body-2

Failure Forms And Causes Of Drill Pipe Body-2

Reasons for failure of drill pipe bodyDrill Pipe :

1. Although the wall thickness of the thickening transition area is increased, it is still a weak part. Because in drilling construction, the drilling fluid is easy to form eddy currents in the thickening transition area of 0-600mm between the drill pipe joint and the body, which leads to the failure of the body due to leakage.

2. The slip area is often bitten by the slip when drilling, and it is easy to be bitten locally after long-term use, thereby inducing the occurrence of leakage and fracture.

3. The influence of regional pressure difference during drilling The factors that cause drill pipe failure are often not single, but the comprehensive effect of multiple factors.

In particular, its use process is more complicated and the impact is more obvious.

The impact of on-site operation: First, the torque does not meet the specified standard when tightening the drill pipe thread, so that the quality of the thread connection cannot be effectively controlled. When the torque value is greater than the specified standard value, it is easy to cause thread expansion accidents and thread bonding accidents; when the torque value is less than the specified standard value, it is easy to cause secondary threading

And the formation of thread expansion accidents and thread leakage and fracture accidents. When connecting a single drill pipe, the surface of the drill pipe thread is not cleaned and is attached with sand, iron cuttings and other debris. Therefore, when tightening the drill pipe thread, it is very easy to cause thread adhesion, leakage and fracture accidents. The torque adjustment of the hydraulic tongs is too large, which is very easy to bite the drill pipe joint, resulting in large bite marks on the joint surface, reducing the strength of the drill pipe joint, and easily causing leakage or fracture of the drill pipe joint. The clamping position of the hydraulic tongs is incorrect, and it is clamped to the drill pipe body, which is very easy to cause damage to the drill pipe body, which is easy to cause leakage or fracture of the drill pipe body. When using or applying thread sealing grease, the method used is improper.