What difficulties will be encountered in the drilling process of the outer flat drill pipe and joint

Classification:

Company News

Release time:

2019-08-14

【Summary Description】 What difficulties will be encountered in the drilling process of the outer flat drill pipe and joint

外平钻杆

OneVibration, bending and wear

(Outer flat drill pipe)When the drill string reaches the critical speed, the drill pipe will vibrate. This vibration will often cause the drill pipe to bend, excessive wear, rapid damage and fatigue failure. In particular, the drill pipe has two types of vibration (node vibration and spring pendulum vibration) when the most unfavorable. The critical speed varies with the length of the drilling tool, the size of the drilling tool, the size of the drill collar and the size of the borehole.

II. Tensile failure

Tensile failure often occurs in the process of lifting the stuck drill pipe. When the lifting force exceeds the yield point, at the weakest part or the smallest section of the drill pipe wall, it will occur"Thin neck”Deformation.(Outer flat drill pipe)If the pull-up force exceeds the limit strength just now, the drill pipe willWillwas pulled off. Tensile failure generally occurs in the upper part of the drill string. Because the upper drilling tool has to bear both the pressure and the weight of the drill string.

Three. Fatigue damage

Fatigue failure is the most common failure of drill pipe.

The next article is introduced.Outer flat drill pipeSeveral types of fatigue damage!

Key words:

weilida drill