How to use the water well drill pipe to achieve the longest life

Classification:

Company News

Release time:

2019-08-14

【Summary Description】 How to use the water well drill pipe to achieve the longest life

水井钻杆

water well drill pipeReject pure fatigue use, first in the process of useThe drill pipe is subjected to cyclic stresses of tension, compression, torsion and bending. In a curved borehole, even if the drill collar has sufficient thickness, fatigue failure may still occur, and the location of the failure is not necessarily the same. When the drill pipe is bent, the corresponding position of the drill pipe will generate periodic stress due to repeated tension and compression for each rotation of the drill pipe. The drill pipe above the drill collar is most likely to be subjected to bending because the drill collar is more rigid and can resist bending, and bending will occur in the drill pipe above the drill collar. The bent kelly will bend the first drill pipe below the rotary table. Once the stress on this drill pipe is large enough, it will cause fatigue damage.

Secondlywater well drill pipenotch fatigue damage, only isThe imperfect surface of the drill pipe, whether it is formed by mechanical processing or metallurgical process, will greatly affect the fatigue limit of the drill pipe, and the degree of influence depends on the location, direction, shape and number of defects. If the notch is located from the jointWithin the range of 50cm, because this part is the drill pipe to produce the largest bending stress, it will become the core of fatigue damage. The longitudinal notch can diffuse stress without harm. However, a score that is even fine, but has a sharp base angle, increases the stress and leads to failure.

water well drill pipeofTemperature,Most corrosion rates increase with increasing temperature.It'sFlow rate,The rate of corrosion is accelerated as the mud flow rate increases.And there'snon-uniformity,Local differences in steel composition or microstructure,will increase the corrosion rate.

high stress,Generally, the corrosion rate is faster in the parts subjected to high stress than in the low stress parts.

Key words:

weilida drill