Drill string check and inspection

Abstract

The drill string is the tubular string connecting the bit to the surface assembly, which is exposed to increasing stress (temperature, pressure, rotation, load, lifting, etc.) as the depth of hydrocarbon exploration and development and geothermal drilling increases. Drill string failure (fracture, puncture, slippage, etc.) is considered a serious technical accident that hinders the deepening of the borehole and, in the worst case, makes it impossible. Therefore, it is very important to periodically check and inspect the drill string to avoid or minimize drill string failure.