Definition - What does Bending Stress mean?
Bending stress is the normal stress that an object encounters when it is subjected to great amount of load at a particular point causing it to bend and fatigue. It is encountered in many applications of the oil and gas industry; however, they are more often encountered on the drill pipe of a rig while drilling oil or a gas well through harsh rock bed structure.
Petropedia explains Bending Stress
When a rig starts drilling in a rotary position using a drill pipe, a lot of heat and backward forces are generated which a drill pipe takes on; hence the drill pipe has to be checked on regularly for fatigue at various locations.
The common locations where a drill pipe can undergo bending stresses are:
- The buckled area near the rig end.
- The dogleg
- The buckled area on the other end of the drill pipe.
The maximum bending stress on a drill pipe is experienced in the doglegs while drilling a well hole.