Review Article

A Review of the Evaluation, Control, and Application Technologies for Drill String Vibrations and Shocks in Oil and Gas Well

Table 4

Torsional vibration level classification.

LevelStick-slip (/r/min)StateLimit time

Low0~40Torsional vibrationNo
Medium40~60No
Medium60~80Suggest reducing vibration
High80~100Stick-slipCompletely, must reduce vibration
Severe>100Stick-slip30 minutes, immediately reduce vibration