Stick–Slip Characteristics of Drill Strings and the Related Drilling Parameters Optimization

To eliminate or reduce stick–slip vibration in torsional of the drilling string and improve rate penetration (ROP), a model considering ROP was established based on multidimensional string. The verified by simulation analysis. characteristics three stages stationary, slip, stick were analyzed. This paper investigated influence rotary torque, speed, weight bit (WOB) vibrations drill Based this, relationship between parameters established. Drilling parameter optimization completed for soft, medium-hard, hard formations. Results showed that appropriately increasing torque decreasing WOB can even increase ROP. increased 11.5% soft formation, 13.7% medium-hard 14.3% formation. provides theoretical guidance optimizing different