New Analysis Theory and Method for Drag and Torque Based on Full-Hole System Dynamics in Highly Deviated Well

Table 1

Parameters used in the simulations.

= 0.33	Poisson’s ratio of the wall rock	WOB = 6	Weight on bit (ton)
= 0.3	Poisson’s ratio of the drill string	= 70	Angular velocity (rad/s)
= 51.5 10^9	Elastic modulus of the rock (N/m^2)	= 7860	Drill string density (kg/m^3)
= 210 10^9	Elastic modulus of the drill string (N/m^2)	= 7.6923 10^10	Shear modulus (N/m^2)
= 6.57 10^11	Resistance coefficient (N/m)	= 0.1–0.4	Sliding friction coefficient
= 1.56 10^6	Damping coefficient (N·s/m)	= 0.1–0.4	Tangential friction coefficient