Borehole torsion - Cylindrical helical method
Input(s)
\(\mathrm{k}_{\mathrm{h}}\): Horizontal Curvature (degree/100ft)
\(\mathrm{k}_{\mathrm{v}}\): Vertical Curvature (degree/100ft)
\(\mathrm{k}\): Curvature of Wellbore Trajectory (degree/100ft)
a: Inclination Angle (degree)
Output(s)
t: Borehole Torsion-Cylindrical Helical Method (degree/100ft)
Formula(s)
\[
\mathrm{t}=\mathrm{k}_{\mathrm{h}} *\left(1+\left(2 * \frac{\left(\mathrm{k}_{\mathrm{v}}\right)^{2}}{\mathrm{k}^{2}}\right)\right) * \sin (\mathrm{a}) * \cos (\mathrm{a})
\]
Reference(s)
Samuel. E Robello. 501 Solved Problems and Calculations for Drilling Operations. Sigma Quadrant. 2015. Houston, Texas, Page: 84.