Maximum compression at vertical wellbore

Input(s)

$\sigma_{c}$: Minimum Principle Stress (psi)

$S_{w}$: Intact Rock Strength (psi)

$\mu$: Internal Friction of Weak Bedding $(\mathrm{cP})$

ß: Angle of Weak Plane to Maximum Principle Stress (degrees)

Output(s)

$\sigma$: Stress $(\mathrm{cm} / \mathrm{s})$

Formula(s)

$$ \sigma=\frac{\sigma_{\mathrm{c}} * 2 *\left(\mathrm{~S}_{\mathrm{w}}+\mu * \sigma_{\mathrm{c}}\right)}{(1-\mu * \cot (\beta)) * \sin (2 * \beta)} $$

Reference(s)

Mark D. Zoback, Reservoir Geomechanics, Cambridge University Press, UK, Page: 107.