Horizontal stress is crucial in geomechanics as it affects wellbore stability, hydraulic fracturing, and reservoir pressure management.
- Depth (D): The depth at which the stress is being calculated. It can be entered in meters or feet.
- Depth Unit: Choose between meters (m) or feet (ft). The calculator will automatically convert feet to meters.
- Pore Pressure (Pf): The pressure exerted by fluids within the rock pores, measured in MPa.
- Normal Pore Pressure (Pf,n): The expected pore pressure under normal conditions without abnormal pressure influences.
- Enter the depth and select its unit (meters or feet).
- Input the pore pressure and normal pore pressure in MPa.
- The calculator uses the Breckels and van Eekelen model to estimate horizontal stress.
- If the depth is in feet, it is converted to meters.
- The output is displayed in MPa and psi.
- If depth is **less than 3,500 m**, the formula applies a power function to depth and adjusts it based on the pressure difference.
- If depth is **greater than 3,500 m**, a linear function of depth is used along with pressure adjustments.
Suppose depth is 2,500 m, pore pressure is 40 MPa, and normal pore pressure is 35 MPa. The calculator estimates horizontal stress and provides values in MPa and psi.