This formula is used to calculate formation pore pressure or simply formation pressure if we know hydrostatic pressure in drill string and SIDPP. Formation pressure is the sum of the hydrostatic pressure in drill string and SIDPP.

The formula for formation pore pressure is:

4. |
FORMATION PORE PRESSURE (psi) |
Hydrostatic Pressure in Drill String (psi) + SIDPP (psi) |

Practice problems for formation pressure:

Q1. Find the formation pore pressure if the hydrostatic pressure is ___ psi and SIDPP is ___ psi.

Q2. Find formation pressure at a TVD of ___ ft when SIDPP is ___ psi and mud weight in use is ___ ppg.

Q3. Find formation pressure at a TVD of ___ ft if SIDPP is ___ psi and mud gradient is ___ ppg.