Formation Pressure Calculator

Formula

The formula to calculate the Formation Pressure (FP) is:

\[ FP = HSPM + HSPI + SICP \]

Where:

\( FP \) is the Formation Pressure (psi)
\( HSPM \) is the hydrostatic pressure of the mud in the annulus (psi)
\( HSPI \) is the hydrostatic pressure of the influx (psi)
\( SICP \) is the shut-in casing pressure (psi)

Definition

Formation Pressure (FP): The pressure within a geological formation.
Hydrostatic Pressure of the Mud in the Annulus (HSPM): The pressure exerted by the column of mud in the annulus.
Hydrostatic Pressure of the Influx (HSPI): The pressure exerted by the influx fluid.
Shut-in Casing Pressure (SICP): The pressure measured at the casing head when the well is shut in.

Example

Let's say the hydrostatic pressure of the mud in the annulus (HSPM) is 1000 psi, the hydrostatic pressure of the influx (HSPI) is 500 psi, and the shut-in casing pressure (SICP) is 200 psi. Using the formula:

\[ FP = 1000 + 500 + 200 = 1700 \]

So, the Formation Pressure (FP) is 1700 psi.