# Hydrostatic Pressure Decrease Due to Pipe Pullout from Hole

When pulling pipe out of a wellbore, the hydrostatic pressure decreases due to the volume of steel being removed from the hole.

The wet pipe is when filled with mud, while the dry pipe system is when only the volume of steel is encountered and the fluid inside the pipe is assumed to be air.

In this page, the user can calculate the hydrostatic pressure loss due to the reduction of drilling mud level in the hole by entering the amount of drilling pipe pulled out.

### Correlations

- Hydrostatic Pressure Decrease

### Input Parameters

Name | Input Value - Unit | Converted Value | Validity | Link to Calculation Page | |||
---|---|---|---|---|---|---|---|

Pulled Out Pipe Type | 1 | ||||||

Number of Stands Pulled Out | 5 | - | |||||

Average Length per Stand | 92 | ft | |||||

Pipe Displacement | 0.0075 | bbl/ft | |||||

Casing Capacity | 0.0773 | bbl/ft | |||||

Pipe Capacity | 0.01776 | bbl/ft | |||||

Mud Weight | 11.5 | lb/gal - ppg | |||||

CALCULATE | |||||||

## Results | |||||||

Correlation | Calculated Value | Warnings | Remarks | ||||

Hydrostatic Pressure Decrease | 29.56 | psi |