# Maximum Anticipated Wellhead Pressure (MAWHP)

Maximum Anticipated Wellhead Pressure (MAWHP) which equals to Maximum Anticipated Surface Pressure (MASP) for surface wellheads, indicates the maximum internal pressure that the blowout preventer (BOP), wellhead equipment and other related equipment might be subjected to when a blow-out happens (full transfer of formation pressure to well head considering only gas in the wellbore. When preparing for drilling a well, the engineer should know about the MAWHP.

For subsea wellheads, however, MASP does not equal MAWHP.

Reference: Pressure Control for Drilling, Completion and Well Intervention Operations in the Oil Gas Industry, Prakash Bahadur Thapa

### Correlations

- 1- ρgh Method
- 2-Average ZT Method
- 3-Cullender-Smith

### Input Parameters

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

Well True Vertical Depth | 5000 | ft | |||||

Depth Increment Number | 10 | - | |||||

Wellhead Temperature (T_{S}) | 519.67 | °R | |||||

Bottom Hole Pressure (P_{BH}) | 5000 | psi | |||||

Bottom Hole Temperature (T_{BH}) | 639.67 | °R | |||||

Gas Specific Gravity (ɣ_{g}) | 0.8 | SG | Average Surface Gas Gravity (ɣ_{g}) | ||||

Z-Factor Calculation Method | 3 | ||||||

Pseudo Properties Calculation Method | 2 | ||||||

Pseudo Critical Properties Correction Method | 2 | ||||||

N2 Content | 0 | % | |||||

CO2 Content | 5 | % | |||||

H2S Content | 10 | % | |||||

CALCULATE | |||||||

## Results | |||||||

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

1- ρgh Method | 4333.204 | psi | |||||

2-Average ZT Method | 4333.121 | psi | |||||

3-Cullender-Smith | 4367.817 | psi |