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

NameInput Value - UnitConverted ValueValidityLink to Calculation Page
Well True Vertical Depth

5000

ft

Depth Increment Number

10

-

Wellhead Temperature (TS)

519.67

°R

Bottom Hole Pressure (PBH)

5000

psi

Bottom Hole Temperature (TBH)

639.67

°R

Gas Specific Gravity (ɣg)

0.8

SG

Average Surface Gas Gravity (ɣg)
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

CorrelationCalculated ValueWarningsRemarks
1- ρgh Method4333.204psi
2-Average ZT Method4333.121psi
3-Cullender-Smith4367.817psi