Wellbore Genius
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Well calculator — hydrostatic, BHT & depth profile
Enter the well basics on the left. Results update live with each calculation step shown so you can audit the math for your own wells.
Well inputs
Units shown in brackets follow the active system (Field). Toggle in the header.
100 – 40,000 ft
8.0 – 20.0 ppg
−40 – 150 °F
0.5 – 5.0 °F/1000 ft (typ. 1.5–1.8)
Wellhead injection / annulus pressure (0 if none)
Hydrostatic pressure
5,928 psi
Bottomhole pressure
5,928 psi
Bottomhole temperature
94.2 °F
Step-by-step calculation
Formulas use field-unit identities (industry standard). The result line also shows the converted value in field units.
1Pressure gradient from mud weight
grad [psi/ft] = 0.052 × MW [ppg]
= 0.052 × 9.50
= 0.4940 psi/ft
2Hydrostatic pressure at TVD
P_hyd [psi] = grad × TVD
= 0.4940 × 12,000
= 5,928 psi
3Bottomhole temperature (geothermal)
BHT [°F] = T_surf + (gradient × TVD) / 1000
= 75 + (1.60 × 12,000) / 1000
= 94.2 °F
4Bottomhole pressure with surface pressure
BHP [psi] = P_hyd + P_surf
= 5,928 + 0
= 5,928 psi
5Equivalent mud weight (EMW) at TD
EMW [ppg] = BHP / (0.052 × TVD)
= 5,928 / (0.052 × 12,000)
= 9.50 ppg
Depth profile
Hydrostatic pressure and temperature from surface down to 12,000 ft.
| Depth [ft] | Hydrostatic [psi] | With surface P [psi] | Temp [°F] |
|---|---|---|---|
| 0 | 0 | 0 | 75.0 |
| 1,200 | 593 | 593 | 76.9 |
| 2,400 | 1,186 | 1,186 | 78.8 |
| 3,600 | 1,778 | 1,778 | 80.8 |
| 4,800 | 2,371 | 2,371 | 82.7 |
| 6,000 | 2,964 | 2,964 | 84.6 |
| 7,200 | 3,557 | 3,557 | 86.5 |
| 8,400 | 4,150 | 4,150 | 88.4 |
| 9,600 | 4,742 | 4,742 | 90.4 |
| 10,800 | 5,335 | 5,335 | 92.3 |
| 12,000 | 5,928 | 5,928 | 94.2 |
Δ Temp surface→TD: 19.2 °F
Gradient: 0.4940 psi/ft
EMW @ TD: 9.50 ppg
Scenario comparison
Save the current run, then change inputs and save again to overlay how hydrostatic and pressure-with-surface change with depth across scenarios.
No scenarios saved yet — adjust inputs and click Save current scenario to add the first run.