Wellbore Genius
Back to workspace
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-calc-custom-inputs-2026-07-29T04-05-53-939Z.csv
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)
Friction & ECD inputs
Annular Bingham-plastic model. Inputs stay in field units (industry standard for mud hydraulics).
0 – 2,000 gpm
Annular outer diameter
Annular inner diameter (must be < hole ID)
From rheology: PV = θ600 − θ300
From rheology: YP = θ300 − PV
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 profile
Hydrostatic + flowing pressure and geothermal temperature 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
Equivalent Circulating Density (ECD) profile
Annular velocity 3.46 ft/s · friction gradient 0.0271 psi/ft · friction @ TD 325 psi
Friction Δp at TD
325 psi
ECD at TD
10.02 ppg
Circulating BHP
6,253 psi
ECD profile
Hydrostatic, circulating pressure & ECD to 12,000 ft| Depth [ft] | Friction [psi] | Circulating [psi] | ECD [ppg] |
|---|---|---|---|
| 0 | 0 | 0 | 9.50 |
| 1,200 | 32 | 625 | 10.02 |
| 2,400 | 65 | 1,251 | 10.02 |
| 3,600 | 97 | 1,876 | 10.02 |
| 4,800 | 130 | 2,501 | 10.02 |
| 6,000 | 162 | 3,126 | 10.02 |
| 7,200 | 195 | 3,752 | 10.02 |
| 8,400 | 227 | 4,377 | 10.02 |
| 9,600 | 260 | 5,002 | 10.02 |
| 10,800 | 292 | 5,628 | 10.02 |
| 12,000 | 325 | 6,253 | 10.02 |
v_ann: 3.46 ft/s
Annular gap: 3.500 in
Δρ (ECD − MW): 0.52 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.