Wellbore Genius

Hydrostatic & Temperature Calculator

Quick downhole math: hydrostatic pressure, ECD, geothermal temperature, and Terzaghi effective stress from depth, mud weight, and rock parameters.

Depth & wellbore

True vertical depth [ft]

Mud weight [ppg]

Wellhead / annular head [psi]

Pore pressure [psi]

Annular friction loss [psi]

Surge pressure [psi]

Swab pressure [psi]

Temperature & rock

Surface temperature [°F]

Geothermal gradient [°F / 100 ft]

Overburden gradient [psi/ft]

Biot coefficient α [-]

Calculation precision

Hydrostatic / ECD [decimals]

Temperature [decimals]

Depth [decimals]

Wellbore pressure [decimals]

Results

Hydrostatic

4,940.00 psi

34,060.11 kPa

Bottomhole pressure

4,940.00 psi

34,060.11 kPa

ECD

9.50 ppg

Overbalance vs Pp

440.00 psi

3,033.69 kPa

Bottomhole temp

200.00 °F

Bottomhole temp

93.33 °C

Overburden

10,000.00 psi

68,947.59 kPa

Effective stress (σ − α·Pp)

6,400.00 psi

44,126.46 kPa

ECD comparison at depth

Comparison depth [ft]

Confirm phrase

Method	Depth [ft]	Pressure [psi]	Delta from baseline [psi]
Hydrostatic (baseline)	10000.00	4940.00	—
ECD (BHP-based)	10000.00	4940.00	—

Pressure vs depth

Depth increases downward. Active ECD lines are shown for side-by-side comparison. Circulating = static + annular friction. Surge = static + surge pressure. Swab = static − swab pressure.

Formulas

P_hyd = 0.052 · MW [ppg] · TVD [ft]

BHP = P_hyd + P_head

ECD = BHP / (0.052 · TVD)

ECD_circ = (P_hyd + P_friction) / (0.052 · TVD)

ECD_surge = (P_hyd + P_surge) / (0.052 · TVD)

ECD_swab = (P_hyd − P_swab) / (0.052 · TVD)

T_bh = T_surf + (grad / 100) · TVD

σ_eff = σ_v − α · P_p (Terzaghi)