Geothermal Wellbore Flashing Depth & Boiling Point Calculator

Determine the exact subsurface depth (m) where rising liquid geothermal brine begins boiling and flashing into steam using thermodynamic saturation curves.

Reservoir & Production Parameters

Reservoir Brine Temp T_res (°C):

Flowing Wellhead Pressure P_wh (bar):

Reservoir Pressure P_res (bar):

Total Well Depth TVD (m):

Brine Salinity TDS (g/L): Dissolved salts lower vapor pressure

Non-Condensable Gas NCG (wt%): CO2 + H2S partial pressure initiates early flash

Flashing Point & Pressure Gradient

Subsurface Flash Depth:

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Bubble Point Pressure P_sat:

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Single-Phase Liquid Column:

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Two-Phase Steam Column:

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Calcite Scaling Risk Zone:

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Frequently Asked Questions

What is the flashing depth in a geothermal well?

The flashing depth is the subsurface level where ascending pressurized geothermal liquid reaches its saturation boiling pressure. Above this depth, water boils vigorously into a two-phase steam-water mixture that accelerates up the wellbore.

Why does severe calcite (CaCO3) scaling occur exactly at the flash depth?

When the brine flashes, dissolved carbon dioxide (CO2) instantly degasses into the steam phase. The loss of CO2 causes brine pH to spike, destroying calcium bicarbonate solubility and depositing rock-hard calcite scale that chokes casing flow within weeks.

How does non-condensable gas (NCG) affect the flash point?

Dissolved CO2 and H2S exert high partial pressures, causing the brine to begin bubbling at much higher pressures and deeper wellbore levels than pure water.