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Petroleum PVT & Bubble Point Calculator

Standing correlations — bubble point Pb, Rs, and Bo from API, GOR, and temperature.

Standing (1977) correlations for bubble-point pressure, solution GOR, and oil formation volume factor — field units (psia, °F, scf/STB). Add line pressure to see Rs and Bo below or above bubble point.

Fluid presets

Oil API gravity (°API)

Gas specific gravity (γg, air = 1)

Reservoir temperature (°F)

Solution GOR Rs (scf/STB at bubble point)

Compute Rs and Bo at line pressure

Pressure (psia)

Results

Bubble point Pb

3,134 psia

Oil specific gravity γo

0.850

Rs @ pressure

611 scf/STB

Bo @ pressure

1.341 bbl/STB

Phase

At/below Pb

Estimated bubble point Pb ≈ 3134 psia at 800 scf/STB and 180 °F. At 2500 psia (below Pb), Rs ≈ 611 scf/STB and Bo ≈ 1.341 bbl/STB. Correlations are screening tools — match to lab PVT before reserves or facility design.

engineeringEngineering screening only. Engineering screening calculator only — not a substitute for licensed professional engineering, API/ASME/code-compliant design, certified reserves audits, regulatory well approvals, or field-measured PVT and flow data. Verify all inputs, units, and correlations against your facility standards and qualified sign-off before operations or design decisions.

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Related guides

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Bubble point is where free gas starts — PVT drives everything downstream

Solution gas-oil ratio, bubble-point pressure, and formation volume factor control shrinkage, separator sizing, and reserves categorization. Standing (1977) remains the workhorse screening correlation when lab PVT is not yet on hand.

Small changes in assumed Rs or gas gravity move Pb materially — always bracket low and high cases before facility commitments.

This calculator is correlation math only. Spreadsheet Studio and Document Studio are where engineers build auditable type curves, IPR tables, and AFE memos — sign in for Caleb when you want agent-drafted narratives.

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