PO.PVT.API.FromSGoil

Description

Converts oil specific gravity to API gravity, [dAPI].

Syntax

=PO.PVT.API.FromSGoil(SG_oil)

Parameters

Parameter Description
SG_oil Oil specific gravity, {1}.

Used in Blueprints

Bubble Point Estimation

Estimate bubble point pressure using different correlations. Compare Standing and Vasquez-Beggs methods side by side.

PVT Sensitivity to Oil Gravity

Compare PVT fluid properties across three oil gravities (25, 35, 45 °API) to quantify how API uncertainty affects bubble point, solution GOR, FVF, and viscosity. Heavy oils (low API) have lower Pb, less dissolved gas, and higher viscosity — light oils are the opposite.

Oil Viscosity Correlation Comparison

Compare oil viscosity calculations showing the progression from dead oil through saturated conditions. Dead oil viscosity depends only on temperature and API gravity, while saturated oil viscosity also depends on solution GOR.

Related Functions

PO.PVT.SG.Oil.FromAPI(API)

Converts API gravity to oil specific gravity, {1}.

PO.PVT.SG.Oil.ByDefinition(Rho_oil)

Calculates oil specific gravity from oil density, {1}.

PO.PVT.SG.Gas.ByDefinition(MW)

Calculates gas specific gravity from molecular weight, {1}.

PO.PVT.Bo.UnSat.ByDefinition(Bob, Co, Pb, P)

Calculates oil formation volume factor for undersaturated oil, P > Pb, [bbl/STB].

PO.PVT.Ma.Air.Stn()

Molecular weight of air at standard conditions, [g/mol].

PO.PVT.Bo.Sat.ByPetrosky(SG_gas, API, Rs, T_degF)

Calculates oil formation volume factor using Petrosky (1990) correlation, P <= Pb, [bbl/STB].

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