Gray Vertical Flow Correlation Calculator
Industry-standard method for vertical two-phase flow in high GLR gas wells. Uses dimensionless velocity numbers to predict flow patterns and pressure drop for gas-condensate production systems.
Well Geometry
in
ft
deg
in
Best for vertical wells (<10° deviation)
Production Rates
bbl/day
Mscfd
%
psia
Note: At standard conditions
Fluid Properties
lb/ft³
-
cP
dyne/cm
Gray's R-Factor:
R = (N_vl/N_vg)^0.982 × (N_l/N_d)^0.124
Gray Correlation Results
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About This Calculator
Calculates vertical well two-phase flow using Gray's correlation with dimensionless velocity numbers and R-factor method.