PressureGradientGray

Description

Pressure gradient for multiphase pipe flow by Gray correlation, [psi/ft] It is commonly used for gas wells that are also producing liquid.

Excel Function Syntax

PressureGradientGray(Ql, Rho_l, Ul, Qg, Ug, SGgas, zFactor, IFTgl, pipeID, pipeRoughness, pipeAngle, P, T)

Online Calculator

Parameter Value Description
Ql Liquid rate, [bbl/d]
Rho_l Liquid density, [lb/ft3]
Ul Liquid viscosity, [cP]
Qg Gas rate, [mmscf/d]
Ug Gas viscosity, [cP]
SGgas Gas specific gravity (air=1.0)
zFactor Gas compressibility factor (Z), [dimensionless]
IFTgl Liquid-gas interfacial (surface) tension, [dynes/cm]
pipeID Pipe inner diameter, [in]
pipeRoughness Pipe relative roughness, [dimensionless]
pipeAngle Pipe angle from horizontal, [degrees] Horizontal flow: angle = 0; Vertical well producer: angle = 90; Vertical well injector: angle = -90;
P Pressure, [psia]
T Temperature, [degF]
Result