Excel Function
PressureGradientGray
Description:
Calculates pressure gradient for multiphase pipe flow using Gray (1974) correlation, [psi/ft]. 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)
Parameters:
| Parameter | 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, [dimensionless]. |
| 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]. |
Related Theory
1 item
Related Functions
2 items
InletPressureGray
Calculates inlet pipe pressure for multiphase pipe flow using Gray (1974) correlation, [psia]. Commonly used for gas wells that are also producing liquid.
OutletPressureGray
Calculates outlet pipe pressure for multiphase pipe flow using Gray (1974) correlation, [psia]. Commonly used for gas wells that are also producing liquid.
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