Excel Function

# 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 |

## Related Functions

2 items

## InletPressureGray

Inlet pressure for multiphase pipe flow by Gray correlation, [psia] It is commonly used for gas wells that are also producing liquid.

## OutletPressureGray

Outlet pressure for multiphase pipe flow by Gray correlation, [psia] It is commonly used for gas wells that are also producing liquid.