PO.VFP.Gray.Pout Function

Description:

Calculates outlet pipe pressure using Gray (1974), [psi]. For gas wells producing liquid. Gas properties (ρg, μg, Bg) use DAK (Z-factor) and LGE (viscosity).

Excel Function Syntax:

=PO.VFP.Gray.Pout(Ql, Qg, P_in, T_degF, Rho_l, Ul, SG_gas, IFT_gl, pipe_ID, pipe_length, pipe_roughness, pipe_angle)

Parameters:

Parameter	Description
Ql	Liquid rate, [bbl/D].
Qg	Gas rate, [mmscf/D].
P_in	Inlet pipe pressure, [psi].
T_degF	Temperature at middle point of the pipe, [degF].
Rho_l	Liquid density, [lb/ft3].
Ul	Liquid viscosity, [cP].
SG_gas	Gas specific gravity, [dimensionless].
IFT_gl	Liquid-gas interfacial (surface) tension, [dynes/cm].
pipe_ID	Pipe inner diameter, [in].
pipe_length	Pipe length, [ft].
pipe_roughness	Pipe relative roughness, [dimensionless].
pipe_angle	Pipe angle from horizontal, [degrees]. Horizontal flow: angle = 0; Vertical well producer: angle = 90; Vertical well injector: angle = -90.

Related Functions

PO.VFP.Ansari.dPdL

Calculates pressure gradient using Ansari et al. (1994) mechanistic model, [psi/ft]. TUFFP industry standard for vertical upward flow.

PO.VFP.Ansari.Pin

Calculates inlet pipe pressure using Ansari et al. (1994), [psi]. Vertical wells. Gas properties (ρg, μg, Bg) use DAK (Z-factor) and LGE (viscosity).

PO.VFP.Ansari.Pout

Calculates outlet pipe pressure using Ansari et al. (1994), [psi]. Vertical wells. Gas properties (ρg, μg, Bg) use DAK (Z-factor) and LGE (viscosity).

PO.VFP.Aziz.dPdL

Calculates pressure gradient using Aziz et al. (1972) drift-flux model, [psi/ft]. Vertical wells, basis for mechanistic models.

PO.VFP.Aziz.Pin

Calculates inlet pipe pressure using Aziz et al. (1972), [psi]. Vertical wells. Gas properties (ρg, μg, Bg) use DAK (Z-factor) and LGE (viscosity).

PO.VFP.Aziz.Pout

Calculates outlet pipe pressure using Aziz et al. (1972), [psi]. Vertical wells. Gas properties (ρg, μg, Bg) use DAK (Z-factor) and LGE (viscosity).

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