PO.MBE.Gas.Pz.SI

Description

Calculates p/z ratio for gas material balance analysis, [kPa] (SI units).

Formula

=LAMBDA(P, z, LET(
    P_psi, PO.UnitConverter(P, "kPa", "psi"),
    result_psi, PO.MBE.Gas.Pz(P_psi, z),
    PO.UnitConverter(result_psi, "psi", "kPa")))

Parameters

Parameter	Unit	Description
`P`	kPa	Current reservoir pressure, [kPa]
`z`	-	Gas compressibility factor, [dimensionless]

Examples

Invocation	Expected
`=PO.MBE.Gas.Pz.SI(17237, 1)`	`17237`

Related Lambdas

`PO.MBE.Aq.Fet.J.SI`

Calculates aquifer productivity index for radial flow (Fetkovich), [m3/d/kPa] (SI units).

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`PO.MBE.Aq.Fet.JLin.SI`

Calculates aquifer productivity index for linear flow (Fetkovich), [m3/d/kPa] (SI units).

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`PO.MBE.Aq.Fet.Pa.SI`

Calculates average aquifer pressure (Fetkovich), [kPa]. pa = pi * (1 - We/Wei) (SI units).

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`PO.MBE.Aq.Fet.Rate.SI`

Calculates water influx rate (Fetkovich), [m3/d]. qw = J * (pa - pr) (SI units).

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`PO.MBE.Aq.Fet.Wei.SI`

Calculates maximum encroachable water (Fetkovich), [m3]. Wei = ct * Wi * pi (SI units).

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`PO.MBE.Aq.Fet.Wi.SI`

Calculates initial water volume in aquifer (radial), [m3] (SI units).

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Used in Blueprints

Compare standard vs modified p/z analysis for geopressured (abnormally pressured) gas reservoirs. Standard p/z overestimates OGIP because it ignores formation and water compressibility. The modified p/z method corrects for this, producing a straight line even for geopressured reservoirs.

Gas Reservoir p/z Analysis

Perform p/z analysis for gas reservoirs to estimate OGIP (Original Gas in Place). The p/z vs Gp plot is linear for volumetric depletion, with x-intercept = OGIP.

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