Capillary Pressure Models — Brooks-Corey, Van Genuchten, Leverett J

Compare three capillary pressure models with named inputs: Brooks-Corey, Van Genuchten, and Leverett J-function. 20 saturation points with J-function scaling chart.

Capillary Pressure Models Excel workbook

CapillaryPressure.xlsx

Capillary Pressure Models — Brooks-Corey, Van Genuchten, Leverett J: Capillary Pressure vs Saturation (Pc Curves)

Capillary Pressure Models — Brooks-Corey, Van Genuchten, Leverett J: Leverett J-Function (Pc Curves)

Capillary Pressure Models — Brooks-Corey, Van Genuchten, Leverett J: Inputs sheet

Capillary Pressure Models — Brooks-Corey, Van Genuchten, Leverett J: Pc Curves sheet

Description Preview Requirements

Inputs

Named cells you can edit — every result recalculates from them.

Name	Description	Default	Unit
`PC_Swi`	Irreducible Water (Swi)	0.20	fraction
`PC_Pd`	Entry Pressure (Pd)	5	psi
`PC_lambda`	Pore Size Distribution (λ)	2.0	dimensionless
`PC_alpha`	alpha	0.1	1/psi
`PC_n`	n	2.5	dimensionless
`PC_k`	Permeability	100	mD
`PC_phi`	Porosity	0.20	fraction
`PC_IFT`	Interfacial Tension	30	dyne/cm
`PC_theta`	Contact Angle	0	degrees

2 sheets, shown with the values the file opens with

	A	B	C
1	Capillary Pressure — Inputs
2	Three capillary pressure models compared: Brooks-Corey (pore-size distribution), Van Genuchten (soil science origin, flexible shape), and Leverett J-function (dimensionless scaling).
3
4	Common Parameters
5	Irreducible Water (Swi)	0.2	fraction
6
7	Brooks-Corey Parameters
8	Entry Pressure (Pd)	5	psi
9	Pore Size Distribution (λ)	2	dimensionless
10
11	Van Genuchten Parameters
12	alpha	0.1	1/psi
13	n	2.5	dimensionless
14
15	Leverett J-Function Parameters
16	Permeability	100	mD
17	Porosity	0.2	fraction
18	Interfacial Tension	30	dyne/cm
19	Contact Angle	0	degrees

	A	B	C	D
1	Capillary Pressure Curves
2	Pc vs Sw for each model, plus the dimensionless J-function derived from Brooks-Corey Pc.
3
4	Pc Table
5	Sw	BC Pc (psi)	VG Pc (psi)	J-function
6	0.22	31.6227766	116.8606453	5.105267698
7	0.25	20	63.24529994	3.228854798
8	0.28	15.8113883	46.01327289	2.552633849
9	0.3	14.14213562	39.49523275	2.283145123
10	0.33	12.40347346	32.92163197	2.002450739
11	0.35	11.54700538	29.76142116	1.864180187
12	0.38	10.54092553	26.10848045	1.701755899
13	0.4	10	24.16697291	1.614427399
14	0.45	8.94427191	20.40680117	1.443987764
15	0.5	8.164965809	17.63176591	1.318174451
16	0.55	7.55928946	15.44819189	1.220392402
17	0.6	7.071067812	13.64482273	1.141572562
18	0.65	6.666666667	12.09525081	1.076284933
19	0.7	6.32455532	10.71615581	1.02105354
20	0.75	6.030226892	9.446394364	0.9735363516
21	0.8	5.773502692	8.234015865	0.9320900934
22	0.85	5.547001962	7.024060631	0.895523195
23	0.9	5.345224838	5.736696301	0.8629477432
24	0.95	5.163977795	4.188839791	0.833686724
25	1	5	0	0.8072136995
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Brooks-Corey Van Genuchten

J-function

Name	Refers To	Comment
PC_IFT	Inputs!$B$18
PC_Pd	Inputs!$B$8
PC_Swi	Inputs!$B$5
PC_alpha	Inputs!$B$12
PC_k	Inputs!$B$16
PC_lambda	Inputs!$B$9
PC_n	Inputs!$B$13
PC_phi	Inputs!$B$17
PC_theta	Inputs!$B$19

Opens in	Needs the Petroleum Office add-in: its PO functions show #NAME? without it once Excel recalculates.
Functions used	PO.SCAL.BrooksCorey.Pc PO.SCAL.Leverett.J PO.SCAL.VanGenuchten.Pc
File	CapillaryPressure.xlsx, 12 KB
Category	Petrophysics
For agents and tools	Structure (.json) · Descriptor (.md)

Tags:

capillary-pressurebrooks-coreyvan-genuchtenleverett-j-functionscal

Capillary Pressure Models — Brooks-Corey, Van Genuchten, Leverett J

Inputs

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