Calculate Permeability K - Coates & Dumanoir (1973)

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Permeability- Coates & Dumanoir (1973)

Coates & Dumanoir (1973) proposed a more expression for permeability calculation. This equation includes water resistivity and water resistiviy of a formation at an irreducible water saturation zone values, and some constants that are related to resistivity and density values. The equation is the following:

Where:
• K= permeability in milidarcys
• Rw= formation water resistivity at formation temperature
• Rt irr= true formation resistivity from a formation at irreducible water saturation (Swirr)
• ɸ = porosity
• C= Coates and Dumanoir constant
• W= Coates and Dumanoir constant

Calculate Permeability (k) - Coates & Dumanoir (1973)
c:		ɸ: Decimal
W:		Rw: ohm-m
Rwtirr: ohm-m

Constant W

Constant W of the Coates & Dumanoir equation, is calculated considering porosity and resistivity values, and it is the following:

Where:
• Rw= formation water resistivity at formation temperature
• Rt irr= true formation resistivity from a formation at irreducible water saturation (Swirr)
• ɸ= porosity

Calculate Constant W - Coates and Dumanoir (1973)
ɸ: Decimal		Rw: ohm-m
Rwtirr: ohm-m

Constant C

In the case of constant C, this is calculated from the following expression, which only considers the hydrocarbon density value:

Where:
• ρh = hydrocarbon density in g / cm3

Calculate Constant C - Coates and Dumanoir (1973)
ρh: g/cm3

Made by Henry Herrera