Permeability Converter
Permeability measures how easily a fluid flows through porous material. 1 Darcy ≈ ability of water to flow through a sand filter.
Common Permeability Conversions
| From | To |
|---|---|
| 1 Darcy | 9.8692×10⁻¹³ m² |
| 1 mD (millidarcy) | 9.8692×10⁻¹⁶ m² |
| 100 mD | 0.9869 Darcy |
Permeability Unit Definitions
- Darcy (D)
- CGS unit named after Henry Darcy.
- Millidarcy (mD)
- Common in petroleum engineering.
- Square meter (m²)
- SI unit of permeability.
Frequently Asked Questions
What permeability is considered good for an oil reservoir?
Typically 10–10,000 mD. Below 1 mD is considered tight; shale formations can be <0.001 mD, requiring hydraulic fracturing.
How does permeability differ from porosity?
Porosity is void space volume fraction; permeability measures how connected those voids are for flow. High porosity does not guarantee high permeability.
What is Darcy's law?
Darcy's law: Q = -kA(dP/dx)/µ, where Q is flow rate, k is permeability, A is area, dP/dx is pressure gradient, and µ is fluid viscosity. Permeability in SI units is m².