Permeability Converter
Convert between darcy, millidarcy, and other permeability units for porous media
About Permeability
Permeability is a measure of the ability of a porous material to allow fluids to pass through it. It's a fundamental property in petroleum engineering, hydrogeology, and materials science, determining how easily oil, gas, or water can flow through rock formations or other porous media.
Applications
- • Oil and gas reservoir engineering
- • Groundwater flow modeling
- • Geotechnical engineering
- • Filter and membrane design
- • Soil science and agriculture
- • Building material testing
Typical Permeabilities
- • Unconsolidated sand: ~1-1000 D
- • Sandstone reservoir: ~10-1000 mD
- • Limestone: ~1-100 mD
- • Tight gas sand: ~0.01-1 mD
- • Shale: ~1-1000 nD
- • Concrete: ~0.001-1 mD
Darcy's Law
Flow rate = (Permeability × Area × Pressure gradient) / (Viscosity × Length). The Darcy unit (D) is defined as the permeability that allows a flow of 1 cm³/s of fluid with 1 cP viscosity through 1 cm² area under 1 atm/cm pressure gradient.