Millidarcy (mD)
One thousandth of a darcy. The usual unit for oil and gas reservoir rock.
What is a millidarcy?
- Symbol
- mD
- Quantity
- Permeability (Porous Media)
- Unit system
- other
- Definition
- One thousandth of a darcy. The usual unit for oil and gas reservoir rock.
- Exact
- Yes, the value is exact by definition
- Source
- NIST Special Publication 811 (2008), Appendix B.8
Common applications
The usual unit for permeability of oil and gas reservoir rock and core samples.
Millidarcy in other permeability (porous media) units
- 1 mD ≈ 9.869232667e-16 m² (k)Square meter (permeability)
- 1 mD ≈ 0.0009869232667 µm²Square micrometer
- 1 mD = 0.001 DMillidarcy to Darcy converter
Millidarcy quick reference
| Millidarcy | Darcy | Square micrometer | Square meter (permeability) |
|---|---|---|---|
| 1 mD | = 0.001 D | ≈ 0.0009869232667 µm² | ≈ 9.869232667e-16 m² (k) |
| 10 mD | = 0.01 D | ≈ 0.009869232667 µm² | ≈ 9.869232667e-15 m² (k) |
| 100 mD | = 0.1 D | ≈ 0.09869232667 µm² | ≈ 9.869232667e-14 m² (k) |
| 1000 mD | = 1 D | ≈ 0.9869232667 µm² | ≈ 9.869232667e-13 m² (k) |
Where the millidarcy fits
The next larger permeability (porous media) unit is the darcy (D). 1 mD = 0.001 D, and 1 D = 1000 mD.
Frequently asked questions
- How many darcies are in one millidarcy?
- One millidarcy = 0.001 D (darcies).
- How many square micrometers are in one millidarcy?
- One millidarcy ≈ 0.0009869232667 µm² (square micrometers).
- How many square meters (permeability) are in one millidarcy?
- One millidarcy ≈ 9.869232667e-16 m² (k) (square meters (permeability)).