Convert Darcy to Millidarcy
Convert Darcy (D) to Millidarcy (mD) instantly and accurately.
Conversion Formula
mD = D × 1000
About Darcy
The darcy (D) ≈ 9.869 × 10⁻¹³ m², the oilfield-standard permeability unit defined by Darcy's law: 1 D passes 1 cm³/s of 1 cP fluid through 1 cm² cross-section under a 1 atm/cm gradient. Highly permeable consolidated sandstone: 1-5 D; unconsolidated sand: 5-20 D. 1 D = 1 000 mD ≈ 0.9869 µm².
About Millidarcy
The millidarcy (mD) equals 10⁻³ D ≈ 9.869 × 10⁻¹⁶ m², the everyday unit in petroleum reservoir engineering worldwide. Conventional sandstone reservoirs: 1-1 000 mD; carbonate reservoirs: 0.1-100 mD; economic gas recovery typically requires k ≥ 0.1 mD. Permeameter and well-test reports give results in mD. 1 mD = 10⁻³ D = 10³ µD.
Quick Reference Table
| Darcy (D) | Millidarcy (mD) |
|---|---|
| 1 D | 1000 mD |
| 2 D | 2000 mD |
| 5 D | 5000 mD |
| 10 D | 10000 mD |
| 25 D | 25000 mD |
| 50 D | 50000 mD |
| 100 D | 100000 mD |