Convert Millidarcy to Darcy
Convert Millidarcy (mD) to Darcy (D) instantly and accurately.
Conversion Formula
D = mD × 0.001
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.
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.
Quick Reference Table
| Millidarcy (mD) | Darcy (D) |
|---|---|
| 1 mD | 0.001 D |
| 2 mD | 0.002 D |
| 5 mD | 0.005 D |
| 10 mD | 0.01 D |
| 25 mD | 0.025 D |
| 50 mD | 0.05 D |
| 100 mD | 0.1 D |