Convert Millimetre squared to Millidarcy
Convert Millimetre squared (mm²) to Millidarcy (mD) instantly and accurately.
Conversion Formula
mD = mm² × 1013250000
About Millimetre squared
The millimetre squared (mm²) equals 10⁻⁶ m² ≈ 1.013 × 10⁹ D, representing extremely high permeabilities beyond the range of most geological materials. It appears in geotechnical research for open rock fractures, coarse gravel channel beds, and large-cell open-foam engineered materials. 1 mm² = 10⁶ µm² = 10⁻⁶ m².
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
| Millimetre squared (mm²) | Millidarcy (mD) |
|---|---|
| 1 mm² | 1.013 × 109 mD |
| 2 mm² | 2.026 × 109 mD |
| 5 mm² | 5.066 × 109 mD |
| 10 mm² | 1.013 × 1010 mD |
| 25 mm² | 2.533 × 1010 mD |
| 50 mm² | 5.066 × 1010 mD |
| 100 mm² | 1.013 × 1011 mD |