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What is 1 millidarcy (1mD)

 
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PostPosted: Fri May 29, 2009 3:47 pm    Post subject: What is 1 millidarcy (1mD) Reply with quote

1 millidarcy is one-thousandth of a darcy (1 mD = 0.001 darcy).

Darcy is the unit of permeability commonly used in oil and water reservoir to express the ability of fluid to flow through a porous media (letís say a sandstone reservoir for gas).

1 darcy will require that the

1. fluid has a viscosity of 1 cp (centipoise),
2. the fluid is flowing at a rate of 1 cubic cm per second,
3. and passing a length of 1 cm of the porous media which has a cross-sectional area of 1 square cm.
4. while all these happens, atmospheric pressure drops 1 unit (means 1 atmosphere pressure drop).

One example of very low-permeability reservoir is the South Koreaís offshore natural gas reservoir in the East Sea, where in the deformed sandstone reservoir the maximum permeability reaches to about 0.365 mD (at a depth of about 3000 m). In undeformed sandstone reservoir it reaches up to 81.6 mD (at a depth of about 3000 m). Source: low-permeability reservoir, southeast Korea.



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