Core Permeability
Core Permeability - Related Videos
02:10
The Nucleosome Core Particle
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2020
Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins. The paradox Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their main responsibility is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. While on the other hand, they must allow polymerase enzymes to access DNA...
09:27
Encapsulation and Permeability Characteristics of Plasma Polymerized Hollow Particles
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Cited by 1 •
2012
We have used plasma enhanced chemical vapor deposition to deposit thin films ranging from a few nm to several 100 nm on nano-sized particles of various materials. We subsequently etch the core material to produce hollow nanoshells whose permeability is controlled by the thickness of the shell. We characterize the permeability of these coatings to small solutes and demonstrate that these barriers can provide sustained release of the core material over several days.
06:37
An Assay for Permeability of the Zebrafish Embryonic Neuroepithelium
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Cited by 11 •
2012
We describe a live whole animal quantitative measurement for permeability of the embryonic zebrafish brain. The technique analyzes the ability to retain cerebrospinal fluid and molecules of different molecular weights within the neural tube lumen and quantifies their movement out of the ventricles. This method is useful for determining differences in epithelial permeability and maturation during development and disease.
07:03
An in vivo Assay to Test Blood Vessel Permeability
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Cited by 335 •
2013
We are presenting an in vivo assay to test blood vessel permeability. This assay is based on intravenous injection of a dye and subsequent visualization of its diffusion into interstitial spaces.
01:25
Permeability of Concrete
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2024
Permeability in the context of concrete refers to how easily liquids or gases can pass through the material. This quality is crucial for assessing the water-tightness and durability of concrete structures and their resistance to chemical attacks. Concrete permeability can be determined through comparative laboratory tests. These tests typically involve sealing a concrete specimen from the sides, applying water pressure to the top surface with pressure, and measuring the amount of water passing...
FAQs
In a core test, Darcy’s law provides the link between the imposed pressure gradient and the fluid’s measured flow rate through the plug. The permeability calculation therefore depends on both the driving pressure difference and the resulting throughput, rather than on flow rate alone. This relationship converts an experimental observation into a parameter used for reservoir and subsurface analysis.
The terms absolute and effective permeability indicate that fluid saturation matters when interpreting a measurement. A reported value should therefore be read alongside the saturation condition under which it was obtained, because measurements representing different saturation states may describe different flow behavior. This distinction is important when using core results in reservoir or subsurface models.
Pressure gradient and flow rate are the central experimental quantities in the calculation. A controlled gradient drives fluid through the prepared core plug, while the resulting rate supplies the measured response used with Darcy’s law. Maintaining control over these quantities allows samples to be compared more meaningfully and helps ensure that the reported value reflects fluid transmissibility through the tested rock.
Permeability becomes more informative when interpreted with porosity, saturation, and geological observations. These accompanying data provide context for how much pore space exists, which fluids occupy it, and how the rock’s geological character may relate to measured transmissibility. Together, the measurements support formation-model calibration and more informed engineering decisions than permeability alone.
Laboratory testing starts with a prepared core plug and a fluid, then applies a controlled pressure gradient across the sample. The resulting flow rate is measured and related to the pressure gradient through Darcy’s law. The resulting permeability value can then be classified according to the relevant saturation condition and incorporated into engineering analysis.
Engineers use Core permeability data to characterize reservoirs and assess fluid transmissibility within subsurface formations. The measurements can calibrate formation models and support predictions of production or injection performance. When integrated with porosity, saturation, and geological observations, they also contribute to decisions about well placement and reservoir management, linking laboratory results with field-scale planning.