Data Portal @ linkeddatafragments.org

Matches in DBpedia 2014 for { <http://dbpedia.org/resource/Klinkenberg_correction> ?p ?o. }

• Klinkenberg_correction abstract "Under steady state and laminar flow condition, Klinkenberg demonstrated that the permeability to gases is approximately a linear function of the reciprocal pressure.When Klinkenberg defined the interactions to be considered, he supposed the existence of a layer (sometimes called Knudsen layer), thinner than molecular mean free path, adjacent to the pore’s wall where only molecules-wall collisions would occur and collisions among molecules could be ignored. Thus the slippage velocity, as obtained from the Klinkenberg’s approach, captures the contribution of molecule-wall interactions and when this velocity is zero, the Poiseuille velocity profile (which results from molecule-molecule interactions) is recovered. However, Klinkenberg’s formulation ignores the transition flow region, where neither molecule-molecule nor molecule-wall interactions can be neglected because both are playing a relevant role. The feasibility of Klinkenberg linear function of the reciprocal pressure depends on the Knudsen number. For Knudsen numbers from 0.01 to 0.1 the Klinkenberg approach is acceptable.In petroleum engineering, a Klinkenberg correction is a procedure for calibration of permeability data obtained from a minipermeameter device. A more accurate correction factor can be obtained using Knudsen correction. When using nitrogen gas for core plug measurements, the Klinkenberg correction is usually necessary due to the so-called Klinkenberg gas slippage effect.This takes place when the pore space approaches the mean free path of the gasPermeability is measured in the laboratory by encasing a core plug of known length and diameter in an air-tight sleeve (the Hassler Sleeve). A fluid of known viscosity is injected into the core plug while mounted in a steel chamber. The samples are either full diameter core samples that are intervals of whole core cut, typically 6 inches long, or 1-in plugs drilled from the cores. The pressure drop across the sample and the flow rate are measured and permeability is calculated using Darcy's law.Normally, either nitrogen or brine can be used as a fluid. When high rates of flow can be maintained, the results are comparable. At low rates, air permeability will be higher than brine permeability. This is because gas does not adhere to the pore walls as liquid does, and the slippage of gases along the pore walls gives rise to an apparent dependence of permeability on pressure. This is called the Klinkenberg effect, and it is especially important in low-permeable rocks.In probe permeametry (mini-permeameter) measurement nitrogen gas is injected from the probe into core through a probe sealed to a core slab by a gasket. The gas flows from the end of a small-diameter tube that is sealed against the core surface. The pressure in the probe and the corresponding volumetric gas flow rate is measured together. The gas permeability is determined by the equation: Where, Gas permeability Flow rate Injection pressure Atmospheric pressure Gas viscosity Internal radius of tip seal Geometric factor (halfspace solution) Constant (unit conversion)Obviously what can be obtained from minipermeameter measurement is gas permeability. Gas slippage will occur during the measurement because nitrogen is injected quickly from probe to core and it is very difficult to get to equilibrium in very short time span. Therefore, to get the permeability equivalent to the brine permeability at formation condition Klinkenberg calibration is necessary.".
• Klinkenberg_correction wikiPageID "19589262".
• Klinkenberg_correction wikiPageRevisionID "570734619".
• Klinkenberg_correction hasPhotoCollection Klinkenberg_correction.
• Klinkenberg_correction subject Category:Petroleum_engineering.
• Klinkenberg_correction subject Category:Petrology.
• Klinkenberg_correction subject Category:Porous_media.
• Klinkenberg_correction type Abstraction100002137.
• Klinkenberg_correction type Company108058098.
• Klinkenberg_correction type Group100031264.
• Klinkenberg_correction type Institution108053576.
• Klinkenberg_correction type Organization108008335.
• Klinkenberg_correction type PorousMedia.
• Klinkenberg_correction type SocialGroup107950920.
• Klinkenberg_correction type YagoLegalActor.
• Klinkenberg_correction type YagoLegalActorGeo.
• Klinkenberg_correction type YagoPermanentlyLocatedEntity.
• Klinkenberg_correction comment "Under steady state and laminar flow condition, Klinkenberg demonstrated that the permeability to gases is approximately a linear function of the reciprocal pressure.When Klinkenberg defined the interactions to be considered, he supposed the existence of a layer (sometimes called Knudsen layer), thinner than molecular mean free path, adjacent to the pore’s wall where only molecules-wall collisions would occur and collisions among molecules could be ignored.".
• Klinkenberg_correction label "Klinkenberg correction".
• Klinkenberg_correction sameAs m.04myz39.
• Klinkenberg_correction sameAs Q6421071.
• Klinkenberg_correction sameAs Q6421071.
• Klinkenberg_correction sameAs Klinkenberg_correction.
• Klinkenberg_correction wasDerivedFrom Klinkenberg_correction?oldid=570734619.
• Klinkenberg_correction isPrimaryTopicOf Klinkenberg_correction.