What is the Klinkenberg effect?
The observed difference in gas and water permeabilities has been analyzed in view of the Klinkenberg effect. This effect is due to slip flow of gas at pore walls which enhances gas flow when pore sizes are very small.
What is the meaning of relative permeability?
A relative permeability is defined as the ratio of the material permeability to the permeability of free space (or vacuum), μo, and given as(17.5)μrelative=μμowhere. From: Mineral Processing Design and Operations (Second Edition), 2016.
What is absolute permeability?
Absolute permeability is defined as a measure of the soil’s ability to transmit fluid.
What is relative permeability formula?
Relative permeability of free space is 1. Its expression is given as; μr= μ/μm. Relative permeability = (number of lines of magnetic induction per unit area in a material)/(number of lines per unit area in a vacuum)
What is relative permeability equation?
A relative permeability is defined as the ratio of the material permeability to the permeability of free space (or vacuum), μo, and given as(17.5)μrelative=μμowhere.
What is difference between absolute and relative permeability?
Hint: Absolute permeability is the permeability of free space. The relative permeability of a magnetic material is defined as the ratio of its absolute permeability.
What is Darcy’s equation used for?
One application of Darcy’s law is to water flow through an aquifer; Darcy’s law along with the equation of conservation of mass is equivalent to the groundwater flow equation, one of the basic relationships of hydrogeology. Darcy’s law is also used to describe oil, water, and gas flows through petroleum reservoirs.
What is permeability coefficient?
The permeability coefficient is an evaluation index of ground permeability. The larger the pores in the soil, the looser the soil mass and the stronger the soil permeability. By contrast, the denser the soil, the lower the permeability.
What is meant by relative permeability?
What is Klinkenberg effect in geology?
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.
What is the feasibility of Klinkenberg linear function of reciprocal pressure?
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. Permeability is measured in the laboratory by encasing a core plug of known length and diameter in an air-tight sleeve (the Hassler Sleeve).
Why Klinkenberg calibration is needed for gas permeability testing?
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.
What is the Klinkenberg theory of interaction?
Theory. 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.