Klinkenberg permeability equation
WebMay 1, 2024 · This model considers the stress–strain equation, porosity dynamic evolution equation, and permeability equation with Klinkenberg effects. The primary focus was that the Klinkenberg effect, which is linked to variable porosity in coal, was treated as a dynamic parameter affecting the permeability of the coal matrix. A numerical model, based on ... WebOct 31, 2016 · Most of coal fields in China have low permeability, which is a key parameter to reflect the possibility of gas migration in coal seams, coal and gas outburst. Permeability is also a important factor for expectation and mine of coal-bed methane. Low permeability coal seams have significant Klinkenberg effect, and that with decreasing permeability of …
Klinkenberg permeability equation
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WebAug 26, 2016 · The Klinkenberg effect is usually only noticeable in the laboratory permeability experiments. Unlike liquid molecules, gas molecules collide with each other and the velocity of the gas molecules that are close to the surface of the capillaries is non-zero (Moghadam and Chalaturnyk 2014).This phenomenon, called the Klinkenberg effect, … WebJun 24, 2015 · The effective liquid permeability can be determined in the laboratory by measuring gas permeabilities at different average core pressures. A plot of yields an intercept equal to kl ( Fig. 1) of 24 md compared with 48 md at low pressure. The Klinkenberg effect is unimportant at reservoir pressures.
WebK = permeability (Darcies) MU = viscosity of fluid (centipoise) Pr - Pb = pressure differential from reservoir to wellbore (psi) Rr = radius of reservoir = length of flow path (feet) Rb = radius of wellbore (feet) The unit used in measuring permeability is the Darcy. WebLiquid permeability modeled from contributions from each pore size by using Kozeny{\textquoteright}s equation and surface relaxation times from nuclear magnetic resonance data shows that the largest pores have no positive effect on permeability because of the existence of pore throats; instead, they may have a negative effect on …
WebNov 1, 2024 · This linearity of k a vs 1/P e is consistent with the Klinkenberg equation. Using the Klinkenberg equation to obtain k ∞ and b k, a. Conclusions. This systematic investigation into gas permeability, relative permeability, diffusivity, and water imbibition provides many insights on gas flow and the Klinkenberg effect in nanoporous rocks: • WebSep 27, 2024 · Klinkenberg-corrected permeability (k∞) or water permeability (kw) is an important input parameter for hydrocarbon reservoir simulation studies. The theoretical concept that a core sample’s...
WebThis pressure dependence has been characterized by the Klinkenberg (Klinkenberg, 1941) equation relating the apparent permeability k ato the intrinsic material permeability k in, via the Klinkenberg parameter b: ! $0L1+ P / M (10) This equation differs from typical applications of the Klinkenberg equation in that Eq.
WebJan 28, 2024 · Klinkenberg plots showed that, under constant P c, gas permeability kg decreased linearly for high values of 1/P f, reached a minimum and then sharply increased as 1/P f approached zero. Under constant P c - P f, k g again decreased linearly in the high limit of 1/P f and showed additional decrease in the low 1/P f limit. the sims buy mode large appliancesWebTo study the effect of gas slippage, a linear relation between shale apparent permeability and the reciprocal of gas pressure is proposed by Klinkenberg:1 𝑘 𝑝=𝑘𝑖𝑛(1+ 𝑝) (S1) where 𝑘 𝑝 is apparent permeability, 𝑘𝑖𝑛 is intrinsic permeability, is Klinkenberg constant, and 𝑝 is … the sims bustin out romWebSep 9, 2015 · The Klinkenberg correction is an extrapolation of these measurements to infinite gas pressure, at which point gas is assumed to behave like a liquid. In the field, permeability can be estimated in the near-wellbore region using well logging data. The primary logging data come from nuclear magnetic resonance (NMR) tools. the sims cabelos