Gas slippage effect
WebAug 5, 2024 · Threshold pressure gradient, gas slippage, and stress sensitivity have important effects on the production of a tight gas reservoir. But previous studies only focused on one or two of these effects. In this study, a mathematical model considering these three effects was established to describe gas transport in a dual-porosity tight gas … WebThe gas permeability increasingly decreases with the increase of internal pressure.The effective stress is stronger than slippage effect, and the gas permeability increases with …
Gas slippage effect
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WebJun 15, 2015 · Klinkenberg effect The permeability of a sample to a gas varies with the molecular weight of the gas and the applied pressure, as a consequence of gas … WebMar 26, 2001 · Abstract. Gas slippage in single-phase gas flow (Klinkenberg Effect) has been investigated extensively. Few papers, however, have been published on the gas slippage in gas-liquid two-phase flow. The gas relative permeabilities at water saturations close to the residual value have been found to be significantly greater than one in both …
Web20 rows · Slippage effect on the development index is analyzed by changing the value of slippage factors. The existence of the slippage effect can help improve gas well productivity. As is shown in Fig. 7.195, under the same production pressure difference, … WebOct 5, 2003 · This paper presents results from a laboratory study of the two-phase gas slippage phenomenon and its impact on effective and relative gas permeabilities in tight …
WebApr 13, 2024 · The obtained results show that (1) bituminous coal permeability underwent a negative logarithmic change with pore pressure (0.2–0.8 MPa) at different temperatures because of gas adsorption–expansion, gas slippage, and shear deformation. WebThe gas permeability of porous media increases with the increment of porosity, while it decreases with increased pore fractal dimension under fixed porosity. Furthermore, the gas slippage effect strengthens as the pore fractal dimension decreases.
WebMar 17, 2024 · High gas pressure is often applied to reduce the gas slippage effect because high gas pressure can lead to a smaller mean free path of gas molecules and …
WebNov 28, 2013 · (1) Limit Pressure. There exists gas slip effect in gas flow through tight sandstone, and exerting a certain... (2) The Gas Slip Effect Is Negligible. When the … goldhill shopping centre parkingWebNov 1, 2005 · It is found that the gas permeability is larger than the absolute permeability of porous media due to the gas slippage effect. Furthermore, the rarefaction influence on the gas permeability is more evident for porous structures with low porosity. The Klinkenberg equation is confirmed for the simulated porous structures. headboard farmhouseWebAt 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. gold hill shaftesbury ukWebMay 23, 2024 · Gas slippage effect is the phenomenon that when the mean free path of gas molecules is comparable magnitude to the pore diameter, a gas molecule will not collide with other molecules and the gas flow rate through the pore will become faster. gold hill shepton malletWebDec 18, 2024 · It is mainly because gas slippage effect is more highlighted under normal conditions, then the apparent permeability will become larger and the TPG will decrease (Thomas and Katz 1968; Li and Horne 2004). Low permeability cores have stronger slippage effect and thus the TPG of low permeability core differ more greatly under … goldhill shopping centre for salePermeability 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 … gold hillside gym and fitnessWebSep 28, 2024 · In conclusion, the new model which considers the real gas effect, diffusion effect and slippage effect, can accurately calculate the apparent permeability, which is a key issue in the production dynamic analysis and productivity prediction of … headboard fixings uk