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Journal ArticleDOI

Evolution of hysteresis relative permeability of wetting brine phase using contact angle hysteresis in a partially saturated CO2-brine system

TL;DR: In this article, the relative permeability of immiscible fluids plays a crucial role in governing dissolution and capillary trapping mechanisms in deep saline aquifers, in which CO2 is sequestered.
Abstract: In sequestration of CO2 in deep saline aquifers, the relative permeability of the immiscible fluids plays a crucial role in governing dissolution and capillary trapping mechanisms. Relative permeab...
Citations
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Proceedings Article
01 Jun 1999
TL;DR: The purpose of this book is to construct conceptual and mathematical models that can provide the information required for making decisions associated with the management of groundwater resources, and the remediation of contaminated aquifers.
Abstract: In many parts of the world, groundwater resources are under increasing threat from growing demands, wasteful use, and contamination. To face the challenge, good planning and management practices are needed. A key to the management of groundwater is the ability to model the movement of fluids and contaminants. The purpose of this book is to construct conceptual and mathematical models that can provide the information required for making decisions associated with the management of groundwater resources, and the remediation of contaminated aquifers. The basic approach of this book is to accurately describe the underlying physics of groundwater flow and solute transport in heterogeneous porous media, starting at the microscopic level, and to rigorously derive their mathematical representations at the macroscopic levels.

307 citations

Journal ArticleDOI
01 Feb 2022-Fuel
TL;DR: In this paper, the authors evaluate the performance of the three available approaches to simulate three-phase relative permeability hysteresis, i.e., Carlson, Killough and Jargon models, and compare their predictions with those of previously reported comprehensive set of experimentally measured relative permeabilities.

5 citations

Journal ArticleDOI
01 Feb 2022-Fuel
TL;DR: In this article , the authors evaluate the performance of the three available approaches to simulate three-phase relative permeability hysteresis, i.e., Carlson, Killough and Jargon models, and compare their predictions with those of previously reported comprehensive set of experimentally measured relative permeabilities.

5 citations

Posted Content
TL;DR: In this paper, the change in contact angles due to the injection of low salinity water or any other wettability altering agent in an oil-rich porous medium is modeled by a network model of disordered pores transporting two immiscible fluids.
Abstract: The change in contact angles due to the injection of low salinity water or any other wettability altering agent in an oil-rich porous medium is modeled by a network model of disordered pores transporting two immiscible fluids We introduce a dynamic wettability altering mechanism, where the time dependent wetting property of each pore is determined by the cumulative flow of water through it Simulations are performed to reach steady-state for different possible alterations in the wetting angle ($\theta$) We find that deviation from oil-wet conditions re-mobilizes the stuck clusters and increases the oil fractional flow However, the rate of increase in the fractional flow depends strongly on $\theta$ and as $\theta\to 90^\circ$, a critical angle, the system shows critical slowing down which is characterized by two dynamic critical exponents

3 citations

Journal ArticleDOI
01 Sep 2023-Fuel
TL;DR: In this paper , the authors proposed an integrated experimental and modeling approach for gas relative permeability evaluation using crushed-rock samples and performed a proof-of-concept study to demonstrate that gas-liquid relative permeability can be determined for ultra-low-permeability (unconventional) reservoir samples that have been crushed to certain grain sizes (20-35 mesh size).

2 citations

References
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Journal ArticleDOI
TL;DR: In this article, the importance of accounting for CO2 trapping in the relative permeability model for predicting the distribution and mobility of CO2 in the formation has been evaluated, and it is shown that the mechanism of capillary trapping can be exploited to improve the overall effectiveness of the injection project.
Abstract: [1] Relative permeabilities are the key descriptors in classical formulations of multiphase flow in porous media. Experimental evidence and an analysis of pore-scale physics demonstrate conclusively that relative permeabilities are not single functions of fluid saturations and that they display strong hysteresis effects. In this paper, we evaluate the relevance of relative permeability hysteresis when modeling geological CO2 sequestration processes. Here we concentrate on CO2 injection in saline aquifers. In this setting the CO2 is the nonwetting phase, and capillary trapping of the CO2 is an essential mechanism after the injection phase during the lateral and upward migration of the CO2 plume. We demonstrate the importance of accounting for CO2 trapping in the relative permeability model for predicting the distribution and mobility of CO2 in the formation. We conclude that modeling of relative permeability hysteresis is required to assess accurately the amount of CO2 that is immobilized by capillary trapping and therefore is not available to leak. We also demonstrate how the mechanism of capillary trapping can be exploited (e.g., by controlling the injection rate or alternating water and CO2 injection) to improve the overall effectiveness of the injection project.

771 citations

Journal ArticleDOI
TL;DR: In this paper, a relation between residual nonwetting-phase saturations and initial non-wetting pbase saturations is derived from published data, which is used in conrzection with established theory relating re?at ive permeabiiit y to pore-size distribution.
Abstract: Relative permeability /urrctiovs are developed {or both twoarrdthrec.phase systems with tfie satr.:ation changes in the imbibition direction. An empiricul relation between residual nonwetting-phase safura. tion ajter water imbibition and initial nonwetting pbase saturations is /ound from pu.blishcd data. Fro7n this empirical relation, expressions are obtained /or trapped and mobile nonwetting-pb(~.se saturations which are used in conrzection with established theory relating re?at ive permeabiiit y to pore-size distribution. Tbe resulting equations yield relative permeability as a /unction o/ saturation having characteristics beiieved to be representative of real systems, Tbe relative permeability o/ water wet rocks for both twoand three pbuse systems, with the saturation cba,nge in the irnbibit ion direction, may be obtained by tijis method after properly selecting two rock properties: the residual nonwe tt ing-phase sat urvrtion aiter tbe complete imbibition cycle, and the cap illary pressure curve.

729 citations

Journal ArticleDOI
TL;DR: In this paper, the most accurate relative permeability measurements are made on native-state core, where the reservoir wettability is perserved, such as cleaned core or core contaminated with drilling-mud surfactants.
Abstract: The wettability of a core will strongly affect its waterflood behavior and relative permeability. Wettability affects relative permeability because it is a major factor in the control of the location, flow, and distribution of fluids in a porous medium. In uniformly or fractionally wetted porous media, the water relative permeability increases and the oil relative permeability decreases as the system becomes more oil-wet. In a mixed-wettability system, the continuous oil-wet paths in the larger pores alter the relative permeability curves and allow the system to be waterflooded to a very low residual oil saturation (ROS) after the injection of many PV's of water. The most accurate relative permeability measurements are made on native-state core, where the reservoir wettability is perserved. Serious errors can result when measurements are made on cores with altered wettability, such as cleaned core or core contaminated with drilling-mud surfactants.

572 citations