Imbibition

14,000,000 Leading Edge Experts on the ideXlab platform

Scan Science and Technology

Contact Leading Edge Experts & Companies

Scan Science and Technology

Contact Leading Edge Experts & Companies

The Experts below are selected from a list of 16353 Experts worldwide ranked by ideXlab platform

Giancarlo Flores - One of the best experts on this subject based on the ideXlab platform.

  • changes in residual air saturation after thorough drainage processes in an air water fine sandy medium
    Journal of Hydrology, 2014
    Co-Authors: Zhen Xia, Qingshu Yang, Giancarlo Flores, Haoyu Jiang, Masashi Kamon
    Abstract:

    Summary In a previous study we investigated the unstable and stable residual air saturations in an air–water two-phase system in a sand medium during a series of consecutive drainage–Imbibition cycles with gradually increasing initial air saturations. In a reciprocal study reported here we extended the previous investigation by determining residual air saturations in consecutive Imbibition processes starting from four gradually decreasing levels of initial air saturation (and thus increasing water saturation). Three parallel column tests with 9–12 consecutive drainage–Imbibition cycles were performed, in which the first three Imbibition processes started from the highest initial air saturation that could be obtained with our experimental system. The results show that all the residual air saturations resulting from the Imbibition processes were almost constant after thorough drainage processes (even those following Imbibition processes starting from low initial air saturations), and thus independent of the initial air saturation. The results also indicate that once the residual air in interconnected pores at the end of an Imbibition process was present in the form of connected, pore network-scale air globules, the residual air remained in this state in subsequent Imbibition processes, even if they started from low initial air saturations. It may be deduced that the presence of thin water films on the walls surrounding large pores and large volumes of air in their central parts during an Imbibition process resulted in residual air being in the form of connected, pore-network scale air globules in interconnected pores. In contrast, thick water films and small volumes of air in the central parts of the pores resulted in residual air in the form of single pore-scale air globules in interconnected pores. Thus, stronger dynamic flow conditions (e.g., higher capillary numbers) may be required to remobilize connected, pore network-scale air globules than single pore-scale air globules in a forced Imbibition process.

  • residual air saturation changes during consecutive drainage Imbibition cycles in an air water fine sandy medium
    Journal of Hydrology, 2013
    Co-Authors: Giancarlo Flores, Weizhong Yue, Yuxin Wang, Tianggang Luan
    Abstract:

    Summary To clarify changes of residual air saturation under special (dynamic, nonequilibrium) conditions, the saturation–capillary pressure (S–p) relationship including the residual air saturation under consecutive drainage–Imbibition cycles, generated by scheduled water level fluctuations, in an air–water two-phase sandy column was investigated. Water saturation and capillary pressure were measured online and recorded using TDR (Time Domain Reflectometry) probes, T5 tensiometers and a datalogger. The results show that under dynamic flow conditions the residual air saturation changed suddenly from an unstable to a stable state with changes in initial air saturation during the series of Imbibition cycles, and stable nonzero residual air saturation only occurred when the initial air saturation of the Imbibition process exceeded 0.49, ca. double the value of the main Imbibition process. Once stable residual air saturation was obtained, all the subsequent residual air saturations remained stable and constant in the following Imbibition cycles. Before this threshold point, the residual air saturation gradually fell given sufficient Imbibition time. The results also indicate that the unstable and stable residual air saturations were mainly due to discrete pore-scale air globules trapped in the interiors of pores and pore-network scale globules located in interconnected pores, respectively.

Tianggang Luan - One of the best experts on this subject based on the ideXlab platform.

  • residual air saturation changes during consecutive drainage Imbibition cycles in an air water fine sandy medium
    Journal of Hydrology, 2013
    Co-Authors: Giancarlo Flores, Weizhong Yue, Yuxin Wang, Tianggang Luan
    Abstract:

    Summary To clarify changes of residual air saturation under special (dynamic, nonequilibrium) conditions, the saturation–capillary pressure (S–p) relationship including the residual air saturation under consecutive drainage–Imbibition cycles, generated by scheduled water level fluctuations, in an air–water two-phase sandy column was investigated. Water saturation and capillary pressure were measured online and recorded using TDR (Time Domain Reflectometry) probes, T5 tensiometers and a datalogger. The results show that under dynamic flow conditions the residual air saturation changed suddenly from an unstable to a stable state with changes in initial air saturation during the series of Imbibition cycles, and stable nonzero residual air saturation only occurred when the initial air saturation of the Imbibition process exceeded 0.49, ca. double the value of the main Imbibition process. Once stable residual air saturation was obtained, all the subsequent residual air saturations remained stable and constant in the following Imbibition cycles. Before this threshold point, the residual air saturation gradually fell given sufficient Imbibition time. The results also indicate that the unstable and stable residual air saturations were mainly due to discrete pore-scale air globules trapped in the interiors of pores and pore-network scale globules located in interconnected pores, respectively.

Masashi Kamon - One of the best experts on this subject based on the ideXlab platform.

  • changes in residual air saturation after thorough drainage processes in an air water fine sandy medium
    Journal of Hydrology, 2014
    Co-Authors: Zhen Xia, Qingshu Yang, Giancarlo Flores, Haoyu Jiang, Masashi Kamon
    Abstract:

    Summary In a previous study we investigated the unstable and stable residual air saturations in an air–water two-phase system in a sand medium during a series of consecutive drainage–Imbibition cycles with gradually increasing initial air saturations. In a reciprocal study reported here we extended the previous investigation by determining residual air saturations in consecutive Imbibition processes starting from four gradually decreasing levels of initial air saturation (and thus increasing water saturation). Three parallel column tests with 9–12 consecutive drainage–Imbibition cycles were performed, in which the first three Imbibition processes started from the highest initial air saturation that could be obtained with our experimental system. The results show that all the residual air saturations resulting from the Imbibition processes were almost constant after thorough drainage processes (even those following Imbibition processes starting from low initial air saturations), and thus independent of the initial air saturation. The results also indicate that once the residual air in interconnected pores at the end of an Imbibition process was present in the form of connected, pore network-scale air globules, the residual air remained in this state in subsequent Imbibition processes, even if they started from low initial air saturations. It may be deduced that the presence of thin water films on the walls surrounding large pores and large volumes of air in their central parts during an Imbibition process resulted in residual air being in the form of connected, pore-network scale air globules in interconnected pores. In contrast, thick water films and small volumes of air in the central parts of the pores resulted in residual air in the form of single pore-scale air globules in interconnected pores. Thus, stronger dynamic flow conditions (e.g., higher capillary numbers) may be required to remobilize connected, pore network-scale air globules than single pore-scale air globules in a forced Imbibition process.

Dag Chun Standnes - One of the best experts on this subject based on the ideXlab platform.

  • index for characterizing wettability of reservoir rocks based on spontaneous Imbibition recovery data
    Energy & Fuels, 2013
    Co-Authors: Abouzar Mirzaeipaiaman, Mohsen Masihi, Dag Chun Standnes
    Abstract:

    An index for characterizing wettability of reservoir rocks is presented using slope analysis of spontaneous Imbibition recovery data. The slope analysis is performed using the known exact analytical solution to infinite acting period of counter-current spontaneous Imbibition. The proposed theoretically based wettability index offers some advantages over existing methods: (1) it is a better measure of the spontaneous Imbibition potential of rock (because the magnitude is directly proportional to the Imbibition rate); (2) there is no need for forced displacement data; (3) there is no need for waiting until the spontaneous Imbibition process ceases completely; and (4) the data needed to run the new method are all easy to measure. Experimental data from the literature are used as examples on how to use the new method.

  • an analytical model for spontaneous Imbibition in fractal porous media including gravity
    Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2012
    Co-Authors: Jianchao Cai, Dag Chun Standnes
    Abstract:

    Abstract Spontaneous Imbibition of wetting liquid into porous media is regarded as a crucially important driving mechanism for enhancing oil recovery from naturally fractured reservoir, especially with low permeability. Based on the fractal character of pores in porous media, a full analytical model for characterizing spontaneous Imbibition of wetting liquid vertically into gas-saturated porous media has been derived including gravity over the entire Imbibition process time frame. The weight of wetting liquid imbibed into porous media is a function of contact area, porosity, pore fractal dimension, tortuosity, maximum hydraulic pore diameter, liquid density, viscosity, surface tension and liquid–solid interactions. Factors influencing the Imbibition process upon approaching equilibrium weight were also analyzed. The proposed analytical model is consistent with the previous models and the predictions are in good agreement with available experimental data published in the literature.

Jianchao Cai - One of the best experts on this subject based on the ideXlab platform.

  • kozeny carman constant of porous media insights from fractal capillary Imbibition theory
    Fuel, 2018
    Co-Authors: Wei Wei, Boqi Xiao, Jianchao Cai, Qingbang Meng, Junfeng Xiao, Qi Han
    Abstract:

    Abstract The Kozeny-Carman (KC) equation has been widely used in many fields including shale and tight reservoirs, soil physics and chemical engineering. However, accurate calculation of KC constant is always a challenge. This work focuses on analysis of the KC constant in capillary Imbibition process based on fractal distribution characteristics of hydraulic pore diameter. The proposed model incorporates gravity over the entire time frame of Imbibition process, which is expressed in terms of porosity, fractal dimension, tortuosity, maximum hydraulic pore diameter, liquid density, viscosity, surface tension and contact angle. The theoretical predictions from the developed model provide a good agreement with experimental results of emulsion Imbibition, with values of fractal dimension and tortuosity from fitting of height-time data of emulsion Imbibition.

  • generalized modeling of spontaneous Imbibition based on hagen poiseuille flow in tortuous capillaries with variably shaped apertures
    Langmuir, 2014
    Co-Authors: Jianchao Cai, Edmund Perfect, Chulin Cheng
    Abstract:

    Spontaneous Imbibition of wetting liquids in porous media is a ubiquitous natural phenomenon which has received much attention in a wide variety of fields over several decades. Many traditional and recently presented capillary-driven flow models are derived based on Hagen–Poiseuille (H–P) flow in cylindrical capillaries. However, some limitations of these models have motivated modifications by taking into account different geometrical factors. In this work, a more generalized spontaneous Imbibition model is developed by considering the different sizes and shapes of pores, the tortuosity of Imbibition streamlines in random porous media, and the initial wetting-phase saturation. The interrelationships of accumulated Imbibition weight, Imbibition rate and gas recovery and the properties of the porous media, wetting liquids, and their interactions are derived analytically. A theoretical analysis and comparison denote that the presented equations can generalize several traditional and newly developed models fr...

  • an analytical model for spontaneous Imbibition in fractal porous media including gravity
    Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2012
    Co-Authors: Jianchao Cai, Dag Chun Standnes
    Abstract:

    Abstract Spontaneous Imbibition of wetting liquid into porous media is regarded as a crucially important driving mechanism for enhancing oil recovery from naturally fractured reservoir, especially with low permeability. Based on the fractal character of pores in porous media, a full analytical model for characterizing spontaneous Imbibition of wetting liquid vertically into gas-saturated porous media has been derived including gravity over the entire Imbibition process time frame. The weight of wetting liquid imbibed into porous media is a function of contact area, porosity, pore fractal dimension, tortuosity, maximum hydraulic pore diameter, liquid density, viscosity, surface tension and liquid–solid interactions. Factors influencing the Imbibition process upon approaching equilibrium weight were also analyzed. The proposed analytical model is consistent with the previous models and the predictions are in good agreement with available experimental data published in the literature.