Evolution of the effective permeability for transient and pore-scale two-phase flow in real porous media

Zhang, San; Zhang, Yi; Wang, Bo

doi:10.1016/j.ijheatmasstransfer.2017.05.124

Cited by 16 publications

(5 citation statements)

References 39 publications

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“…As a consequence, the water flowed through the smaller pores with an increased tortuosity of the flow path. In addition, water occupied the pore easily with matrix suctions increasing [24]. As a result, the UPC decreased rapidly as the space available for the water flow declined.…”

Section: Unsaturated Permeabilitymentioning

confidence: 99%

The relationship between the unsaturated permeability coefficients (UPC) determined and oxidation-reduction potential (ORP) in the subsurface wastewater infiltration system (SWIS)

Li¹,

Zhang²,

Li³

et al. 2019

Desalination and Water Treatment

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a b s t r a c tThe estimation of unsaturated permeability coefficients (UPC) is of great importance on the properties of the matrix. Aim to study the relationship between the UPC and oxidation -reduction potential (ORP) in different matrix depths in the subsurface wastewater infiltration system (SWIS) and provide scientific basis for regulating SWIS and increasing pollutant removal, a test experiment of simulating the SWIS which included an inflow period (12 h) and a drying period (12 h) in one cycle was designed with a hydraulic load of 0.10 m 3 ·(m 2 ·d) -1 . Results investigated that ORP could increase with UPC increasing in 70 and 115 cm and decrease with the UPC increasing in 100 and 130 cm matrix depths. Phenomena indicated that capillary action could affect UPC and ORP obviously. Moreover, the existence of oxygen and low volumetric water contents could impose UPC and ORP. UPC in the 100 cm matrix depth below proved that anaerobic area could be found in aerobic environment under alternation conditions. UPC in different matrix depths of a satisfactory SWIS could change from 2.49 × 10 -7 to 1.16 × 10 -3 cm·s -1 . Treated water met reused requirements and no clogging was found.

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Section: Unsaturated Permeabilitymentioning

confidence: 99%

The relationship between the unsaturated permeability coefficients (UPC) determined and oxidation-reduction potential (ORP) in the subsurface wastewater infiltration system (SWIS)

Li¹,

Zhang²,

Li³

et al. 2019

Desalination and Water Treatment

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“…Currently, with the continuous advancement of micro/nano CT technology, the digital core simulation technique based on X-ray attenuation image reconstruction enables quantitative analysis of 3D pore characteristics and development of 3D digital core models for seepage simulation, thereby facilitating the elucidation of underlying physical mechanisms governing seepage. Research has been conducted to reconstruct the 3D pore models of carbonate rock, coals, sandstone, or shale to investigate the corresponding seepage characteristics of water or hydrocarbons within [9][10][11][12][13][14], as well as to investigate the particle movement or settlement in the pore network [15,16], and, lastly, the phase permeability characteristics can also be investigated by pore scale flow simulation [17,18]. Some researchers have even simulated three-phase flow characteristics under different wettability conditions within the digital cores [19,20].…”

Section: Introductionmentioning

confidence: 99%

Seepage Simulation of Conglomerate Reservoir Based on Digital Core: A Case Study of the Baikouquan Formation in Mahu Sag, Junggar Basin

Zhang,

Hu,

Dong

et al. 2023

Processes

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Pore structure and flow characteristics are key factors affecting oil recovery rates in heterogeneous tight conglomerate reservoirs. Using micron computed tomography (CT) and modular automated processing system (MAPS) techniques, the pore structure of downhole core samples taken from Mahu’s tight conglomerate reservoirs was analyzed in detail, and a two-scale digital core pore network model with both a wide field of view and high resolution was constructed based on these pore structure data; the digital pore model was corrected according to the mercury intrusion pore size distribution date. Finally, we simulated flow characteristics within the digital model and compared the calculated permeability with the indoor permeability test date to verify the dependability of the pore network. The results indicated that the pore–throat of the conglomerate reservoir in Mahu was widely distributed and exhibited significant bimodal characteristics, with main throat channels ranging from 0.5 to 4 μm. The pore structure showed pronounced microscopic heterogeneity and intricate modalities, mainly consisting of dissolved pores, intergranular pores, and microfractures. These pores were primarily strip-like, isolated, and played a more crucial role in enhancing pore connectivity rather than contributing to the overall porosity. The matrix pores depicted by the MAPS were relatively smaller in size and more abundant in number, with no individual pore type forming a functional seepage channel. The permeability parameters obtained from the two-scale coarse-fine coupled pore network aligned with the laboratory experimental results, displaying an average coordination number of two. Flow simulation results indicated that the core’s microscopic pore structure affected the shape of the displacement leading edge, resulting in a tongue-in phenomenon during oil–water flow. The dominant flow channel was mainly dominated by water, while tongue-in and by-pass flow were the primary microscopic seepage mechanisms hindering oil recovery. These findings lay a foundation for characterizing and analyzing pore structure as well as investigating flow mechanisms in conglomerate reservoirs.

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“…In another related study, Arshadi et al 14 combined a microcore displacement device with a high-resolution X-ray micro-computed tomography (micro-CT) scanner for the purpose of conducting gas-brine flow experiments and studied the influencing effects of stress changes on the displacement mechanisms of filled fractures. Zhang et al 15 investigated the relationship between saturation and permeability based on real fluid passing through porous media in prefabricated bodies using scanning electron microscopy (SEM) images. In addition, Cao et al 16 investigated the effects of coordination number, length−diameter ratio, and other pore structure parameters on gas−water flow through pore scale simulation.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulations of Methane Flow Characteristics in Water-Bearing Propped Hydraulic Fractures

Zhang

Feng

et al. 2022

Energy Fuels

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Hydraulic fracturing produces propped fractures for the purpose of achieving higher permeability in coal reservoirs. The methane flow characteristics in closed propped fractures under water-bearing conditions will affect coalbed methane (CBM) production. In this study, the temporal and spatial evolution of the methane flow characteristics in water-bearing propped fractures was investigated. The results revealed that during water displacement by methane, the average velocity of methane first showed sharp increases and then gradual increases, with the average velocity of water decreasing along the horizontal flow direction of the methane. It was observed that the average velocity of water was greater than the methane velocity changed to the average velocity of the water was less than the methane velocity at a critical time, which indicated that the methane was carried by the water via a promotional relationship changed to water was pushed by the methane via a hindering relationship. The majority of methane was found to have migrated upward due to its low-gravity characteristics, which resulted in high concentrations of methane and lowdensity levels within the top spaces of water-bearing propped fractures. The rising and floating of methane resulted in higher displacement pressure gradients on methane−water interfaces, as well as greater velocity levels for methane and decreasing pressure levels from the bottom to the top layers in water-bearing propped fractures. Obvious methane flow was observed to have formed with higher methane concentrations and greater velocity levels within the top spaces of water-bearing propped fractures.

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Evolution of the effective permeability for transient and pore-scale two-phase flow in real porous media

Cited by 16 publications

References 39 publications

The relationship between the unsaturated permeability coefficients (UPC) determined and oxidation-reduction potential (ORP) in the subsurface wastewater infiltration system (SWIS)

The relationship between the unsaturated permeability coefficients (UPC) determined and oxidation-reduction potential (ORP) in the subsurface wastewater infiltration system (SWIS)

Seepage Simulation of Conglomerate Reservoir Based on Digital Core: A Case Study of the Baikouquan Formation in Mahu Sag, Junggar Basin

Numerical Simulations of Methane Flow Characteristics in Water-Bearing Propped Hydraulic Fractures

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