Multi-scaled pore network modeling of gas-water flow in shale formations

Wang, Xiukun; Sheng, James J.

doi:10.1016/j.petrol.2019.03.005

Cited by 44 publications

(20 citation statements)

References 44 publications

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“…The lattice sites (pore bodies) are spherical and the lattice bonds (pore throats) connecting the neighboring sites are cylindrical. Both the pore throat and pore body radii are distributed using a truncated log-normal distribution where R min , R m , and R max are the minimum, mean, and maximum pore throat (or body) radius, respectively, and σ is the heterogeneity factor.…”

Section: Model Descriptionmentioning

confidence: 99%

Role of Viscous Forces in Foam Flow in Porous Media at the Pore Level

Zhao

Torabi

Yang

2021

Ind. Eng. Chem. Res.

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A pore network model is proposed to simulate the complex process of in situ foam generation, destruction, and propagation as a drainage process. Motivated by the need to account for viscous flow effects, which arise from the viscous drag of moving bubbles, the statistical physical method of the modified invasion percolation with memory algorithm is extended. The model is capable of capturing the flow characteristics of (weak) continuous gas and (strong) discontinuous gas foams based on a minimum number of input parameters, that is, pore throat size distribution, regeneration probability, network dimensionality, and size. The dependence of the flowing foam fraction on the applied pressure gradient is predicted. The steady-state relative permeabilities during the simultaneous flow of a liquid and a gas, with lamella generation, destruction, and mobilization by flow displacement, are computed. The proposed model adequately portrays literature results with the decrease in the gas relative permeability upon introduction of foams in agreement with the reported results for similar porous media. The results find application in optimizing the current population balance models and guide foam-based enhanced oil recovery projects.

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Section: Model Descriptionmentioning

confidence: 99%

Role of Viscous Forces in Foam Flow in Porous Media at the Pore Level

Zhao

Torabi

Yang

2021

Ind. Eng. Chem. Res.

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“…Each pore is assigned a coordination number based on the distribution of coordination numbers. Compared with other generation methods (Idowu, 2009;Raoof and Hassanizadeh, 2010), the method developed here can be applied to any coordination number distribution and is more flexible (Chalendar et al, 2018;Chen et al, 2019;Wang and Sheng, 2019). The detailed construction process is shown as follows:…”

Section: Viscosity Effect On Pore-scale Flow In Tight Formationsmentioning

confidence: 99%

A Study to Investigate the Viscosity Effect on Micro-Confined Fluids Flow in Tight Formations Considering Fluid–Solid Interaction

Chen

Cheng

et al. 2021

Front. Earth Sci.

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Understanding different fluids flow behavior confined in microscales has tremendous significance in the development of tight oil reservoirs. In this article, a novel semiempirical model for different confined fluid flow based on the concept of boundary layer thickness, caused by the fluid–solid interaction, is proposed. Micro-tube experiments are carried out to verify the novel model. After the validation, the viscosity effect on the flow rate and Poiseuille number considering the fluid–solid interaction is investigated. Furthermore, the novel model is incorporated into unstructured networks with anisotropy to study the viscosity effect on pore-scale flow in tight formations under the conditions of different displacement pressure gradients, different aspect ratios (ratio of the pore radius to the connecting throat radius), and different coordination numbers. Results show that the viscosity effect on the flow rate and Poiseuille number after considering the fluid–solid interaction induces a great deviation from that in conventional fluid flow. The absolute permeability is not only a parameter related to pore structures but also depends on fluid viscosity. The study provides an effective model for modeling different confined fluid flow in microscales and lays a good foundation for studying fluid flow in tight formations.

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“…He and Wu (Wu et al, 2017a;He et al, 2021) proved that van der Waals forces between the solid wall and the fluid lead to the fluid medium near the edge of the pipe wall adsorbing on the wall to form a nonflow film for microscale flow, which was called BLE (Wang and Sheng, 2019). The flow process is shown in Figure 1.…”

Section: Effect Of Blementioning

confidence: 99%

“…Circular, triangular, and rectangular pores have nonflow films on the boundary, which affect the two-phase permeability curve. For fractured media, Wang and Sheng (2019) analyzed the impact of BLE on macroscale flow characteristics and evaluated the impact of large-scale fractures on productivity but ignored the seepage law of porous media containing microscale fractures. Sun et al (2019) studied the influence of microfractures on the flow based on pore network models.…”

Section: Introductionmentioning

confidence: 99%

Research on Boundary Layer Effect in Fractured Reservoirs Based on Pore-Scale Models

Wang¹,

Zhang²,

Zhang³

2021

Front. Earth Sci.

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It is of great significance to study the seepage characteristics of heavy oil reservoirs, which are conducive to the efficient development of resources. Boundary layer effect (BLE) exists in the pore-scale flow process of macromolecular fluid media, which is different from the flow law of conventional fluid in the pore, yet the influence of BLE is ignored in the previous pore-scale simulation. Conventional porous media simulations have difficulty analyzing the mass transfer law of small-scale models under the influence of microfractures. Based on the CT scanning data and thin section data of the real core in the target area, the rock skeleton and flow space were extracted according to the maximum ball algorithm, and the pore network model representing the complex structure was constructed. The microscale effect of macromolecules in the flow process in the pores was characterized by modifying the effective flow. The effects of the BLE on the effective connectivity, displacement process, and oil distribution law were analyzed. The seepage characteristics of different wettability conditions and different water cut stages were compared. The results show that BLE reduces the effective flow space and leads to deviations in the relative permeability curve and capillary curve. For fractured porous media, the irregular shape of porous media was characterized by the morphological method, and the mass transfer process was analyzed by the equivalent flux method. The influence of the porous media shape on the macromass transfer process was compared. This study provides a solution to the problem of BLE in pore-scale simulation.

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Multi-scaled pore network modeling of gas-water flow in shale formations

Cited by 44 publications

References 44 publications

Role of Viscous Forces in Foam Flow in Porous Media at the Pore Level

Role of Viscous Forces in Foam Flow in Porous Media at the Pore Level

A Study to Investigate the Viscosity Effect on Micro-Confined Fluids Flow in Tight Formations Considering Fluid–Solid Interaction

Research on Boundary Layer Effect in Fractured Reservoirs Based on Pore-Scale Models

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