Review of Molecular Simulation Method for Gas Adsorption/desorption and Diffusion in Shale Matrix

Wang, Hui; Qu, Zhiguo; Yin, Ying; Bai, Junqiang; Yu, Bo

doi:10.1007/s11630-018-1053-9

Cited by 102 publications

(83 citation statements)

References 127 publications

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“…Unfortunately, the gas diffusion rate is relatively low in kerogen in terms of diffusion coefficient and total dissolved gas content. Fick's Second Diffusion Law [41] is usually applied to model gas diffusion in the kerogen matrix: [31], Fan et al [38] and Chong et al [39]). [31] and Chong et al [38]).…”

Section: Kerogen Diffusionmentioning

confidence: 99%

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Gas Multiple Flow Mechanisms and Apparent Permeability Evaluation in Shale Reservoirs

Feng

Zhao

et al. 2019

Sustainability

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Gas flow mechanisms and apparent permeability are important factors for predicating gas production in shale reservoirs. In this study, an apparent permeability model for describing gas multiple flow mechanisms in nanopores is developed and incorporated into the COMSOL solver. In addition, a dynamic permeability equation is proposed to analyze the effects of matrix shrinkage and stress sensitivity. The results indicate that pore size enlargement increases gas seepage capacity of a shale reservoir. Compared to conventional reservoirs, the ratio of apparent permeability to Darcy permeability is higher by about 1–2 orders of magnitude in small pores (1–10 nm) and at low pressures (0–5 MPa) due to multiple flow mechanisms. Flow mechanisms mainly include surface diffusion, Knudsen diffusion, and skip flow. Its weight is affected by pore size, reservoir pressure, and temperature, especially pore size ranging from 1 nm to 5 nm and reservoir pressures below 5 MPa. The combined effects of matrix shrinkage and stress sensitivity induce nanopores closure. Therefore, permeability declines about 1 order of magnitude compare to initial apparent permeability. The results also show that permeability should be adjusted during gas production to ensure a better accuracy.

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Section: Kerogen Diffusionmentioning

confidence: 99%

“…Kerogen diffusion involves the flow of shale gas dissolved in the organic kerogen nanopore under gas concentration [41] (Figure 1). Unfortunately, the gas diffusion rate is relatively low in kerogen in terms of diffusion coefficient and total dissolved gas content.…”

Section: Kerogen Diffusionmentioning

confidence: 99%

Gas Multiple Flow Mechanisms and Apparent Permeability Evaluation in Shale Reservoirs

Feng

Zhao

et al. 2019

Sustainability

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“…3 To understand the complex fluid transport in unconventional reservoirs, many researchers have done a lot of significant work. [4][5][6] Overall, tight oil reservoirs have poor physical properties. Generally, a single tight oil well has natural production capacities below the lower limit of commercial oil flow.…”

Section: Introductionmentioning

confidence: 99%

Simulation of a multistage fractured horizontal well in a tight oil reservoir using an embedded discrete fracture model

Zhao

Liu

Zhang

et al. 2019

Energy Science & Engineering

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As an unconventional resource, tight oil reservoirs hold abundant geological reserves and great development potential. However, tight oil reservoirs suffer from high heterogeneity and low permeability. To obtain commercial oil and gas flow, multistage hydraulically fractured horizontal well technology is often adopted. In this paper, an embedded discrete fracture model (EDFM) is adopted to study the fractured reservoir. First, the relationship between the EDFM connection list is studied and its coefficient matrix of the equation system is solved. EDFM connection list is a method to record the connections between the grids. Thereafter, the reasons for the sparsity of the coefficient matrix and the symmetry of the locations of nonzero elements in the matrix are explained, and a simple method to establish and assemble the coefficient matrix is proposed. Using this method, a simulator for tight oil reservoir with EDFM is developed. By comparing the simulation results of the self‐programming simulator with the commercial software SAPHIR, the usefulness of the simulator is verified. Finally, several simulations and sensitivity analysis are performed to determine the key factors affecting production. Modeling studies show the influence of fractures, the horizontal well, and stress sensitivity, providing very useful information for the design of hydraulic fracturing and production development programs.

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“…In other words, shale play characterization is a task that requires a larger variety of experimental and computational methods. Among the shale components, organic matter or kerogen, which is the source of hydrocarbons [7,8], is poorly understood compared to inorganic minerals in regards to its molecular structure. Kerogen is the amorphous and insoluble portion of the organic matter, and due to its molecular origin, the composition is very complex [9].…”

Section: Introductionmentioning

confidence: 99%

“…This chemical transformation is a complex procedure which makes predicting the stereochemistry properties of kerogen highly exacting. Therefore, building the molecular model for kerogen is challenging, and it has been continuously developing with the advancements in computational methods [8,11]. The first kerogen model was published by Burlingame et al (1969) by studying the kerogen extracted from the Green River Shale [12].…”

Section: Introductionmentioning

confidence: 99%

Developing an Amorphous Kerogen Molecular Model Based on Gas Adsorption Isotherms

Lee¹,

liu²,

Shakib³

et al. 2019

Preprint

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Review of Molecular Simulation Method for Gas Adsorption/desorption and Diffusion in Shale Matrix

Cited by 102 publications

References 127 publications

Gas Multiple Flow Mechanisms and Apparent Permeability Evaluation in Shale Reservoirs

Gas Multiple Flow Mechanisms and Apparent Permeability Evaluation in Shale Reservoirs

Simulation of a multistage fractured horizontal well in a tight oil reservoir using an embedded discrete fracture model

Developing an Amorphous Kerogen Molecular Model Based on Gas Adsorption Isotherms

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