A new rate-transient analysis model for shale gas reservoirs coupled the effect of slip flow and surface diffusion

Miao, Yuqing; Li, Xiangfang; Yu, Zhou; Lee, John; Sun, Zheng; Chang, Yucui; Wang, Shan; Hou, Chenhong

doi:10.1016/j.ijheatmasstransfer.2018.03.050

Cited by 27 publications

(10 citation statements)

References 55 publications

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“…As analyzed in the aforementioned context, there are some differences in gas transport capacity for nanopores with different pore shapes. However, to date, nearly all of the production prediction models or related commercial software for shale gas recovery are based on a frequently utilized assumption; i.e., nanopore cross-sections in shale matrix are circles. − In order to enhance the rationality and accuracy of current production prediction models, it is necessary to take the effect of pore shapes on gas transport capacity into account, which directly affects gas production performance. In this section, the error caused by assuming nanopores with elliptical nanopores as circular nanopores will be quantified.…”

Section: Discussion About the Frequently Utilized Assumption In Shale...mentioning

confidence: 99%

Effect of Pore Shape on Nanoconfined Gas Flow Behavior: Implication for Characterizing Permeability of Realistic Shale Matrix

Shi

Sun

et al. 2019

Ind. Eng. Chem. Res.

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Good knowledge of nanoconfined gas flow behavior will significantly contribute to advance ultimate gas recovery from shale gas reservoirs. However, up to now, it has still been extremely challenging to have a clear understanding of the key issue. In particular, little attention is drawn to the effect of pore geometry on nanoconfined gas flow behavior. By means of developed experimental technology, realistic images reflecting pore characteristics can be obtained, which demonstrate that various pore shapes are exhibited in the shale matrix. To my knowledge, current related research is focused on gas transport through several conventional pore shapes, including circle, rectangle, and slit. As a result, the urgent issue, i.e., research on gas flow behavior through unconventional pore shapes, is highlighted. In this work, a model for gas transport through elliptical nanopores is established, which possesses an excellent varying-shape nature with changing aspect ratio (AR) and therefore covers lots of pore shapes and shares great application value. Both effects of gas slipperiness and surface diffusion are incorporated in this model. Moreover, the Langmuir isotherm is utilized to quantify the thickness of the adsorption layer of methane. When AR is equal to 1 and an infinite number, the proposed model can achieve excellent agreement compared with gas transport data through circular and slit-like nanopores. Results show that (a) the gas transport capacity will decrease with increasing AR value at a specific pressure point; (b) contribution of surface diffusion will become more prominent with higher AR value; (c) under different gas adsorption/desorption characteristics, there is no difference in gas transport capacity through nanopores with different ARs at high pressure and relatively large difference at low-pressure atmosphere; (d) current production prediction models or commercial software require consideration of the effect of various pore shapes to enhance application accuracy. In sum, the findings of this study can help in better understanding the methane flow feature through nanopores with various cross-sections, which further serve as the necessary theoretical attempt with regard to accurate characterization for flow capacity of a realistic shale matrix.

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Section: Discussion About the Frequently Utilized Assumption In Shale...mentioning

confidence: 99%

Effect of Pore Shape on Nanoconfined Gas Flow Behavior: Implication for Characterizing Permeability of Realistic Shale Matrix

Shi

Sun

et al. 2019

Ind. Eng. Chem. Res.

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“…30 Later on, several authors tried to improve the accuracy of predictions by including and/or modifying pseudovariables. 31,32 As noted earlier, several mechanisms play role in gas transport through shale media. Developing a comprehensive model, which can capture the effects of all of the contributing mechanisms, especially at the field scale is a complicated task and the computational demand is high.…”

Section: Introductionmentioning

confidence: 91%

“…The square-root-of-time plot for linear flow, which is the dominant flow regime in shale gas reservoirs, has been introduced to evaluate parameters such as permeability . Later on, several authors tried to improve the accuracy of predictions by including and/or modifying pseudovariables. , …”

Section: Introductionmentioning

confidence: 99%

Estimation of Shale Apparent Permeability for Multimechanistic, Multicomponent Gas Production Using Rate Transient Analysis

Mohagheghian

Chen

2019

Energy Fuels

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Gas-producing shale and ultratight reservoirs are playing a key role in the energy industry and the global gas market. Compositional simulation of gas production from shale media in the presence of different mechanisms such as viscous flow, slip flow (Klinkenberg effect), Knudsen diffusion, sorption, pore radius variation, and real gas effect is a computational challenge. In this work, we present a model that takes into account all of the noted mechanisms of gas transport in shale media. It is shown that the compositional effect of gas in shale media can be lumped into a single component by introducing an apparent gas permeability, which can be estimated from the conventional rate transient analysis. The main contribution of this study is a workflow incorporating the relevant physics into a single term (apparent permeability) that will substitute the Darcy permeability. This procedure reduces the simulation runtime substantially and will find applications in reservoir characterization and simulation of production from shale gas reservoirs.

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“…Wu et al derived the model of surface diffusion under a low‐pressure condition and considered the effect of adsorbed gas coverage under high pressure based on Hwang's model, and they found that the contribution of surface diffusion to the gas mass transfer is dominant in micropores. These researchers mainly focused on pore‐scale modeling or rate‐transient analysis . Nevertheless, little work has been done to investigate the effect of surface diffusion on gas production of MSFHWs for shale gas reservoirs.…”

Section: Introductionmentioning

confidence: 99%

“…These researchers mainly focused on porescale modeling or rate-transient analysis. 7 Nevertheless, little work has been done to investigate the effect of surface diffusion on gas production of MSFHWs for shale gas reservoirs.…”

Section: Introductionmentioning

confidence: 99%

A novel numerical model of gas transport in multiscale shale gas reservoirs with considering surface diffusion and Langmuir slip conditions

Huang

Cao

Yuan

et al. 2019

Energy Science & Engineering

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Multiflow mechanisms coexist in shale gas reservoirs (SGRs) due to the abundant nanopores and the organic matter as a medium of gas souring and storage. The gas transport mechanisms in nanopores including bulk gas transfer and adsorption‐gas surface diffusion were already investigated in pore‐scale models, but their effects on actual gas production of multistage fractured horizontal wells in SGRs are not clearly understood, which are crucial for the economic development of unconventional resources. Therefore, a comprehensive apparent permeability (AP) model which couples the surface diffusion of adsorbed gas, slippage flow considering the additional flux generated by surface diffusion based on Langmuir's theory, and Knudsen diffusion is established. The presented model is validated with the experimental data and lattice Boltzmann method (LBM) simulation results. Then, we propose a numerical model which combines multiflow mechanisms in microscale pores and a multistage fractured horizontal well (MSFHW) in macroscale shale gas reservoirs together. The effects of different transport mechanisms on both AP of nanopores and gas production are analyzed thoroughly. The results show that the effect of surface diffusion on the apparent permeability of nanopores is much greater than that on the actual gas production of MSFHW, and the influence of high‐pressure condition must be considered when calculating the surface diffusion coefficient. The presented numerical model has important implications for accurate numerical simulation and efficient development of shale gas reservoirs.

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A new rate-transient analysis model for shale gas reservoirs coupled the effect of slip flow and surface diffusion

Cited by 27 publications

References 55 publications

Effect of Pore Shape on Nanoconfined Gas Flow Behavior: Implication for Characterizing Permeability of Realistic Shale Matrix

Effect of Pore Shape on Nanoconfined Gas Flow Behavior: Implication for Characterizing Permeability of Realistic Shale Matrix

Estimation of Shale Apparent Permeability for Multimechanistic, Multicomponent Gas Production Using Rate Transient Analysis

A novel numerical model of gas transport in multiscale shale gas reservoirs with considering surface diffusion and Langmuir slip conditions

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