Study on the steady and transient pressure characteristics of shale gas reservoirs

Deng, Jia; Zhu, Weiyao; Qian, Quan; Tian, Wei; Yue, Ming

doi:10.1016/j.jngse.2015.03.016

Cited by 19 publications

(3 citation statements)

References 5 publications

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“…When K n exceeds 10, the gas transport in the nanopores is the Knudsen diffusion 40–43 . The regime is controlled by Knudsen diffusion, and it may be expressed aswhere K n is the Knudsen number for real gas; is the mean free path of the molecules for real gas, .…”

Section: Resultsmentioning

confidence: 99%

Experimental study on flow characteristics of gas transport in micro- and nanoscale pores

Shen

Song

et al. 2019

Sci Rep

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Gas flow behavior in porous media with micro- and nanoscale pores has always been attracted great attention. Gas transport mechanism in such pores is a complex problem, which includes continuous flow, slip flow and transition flow. In this study, the microtubes of quartz microcapillary and nanopores alumina membrane were used, and the gas flow measurements through the microtubes and nanopores with the diameters ranging from 6.42 μm to 12.5 nm were conducted. The experimental results show that the gas flow characteristics are in rough agreement with the Hagen-Poiseuille (H-P) equation in microscale. However, the flux of gas flow through the nanopores is larger than the H-P equation by more than an order of magnitude, and thus the H-P equation considerably underestimates gas flux. The Knudsen diffusion and slip flow coexist in the nanoscale pores and their contributions to the gas flux increase as the diameter decreases. The slip flow increases with the decrease in diameter, and the slip length decreases with the increase in driving pressure. Furthermore, the experimental gas flow resistance is less than the theoretical value in the nanopores and the flow resistance decreases along with the decrease in diameter, which explains the phenomenon of flux increase and the occurrence of a considerable slip length in nanoscale. These results can provide insights into a better understanding of gas flow in micro- and nanoscale pores and enable us to exactly predict and actively control gas slip.

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Section: Resultsmentioning

confidence: 99%

Experimental study on flow characteristics of gas transport in micro- and nanoscale pores

Shen

Song

et al. 2019

Sci Rep

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“…So, an apparent permeability model based on Beskok-Karniadakis (BK model) theory is widely used to characterize the multiscale transport of shale gas [19][20][21][22][23][24], and the model can be expressed as follows:…”

Section: Apparent Permeability Model With Stress Sensitivitymentioning

confidence: 99%

Numerical Simulation of Shale Gas Multiscale Seepage Mechanism-Coupled Stress Sensitivity

Yan

Sun

Liu

2019

Journal of Chemistry

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The complexity of the gas transport mechanism in microfractures and nanopores is caused by the feature of multiscale and multiphysics. Figuring out the flow mechanism is of great significance for the efficient development of shale gas. In this paper, an apparent permeability model which covers continue, slip, transition, and molecular flow and geomechanical effect was presented. Additionally, a mathematical model comprising multiscale, geomechanics, and adsorption phenomenon was proposed to characterize gas flow in the shale reservoir. The aim of this paper is to investigate some important impacts in the process of gas transportation, which includes the shale stress sensitivity, adsorption phenomenon, and reservoir porosity. The results reveal that the performance of the multistage fractured horizontal well is strongly influenced by stress sensitivity coefficient. The cumulative gas production will decrease sharply when the shale gas reservoir stress sensitivity coefficient increases. In addition, the adsorption phenomenon has an influence on shale gas seepage and sorption capacity; however, the effect of adsorption is very weak in the early gas transport period, and the impact of later will increase. Moreover, shale porosity also greatly affects the shale gas transportation.

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“…Thirdly, patterns of shale gas migration play an important role in describing shale gas percolation accurately. It is found that the classic Darcy percolation law cannot accurately describe shale gas behavior especially in nanopores and under different gas states so that desorption, diffusion and slippage, viscous flow of shale gas in pores, Knudsen diffusion and surface diffusion of adsorbed gas, adsorption/desorption, matrix-fracture transfer, and non-Darcy effects [15][16][17][18][19][20] are introduced to describe the percolation law of shale gas; then, the percolation effect between matrix and fractures through percolation velocity, reservoir pressure, and production was analyzed. Fourthly, the improvement of the mathematical calculation method is another key point, such as the lattice Boltzmann method (LBM), finite element method, and finite volume method [14,21,22] which are introduced to improve the accuracy of gas percolation representation considering adsorptive/cohesive forces between the molecules and fracture network distribution.…”

Section: Introductionmentioning

confidence: 99%

Role of Gas Viscosity for Shale Gas Percolation

Wang

Chen²,

Ren³

et al. 2020

Geofluids

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Viscosity is an important index to evaluate gas flowability. In this paper, a double-porosity model considering the effect of pressure on gas viscosity was established to study shale gas percolation through reservoir pressure, gas velocity, and bottom hole flowing pressure. The experimental results show that when pressure affects gas viscosity, shale gas viscosity decreases, which increases the percolation velocity and pressure drop velocity of the free state shale gas in matrix and fracture systems. And it is conducive to the desorption of adsorbed shale gas and effectively supplemented the bottom hole flowing pressure with the pressure wave propagation range and velocity increasing, so that the rate of pressure drop at the bottom of the well slows down, which makes the time that bottom hole flowing pressure reaches stability shortened. Therefore, the gas viscosity should be fully considered when studying the reservoir gas percolation.

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Study on the steady and transient pressure characteristics of shale gas reservoirs

Cited by 19 publications

References 5 publications

Experimental study on flow characteristics of gas transport in micro- and nanoscale pores

Experimental study on flow characteristics of gas transport in micro- and nanoscale pores

Numerical Simulation of Shale Gas Multiscale Seepage Mechanism-Coupled Stress Sensitivity

Role of Gas Viscosity for Shale Gas Percolation

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