Coupled fluid flow-geomechanics simulation in stress-sensitive coal and shale reservoirs: Impact of desorption-induced stresses, shear failure, and fines migration

Shovkun, Igor; Espinoza, D. Nicolas

doi:10.1016/j.fuel.2017.01.057

Cited by 61 publications

(26 citation statements)

References 45 publications

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“…Similar conclusion has also been drawn in a previous study on modelling the stress data of Mitra et al (2012) by the authors . Desorption-induced shear failure of coalbeds during gas depletion has been reported in a number of studies (Espinoza et al, 2015;Lu and Connell, 2016;Saurabh et al, 2016;Shovkun and Espinoza, 2017;Saurabh and Harpalani, 2018).…”

Section: Shear Failure Of Coal At Low Pore Pressurementioning

confidence: 92%

Variation in horizontal stress with pore pressure depletion in coal under uniaxial strain conditions: An update on the modelling of laboratory data

Shi

Durucan

2018

International Journal of Coal Geology

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Building upon the previous modelling work on coalbed methane reservoirs by the authors, recently reported experimental horizontal stress data for two coal samples tested under uniaxial strain conditions have been analysed. As well as CH 4 , nonadsorbing Helium has also been used in the experiments. Deviation between the model and the experimental CH 4 stress data at low pore pressures (<3 MPa) are observed, which, as in the previous study, may be attributed to the onset of shear failure experienced by the coal samples. In addition, CO 2 was also used on one of the samples after the CH 4 experiment. The post-failure CO 2 stress data could be matched using a combination of a reduced Young's Modulus and an increased Poisson's ratio. The results of this study have provided further evidence for the validity of the equation for computing the changes in the effective horizontal stress in producing coalbed reservoirs, which forms an integral part of the Shi and Durucan permeability model.

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Section: Shear Failure Of Coal At Low Pore Pressurementioning

confidence: 92%

Variation in horizontal stress with pore pressure depletion in coal under uniaxial strain conditions: An update on the modelling of laboratory data

Shi

Durucan

2018

International Journal of Coal Geology

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“…Many previous works have been performed to understand the characteristics of gas flow and stress sensitivity in shale gas [1][2][3]. Huang et al [1] shows that gas transportation in shale cannot be simply characterized by the Darcy law, and a method by calculating the Knudsen number was proposed to analyze the shale gas flow regime.…”

Section: Introductionmentioning

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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“…They indicated that the selection of the correlation for the stress-dependent permeability significantly affects the field production performance. Shovkun and Espinoza applied an empirical correlation between horizontal permeability, compressibility, and stress to their coupled flow-geomechanics simulator for shale reservoir, and pointed out that the degree of the permeability alteration due to its stress sensitivity varies with location in the reservoir: near-well locations have stronger stress changes due to production while far-field locations have smaller stress changes due to production [20]. While these researches provide insights in numerical investigations of stress sensitive reservoir rocks, limitations of these previous numerical studies are observed.…”

Section: Introductionmentioning

confidence: 99%

“…While these researches provide insights in numerical investigations of stress sensitive reservoir rocks, limitations of these previous numerical studies are observed. In An et al [19] and Shovkun and Espinoza [20], the numerical methods for the geomechanics modeling only consider linear elasticity, implying that these numerical methods could not describe the nonlinear elastic behaviors as rocks are being compacted and consolidated due to in-situ stresses changes and hydrocarbon depletion in the reservoir. The correlations between rock deformation and stress sensitive rock properties were theoretically derived and they lack the validation with field/experimental results, indicating that their methods work for theoretical analysis but have limitations when it comes to realistic shale rocks [19,20].…”

Section: Introductionmentioning

confidence: 99%

A Study of Nonlinear Elasticity Effects on Permeability of Stress Sensitive Shale Rocks Using an Improved Coupled Flow and Geomechanics Model: A Case Study of the Longmaxi Shale in China

Wei

Wang²,

et al. 2018

Energies

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Gas transport in shale gas reservoirs is largely affected by rock properties such as permeability. These properties are often sensitive to the in-situ stress state changes. Accurate modeling of shale gas transport in shale reservoir rocks considering the stress sensitive effects on rock petrophysical properties is important for successful shale gas extraction. Nonlinear elasticity in stress sensitive reservoir rocks depicts the nonlinear stress-strain relationship, yet it is not thoroughly studied in previous reservoir modeling works. In this study, an improved coupled flow and geomechanics model that considers nonlinear elasticity is proposed. The model is based on finite element methods, and the nonlinear elasticity in the model is validated with experimental data on shale samples selected from the Longmaxi Formation in Sichuan Basin China. Numerical results indicate that, in stress sensitive shale rocks, nonlinear elasticity affects shale permeability, shale porosity, and distributions of effective stress and pore pressure. Elastic modulus change is dependent on not only in-situ stress state but also stress history path. Without considering nonlinear elasticity, the modeling of shale rock permeability in Longmaxi Formation can overestimate permeability values by 1.6 to 53 times.

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Coupled fluid flow-geomechanics simulation in stress-sensitive coal and shale reservoirs: Impact of desorption-induced stresses, shear failure, and fines migration

Cited by 61 publications

References 45 publications

Variation in horizontal stress with pore pressure depletion in coal under uniaxial strain conditions: An update on the modelling of laboratory data

Variation in horizontal stress with pore pressure depletion in coal under uniaxial strain conditions: An update on the modelling of laboratory data

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

A Study of Nonlinear Elasticity Effects on Permeability of Stress Sensitive Shale Rocks Using an Improved Coupled Flow and Geomechanics Model: A Case Study of the Longmaxi Shale in China

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