Coupled modeling of multiphase flow and poro-mechanics for well operations on fault slip and methane production

Ma, Tianran; Xu, Hao; Liu, Weiqun; Zhang, Zhizhen; Yang, Yongjie

doi:10.1007/s00707-020-02709-4

Cited by 11 publications

(2 citation statements)

References 40 publications

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“…Yang et al (2014) developed a fully coupled geomechanics and multiphase flow solver that can model the processes of rock deformation and multiphase flow in the heterogeneous porous media. Ma et al (2020) used a coupled two-phase flow and geomechanical model to understand methane production during the CO 2 -enhanced coalbed methane. Consequently, considering the coupling of geomechanics and fluid flow is crucial for the aforementioned phenomena and performing the accurate simulations in the porous reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Multiphysics coupling study of near-wellbore and reservoir models in ultra-deep natural gas reservoirs

Cheng

Shen

et al. 2022

J Petrol Explor Prod Technol

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Understanding the changes of the near-wellbore pore pressure associated with the reservoir depletion is greatly significant for the development of ultra-deep natural gas reservoirs. However, there is still a great challenge for the fluid flow and geomechanics in the reservoir depletion. In this study, a fully coupled model was developed to simulate the near-wellbore and reservoir physics caused by pore pressure in ultra-deep natural gas reservoirs. The stress-dependent porosity and permeability models as well as geomechanics deformation induced by pore pressure were considered in this model, and the COMSOL Multiphysics was used to implement and solve the problem. The numerical model was validated by the reservoir depletion from Dabei gas field in China, and the effects of reservoir properties and production parameters on gas production, near-wellbore pore pressure and permeability evolution were discussed. The results show that the gas production rate increases nonlinearly with the increase in porosity, permeability and Young’s modulus. The lower reservoir porosity will result in the greater near-wellbore pore pressure and the larger rock deformation. The permeability changes have little effect on geomechanics deformation while it affects greatly the gas production rate in the reservoir depletion. With the increase in the gas production rate, the near-wellbore pore pressure and permeability decrease rapidly and tend to balance with time. The reservoir rocks with higher deformation capacity will cause the greater near-wellbore pore pressure.

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Section: Introductionmentioning

confidence: 99%

Multiphysics coupling study of near-wellbore and reservoir models in ultra-deep natural gas reservoirs

Cheng

Shen

et al. 2022

J Petrol Explor Prod Technol

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“…The geological fault structures are recognized as the reason of earthquakes, seism, gas leakage, and outburst [1][2][3][4][5]. The gas burst accidents in the Beipiao mining area, Jiaozuo mining area, Yangquan mining area, and Huainan mining area, etc.…”

Section: Introductionmentioning

confidence: 99%

The Role of the Reverse Fault on the Permeability Evolution in Mining Coal

Zhou

Qin

2021

Geofluids

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To prevent and control the coal seam gas disaster affected by the reverse fault, we performed gas seepage tests, which consider stress-loading and unloading schemes, to investigate the stress change and coal permeability of the mining coal with reverse fault. The experimental results show that the mechanical behavior and permeability change of the mining coal are related to the distance between the coal and the reverse fault. The stress concentration coefficient of the coal body gradually increases. The closer is the distance between the coal and the reverse fault, the larger are the deviatoric stress peak and strain. In comparison with the coal sample M1 that is 5 m away from the reverse fault, the deviatoric stress peak and axial strain of the coal sample M3, 35 m away from the reverse fault, increase by 40.74% and 26.73%, respectively. In this stage, the permeability of M1, M2, and M3 coal samples increases by 22.1%, 28.0%, and 36.7%, respectively. In another stage, the stress concentration coefficient of coal increases to the peak and then decreases, causing the deviatoric stress peak and strain of coal to rise first and then fall. In comparison with the coal sample M4 that is 65 m away from the reverse fault, the deviatoric stress peak and axial strain of coal sample M6, 5 m away from the reverse fault, decrease by 29.48% and 5.55%, respectively. The permeability of coal samples M4, M5, and M6 increases by 23.6%, 37.2%, and 20.8%, respectively. Based on the gas seepage test results, we established the permeability model of mining-induced coal under the influence of a reverse fault, with consideration of the volume changes of coal fractures induced by adsorption and desorption. In the model, the variations of permeability in both stages of the prepeak and postpeak were deduced, which was verified with the experimental data. The verification results demonstrate that the proposed model has the capacity to predict the permeability evolution of mining coal under the influence of a reverse fault.

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Coupled hydro-mechanical two-phase flow model in fractured porous medium with the combined finite-discrete element method

Sun,

Tang,

Aboayanah

et al. 2024

Engineering with Computers

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Coupled modeling of multiphase flow and poro-mechanics for well operations on fault slip and methane production

Cited by 11 publications

References 40 publications

Multiphysics coupling study of near-wellbore and reservoir models in ultra-deep natural gas reservoirs

Multiphysics coupling study of near-wellbore and reservoir models in ultra-deep natural gas reservoirs

The Role of the Reverse Fault on the Permeability Evolution in Mining Coal

Coupled hydro-mechanical two-phase flow model in fractured porous medium with the combined finite-discrete element method

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