Influence of coupled chemo-poro-thermoelastic processes on pore pressure and stress distributions around a wellbore in swelling shale

Ghassemi, Ahmad; Tao, Qingfeng; Diek, A.

doi:10.1016/j.petrol.2009.02.015

Cited by 82 publications

(32 citation statements)

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“…In this paper, the clay material as solid phase is considered for numerical computation and analysis, and the specific heat -elastic material parameters (clay) are taken from the References [3,6,7], i.e.,:f= 0.375,G = 1.2MPa,ν = 0.2,K = 1.6M Pa,µ=1.0×10-3Pa⋅s,k = 5.0×10-17m2,a = 1.0,B = 1.0,ρs = 2600kg/m3,ρf = 1000kg/m3,cs = 937J/(kg0C),cf = 4200J/(kg0C),kTs =3.3W/(m0C), kTf =0.6W/(m0C), as= 3.0×10-5/0C, af =as = 3.0×10-4/0C. The chemical parameters refer to the References [8][9][10][11]: =100MPa, , ,Vs=3.36×10-5 m3/mol (Nacl solute), Vf =1.8×10-5 m3/mol (hydrosolvent), χ=0.9, R=8.314J/0C-mol, Dc=2.0×10-9m2/s, DTs= DTf = 1.5×10-9m2/s, a = 0.5m. The relevant material parameters of isotropic saturated porous media are set as constant, and calculated as follows: c,=3.72×102Pa/0C, κ=4.812×10-7 m2/s, b3=0.3553.…”

Section: Numerical Resultsmentioning

confidence: 99%

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Analysis of the Chemo-thermal Stresses around a Spherical Cavity in a Saturated Porous Medium

Xue¹,

Chen²,

He³

2015

Proceedings of the 2015 International Conference on Materials, Environmental and Biological Engineering

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Abstract. In this paper, based on the chemo-thermo-poroelasticity model of saturated porous medium undergoing the local thermal non-equilibrium (LTNE) conditions, the pore pressure and chemo-thermal stresses around a spherical cavity in an infinite fluid saturated porous medium subjected to sudden variations for temperature and solute mole fraction on the cavity boundary are investigated by employing Laplace transform technique and numerical method. The results show that the pore pressure and stresses are dominantly affected by the chemical effect rather than the thermal effect when the temperature and variation of the solute mole fraction change together, and the LTNE effects on radial stress (magnitude) become very pronounced when Sp is small (≈0.35) and Bi is moderate (≈1.0). In addition, the pore pressure and stresses are always same order of magnitude whether considering the chemical effect or the chemo-thermal effect.

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Section: Numerical Resultsmentioning

confidence: 99%

“…For the pore fluid/solution (consisting of two components for solvent and solute), Ekbote and Abousleiman [8,9] and Ghassemi and Diek [10,11] respectively established a chemo-thermalporoelasticity model of saturated porous medium under the LTE conditions. The difference between two models is that the study objects are different.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Chemo-thermal Stresses around a Spherical Cavity in a Saturated Porous Medium

Xue¹,

Chen²,

He³

2015

Proceedings of the 2015 International Conference on Materials, Environmental and Biological Engineering

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“…We assume the hydraulic fractures are evenly spaced. The inputs of the reservoir, fracture, fluid and heat properties [35,36,[55][56][57][58] are given in Table 1.…”

Section: Simulation Model Descriptionmentioning

confidence: 99%

Coupled Thermo-Hydro-Mechanical-Chemical Modeling of Water Leak-Off Process during Hydraulic Fracturing in Shale Gas Reservoirs

Wang

Zhang

2017

Energies

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Abstract:The water leak-off during hydraulic fracturing in shale gas reservoirs is a complicated transport behavior involving thermal (T), hydrodynamic (H), mechanical (M) and chemical (C) processes. Although many leak-off models have been published, none of the models fully coupled the transient fluid flow modeling with heat transfer, chemical-potential equilibrium and natural-fracture dilation phenomena. In this paper, a coupled thermo-hydro-mechanical-chemical (THMC) model based on non-equilibrium thermodynamics, hydrodynamics, thermo-poroelastic rock mechanics, and non-isothermal chemical-potential equations is presented to simulate the water leak-off process in shale gas reservoirs. The THMC model takes into account a triple-porosity medium, which includes hydraulic fractures, natural fractures and shale matrix. The leak-off simulation with the THMC model involves all the important processes in this triple-porosity medium, including: (1) water transport driven by hydraulic, capillary, chemical and thermal osmotic convections; (2) gas transport induced by both hydraulic pressure driven convection and adsorption; (3) heat transport driven by thermal convection and conduction; and (4) natural-fracture dilation considered as a thermo-poroelastic rock deformation. The fluid and heat transport, coupled with rock deformation, are described by a set of partial differential equations resulting from the conservation of mass, momentum, and energy. The semi-implicit finite-difference algorithm is proposed to solve these equations. The evolution of pressure, temperature, saturation and salinity profiles of hydraulic fractures, natural fractures and matrix is calculated, revealing the multi-field coupled water leak-off process in shale gas reservoirs. The influences of hydraulic pressure, natural-fracture dilation, chemical osmosis and thermal osmosis on water leak-off are investigated. Results from this study are expected to provide a better understanding of the predominant leak-off mechanisms for slickwater fracturing-fluids in hydraulically fractured shale gas reservoirs.

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“…Previous researchers have also studied the combination chemical potential and thermal osmosis effects on wellbore stability, for example, two sets of coupling theories were established and analytical solutions were provided independently by Ekbote (2002) and Ghassemi et al (2009), Tao et al (2005); Tao and Ghassemi (2006).…”

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confidence: 99%

Pore pressure and stress distribution analysis around an inclined wellbore in a transversely isotropic formation based on the fully coupled chemo-thermo-poroelastic theory

Cao

Deng

Liu

et al. 2017

Journal of Natural Gas Science and Engineering

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a b s t r a c tWellbore instability is a widespread problem when drilling in shale formations, particularly with waterbased drilling fluid. The main reason for the occurrence of wellbore instability is that stress concentration and pore pressure redistribution occur around the wellbore once a hole is drilled; current studies show that the drilling fluid temperature and solute mass fraction play important roles during the process. In this work, a non-linear fully coupled chemo-thermo-poroelastic finite element model is developed to quantitatively access thermal and chemical effects on time-dependent pore pressure and effective stresses; in addition, material constant sensitivity analysis of an inclined well drilled in a transversely isotropic formation is presented. The results reveal the following: fluid transfer is greatly affected by thermal and chemical osmosis, the lower temperature and higher solute mass fraction of the drilling fluid contribute to decreasing the pore pressure and are beneficial for wellbore stability, and thermal parameters (such as thermal osmosis coefficient and thermal diffusivity) and chemical parameters (such as reflection coefficient and solute diffusion coefficient) have high effects on the pore pressure and effective stresses. Anisotropy ratio analysis of the material constants indicates that the pore pressure and effective stresses are very sensitive to Young's modulus and the permeability ratio, but are not sensitive to Poisson's ratio. Therefore, the developed coupled chemo-thermo-poroelastic theory illustrates that optimization of the reduction of the drilling fluid temperature while maintaining a high solute mass fraction could enhance wellbore stability.

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Influence of coupled chemo-poro-thermoelastic processes on pore pressure and stress distributions around a wellbore in swelling shale

Cited by 82 publications

References 19 publications

Analysis of the Chemo-thermal Stresses around a Spherical Cavity in a Saturated Porous Medium

Analysis of the Chemo-thermal Stresses around a Spherical Cavity in a Saturated Porous Medium

Coupled Thermo-Hydro-Mechanical-Chemical Modeling of Water Leak-Off Process during Hydraulic Fracturing in Shale Gas Reservoirs

Pore pressure and stress distribution analysis around an inclined wellbore in a transversely isotropic formation based on the fully coupled chemo-thermo-poroelastic theory

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