Coupled fluid-flow and geomechanics for triple-porosity/dual-permeability modeling of coalbed methane recovery

Wei, Zhijie; Zhang, Dongxiao

doi:10.1016/j.ijrmms.2010.08.020

Cited by 133 publications

(54 citation statements)

References 50 publications

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“…21) (another objective of this case is to verify the efficiency of the linear solver in the presence of multi-lateral wells, and the result is presented in Section 2.6). The coupled geomechanic model follows that of Wei and Zhang (2010), with the assumption that the overburden stress is constant and the horizontal strain at the reservoir outer boundaries is zero. The volume strain equation is used as an external module and is sequentially coupled with fluid equations.…”

Section: Case 5 Knudsen Diffusionmentioning

confidence: 99%

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A multi-continuum multiple flow mechanism simulator for unconventional oil and gas recovery

Zhang

2015

Journal of Natural Gas Science and Engineering

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Section: Case 5 Knudsen Diffusionmentioning

confidence: 99%

“…Other model parameters are listed in Table 4. The saturation functions are the same as the illustrative example of Wei and Zhang (2010). For this typical CBM model, the fracture permeability is more sensitive to E than the matrix permeability and has similar sensitivity to ε L with the matrix permeability.…”

Section: Case 5 Knudsen Diffusionmentioning

confidence: 99%

A multi-continuum multiple flow mechanism simulator for unconventional oil and gas recovery

Zhang

2015

Journal of Natural Gas Science and Engineering

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“…Dual-porosity, single permeability model and dual-porosity, dual-permeability model can be used to describe the fluid solid coupled effect for not only the weakly compressible fluid but also the slightly compressible fluid with adsorption mechanism, such as water flowing though fractures in deforming aquifers [1][2][3], naturally fractured reservoirs [4,5], and other mechanical influences. Furthermore, a number of papers have extensively addressed and investigated in the CO 2 sequestration in deep coal seams and coalbed methane recovery with dual porosity or dual permeability model [6][7][8][9][10][11][12][13]. Wu et al used finite element model to quantify the net change in permeability, the gas flow, and the resultant deformation in a prototypical coal seam with a dual poroelastic model [6].…”

Section: Introductionmentioning

confidence: 99%

“…Wu et al used finite element model to quantify the net change in permeability, the gas flow, and the resultant deformation in a prototypical coal seam with a dual poroelastic model [6]. Wei and Zhang [7,8] used finite volume method and fully implicit finite-difference method fully implicit finite-difference method to simulate the coalbed methane (CBM) recovery with a triple-porosity/dual-permeability model, respectively. Masoudian and co-researchers [9][10][11]13] did a lot of work to study the effect of CO 2 injection on reservoir and geomechanical performance of the coal seam in a more comprehensive way.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Coupled Fluid-Flow and Stress in Dual Model Rock Mass with Time-Dependent Effect and Its Simulation

Zhao

Zhang

et al. 2017

Geosciences

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The coupled fluid-flow and stress model with time-dependent effect is developed. In this model, rock mass is simulated as a homogeneous and isotropic dual-porosity, dual-permeability continuum. Darcy's law is used to describe the fluid flow in a porous medium, and cubic law is used to describe the flow in fractures. The finite element method is introduced to solve the system, and the effects of fractures and fracture spacing are considered numerically. The numerical results indicate that fractures have a significant impact on the rocks' displacement and pore pressure. It also shows an increase in plastic strain with decreasing fracture spacing, as does the creep strain. The coupled process is highly sensitive to the fracture spacing. A series of numerical simulations are conducted to better understand the complex coupled processes, which leads to an improved understanding of different aspects of naturally fractured reservoirs and may impact on experimental design to explore these attributes in a real reservoir situation. on modeling fractured formations with the dual-porosity, dual-permeability approach [5,[15][16][17][18]. Some researchers followed the conventional fluid flow modeling coupled with geomechanics through stress dependent rock properties and during the development process [19][20][21]. Considering pore deformation, Valliappan and Khalili-Naghadeh [20] derived a set of coupled differential equations governing the behaviour of fissured porous media. Chen and Teufel [19] focused on theoretical developments with emphasis on the identification of the critical coupling and physical interpretations of the parameters involved. Taking advantage of the joint-mechanics theory, Bagheri and Settari [21] developed general, rigorous coupling between the fluid-flow equation and deformation of fractured media. The need for coupled modeling of hydro-mechanical model has been addressed and investigated in various studies whether the analytical and numerical modelling [22][23][24][25]. For example, Zhang et al. [22] used the finite element method to investigate the effects of fracture spaces on the displacement, stress and pressure in dual-porosity media. However, they neglected the matrix-fracture interaction transfer function. Rutqvist [23] proposed a linked multicontinuum and crack tensor approach for modelling of coupled geomechanics, fluid flow and transport in fractured rock. Hu et al.[25] used a numerical manifold method for analyzing fully coupled hydro-mechanical processes in porous masses with discrete fractures. Some even considered the chemo-hydro-mechanical model for the coupled multiphysics of carbon dioxide sequestration [10,11].Although all of these works provide better extension to the existence theory and models, the long-term creep effect on the matrix with coupled fields is seldom considered. In practice, the time-dependent effect has a great impact on the characteristics of rock material and the stability of rock engineering, such as deep underground rock engineering, high slope engineering, dam ba...

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“…On the one hand, many researchers and reservoir engineers utilize modified porosity and permeability to form analytical formula for simulation and evaluation in different conditions [8,9]. For example, Wei proposed a triple-porosity/dual-permeability model, which considered the effective stress, gas slippage and micropore shrinkage/swelling [10]. Zheng proposed a two-part Hooke's model to consider the geomechanical effects [11].…”

Section: Introductionmentioning

confidence: 99%

Analytical modeling of coupled flow and geomechanics for vertical fractured well in tight gas reservoirs

et al. 2017

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Abstract:The mathematical model of coupled flow and geomechanics for a vertical fractured well in tight gas reservoirs was established. The analytical modeling of unidirectional flow and radial flow was achieved by Laplace transforms and integral transforms. The results show that uncoupled flow would lead to an overestimate in performance of a vertical fractured well, especially in the later stage. The production rate decreases with elastic modulus because porosity and permeability decrease accordingly. Drawdown pressure should be optimized to lower the impact of coupled flow and geomechanics as a result of permeability decreasing. Production rate increases with fracture half-length significantly in the initial stage and becomes stable gradually. This study could provide a theoretical basis for effective development of tight gas reservoirs.

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Coupled fluid-flow and geomechanics for triple-porosity/dual-permeability modeling of coalbed methane recovery

Cited by 133 publications

References 50 publications

A multi-continuum multiple flow mechanism simulator for unconventional oil and gas recovery

A multi-continuum multiple flow mechanism simulator for unconventional oil and gas recovery

Investigation on Coupled Fluid-Flow and Stress in Dual Model Rock Mass with Time-Dependent Effect and Its Simulation

Analytical modeling of coupled flow and geomechanics for vertical fractured well in tight gas reservoirs

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