A fully coupled multidomain and multiphysics model for evaluation of shale gas extraction

Li, Wai; Liu, Jishan; Zeng, Jie; Leong, Yee-Kwong; Elsworth, Derek; Tian, Jianwei; Li, Lin

doi:10.1016/j.fuel.2020.118214

Cited by 89 publications

(50 citation statements)

References 70 publications

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“…For shale gas reservoirs, the content of clay minerals is as high as 30%-50% or even more (Li et al 2020b;Yang et al 2014;Zou et al 2010). Wellbore instability incidents, such as wellbore collapse, stuck pipe, tight hole, excessive hole, frequently occur.…”

Section: Introductionmentioning

confidence: 99%

Laponite: a promising nanomaterial to formulate high-performance water-based drilling fluids

et al. 2020

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High-performance water-based drilling fluids (HPWBFs) are essential to wellbore stability in shale gas exploration and development. Laponite is a synthetic hectorite clay composed of disk-shaped nanoparticles. This paper analyzed the application potential of laponite in HPWBFs by evaluating its shale inhibition, plugging and lubrication performances. Shale inhibition performance was studied by linear swelling test and shale recovery test. Plugging performance was analyzed by nitrogen adsorption experiment and scanning electron microscope (SEM) observation. Extreme pressure lubricity test was used to evaluate the lubrication property. Experimental results show that laponite has good shale inhibition property, which is better than commonly used shale inhibitors, such as polyamine and KCl. Laponite can effectively plug shale pores. It considerably decreases the surface area and pore volume of shale, and SEM results show that it can reduce the porosity of shale and form a seamless nanofilm. Laponite is beneficial to increase lubricating property of drilling fluid by enhancing the drill pipes/wellbore interface smoothness and isolating the direct contact between wellbore and drill string. Besides, laponite can reduce the fluid loss volume. According to mechanism analysis, the good performance of laponite nanoparticles is mainly attributed to the disk-like nanostructure and the charged surfaces.

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Section: Introductionmentioning

confidence: 99%

Laponite: a promising nanomaterial to formulate high-performance water-based drilling fluids

et al. 2020

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“…Coal bed methane (CBM) is an essential part of the world's clean energy mix (Øren and Bakke, 2002). Fracture and pore structure are extremely complex, which is the key factor affecting the migration behavior of coalbed methane Li et al, 2018;Zeng et al, 2020). In the process of CBM extraction, various factors affect the fracture and pore structure of a coal seam, such as gas adsorption-desorption, the thermal conductivity of the coal seam, the long-term effects of ground stress, and extruded deformation, which has an obvious impact on permeability (Arand and Hesser, 2017;Li et al, 2020;.…”

Section: Introductionmentioning

confidence: 99%

“…Fracture and pore structure are extremely complex, which is the key factor affecting the migration behavior of coalbed methane Li et al, 2018;Zeng et al, 2020). In the process of CBM extraction, various factors affect the fracture and pore structure of a coal seam, such as gas adsorption-desorption, the thermal conductivity of the coal seam, the long-term effects of ground stress, and extruded deformation, which has an obvious impact on permeability (Arand and Hesser, 2017;Li et al, 2020;. The contribution and evolution of coal seam microstructure in the migration and extraction of coalbed methane is thus of great theoretical and engineering significance (Barton and Hsieh, 1989;Kulatilake et al, 1995;Qin et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

A multi-field coupling model of gas flow in fractured coal seam

Liu

Gao

et al. 2021

Adv. Geo-Energy Res.

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The structure of fractures and pores has a dominant impact on the heat transfer-seepagedeformation process of a coal seam. Previous models have primarily used the cubic permeability model to characterize coal seam permeability properties. In this study, we developed a new multi-field coupling model, which includes fracture and pore structure, coal seam temperature, effective stress and gas seepage. Two major extraction scenarios were simulated: the unconstrained plane strain state and the uniaxial plane strain state. In addition, two microstructural parameters were applied to characterize coal permeability: the maximum fracture length and the fractal dimension for the fracture. The results show that the fractal seepage model provides a more realistic and reliable characterization of resource migration and extraction processes in unconventional reservoirs than the cubic-law permeability model. Compared with the cubic-law permeability model, the permeability calculated by the model proposed in this paper changes about 17.09%-91.56%. Furthermore, coal seam permeability is proportional to the maximum fracture length and the fractal dimension for the fracture. The permeability changes about 17.09% and 17.18% with the different fractal dimension, and about 87.17% and 91.56% with the different maximum fracture length. However, the fractal dimension and coal seam permeability are inversely proportional to seam temperature.

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“…Van Stappen et al [12] also connected the seepage model with fracture opening by determining the relationship between fracture permeability and confining pressure. Li et al [13,14] broke away from the traditional practice of thinking fractured reservoirs as dual media and established a percolation model with equivalent continuum suitable for low-permeability fractured shale reservoirs. De Dreuzy et al [15] studied the permeability of randomly generated two-dimensional fracture network by numerical and theoretical methods and compared it with natural fractures to verify the accuracy of the model.…”

Section: Introductionmentioning

confidence: 99%

A Complex Network Model for Analysis of Fractured Rock Permeability

Zhu

Liu

Gao

et al. 2020

Advances in Civil Engineering

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Fractured rocks exist widely in nature. The fracture network is an effective storage space and main seepage channel of low-permeability oil and gas reservoirs, which controls the seepage system of low-permeability oil and gas reservoirs. The connection characteristics of fracture networks are complex and evolve dynamically with time. The rise of complex network research can provide reliable analysis for the relationship between network structures and network behaviors. In this work, the fracture network is considered as a hierarchical network with self-similarity, and complex network theory is applied to analyze the permeability of fractured rocks. According to the power-law relationship of degree distribution of network nodes, the number of nodes is corresponding to the number of network edges and a new power-law distribution relationship of edges with degree of nodes is proposed. Eventually, the permeability model of fractured rocks is derived and it is found that permeability of fractured rocks is a function of degree of maximum node k max , self-similarity index γ , power index d k , and other structural parameters. Compared with the existing numerical simulations, the validity of the model is verified. By calculating the influence of model parameters on the permeability, the following results are obtained: (1) fracture porosity is directly proportional to permeability; (2) fracture surface density is linearly increasing with permeability; (3) power index is inversely proportional to permeability; and (4) permeability is exponentially increasing with the maximum degree of a node.

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A fully coupled multidomain and multiphysics model for evaluation of shale gas extraction

Cited by 89 publications

References 70 publications

Laponite: a promising nanomaterial to formulate high-performance water-based drilling fluids

Laponite: a promising nanomaterial to formulate high-performance water-based drilling fluids

A multi-field coupling model of gas flow in fractured coal seam

A Complex Network Model for Analysis of Fractured Rock Permeability

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