Integrated discrete fracture and dual porosity - Dual permeability models for fluid flow in deformable fractured media

Rueda, Julio; Mejia, Cristian; Roehl, Deane

doi:10.1016/j.petrol.2018.12.053

Cited by 36 publications

(12 citation statements)

References 25 publications

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“…Li et al [56] developed a novel simulation method that integrates discrete fracture and dual-continuous models to simulate a complex fracture network with multiple orientations and length scales induced by hydraulic fracturing. Cordero et al [57] also integrated the discrete fracture and dual-continuous models to simulate flow in fractured reservoirs, but while taking into account geomechanical effects. Flemisch et al [58] proposed a computational benchmark for single-phase flow in fractured porous media to compare several discrete-fracture-matrix methods.…”

Section: Introductionmentioning

confidence: 99%

Reactive Transport Model of Gypsum Karstification in Physically and Chemically Heterogeneous Fractured Media

et al. 2022

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Gypsum dissolution leads to the development of karstic features within much shorter timescales than in other sedimentary rocks, potentially leading to rapid deterioration of groundwater quality and increasing the risk of catastrophes caused by subsidence. Here, we present a 2-D reactive transport model to evaluate gypsum karstification in physically and chemically heterogeneous systems. The model considers a low-permeability rock matrix composed mainly of gypsum and a discontinuity (fracture), which acts as a preferential water pathway. Several scenarios are analyzed and simulated to investigate the relevance for gypsum karstification of: (1) the dynamic update of flow and transport parameters due to porosity changes; (2) the spatial distribution of minerals in the rock matrix; (3) the time evolution of water inflows through the boundaries of the model; (4) the functions relating permeability, k, to porosity, ϕ. The average porosity of the matrix after 1000 years of simulation increases from 0.045 to 0.29 when flow, transport, and chemical parameters and the water inflows through the boundary are dynamically updated according to the porosity changes. On the contrary, the porosity of the matrix hardly changes when the porosity feedback effect is not considered, while its average increases to 0.13 if the water inflow occurs through the discontinuity. Moreover, the dissolution of small amounts of highly soluble sulfate minerals plays a major role in the development of additional fractures. The increase in hydraulic conductivity is largest for the power law with an exponent of n = 5, as well as the Kozeny-Carman and the modified Fair-atch k-ϕ relationships. The gypsum dissolution front propagates into the matrix faster when the power law with n = 2 and 3 and the Verma–Pruess k-ϕ relationships are used.

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Section: Introductionmentioning

confidence: 99%

Reactive Transport Model of Gypsum Karstification in Physically and Chemically Heterogeneous Fractured Media

et al. 2022

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“…The unique geological characteristics of shale gas reservoirs make it difficult for the compression coefficient to meet the conditions of laboratory measurements. Julio et al [15] noticed the geomechanical effects of the fracture rock masses incorporated in the model for fluid flow in deformable fractured media and represented the evolution of the fracture rock mass permeability. Sanaee et al [16] analysed the core flood laboratory experimental data using two different numerical methods, and both methods involved the overburden stress effects on the fracture-matrix core permeability.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Multistage Fractured Horizontal Wells considering Multiphase Flow and Geomechanical Effects

Liu

2021

Geofluids

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Hydraulic fracturing is a key technology in unconventional reservoir production, yet many simulators only consider the single-phase flow of shale gas, ignoring the two-phase flow process caused by the retained fracturing fluid in the early stage of production. In this study, a three-dimensional fluid–gas–solid coupling reservoir model is proposed, and the governing equations which involve the early injection water phenomenon and stress-sensitive characteristics of shale gas reservoirs are established. The finite element–finite difference method was used for discretisation of stress and strain equations and the equations of flow balances. Further, a sensitivity analysis was conducted to analyse fracture deformation changes in the production. Fracture characteristics under different rock mechanics coefficients were simulated, and the influence of rock mechanics parameters on productivity was further characterised. The stimulated reservoir volume zone permeability could determine the retrofitting effect, the permeability increased from 0.02 to 0.1 mD, and cumulative gas production increased from 18.08 to 26.42 million m3, thus showing an increase of 8.34 million m3, or 46%. The effect of Young’s modulus on the yield was smaller than Poisson’s ratio and the width and length of the fractures. Production was most sensitive to the length of the fractures. The length of the fracture increased from 200 to 400 m, and the cumulative gas production increased from 26.44 to 38.34 million m3, showing an increase of 11.9 million m3, or 45%. This study deepens the understanding of the production process of shale gas reservoirs and has significance for the fluid–gas–solid coupling of shale gas reservoirs.

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“…Many rocks of oil and gas reservoir, characterized with both pores and fractures, are dual-porosity and typical low-permeability medium (Cordero et al., 2019; Wang, 2018; Wang et al., 2018). Due to the pore pressure inside the rock, the mechanical properties are very complicated.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation on the effect of pore pressure gradient on the rules of hydraulic fracture propagation

2021

Energy Exploration & Exploitation

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To clarify the influence of pore pressure gradient on hydraulic fracture propagation, the stress distribution in and around the borehole is explained by theoretical analysis method in this paper. A mechanical model of hydraulic fracture initiation under the action of pore pressure gradient is established. Then coupled seepage-stress-damage software is used to simulate the initiation and propagation of hydraulic fractures in rock samples under the action of pore pressure gradient. Finally, the influence of the number and spatial position of the induction holes on the initiation and propagation of hydraulic fractures is analyzed. It is shown that: (1) Pore pressure gradient can effectively reduce the initiation pressure of hydraulic fractures. (2) The greater the pore pressure gradient is, the easier the hydraulic fracture is to spread to the region with high pore pressure. (3) With the action of pore pressure gradient, the hydraulic fracture is shaped as ‘丨’, ‘丿’ and ‘S’ types and can be represented by the four abstract conceptual models.

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Integrated discrete fracture and dual porosity - Dual permeability models for fluid flow in deformable fractured media

Cited by 36 publications

References 25 publications

Reactive Transport Model of Gypsum Karstification in Physically and Chemically Heterogeneous Fractured Media

Reactive Transport Model of Gypsum Karstification in Physically and Chemically Heterogeneous Fractured Media

Numerical Investigation of Multistage Fractured Horizontal Wells considering Multiphase Flow and Geomechanical Effects

Numerical simulation on the effect of pore pressure gradient on the rules of hydraulic fracture propagation

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