Coupled fluid flow and geomechanics modeling of stress-sensitive production behavior in fractured shale gas reservoirs

Jiang, Jiamin; Yang, Jie

doi:10.1016/j.ijrmms.2017.11.003

Cited by 66 publications

(31 citation statements)

References 46 publications

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“…Therefore, process of methane filtration into the hole´s cavity and roadway room is unsteady, and boundary conditions are mobile. Thus, a model should take into account the combined processes of ground movement, deformation, and damage as well as nonstationary filtration of methane under mobile boundary conditions (Jiang and Yang, 2018). It is evident that gas filtration process depends both on rate at the area of this panel, and the seam was prone to gas and coal bursts.…”

Section: Methodology Of Simulationmentioning

confidence: 99%

A method for measuring coalbd methane content in coal strata without the loss of the gas

Nazimko¹

2018

Acta Geodynamica Et Geomaterialia

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This paper describes an invented method for direct measurement of coalbed methane content in situ. In contrast to known procedures, this method does not need to place a rock or drilling cuts into an airtight canister, and does not involve sealing of the hole. Moreover, the new method is monitoring methane content in situ continuously and synchronously during drilling the hole not losing any portion of the gas. These positive features are a sequel of new approach based on injection of known portion of neutral gas into the hole. Methane content was determined from concentration of the mixture 'methane-neutral gas´ at the hole´s mouth. New method is applicable for commercial recovery application of coalbed methane and forecast of dangerous gas and coal bursts. FLAC3D computer simulation helped to investigate dynamics of methane outflow from the hole to account for the effect of drilling speed on the rate of gas emanation. ARTICLE INFOCite this article as: Nazimko V: A method for measuring coalbed methane content in coal strata without the loss of the gas.

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Section: Methodology Of Simulationmentioning

confidence: 99%

A method for measuring coalbd methane content in coal strata without the loss of the gas

Nazimko¹

2018

Acta Geodynamica Et Geomaterialia

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“…When a reservoir exploits, the formation pressure decreases, and the effective stress acting on proppants increases, which results in proppant compression deformation and falling into the formation on the fracture surface (Figure 4). The decrease of the fracture width will lead to the decrease of flow capacity of hydraulic fractures [35][36][37][38][39]. According to results of physical simulation, the relationship between conductivity and effective stress can be expressed as [40]…”

Section: Construction Of Flow Model In Hydraulic Fracturesmentioning

confidence: 99%

Pressure Response of a Horizontal Well in Tight Oil Reservoirs with Stimulated Reservoir Volume

Chen¹,

Pingguo³

et al. 2021

Lithosphere

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Stimulated reservoir volume is an effective stimulation measure and creates a complex fracture network, but the description and characterization of fracture network are very difficult. Well test analysis is a common method to describe the fracture network, and it is the key to build a proper interpretation model. However, most published works only consider the shape of the fractured area or the stress sensitivity effect, and few works take both factors into account. In this paper, based on reservoir properties and flow law after a stimulated reservoir volume, an interpretation model is established with an arbitrary shape of the fractured area and stress sensitivity effect of different flow areas. The model is solved to conduct the pressure response using Laplace transform, point source function, and boundary element theory. The influence of fractures’ parameters and stress sensitivity effect is analyzed on the pressure behavior. Results from this study show that the special flow regimes for a horizontal well with a stimulated reservoir volume are (1) bilinear flow dominated by hydraulic fractures, (2) linear flow dominated by formation around the hydraulic fractures, (3) crossflow from a matrix system to the fractured area, and (4) radial flow control by properties of the fractured area. Parameters of hydraulic fractures mainly affect the early stage of pressure behavior. On the contrary, the stress-sensitive effect mainly affects the middle and late stages; the stronger the stress sensitivity effect is, the more obvious the effect is. The findings of this study can help for better understanding of the fracture network in a tight oil reservoir with a stimulated reservoir volume.

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“…A splitting-node technique is used to duplicate the nodes along the fractures: each node has its own degrees of freedom, but it shares the same coordinates as the other split nodes (Ji et al 2009;Garipov et al 2016). The linear or nonlinear interactions of fracture surfaces and fracture-proppant can be easily implemented using this technique (Jiang and Yang 2018). These split nodes form the so-called 'zero-thickness interface element' that is widely applied in fracture mechanics, such as the cohesive zone model.…”

Section: Discretization and Solution Schemementioning

confidence: 99%

Sequentially coupled flow and geomechanical simulation with a discrete fracture model for analyzing fracturing fluid recovery and distribution in fractured ultra-low permeability gas reservoirs

Liu

Leung

et al. 2020

Journal of Petroleum Science and Engineering

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More accurate characterization and prediction of the in-situ distribution of fracturing fluid in fractured reservoirs are needed for enhancing well productivity. In this study, an implicitsequentially coupled flow/geomechanics simulator incorporating an efficient discrete fracture model is developed to model fluid distribution and recovery performance of ultra-low permeability gas reservoirs. The finite-volume and finite-element methods are used for space discretization of the flow and geomechanics equations, respectively, while the backward Euler method is employed for time discretization. The flow and geomechanics equations are solved sequentially based on fixed-stress splitting. An efficient discrete-fracture model is used to explicitly model the fractured system. Flexible unstructured gridding is employed to model arbitrarily-oriented fractures. The interrelations among pore volume, permeability and geomechanical conditions are considered dynamically using two-way coupled flow and geomechanics computations. The geometry of fracture (networks) due to hydraulic fracturing has significant impacts on the fracturing fluid recovery efficiency and ensuing fluid distribution. Under the same injection volume, the fracturing fluid recovery is higher when the fracture geometry is planar. Fluid recovery is relatively lower whenever natural fractures are activated during fracturing treatments; flowback time is also shortened when complex fracture network with enlarged fracture interface is present. Fracturing fluid in hydraulic fractures may leak off into the natural fractures and subsequently imbibes into the surrounding matrix due to capillarity effects. The fracturing fluid recovery and in-situ fluid distribution are sensitive to the shut-in duration and fracture closure behavior. This study analyzes the coupled flow-geomechanical responses of fractured gas reservoirs during the post-fracturing periods. Understanding the fate of the fracturing fluid can provide insights on, to some extent, the stimulated fracture volume, size of the water invasion zone, and efficiency of the fracturing design. The simulation predictions can also provide more accurate initial reservoir conditions (e.g. distributions of different phases and pressure) for long-term well performance estimation.

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Coupled fluid flow and geomechanics modeling of stress-sensitive production behavior in fractured shale gas reservoirs

Cited by 66 publications

References 46 publications

A method for measuring coalbd methane content in coal strata without the loss of the gas

A method for measuring coalbd methane content in coal strata without the loss of the gas

Pressure Response of a Horizontal Well in Tight Oil Reservoirs with Stimulated Reservoir Volume

Sequentially coupled flow and geomechanical simulation with a discrete fracture model for analyzing fracturing fluid recovery and distribution in fractured ultra-low permeability gas reservoirs

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