On the stochastic simulation procedure of estimating critical hydraulic gradient for gas storage in unlined rock caverns

Kim, Ji-Tae; Cho, Woncheol; Chung, Il-Moon; Heo, Jun Haeng

doi:10.1007/bf02913938

Cited by 27 publications

(5 citation statements)

References 20 publications

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“…Fracture surface roughness can alter the distributions of void spaces of fractures, especially during shear [101,[118][119][120][121]. Besides, the rougher fracture surface contributes to the longer flow paths that a particle moves within fractures, resulting in a weaker conductivity/permeability if the same pressure difference is applied on the opposing boundaries [36,77,122,123].…”

Section: Effect Of Fracture Surface Roughnessmentioning

confidence: 99%

A Review of Critical Conditions for the Onset of Nonlinear Fluid Flow in Rock Fractures

Jiang

2017

Geofluids

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Selecting appropriate governing equations for fluid flow in fractured rock masses is of special importance for estimating the permeability of rock fracture networks. When the flow velocity is small, the flow is in the linear regime and obeys the cubic law, whereas when the flow velocity is large, the flow is in the nonlinear regime and should be simulated by solving the complex NavierStokes equations. The critical conditions such as critical Reynolds number and critical hydraulic gradient are commonly defined in the previous works to quantify the onset of nonlinear fluid flow. This study reviews the simplifications of governing equations from the Navier-Stokes equations, Stokes equation, and Reynold equation to the cubic law and reviews the evolutions of critical Reynolds number and critical hydraulic gradient for fluid flow in rock fractures and fracture networks, considering the influences of shear displacement, normal stress and/or confining pressure, fracture surface roughness, aperture, and number of intersections. This review provides a reference for the engineers and hydrogeologists especially the beginners to thoroughly understand the nonlinear flow regimes/mechanisms within complex fractured rock masses.

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Section: Effect Of Fracture Surface Roughnessmentioning

confidence: 99%

A Review of Critical Conditions for the Onset of Nonlinear Fluid Flow in Rock Fractures

Jiang

2017

Geofluids

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“…At present, there are three types of methods used for this assessment: empirical or theoretical methods (Aberg, 1977;Goodall et al, 1998;SINOPEC, 2008), numerical methods (Kim et al, 2007;Sun and Zhao, 2010;Yu et al, 2013;Li et al, 2014;Wang et al, 2015aWang et al, , 2015b and experimental methods (Rehbinder et al, 1988;Lindblom, 1989;Cesano et al, 2000;Li et al, 2009;Perello et al, 2014;Wang et al, 2015c). Aberg (1977) conjectured that if the vertical hydraulic gradient around a storage cavern is greater than unity, then the stored petroleum gas will not leak through the surrounding host rock mass.…”

Section: Introductionmentioning

confidence: 97%

“…Kim et al (2007) studied the effects of spatial variability in hydraulic conductivity on the critical hydraulic gradient for effective gas containment in underground caverns. Sun and Zhao (2010) evaluated the effects of anisotropic permeability on water pressure, water quantities and critical gas pressure around storage caverns.…”

Section: Introductionmentioning

confidence: 99%

Assessing containment properties of underground oil storage caverns: methods and a case study

Qiao

Wang

et al. 2017

Geosci J

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One of the most important issues in the construction of underground water-sealed oil storage caverns is the assessment of their containment properties. These properties depend on the hydrogeological condition and also engineering characteristics of the caverns. Conceptual hydrogeological model for assessing the containment properties of underground water-sealed oil storage caverns was developed. Empirical, numerical and experimental methods for assessing the containment properties were summarized. A principle for the selection of assessment methods was proposed for engineering application. It was proposed that the selected assessment method should be appropriate for the investigation stages, the research objectives and the parameters which have been determined. A five-stage flowchart for the assessment of containment properties of underground water-sealed oil storage caverns was developed. The set of assessment methods was applied to a pilot underground water-sealed oil storage facility in China. Empirical methods, fracture network method and field test methods were presented for the assessment of the containment properties of the cavern, while the other methods were introduced in previous studies.

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“…ordered according to one or more reference directions) random variables [10] . At present, the random field theory has been widely used in geotechnical engineering, such as slopes [11] , tunnels [12] , and underground storage gas caverns [13][14][15] . Because the quantity of available measurements is usually not large enough, especially in the horizontal direction, the input data used to characterise the material properties in these studies was hypothetical.…”

Section: Introductionmentioning

confidence: 99%

Probabilistic analysis of water-sealed performance in underground oil storage considering spatial variability of hydraulic conductivity

Zhang

et al. 2022

Preprint

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For underground water-sealed oil storage, the spatial variability of the surrounding rock has a significant impact on the water-sealed effect of a water curtain system. This study presents a methodology for the probabilistic analysis of water curtain performance in underground oil storage, considering the spatial variability of hydraulic conductivity of the surrounding rock based on field data. Anisotropic random fields representing the spatial variability of hydraulic conductivity were established through spatial statistical analysis of field data and introduced into the finite element model of underground oil storage for water-sealed reliability analysis. The water-sealed performance of different water curtain system schemes was studied using Monte Carlo simulation (MCS). The results showed that the difference between the horizontal spatial correlation and the vertical spatial correlation of the surrounding rock has a significant impact on the water-sealed effect of the water curtain system. An excessively large pressure of water curtain boreholes provided a small contribution to improving water curtain performance. The distance between the water curtain holes and the caverns has the less significant affecting the water-sealed reliability of the storage cavern. Finally, the optimal design of the water curtain system is discussed. This study provides valuable insights and a theoretical basis for the optimisation of water curtain system design parameters for underground water-sealed oil storage.

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On the stochastic simulation procedure of estimating critical hydraulic gradient for gas storage in unlined rock caverns

Cited by 27 publications

References 20 publications

A Review of Critical Conditions for the Onset of Nonlinear Fluid Flow in Rock Fractures

A Review of Critical Conditions for the Onset of Nonlinear Fluid Flow in Rock Fractures

Assessing containment properties of underground oil storage caverns: methods and a case study

Probabilistic analysis of water-sealed performance in underground oil storage considering spatial variability of hydraulic conductivity

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