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Littérature scientifique sur le sujet « Fracture parameter »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Fracture parameter"

Sil, Samik. « Fracture parameter estimation from well-log data ». GEOPHYSICS 78, n^o 3 (1 mai 2013) : D129—D134. http://dx.doi.org/10.1190/geo2012-0407.1.

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We evaluated a method of deriving seismic fracture parameters from vertical-well-log data with the assumption that the fractured medium is transversely isotropic with a horizontal axis of symmetry (HTI). One approximation we used is that the observed vertical P-wave velocity is the same as the background isotropic P-wave velocity of the HTI medium. Another assumption was that the fractures and cracks are noninteractive and penny shaped. Using these approximations, we generated the fracture compliance matrix for each layer. Fracture parameters were then derived by constructing the HTI stiffness matrix for those layers. We tested our method using vertical-well-log data from a tight sand reservoir in Colorado, USA. “Thomsen-style” parameters were derived, and gas-filled fractures were identified on this log. The identified gas-filled fractures were compared to the production log data. The fracture density was also obtained at the well location within the depth of interest. We also found some problems and limitations caused by approximating vertical P-wave velocity the same as the background isotropic P-wave velocity.

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Yu, Qingyan, Qi Wang, Pengcheng Liu, Jing Zhang, Qi Zhang, Xiaojuan Deng et Kai Feng. « Theoretical Study and Application of Rate Transient Analysis on Complex Fractured-Caved Carbonate Reservoirs ». Geofluids 2021 (23 janvier 2021) : 1–15. http://dx.doi.org/10.1155/2021/6611957.

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Carbonate reservoirs are mainly fractured-caved reservoirs with very well-developed dissolved pores, fractures, and caves. They have strong heterogeneity with various types of reservoir pore spaces. Using seismic inversion and reservoir static characterization, the result shows that the fractured-caved carbonate rocks in China are mainly caves with poor connectivity and complex oil-water distribution. Large-scale dissolved caves are mostly discrete and isolated, while the fractures are complex and various. The fracture features are observed either as a single large fractures or as a local fracture network. The characteristics of fluid flow in fracture-caved reservoirs vary as a result of the different combinations of fractures and caves. Currently, the static characterization technology of fractured-caved reservoirs is influenced by the limited resolution of seismic data, leading to large interpretation errors. In contrast, the dynamic method is a more reliable and effective method to determine reservoir parameters. However, traditional seepage equations cannot accurately characterize the flow pattern of fractured-caved carbonate reservoirs. In the case of a single large-scale dissolved fractured-caved reservoir, oil wells are usually connected to large caves through large fractures or directly drilled into large dissolved caves. In this study, the large-scale dissolved caved reservoir is simplified into two cases: (1) a single-cave and single-fracture series model composed of a single-cave and a single-fracture and (2) a composite model of dissolved caves and surrounding fracture networks. Note that the flow in a large cave is considered as free flow due to its large scale. The flow in a large fracture connected to the cave is considered as flow through porous media, and the flow in the reservoir surrounding the fracture network is considered as multiple-porosity model seepage flow. The corresponding seepage-free flow coupling mathematical model of different fractured-caved reservoirs has been established on this basis. We also obtained the rate transient analysis type curves of the oil well, conducted sensitivity analysis of each parameter, constructed the corresponding rate transient analysis curves, analyzed sensitivities of each parameter, and finally designed a dynamic evaluation method of well and reservoir parameters for different types of fractured-caved carbonate reservoirs. This study extensively applies this method in the Halahatang Oilfield of China and evaluates parameters such as reservoir reserves and physical properties to provide rational guidance for developing fractured-caved carbonate reservoirs.

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Zhang, Tingting, Ruifeng Zhang, Jianzhang Tian, Lifei Lu, Fengqi Qin, Xianzeng Zhao et Yuefeng Sun. « Two-parameter prestack seismic inversion of porosity and pore-structure parameter of fractured carbonate reservoirs : Part 2 — Applications ». Interpretation 6, n^o 4 (1 novembre 2018) : SM9—SM17. http://dx.doi.org/10.1190/int-2018-0019.1.

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Fractures and fracture-related dissolution pores, as well as cavities, molds, and vugs, provide the major conduit and/or storage space for hydrocarbons in the deeply buried carbonate hill of Hexiwu field, Bohai Bay Basin. The fractured reservoir generally has lower porosity but better permeability than moldic/vuggy reservoir, and it consists of the major part of the buried-hill slope and buried-hill internal reservoirs. The conventional method of characterizing carbonate reservoirs, however, often mixes these two types of reservoirs together because they both have low acoustic impedance and low bulk modulus. The rock-physics analysis of two field wells indicates that a pore-structure parameter defined in a rock-physics model, the so-called Sun model, can help to distinguish the fractured reservoir zones together with porosity. Fractured zones usually have porosity of less than 5% and a pore-structure parameter of greater than six, whereas moldic/vuggy reservoirs of higher porosity have a pore-structure parameter of less than six. Field-scale application demonstrates that simultaneous prestack seismic inversion for the porosity and pore-structure parameter enables 3D mapping of fractured reservoir zones in the buried carbonate hills. It also provides an analog of detecting fractures and/or fracture-related pores in deeply buried carbonates in similar geologic settings.

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Zhou, Xin, Jianping Chen, Yunkai Ruan, Wen Zhang, Shengyuan Song et Jiewei Zhan. « Demarcation of Structural Domains in Fractured Rock Masses Using a Three-Parameter Simultaneous Analysis Method ». Advances in Civil Engineering 2018 (6 décembre 2018) : 1–13. http://dx.doi.org/10.1155/2018/9358098.

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A structural domain represents a volume of a rock mass with similar mechanical and hydrological properties. To demarcate structural domains (or statistically homogeneous regions) in fractured rock masses, this study proposes a three-parameter simultaneous analysis method (3PSAM) that simultaneously considers rock fracture orientation, trace length, and aperture to evaluate statistical homogeneity between two regions. First, a 102-patch three-dimensional Schmidt net, which represents a new comprehensive classification system, is established to characterize rock fractures based on their orientation and aperture. Two populations of rock fractures can then be projected to the corresponding patches. Second, the Wald–Wolfowitz runs test is used to measure the similarity between the two populations by considering the fracture trace lengths. The results obtained by applying the 3PSAM to seven simulated fracture populations show that the homogeneity is influenced by both the distributions of the fracture parameters and the sequences of the fracture parameters. The influence of a specific combination sequence makes it impractical to analyze the rock fracture parameters individually. Combined with previous methods, the 3PSAM provides reasonable and accurate results when it is applied to a fractured rock slope engineering case study in Dalian, China. The results show that each fracture population should be identified as an independent structural domain when using the 3PSAM. Only the 3PSAM identifies the west exploratory trench 2 and the east exploratory trench as being nonhomogeneous because the difference in the aperture of the two fracture populations is considered. The benefit of the 3PSAM is that it simultaneously considers three parameters in the demarcation of structural domains.

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Wang, Kang, Suping Peng, Yongxu Lu et Xiaoqin Cui. « Full waveform inversion in fractured media based on velocity–stress wave equations in the time domain ». Geophysical Journal International 227, n^o 2 (29 juillet 2021) : 1060–75. http://dx.doi.org/10.1093/gji/ggab243.

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SUMMARY In the process of seismic wave propagation, the presence of fractures will cause a seismic wave response associated with fracture compliance. Full waveform inversion (FWI) is an effective way to quantitatively obtain fracture compliance values, which can simulate seismic wave propagation in a fractured medium and compute the gradient expression of the fracture compliance parameters. To obtain the fracture compliance parameters quantitatively, a new technique based on FWI needs to be proposed. Based on linear slip theory, a new finite-difference scheme using a rotated grid has been developed to simulate the propagation of seismic waves in fractured media. The corresponding adjoint equation for FWI and the gradient of fracture parameter expression are presented. The crosstalk between normal compliance and tangential compliance is analysed in a homogeneous background medium. Numerical simulations in double-layer media show that the new gradient equation is effective.

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Yan, Tianfan, et Yike Liu. « Fracture detection using scattered waves in the angle domain ». GEOPHYSICS 86, n^o 4 (15 juin 2021) : S257—S269. http://dx.doi.org/10.1190/geo2020-0128.1.

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The singly and multiply scattered waves generated from interfaces of a fractured medium have strong energy, and their propagation directions contain information of fracture parameters. To exploit the useful information in the scattered waves, a fracture scattering imaging method is developed based on reverse time migration and angle decomposition. In this method, a fracture-parameter-related local image matrix is constructed in the angle domain based on the relation between the fracture parameters and the propagation angle of the scattered waves. The distribution of the scattered waves in the proposed image matrix can be used to invert for fracture parameters and identify the energy of scattered waves. Images of the fractures can be obtained by summing up the energy of the scattered waves from the proposed image matrix. Synthetic and field examples are provided to determine that the new method is effective in migrating the fracture-scattered waves at the correct spatial position and accurately extracting fracture parameters.

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Partsinevelou, Aikaterini-Sofia. « Using the SWAT model in analyzing hard rock hydrogeological environments. Application in Naxos Island, Greece. » Bulletin of the Geological Society of Greece 51 (4 octobre 2017) : 18. http://dx.doi.org/10.12681/bgsg.11960.

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The main parameter that controls the groundwater flow regime in fractured aquifers is the fracture pattern. Its description is crucial for a hydrogeological study, as the hydraulic properties of hard rocks are mainly controlled by fracturing. The parameters of the fracture pattern that were analyzed in the study area were the frequency and spatial location of the fractures, the density of fractures and the degree of fracture intersection.Furthermore, a straight link between the fracture pattern and the hydrological conditions is important for a first analysis of the potential groundwater zones and their vulnerability in hard rock environments. To study this link, the SWAT hydrology model was applied in the study area. Using suitable territorial and meteorological data, the model simulates the parameters of the hydrological balance in each catchment of the hydrographical network.The analysis of the fracture pattern revealed that the fragmentation in all lithologies is characterized by high degree of uniformity. Very high density and interconnection density of the fractures are observed in areas where the alternations between different lithologies are very intense. Also the application of the SWAT model showed that the calculated hydrological parameters could be related to the fracture pattern, as high infiltration rates occur in areas where the density and the degree of interconnection of the fractures are also high.

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Jiang, Le, Peng Gao, Jie Liu, Yunbin Xiong, Jing Jiang, Ruizhong Jia, Zhongchao Li et Pengcheng Liu. « Simulation and Optimization of Dynamic Fracture Parameters for an Inverted Square Nine-Spot Well Pattern in Tight Fractured Oil Reservoirs ». Geofluids 2020 (22 septembre 2020) : 1–9. http://dx.doi.org/10.1155/2020/8883803.

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Dynamic fractures are a geological attribute of water flooding development in tight fractured oil reservoirs. However, previous studies have mainly focused on the opening mechanism of dynamic fractures and the influence of dynamic fractures on development. Few attempts have been made to investigate the optimization of the dynamic fracture parameter. In this study, the inverted square nine-spot well pattern model is established by taking fractured reservoir’s heterogeneity and its threshold pressure gradients into account. This simulation model optimizes the various parameters in a tight fractured oil reservoir with dynamic fractures, that is, the intersection angle between the dynamic fractures and the well array, the number of dynamic fractures, the penetration ratio, and the conductivity of the oil well’s hydraulic fractures. The results of this optimization are used to investigate the oil displacement mechanism of dynamic fractures and to discuss a mechanism to enhance oil recovery using an inverted square nine-spot well pattern. The simulation results indicate that a 45° intersection angle can effectively restrain the increase in the water cut. A single dynamic fracture can effectively control the displacement direction of the injected water and improve the oil displacement efficiency. Moreover, the optimal penetration ratio and the conductivity of the hydraulic fracture are 0.6 and 40 D-cm, respectively.

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ZHANG, LIMING, CHENYU CUI, XIAOPENG MA, ZHIXUE SUN, FAN LIU et KAI ZHANG. « A FRACTAL DISCRETE FRACTURE NETWORK MODEL FOR HISTORY MATCHING OF NATURALLY FRACTURED RESERVOIRS ». Fractals 27, n^o 01 (février 2019) : 1940008. http://dx.doi.org/10.1142/s0218348x19400085.

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The distribution of fractures is highly uncertain in naturally fractured reservoirs (NFRs) and may be predicted by using the assisted-history-matching (AHM) that calibrates the reservoir model according to some high-quality static data combined with dynamic production data. A general AHM approach for NFRs is to construct a discrete fracture network (DFN) model and estimate model parameters given the observations. However, the large number of fractures prediction required in the AHM process could pose a high-dimensional optimization problem. This difficulty is particularly challenging when the fractures form a complex multi-scale fracture network. We present in this paper an integrated AHM approach of NFRs to tackle these challenges. Two essential ingredients of the method are (1) a 2D fractal-DFN model constructed as the geological simulation model to describe the complex fracture network, and (2) a mixture of multi-scale parameters, built according to the fractal-DNF model, as an inversion parameter model to alleviate the high-dimensional optimization burden caused by complex fracture networks. A reservoir with a multi-scale fracture network is set up to test the performance of the proposed method. Numerical results demonstrate that by use of the proposed method, the fractures well recognized by assimilating production data.

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Geng, Yudi, et Jun Zhou. « Parameter optimization of acid fracturing in ultra-deep fault zone carbonate reservoir ». E3S Web of Conferences 338 (2022) : 01021. http://dx.doi.org/10.1051/e3sconf/202233801021.

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The characteristics of fracture development are complex in Shunbei area. The natural fracture development is different between different fault zones and in different locations of the same fault zone. Not all natural fractures can be activated during acid fracturing, and not all natural fractures can contribute to well productivity after acid fracturing. The use of natural fractures can not only improve the seepage capacity of the reservoir, but also improve the well productivity. Therefore, the influence of artificial fracture on the opening and fracture conductivity maintenance of natural fracture is studied, and finally the acid fracturing roceand parameters based on the change of natural fracture are formed.

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Thèses sur le sujet "Fracture parameter"

MacLennan, Iain James. « Two parameter engineering fracture mechanics ». Thesis, University of Glasgow, 1996. http://theses.gla.ac.uk/6756/.

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The object of this work was to investigate and expand on previously carried out research into elastic-plastic crack tip fields using the first two terms of the Williams expansion to characterise the degree of crack tip constraint. As a precursor to this research a history of fracture mechanics is also presented. In the present work crack tip fields in small scale yielding have been detennined using modified boundary layer formulations in an attempt to model the influence of the second order term of the Williams expansion, the T -stress. The prime object of this thesis was to investigate and expand on previously carried out research into a two parameter characterisation of elastic-plastic crack tip fields using the second parameter of the Williams expansion(T), which attempts to characterise the degree of crack tip constraint. Modified Boundary Layer formulations in conditions of plane strain were implemented to derive a suitable reference solutions, against which the effects of out of plane strains can be compared and the validity of presently established reference fields can be gauged. The effect of out of plane non-singular stress, S, on the crack tip stress field were also considered, where constraint was largely determined by T. A wide range of analyses have been carried out, from the microstructural scale to complete engineering components in an attempt to characterise crack tip stress fields. The ability to apply two parameter fracture concepts to real engineering structures requires methods for calculating T for complex components with realistic semi-elliptical defects. A simple engineering method for achieving this was developed making use of linespring elements in the finite element package ABAQUS. This approach was validated by the calculation of T for semi-elliptical cracks at the chord-brace intersection of a tubular welded joint, modelled using the mesh generation program PATRAN. The micromechanics of cleavage, using the Ritchie-Knott-Rice model have also been constructed. This work relates the ratio of J for unconstrained and constrained geometries to critical microstructural distance, critical cleavage stress and the toughness ratio on the strainhardening effect. The elastic-plastic behaviour of short and deeply cracked bend bars has previously been described by Betegon and Hancock based on the first two terms of the Williams expansion. A local cleavage criterion has been applied to these fields to indicate the effect of loss of constraint on lower shelf toughness of shallow cracked bend bars. The work models the maximum temperature at which cleavage can occur in these geometries to show the effect of constraint and aJW ratio of cracked bend bars on the ductile-brittle transition temperature. This has also been backed by a significant experimental research program. Finally constraint dependent toughness has been considered in relation to failure assessment methodologies. A simple engineering method for modifying these Failure Assesssment Diagrams has been presented, this consists of considering the constraint matched toughness of the strucutre. This procedure recovers the original Failure Assessment Line and unifies the constraint dependent fracture toughness within defect assessment schemes which utilise Failure Assessment Diagrams.

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Yoon, Kee Bong. « Characterization of creep fatigue crack growth behavior using C[superscript](t[superscript]) parameter ». Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/17523.

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Curtin, William J. « An investigation of a two parameter elastic-plastic fracture mechanics methodology ». Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/17782.

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Reakes, Clayton E. IV. « Nonlinear Fracture Mechanics Analysis of Threaded Fastener Geometry ». University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1447425945.

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Wert, Melissa Jane. « The applicability of modified J-integral as a fracture parameter for polycarbonate ». Thesis, Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/18860.

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MARTINELLI, MATTIA. « From outcrop to fracture model. A multidisciplinary approach to characterize fracture networks from outcrop analogues in carbonates affected by extensional tectonics ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2020. http://hdl.handle.net/10281/271026.

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I network di fratture hanno un ruolo fondamentale nel controllo della permeabilità e del flusso dei geo-fluidi (e.g. idrocarburi, acqua, fluidi idrotermali ecc.). Nel sottosuolo i parametri delle fratture vengono solitamente caratterizzati utilizzando dati di pozzo e dati sismici, i quali però sono divisi da un salto di scala. Infatti, i dati di pozzo sono sparsi e parziali mentre anche la sismica migliore non è in grado di identificare fratture con dimensione minori di 200 metri. Gli analoghi esumati con dimensioni chilometriche posso aiutare a colmare questo divario permettendo di raccogliere una grande quantità di dati a scale differenti. In questa tesi di dottorato abbiamo caratterizzato il network di fratture nei carbonati delle isole di Malta e Gozo, che si trovano all’interno della Piattaforma Pelagica nel foreland della catena Appeninico-Magrebide e sono degli spettacolari analoghi esumati di reservoir di idrocarburi fratturati sviluppatisi in ambienti tettonici estensionali. La stratigrafia delle isole maltesi è caratterizzata dalla presenza di differenti tipi di carbonati di età compresa tra il tardo Oligocene e il Miocene superiore., tagliati da due set di faglie normali (ENE-WSW e WNW-ESE) con rigetti verticali che possono raggiungere i 210 metri. Dicchi nettuniani associati a faglie normali con rigetto limitato (meno di 5 metri) sono inoltre presenti nelle unità più antiche. In questa tesi abbiamo utilizzato un approccio multidisciplinare che ci ha permesso di effettuare diversi tipi di studi che sono presentati nei quattro capitoli della tesi. i) Nel primo capitolo abbiamo ricostruito l’evoluzione tettonica e geodinamica delle isole di Malta e Gozo e della Piattaforma Pelagica a partire dal tardo Oligocene fino al Pliocene. Questo ci ha permesso inoltre di ricostruire l’età di formazione e la cinematica dei diversi set di faglie e fratture. ii) Nel secondo capitolo abbiamo caratterizzato i parametri delle fratture assieme al loro impatto sulla connettività idraulica e l’architettura della zona di danneggiamento legata alla faglia di Qala (Gozo). Per fare questo abbiamo applicato un nuovo workflow che combina scan-line lineari con scan-area applicate su modelli di affioramento digitali di dimensioni chilometri utilizzando inoltre metodi automatici per il calcolo dei parametri della fratturazione. iii) Nel terzo capitolo, abbiamo mostrato come la meccanica stratigrafica e in particolare le proprietà elastiche delle rocce giochino un ruolo fondamentale nel controllo dello spessore della damage zone. I risultati sono stati ottenuti combinando osservazioni di terreno con analisi petro-fisiche, petrografiche, geo-meccaniche e modelli numerici. iv) Nel quarto capitolo abbiamo utilizzato il Volume Elementare Rappresentativo del network di fratture caratterizzato durante lo studio effettuato nel capitolo due per realizzare modelli DFN ad una scala più piccola rispetto a quella del reservoir. Questo ci ha permesso di risolvere diversi problemi legati alla modellazione della fratturazione alla scala del reservoir.
Fracture networks exert a primary role in the control of permeability and flow of geo-fluids (e.g hydrocarbons, ground water, hydrothermals fluid, etc.). Fracture parameters in the subsurface are usually characterised using borehole and seismic data, but these are affected by a scale gap. Well data are only sparse and partial and even the best seismic data cannot detect fractures shorter than ca 200 m. Km-scale outcrop analogues can help to fill this gap, allowing to collect huge amounts of of data at different scales. This PhD thesis investigates the fracture networks in carbonates of the Maltese Islands, located in the Pelagian Platform in the foreland of the Sicilian-Appenine-Maghrebian fold and thrust belt, that are world-class analogues of extensional fractured and faulted hydrocarbon reservoirs. Here a Late-Oligocene – Late Miocene carbonatic sequence composed by different types of carbonates is exposed. It is cross-cut by normal faults with a vertical displacement up to 210 meters, arranged in two main sets striking ENE-WSW and WNW-ESE. Moreover, Neptunian dykes associated with small normal faults (less than 5 meters of displacement) are present in the lower units. We applied a multidisciplinary approach that allowed us to carry out the following studies that are presented in the four chapters of these thesis. i) In the first chapter, we characterize the tectonic and geodynamic evolution of the Maltese Islands and Pelagian Platform from the Late Oligocene to the Pliocene and to understand the timing, kinematics and stress regime of the different fault and joint sets. ii) In the second chapter, we Investigate the fracture parameters and their impact on hydraulic connectivity and the architecture of the damage of the Qala fault (Gozo). The study was performed applying a new workflow that combines linear scanlines and scanareas collected on a large Digital Outcrop Model also using automatic methods for the extraction of fracture parameters. iii) In the third chapter, we investigate the control of the mechanical stratigraphy and in particular of the elastic properties of the rocks on the damage zone thickness combining petrographical, petrophysical, geomechanical and numerical modeling analyses. iv) In the fourth chapter, we characterize the Representative Elementary Volume of fracture network parameters extracted from the DOM study to drive Discrete Fracture Network modeling. This allows building DFN models on in order to build DFN model on a smaller scale with respect to the reservoir scale solving many numerical models.

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Wang, Yongyi. « A two-parameter characterization of elastic-plastic crack tip fields and applications to cleavage fracture ». Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/13461.

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Hosseinian, Armin. « Numerical simulations of fluid flow through a single rough walled fracture ». Thesis, Curtin University, 2011. http://hdl.handle.net/20.500.11937/1764.

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The morphological properties of rock fractures may have a significant influence on their hydromechanical behaviour. Fracture surface roughness could change the fluid flow regime from laminar to turbulent, while it causes the flow properties to deviate from cubic law for smooth channels due to a change in fracture equivalent hydraulic aperture. Different empirical (including the well known Joint Roughness Coefficient, JRC) and statistical methods have been proposed for surface roughness characterisation in an attempt to link them to the hydromechanical behaviour of fractures.This thesis aims to investigate the potential for assessment of fluid behaviour by studying its surface geometrical properties. D[subscript]R[subscript]1 and D[subscript]R[subscript]2, the 2D and 3D roughness parameters developed recently using Riemannian geometry, were used to correlate fracture geometry to its flow behaviour. Also, the 2D Riemannian isotropy parameter (I[subscript]R[subscript]2) was used to correlate surface roughness anisotropy with directionality in fluid flow behaviour along different directions.Numerical simulations in both 2D and 3D were performed assuming the laminar flow regime using FLUENT software. This assumption is, to a large extent, acceptable for situations where the height to length ratios of a fracture is very small. 2D analysis of synthetic profiles with different geometries demonstrated how a change in profile roughness can affect flow response, for example, the pressure drop. JRC flow channels developed in this work as combinations of pairs of JRC profiles were simulated numerically. The analysis results indicated that channels with a similar JRC average for the upper and lower walls but a different JRC profile number responded differently when they were subjected to fluid flow. Therefore, assuming special fluid properties, correlations developed using the pressure drop of a fracture can be estimated by its analogy to JRC flow channels.3D simulations of a corrugated plane were performed assuming different asperity height distributions, for fluid travelling along different directions with respect to surface geometry and at different shear displacements. No asperity contact and failure is assumed in the analysis performed in this work. D[subscript]R[subscript]2 analysis results of the corrugated plane indicated how fluid flow could be related to surface geometry. For instance, it was observed that the pressure drop was maximised along the direction of maximum roughness and reduced to its minimum along a perpendicular direction which shows anisotropy in fluid flow behaviour. Significant changes in pressure drop due to shear offset indicated the importance of fracture wall displacements with respect to each other. A detailed analysis of one synthetically generated surface, and also five surfaces with identical statistical parameters except their correlation distances being different, further confirmed the above concepts. This was followed by analysing a real rock like fracture which was studied elsewhere for fracture shear tests in the lab. Simulation of this surface was performed with particular interest in identifying the locations where the velocity magnitude reduced to nearly zero after the fracture was subjected to a shear offset corresponding to maximum shear stress. These areas were found to be very similar to the locations of asperity degradations as observed through lab experiments. The roughness analysis of the surface was in agreement with the correlation found between the mechanical and hydraulic behaviour of the surface.The results of this research demonstrate how detailed analysis of surface geometry could provide valuable information with respect to surface flow behaviour. Detailed discussions and interpretations of the results will be presented and various conclusions will be made.

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WATANABE, Katsuhiko, et Hideyuki AZEGAMI. « Proposal of a New Crack Model Considering the Discontinuity in the Cracked Plane and Its Application to the Evaluation of Crack Parameter ». 日本機械学会, 1986. http://hdl.handle.net/2237/12161.

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渡辺, 勝彦, Katsuhiko Watanabe, 秀幸畔上 et Hideyuki Azegami. « き裂前縁を含む面の非連続性を考慮したき裂モデルの提案とそのき裂パラメータ評価への適用 ». 日本機械学会, 1985. http://hdl.handle.net/2237/7227.

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Livres sur le sujet "Fracture parameter"

F, Shih C., U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research. Division of Engineering., Brown University. Division of Engineering. et Naval Surface Warfare Center (U.S.). Carderock Division., dir. Two-parameter fracture mechanics : Theory and applications. Washington, DC : Division of Engineering, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1993.

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Andrew, Setzer, et George C. Marshall Space Flight Center., dir. Effects of water on the strength of Zerodur. [Marshall Space Flight Center, Ala.] : George C. Marshall Space Flight Center, 1991.

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Fracture processes of concrete : Assesment of material parameters for fracture models. Boca Raton : CRC Press, 1997.

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Shlyannikov, Valery N. Elastic-Plastic Mixed-Mode Fracture Criteria and Parameters. Berlin, Heidelberg : Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-45836-4.

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Makridin, N. I. Struktura i parametry treshchinostoĭkosti t︠s︡ementnykh kompozitov. Penza : Penzenskai︠a︡ gos. arkhitekturno-stroit. akademii︠a︡, 2000.

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Canada, Atomic Energy of. Generation of Synthetic Fracture Parameters For Crack Network Analysis. S.l : s.n, 1985.

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Karstensen, A. D. Effect of Weibull parameters on 'local approach' to cleavage fracture predictions. Cambridge : TWI, 1999.

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P, Gyekenyesi John, et United States. National Aeronautics and Space Administration., dir. Calculation of Weibull strength parameters and Batdorf flow-density constants for volume- and surface-flaw-induced fracture in ceramics. [Washington, DC] : National Aeronautics and Space Administration, 1989.

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V, Zaretsky Erwin, et United States. National Aeronautics and Space Administration., dir. Comparison of Weibull strength parameters from flexure and spin tests of brittle materials. [Washington, DC] : National Aeronautics and Space Administration, 1991.

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Chapitres de livres sur le sujet "Fracture parameter"

Vlček, L., Z. Chlup et V. Kozák. « Problems in Q-Parameter Calculations ». Dans Transferability of Fracture Mechanical Characteristics, 79–92. Dordrecht : Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0608-8_6.

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Hadj Meliani, M., O. Bouledroua, M. Ould-M’beirick, K. El-miloudi, Dj Neggaz, T. Nateche, A. El-azzizi, H. Bokort, F. Houari et Guy Pluvinage. « The Two-Parameter Approach for Fracture Mechanics : Some Industrial Applications ». Dans Fracture at all Scales, 105–34. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-32634-4_6.

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Wang, Xiang Dong, Wei Xuan Zhu, Ai Min Deng, Dong Zhou et Dao Yuan Xu. « Concrete Damage Parameter and its Size Effect ». Dans Advances in Fracture and Damage Mechanics VI, 369–72. Stafa : Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-448-0.369.

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Kotake, Shigeo, Hiroyuki Kimata, Takashi Aoki, Yasuyuki Suzuki et Masafumi Senoo. « Catastrophic Transformation of Electron Stress and Electron Stiffness Parameter on Metal and Semiconductor ». Dans Mesoscopic Dynamics of Fracture, 195–209. Berlin, Heidelberg : Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-662-35369-1_17.

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Li, Chun Guang, Xiu Run Ge, Hong Zheng et Shui Lin Wang. « Two-Parameter Parabolic Mohr Strength Criterion and Its Damage Regularity ». Dans Fracture and Strength of Solids VI, 327–32. Stafa : Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-989-x.327.

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Ben Amara, M., Guy Pluvinage, J. Capelle et Z. Azari. « The CTOA as a Parameter of Resistance to Crack Extension in Pipes Under Internal Pressure ». Dans Fracture at all Scales, 59–88. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-32634-4_4.

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Brokmann, Christopher. « Mechanical Parameter Quantification ». Dans A Model for the Stochastic Fracture Behavior of Glass and Its Application to the Head Impact on Automotive Windscreens, 49–65. Wiesbaden : Springer Fachmedien Wiesbaden, 2022. http://dx.doi.org/10.1007/978-3-658-36788-6_4.

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Anderson, T. L. « Two-Parameter Fracture Mechanics : A Comparison of Continuum and Micromechanics Approaches ». Dans Fracture of Engineering Materials and Structures, 767–72. Dordrecht : Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3650-1_114.

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van Mier, J. G. M. « A solution to the parameter-identification conundrum : multi-scale interaction potentials ». Dans Fracture Phenomena in Nature and Technology, 171–83. Cham : Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04397-5_13.

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Han, Seok Yoon, J. S. Maeng, S. H. Kim et J. Y. Park. « Parameter Optimization of a Static Micro-Mixer Using a Sequential Approximate Optimization Method ». Dans Fracture and Strength of Solids VI, 471–76. Stafa : Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-989-x.471.

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Actes de conférences sur le sujet "Fracture parameter"

Li, Lin, Guangzhi Zhang, Xiaolong Guo et Bingyi Du. « Azimuthal Fourier coefficients inversion for effective stress parameter and fracture parameters ». Dans First International Meeting for Applied Geoscience & Energy. Society of Exploration Geophysicists, 2021. http://dx.doi.org/10.1190/segam2021-3593922.1.

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Sabinin, Grigory, Tatiana Chichinina, Vadim Tulchinsky et Manuel Romero-Salcedo. « Machine Learning for Fracture Parameter Estimation in Fractured Reservoirs from Seismic Data ». Dans SPE Russian Petroleum Technology Conference. Society of Petroleum Engineers, 2020. http://dx.doi.org/10.2118/201934-ms.

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Sabinin, Grigory, Tatiana Chichinina, Vadim Tulchinsky et Manuel Romero-Salcedo. « Machine Learning for Fracture Parameter Estimation in Fractured Reservoirs from Seismic Data (Russian) ». Dans SPE Russian Petroleum Technology Conference. Society of Petroleum Engineers, 2020. http://dx.doi.org/10.2118/201934-ru.

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Chen, Xiaowei, Colin Pennington, Raymond Ng, Nori Nakata et Jiewen Zhang. « Source parameter analysis of microseismicity during hydraulic fracture : Pinning stress distributions within fracture zone ». Dans SEG Technical Program Expanded Abstracts 2019. Society of Exploration Geophysicists, 2019. http://dx.doi.org/10.1190/segam2019-3216218.1.

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Yousef, B., D. A. Angus, M. W. Hildyard, J. P. Verdon et M. Perry. « Full Waveform Model Validation of Microseismic Shear-wave Splitting Fracture Parameter Inversion ». Dans Second Workshop on Naturally Fractured Reservoirs. Netherlands : EAGE Publications BV, 2013. http://dx.doi.org/10.3997/2214-4609.20132015.

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Wang, W. X., et Z. P. Jia. « Rock Porosity and Fracture Parameter Estimation by Image Technique ». Dans 2009 Third International Symposium on Intelligent Information Technology Application. IEEE, 2009. http://dx.doi.org/10.1109/iita.2009.441.

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Elbel, J. L. « Parameter Accuracy Required for Real-Time Fracture Geometry Simulation ». Dans Low Permeability Reservoirs Symposium. Society of Petroleum Engineers, 1989. http://dx.doi.org/10.2118/19001-ms.

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Chen, Huaizhen, Guangzhi Zhang et Xingyao Yin. « AVAZ inversion for elastic parameter and fracture fluid factor ». Dans SEG Technical Program Expanded Abstracts 2012. Society of Exploration Geophysicists, 2012. http://dx.doi.org/10.1190/segam2012-0067.1.

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Wang, W., Ch Z. Wang et Y. Z. Hu. « Rock porosity and fracture parameter estimation by image technique ». Dans SPIE Europe Optical Metrology, sous la direction de Peter H. Lehmann. SPIE, 2009. http://dx.doi.org/10.1117/12.827431.

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Aggelis, Dimitrios, J. Blom, Sven De Sutter, Svetlana Verbruggen, Maria Strantza, Tine Tysmans, Anastasios Mpalaskas et Phuoc Luong Nguyen. « Fracture monitoring by acoustic emission : recent applications of parameter-based characterization ». Dans 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures. IA-FraMCoS, 2016. http://dx.doi.org/10.21012/fc9.237.

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Rapports d'organisations sur le sujet "Fracture parameter"

Baron, D. T. Fracture Parameter Calculations for SENT Specimens with Two Boundary Conditions. Fort Belvoir, VA : Defense Technical Information Center, janvier 1997. http://dx.doi.org/10.21236/ada386841.

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Tsang, Chin-Fu. A borehole fluid conductivity logging method for the determination of fracture inflow parameters. Office of Scientific and Technical Information (OSTI), octobre 1987. http://dx.doi.org/10.2172/5477039.

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ZHENG, Lei, Yongzhang ZHOU, Junguo HE, Hongzhong LI et Changyu ZENG. Estimation of mainly rheological parameters of Pangxitong-Jinkeng structural fracture zone, Guangdong, China. Cogeo@oeaw-giscience, septembre 2011. http://dx.doi.org/10.5242/iamg.2011.0112.

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Zavarin, M. Matrix Diffusion and Colloid-Facilitated Transport in Fractured Rocks : Model and Parameter Validation. Office of Scientific and Technical Information (OSTI), août 2002. http://dx.doi.org/10.2172/15013603.

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Magnuson, S. O. Inverse modeling for field-scale hydrologic and transport parameters of fractured basalt. Office of Scientific and Technical Information (OSTI), décembre 1995. http://dx.doi.org/10.2172/201576.

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S. Finsterle. Impact of Parameter Uncertainty, Variability, and Conceptual Model Errors on Predictions of Flow Through Fractured Porous Media. Office of Scientific and Technical Information (OSTI), septembre 2000. http://dx.doi.org/10.2172/840685.

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Ghadiali, N., G. Wilkowski, S. Rahman et Y. H. Choi. Deterministic and probabilistic evaluations for uncertainty in pipe fracture parameters in leak-before-break and in-service flaw evaluations. Office of Scientific and Technical Information (OSTI), juin 1996. http://dx.doi.org/10.2172/256412.

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Drozhko, E. G., Yu G. Mokrov, Yu V. Glagolenko et L. M. Samsonova. Determination of Hydrologic Parameters of Fractured Rock Mass Based on Regional Groundwater Level Data in the Lake Karachai Area. Office of Scientific and Technical Information (OSTI), septembre 1996. http://dx.doi.org/10.2172/760314.

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Runjic, Frane, Andrija Matetic, Matjaz Bunc, Nikola Crncevic et Ivica Kristic. Small Degenerated Surgical Bioprosthetic Valve should be Treated with SupraAnnular Valve-in-Valve Transcatheter Aortic Valve Replacement. Science Repository, décembre 2021. http://dx.doi.org/10.31487/j.jicoa.2021.04.02.

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Résumé :

Background: Patient-prothesis mismatch (PPM) is a serious potential complication following surgical aortic valve replacement (SAVR). If it develops, valve-in-valve transcatheter aortic valve replacement (TAVR) is a reasonable therapeutic option. However, there is low evidence on the management of small degenerated surgical bioprosthetic valves, not prone to balloon-valve fracture (BVF). Case Presentation: This case report presents a successful valve-in-valve TAVR in acute heart failure due to degenerative surgical bioprosthetic valve Trifecta (21 mm) that is not susceptible to BVF. Standard preparation for transfemoral TAVR with a self-expandable valve was conducted, including the over-the-wire pacing. Thereafter, a successful valve-in-valve primary implantation of the self-expanding, supra-annular valve Evolut R 26 (Medtronic™) has been achieved. Follow-up at 3 months showed mild paravalvular leak in the region with clinical and heart function improvements of the patient. Follow-up echocardiographic parameters showed the reduction of anterograde flow impairment and improved effective orifice area (~0.85 cm2/m2). Conclusion: In conclusion, supra-annular valve-in-valve TAVR is a potential therapeutic option for PPM of small degenerated surgical bioprosthetic valves which are not prone to BVF.

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Makedonska, Nataliia, Edward Michael Kwicklis, Jeffrey De'Haven Hyman et Suzanne Michelle Bourret. Discrete Fracture Network Modeling to Estimate Upscaled Parameters for the Topopah Spring, Lava Flow, and Tiva Canyon Aquifers at Pahute Mesa, Nevada National Security Site. Office of Scientific and Technical Information (OSTI), mai 2020. http://dx.doi.org/10.2172/1623419.

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