Bibliografie tematiche / Reservoir concept

Letteratura scientifica selezionata sul tema "Reservoir concept"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 19 febbraio 2022

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Articoli di riviste sul tema "Reservoir concept"

Yu, Da-jin, Zhengwei Zou e Jin Li. "Evaluation of reservoir management modernization under the concept of coordinated development". Water Supply 20, n. 8 (3 agosto 2020): 3697–706. http://dx.doi.org/10.2166/ws.2020.175.

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Abstract The modernization of reservoir management is of great significance to the coordinated development of the region. There are many factors affecting the modernization of reservoir management, and there is a certain degree of ambiguity, randomness and uncertainty among the factors. It is difficult to evaluate the modernization of reservoir management comprehensively by traditional methods. This study first studies the connotation of reservoir management modernization under the concept of coordinated development; that is, securitization, economization, scientificalization and greenization. On this basis, a modernization evaluation system and AHP-Fuzzy evaluation model for reservoir management are constructed. Then, an empirical study is conducted with six large reservoirs in Jiangxi Province of China. The results show that the modernization level of large-scale reservoir management in Jiangxi Province is generally above the middle level, and the economic management and engineering management level of some reservoirs is relatively low, resulting in a low scientific and economic level of reservoir management, which is a key factor restricting the process of reservoir management modernization.

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Yuan, Bin, Zhenzihao Zhang e Christopher R. Clarkson. "Improved Distance-of-Investigation Model for Rate-Transient Analysis in a Heterogeneous Unconventional Reservoir With Nonstatic Properties". SPE Journal 24, n. 05 (2 luglio 2019): 2362–77. http://dx.doi.org/10.2118/191698-pa.

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Summary The concept of distance of investigation (DOI) has been widely applied in rate– and pressure–transient analysis for estimating reservoir properties and for optimizing hydraulic fracturing. Despite its successful application in conventional reservoirs, significant errors arise when extending the concept to unconventional reservoirs. This work aims to clearly demonstrate such errors when using the traditional square–root–of–time model for DOI calculations in unconventional reservoirs, and to develop new models to improve the DOI calculations. In this work, the following mechanisms in unconventional reservoirs are first incorporated into the calculation of DOI: (1) pressure–dependency of rock and fluid properties; (2) continuous/discontinuous spatial variation of reservoir properties. To achieve this, pseudopressure, pseudotime, and pseudodistance are introduced to linearize the diffusivity equation. Two novel methods are developed for calculating DOI: one using the concept of continuous succession of steady states, and the other using the concept of dynamic drainage area (DDA). Both models are verified using a series of fine–grid numerical simulations. A production–data–analysis workflow using the new DOI models is proposed to analytically characterize reservoir heterogeneity and fracture properties. The new DOI models compensate for the inability of the traditional square–root–of–time model to capture spatial and temporal variations of reservoir and fluid properties. The pressure–dependency of fluids and reservoirs (i.e., fluid density, fluid viscosity, rock permeability, and rock porosity) and reservoir heterogeneities (i.e., deterioration of reservoir quality from the primary fracture to the reservoir) can significantly retard the propagation of the DOI. Another important outcome of this work is to provide a practical and analytical approach to directly estimate the spatial heterogeneity from the production history of field cases.

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Sass, Ingo, e Annette E. Götz. "Geothermal reservoir characterization: a thermofacies concept". Terra Nova 24, n. 2 (28 gennaio 2012): 142–47. http://dx.doi.org/10.1111/j.1365-3121.2011.01048.x.

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Baumgartner, M. T., G. Baumgartner e L. C. Gomes. "Spatial and temporal variations in fish assemblage: testing the zonation concept in small reservoirs". Brazilian Journal of Biology 78, n. 3 (7 dicembre 2017): 487–500. http://dx.doi.org/10.1590/1519-6984.170424.

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Abstract Large reservoirs usually present spatial gradients in fish assemblage, distinguishing three strata (littoral, pelagic, and bathypelagic) along the vertical and horizontal axes, and three zones (fluvial, transitional, and lacustrine) along the longitudinal axis. The main objective of this study was to assess if small reservoirs also present the spatial gradients in fish assemblage attributes and structure as already observed in large reservoirs. Fish surveys were conducted quarterly, from 2003 to 2008, in the Mourão Reservoir (Mourão River, Paraná, Brazil), using gillnets with different mesh sizes, arranged in all strata of all three zones. Community attributes (species richness and evenness) were calculated for each sample, and differences were tested using three-way ANOVA (factors: zone, strata, year). Community composition was summarized using Correspondence Analysis (CA) and differences were tested with three-way ANOVA for each axis, controlling the same three factors. Because of the high variability in reservoir water level through time, all analyses were made considering temporal variations. Species richness presented a decreasing trend from fluvial to lacustrine zones, and higher values in littoral strata, possibly because upper reaches and littoral regions provide better conditions for fish to feed and to reproduce. Evenness was considerably low, presenting high variability, and no evident pattern. The expected longitudinal gradient was not found in this study indicating longitudinal similarity, contrary to observed in large reservoirs. Vertical and horizontal gradients were observed in all sampling stations, indicating that abiotic and biotic conditions are influencing fish distributions within the reservoir.

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O'Dell, Mike, e Edwin Lamers. "Subsurface Uncertainty Management and Development Optimization in the Harweel Cluster, South Oman". SPE Reservoir Evaluation & Engineering 8, n. 02 (1 aprile 2005): 164–68. http://dx.doi.org/10.2118/89110-pa.

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Summary In the past 5 years, there has been a string of exploration successes in discovering some 350 million m3 (2 billion bbl) of oil in the Harweel Clusterin south Oman. This oil is deep, under high pressure, and comes with a high gas/oil ratio (GOR), and the fluids contain 15% CO2 and 5% H2S. Of the nine Precambrian carbonate reservoirs, six are lithostatically pressured, and three are hydrostatic. The Harweel Cluster is more than 70 km from existing infrastructure. If gas can be reinjected, miscible displacement is expected in many of the reservoirs. The Harweel Cluster is one of Oman's major opportunities for "green field" oil development. There is a large degree of subsurface uncertainty in gross rock volume and oil/water contact (OWC), reservoir architecture, faults and fractures and reservoir compartmentalization, degree of dolomitization, permeability level and heterogeneity, fluid properties, and so on. However, little is known about the scale and relative importance of each of these uncertainties. Some uncertainties, such as compositional grading, might turn out to be more important than anticipated when evaluating development options because of nonlinearities and dependencies. Analyzing the effects of all uncertainty combinations in all reservoirs is not a realistic option. Therefore, a structured scenario-based approach has been developed to analyze and assess all potential factors influencing recovery schemes, reserves, and productivity. After evaluating the range of possible values and calculating the impact of each uncertainty, realizations were created to represent the range of possible values in each new reservoir. Field-scale equation-of-state models were used to simulate both primary depletion and gas reinjection. Development scenarios were optimized for each discrete realization. The resulting reservoir models serve as a basis for the development-concept selection and the subsequent field-development plans. Introduction The Harweel Cluster consists of nine reservoirs found in two formations in seven distinct fields. The fields were discovered between 1997 and 2002, and there is an ongoing exploration program in the area. The fields are Dafaq, Ghafeer, Harweel Deep, Rabab, Sakhiya, Sarmad, and Zalzala. The formations areA2C and A3C; these names are abbreviations for Ara Formation cycle 2 and 3Carbonates. All the reservoirs are intra salt carbonate reservoirs. Only Ghafeer and Sakhiya have reservoirs in both formations. These reservoirs are collectively called the Harweel Cluster because they form a cluster of reservoirs, and Harweel Deep was the first reservoir to be discovered. The reservoirs generally have low permeability (1 to 10 md), and they contain a wide range of fluid properties from retrograde gas condensate to black oil with moderate GOR (185 m3/m3). The highest level of the development concept is that they will be developed with a shared central facility. This cost-saving measure has been decided, but more detailed aspects of the development concept are still open for rigorous study, appraisal, and testing. Rigorous study began in2001 after discovery and reserve booking exercises for the individual reservoirs. With only the highest level of the development concept fixed, the study team had to develop an uncertainty-management scheme for evaluation of the cluster. Subsurface uncertainties were organized into 24 categories in eight major groups: gross rock volume, saturation, reservoir architecture, faults and fractures, reservoir properties, pressure/volume/temperature (PVT), relative permeability, compaction, and compressibility. Analyzing the effects of all uncertainty combinations in all reservoirs (more than 1 million permutations for each of the nine reservoirs) is not a realistic option. Therefore, a structured approach is required to analyze and assess all potential factors influencing recovery schemes, reserves, and productivity. A consistent process has been set up to (1) build reservoir models, (2) identify the critical uncertainties, (3) cover the full range of potential subsurface realizations, and (4) optimize the development. These reservoir models serve as a basis for the development concept selection and the subsequent field- and asset-development plans. The scenario-modeling process is illustrated schematically in Fig. 1.

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Wu, Jun Lai, Yue Tian Liu e Hai Ning Yang. "Parameters Optimization of Stereoscopic Horizontal Well Patterns by Using Numerical Reservoir Simulation". Advanced Materials Research 433-440 (gennaio 2012): 2602–6. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.2602.

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Well pattern is the most important affecting factor to the ultimate recovery for an oilfield development. Many researches are reported on areal well pattern, which is widely used in conventional reservoirs development such as low permeability reservoirs, heavy oil reservoirs, multi-layer sandstone reservoirs, etc. In this paper, according to the geological characteristics of fractured buried hill reservoir of Liaohe Oilfield, we firstly present the concept of stereoscopic well patterns and compare it with common areal water flooding. By using numerical reservoir simulation method, we design and optimize the parameters of 5-spot stereoscopic horizontal well patterns, including payzone thickness and horizontal well length under different anisotropic factors of fracture permeability. This can be successfully applied on the development of MM block fractured buried hill reservoir of Liaohe Oilfield.

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Pal, U., A. Belaı̈d e Ch Choisy. "Touching numeral segmentation using water reservoir concept". Pattern Recognition Letters 24, n. 1-3 (gennaio 2003): 261–72. http://dx.doi.org/10.1016/s0167-8655(02)00240-4.

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Bai, Xiangwu, Zhiping Li e Fengpeng Lai. "Optimal Selection Method for Sweet Spots in Low-Permeability Multilayered Reservoirs". Geofluids 2021 (18 gennaio 2021): 1–10. http://dx.doi.org/10.1155/2021/6698010.

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Low-permeability oil reservoirs account for more than two-thirds of China’s proven reserves, and most of them are multilayered; the traditional sweet spots focus on single-layered reservoirs. The sweet spots of low-permeability reservoirs have two meanings: the geologically superior reservoir and the beneficial development of the reservoir. In this study, a concept of reservoir stratification coefficient is proposed to evaluate the characteristics of multilayered reservoirs, and three indicators are proposed, namely, reservoir stratification coefficient, energy storage coefficient, and stratigraphic coefficient, as the indicators of sweet spots of multilayered reservoirs. The three indicators are combined into a single indicator using a weighted approach, and the sweet spots can be identified based on the combined indicator. The Xiliu A area of the North China oilfield was selected for a case study. According to the structural, sedimentary, and reservoir characteristics of the block, combined with the development and production conditions, the Sha 3 Member I oil group was selected as the study object of sweet spots of the low-permeability reservoir. The results show that the reservoir stratification coefficient, energy storage coefficient, and stratigraphic coefficient proposed in this study are effective indicators for the preferential selection of sweet spots, which can reflect the longitudinal heterogeneity, energy storage size, and flow capacity of multilayered reservoirs. After a comparative analysis with actual blocks, it was found that the results obtained using the method are consistent with the actual capacity of the reservoir. The production capacity is high. The evaluation effect is ideal, and the applicability is good. Thus, this study provides a new technical method for the evaluation of similar multilayered reservoirs. The findings of this study can help for a better understanding of the development and production conditions and optimization basis of low-permeability reservoirs.

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Krajewski, Adam, e Anna E. Sikorska-Senoner. "Suspended sediment routing through a small on-stream reservoir based on particle properties". Journal of Soils and Sediments 21, n. 3 (9 gennaio 2021): 1523–38. http://dx.doi.org/10.1007/s11368-020-02872-0.

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Abstract Purpose A novel concept of suspended sediment (SS) routing through a small reservoir is proposed that relies on the particle properties in the reservoir inflow. Methods The SS routing through the reservoir is described following the single continuous stirred tank reactor concept with only one model parameter, the SS decay coefficient. This parameter is linked to the sediment settling velocity and water flow velocity. Hence, the model does not require a direct calibration with recorded data. This model was tested on a small reservoir in Warsaw, Poland, with seven storm events. Suspended sediment samples at the reservoir inflow and outflow were taken manually during the passage of flood flows at irregular intervals. The performance of the proposed method was verified with the approach when the model parameter is estimated directly from recorded events. Results The parameter calculated based on particle properties was about 10 times higher than the corresponding parameter optimized from recorded SS events. Hence, there was a need to introduce a correction factor to accurately predict the effluent SS. This led to a high model performance for all events (Nash-Sutcliffe = 0.672 on average). Conclusions (i) The proposed SS routing model based on particle properties has been proven to accurately simulate SS in the reservoir outlet. (ii) Thus, the parameter can be estimated from the sediment settling velocity and water flow velocity, but the correction factor must be applied. (iii) Our findings acknowledge difficulties in describing SS routing through small reservoirs and indicate a lack of knowledge on the functioning of these reservoirs.

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Ahmed, Rayan. "Geological Model for Mauddud Reservoir Khabaz Oil Field". Iraqi Geological Journal 54, n. 1D (30 aprile 2021): 29–42. http://dx.doi.org/10.46717/igj.54.1d.3ms-2021-04-23.

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The Mauddud reservoir, Khabaz oil field which is considered one of the main carbonate reservoirs in the north of Iraq. Recognizing carbonate reservoirs represents challenges to engineers because reservoirs almost tend to be tight and overall heterogeneous. The current study concerns with geological modeling of the reservoir is an oil-bearing with the original gas cap. The geological model is establishing for the reservoir by identifying the facies and evaluating the petrophysical properties of this complex reservoir, and calculate the amount of hydrocarbon. When completed the processing of data by IP interactive petrophysics software, and the permeability of a reservoir was calculated using the concept of hydraulic units then, there are three basic steps to construct the geological model, starts with creating a structural, facies and property models. The reservoirs were divided into four zones depending on the variation of petrophysical properties (porosity and permeability). Nine wells that penetrate the Cretaceous Formation (Mauddud reservoir) are included to construct the geological model. Zone number three characterized as the most important due to it Is large thickness which is about 108 m and good petrophysical properties are about 13%, 55 md, 41% and 38% for porosity, permeability, water saturation and net to gross respectively. The initial oil and gas in place are evaluated to be about 981×106 STB and 400×109 SCF.

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Più fonti

Tesi sul tema "Reservoir concept"

Martinenghi, Romain. "Démonstration opto-électronique du concept de calculateur neuromorphique par Reservoir Computing". Thesis, Besançon, 2013. http://www.theses.fr/2013BESA2052/document.

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Le Reservoir Computing (RC) est un paradigme s’inspirant du cerveau humain, apparu récemment au début des années2000. Il s'agit d'un calculateur neuromorphique habituellement décomposé en trois parties dont la plus importanteappelée "réservoir" est très proche d'un réseau de neurones récurrent. Il se démarque des autres réseaux de neuronesartificiels notamment grâce aux traditionnelles phases d'apprentissage et d’entraînement qui ne sont plus appliquées surla totalité du réseau de neurones mais uniquement sur la lecture du réservoir, ce qui simplifie le fonctionnement etfacilite une réalisation physique. C'est précisément dans ce contexte qu’ont été réalisés les travaux de recherche de cettethèse, durant laquelle nous avons réalisé une première implémentation physique opto-électronique de système RC.Notre approche des systèmes physiques RC repose sur l'utilisation de dynamiques non-linéaires à retards multiples dansl'objectif de reproduire le comportement complexe d'un réservoir. L'utilisation d'un système dynamique purementtemporel pour reproduire la dimension spatio-temporelle d'un réseau de neurones traditionnel, nécessite une mise enforme particulière des signaux d'entrée et de sortie, appelée multiplexage temporel ou encore étape de masquage. Troisannées auront été nécessaires pour étudier et construire expérimentalement nos démonstrateurs physiques basés sur desdynamiques non-linéaires à retards multiples opto-électroniques, en longueur d'onde et en intensité. La validationexpérimentale de nos systèmes RC a été réalisée en utilisant deux tests de calcul standards. Le test NARMA10 (test deprédiction de séries temporelles) et la reconnaissance vocale de chiffres prononcés (test de classification de données) ontpermis de quantifier la puissance de calcul de nos systèmes RC et d'atteindre pour certaines configurations l'état del'art
Reservoir Computing (RC) is a currently emerging new brain-inspired computational paradigm, which appeared in theearly 2000s. It is similar to conventional recurrent neural network (RNN) computing concepts, exhibiting essentiallythree parts: (i) an input layer to inject the information in the computing system; (ii) a central computational layercalled the Reservoir; (iii) and an output layer which is extracting the computed result though a so-called Read-Outprocedure, the latter being determined after a learning and training step. The main originality compared to RNNconsists in the last part, which is the only one concerned by the training step, the input layer and the Reservoir beingoriginally randomly determined and fixed. This specificity brings attractive features to RC compared to RNN, in termsof simplification, efficiency, rapidity, and feasibility of the learning, as well as in terms of dedicated hardwareimplementation of the RC scheme. This thesis is indeed concerned by one of the first a hardware implementation of RC,moreover with an optoelectronic architecture.Our approach to physical RC implementation is based on the use of a sepcial class of complex system for the Reservoir,a nonlinear delay dynamics involving multiple delayed feedback paths. The Reservoir appears thus as a spatio-temporalemulation of a purely temporal dynamics, the delay dynamics. Specific design of the input and output layer are shownto be possible, e.g. through time division multiplexing techniques, and amplitude modulation for the realization of aninput mask to address the virtual nodes in the delay dynamics. Two optoelectronic setups are explored, one involving awavelength nonlinear dynamics with a tunable laser, and another one involving an intensity nonlinear dynamics with anintegrated optics Mach-Zehnder modulator. Experimental validation of the computational efficiency is performedthrough two standard benchmark tasks: the NARMA10 test (prediction task), and a spoken digit recognition test(classification task), the latter showing results very close to state of the art performances, even compared with purenumerical simulation approaches

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Susanto, Benny Laurensius Materials Science &amp Engineering Faculty of Science UNSW. "Kinetics of carbide dissolution in chromium + molybdenum steels during oxidation". Awarded by:University of New South Wales. Materials Science and Engineering, 2004. http://handle.unsw.edu.au/1959.4/19385.

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Iron-based alloys containing 15% chromium, 2-3% molybdenum and 0.02-1.7% carbon, consisting of M23C6 and M6C carbides in an austenitic matrix were oxidised at 8500C to study their oxidation resistance and a precipitate-free zone formation. Alloy design was carried out using a thermodynamic software Thermo-Calc. Carbides in these alloys were expected to dissolve during oxidation, releasing chromium required for the protective oxide formation. Decarburisation of the matrix was expected to trigger the carbide dissolution, and form a precipitate-free zone. Transformation of the austenitic into ferritic matrix in the precipitate-free zone was expected be essential for providing a fast chromium supply to the oxide/alloy interface. Upon exposure to pure oxygen, most of the alloys oxidised non-protectively due to the fast oxidation attack and low chromium content in the matrix, while carbide dissolution was too slow. The alloys were then pre-oxidised in H2+10%H2O to grow a purely chromia scale. In this low oxygen partial pressure environment, carbides in the alloy's sub-surface dissolved and formed a ferritic precipitate-free zone. The precipitate dissolution model developed by previous investigators was then tested and proven to be valid in this iron-based alloy system. The endurance of the pre-formed chromia scale with its underlying precipitate-free zone was then tested in pure oxygen environment. All of the alloys that had successfully developed a ferritic precipitate-free zone in the pre-oxidation stage, survived the subsequent oxidation in pure oxygen up until 3 weeks observation. Although x-ray diffraction found some minor iron oxides, the oxide consisted of mainly Cr2O3. Since iron activity had increased and iron oxides had become stable after the pure oxygen gas was introduced, the growth of the precipitate-free zone had to compete with the rate at which it was consumed by oxidation. It was concluded that the transformation from austenite to ferrite at the subsurface region of the alloy could be achieved provided that the volume fraction of the carbides did not exceed 0.2. Evidence indicated that the chromia scale grew by chromium provided by the dissolving carbides. Pre-oxidation led to a promising use of the alloys at atmospheric oxygen pressure.

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Pesaranghader, Ali. "A Reservoir of Adaptive Algorithms for Online Learning from Evolving Data Streams". Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/38190.

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Continuous change and development are essential aspects of evolving environments and applications, including, but not limited to, smart cities, military, medicine, nuclear reactors, self-driving cars, aviation, and aerospace. That is, the fundamental characteristics of such environments may evolve, and so cause dangerous consequences, e.g., putting people lives at stake, if no reaction is adopted. Therefore, learning systems need to apply intelligent algorithms to monitor evolvement in their environments and update themselves effectively. Further, we may experience fluctuations regarding the performance of learning algorithms due to the nature of incoming data as it continuously evolves. That is, the current efficient learning approach may become deprecated after a change in data or environment. Hence, the question 'how to have an efficient learning algorithm over time against evolving data?' has to be addressed. In this thesis, we have made two contributions to settle the challenges described above. In the machine learning literature, the phenomenon of (distributional) change in data is known as concept drift. Concept drift may shift decision boundaries, and cause a decline in accuracy. Learning algorithms, indeed, have to detect concept drift in evolving data streams and replace their predictive models accordingly. To address this challenge, adaptive learners have been devised which may utilize drift detection methods to locate the drift points in dynamic and changing data streams. A drift detection method able to discover the drift points quickly, with the lowest false positive and false negative rates, is preferred. False positive refers to incorrectly alarming for concept drift, and false negative refers to not alarming for concept drift. In this thesis, we introduce three algorithms, called as the Fast Hoeffding Drift Detection Method (FHDDM), the Stacking Fast Hoeffding Drift Detection Method (FHDDMS), and the McDiarmid Drift Detection Methods (MDDMs), for detecting drift points with the minimum delay, false positive, and false negative rates. FHDDM is a sliding window-based algorithm and applies Hoeffding’s inequality (Hoeffding, 1963) to detect concept drift. FHDDM slides its window over the prediction results, which are either 1 (for a correct prediction) or 0 (for a wrong prediction). Meanwhile, it compares the mean of elements inside the window with the maximum mean observed so far; subsequently, a significant difference between the two means, upper-bounded by the Hoeffding inequality, indicates the occurrence of concept drift. The FHDDMS extends the FHDDM algorithm by sliding multiple windows over its entries for a better drift detection regarding the detection delay and false negative rate. In contrast to FHDDM/S, the MDDM variants assign weights to their entries, i.e., higher weights are associated with the most recent entries in the sliding window, for faster detection of concept drift. The rationale is that recent examples reflect the ongoing situation adequately. Then, by putting higher weights on the latest entries, we may detect concept drift quickly. An MDDM algorithm bounds the difference between the weighted mean of elements in the sliding window and the maximum weighted mean seen so far, using McDiarmid’s inequality (McDiarmid, 1989). Eventually, it alarms for concept drift once a significant difference is experienced. We experimentally show that FHDDM/S and MDDMs outperform the state-of-the-art by representing promising results in terms of the adaptation and classification measures. Due to the evolving nature of data streams, the performance of an adaptive learner, which is defined by the classification, adaptation, and resource consumption measures, may fluctuate over time. In fact, a learning algorithm, in the form of a (classifier, detector) pair, may present a significant performance before a concept drift point, but not after. We define this problem by the question 'how can we ensure that an efficient classifier-detector pair is present at any time in an evolving environment?' To answer this, we have developed the Tornado framework which runs various kinds of learning algorithms simultaneously against evolving data streams. Each algorithm incrementally and independently trains a predictive model and updates the statistics of its drift detector. Meanwhile, our framework monitors the (classifier, detector) pairs, and recommends the efficient one, concerning the classification, adaptation, and resource consumption performance, to the user. We further define the holistic CAR measure that integrates the classification, adaptation, and resource consumption measures for evaluating the performance of adaptive learning algorithms. Our experiments confirm that the most efficient algorithm may differ over time because of the developing and evolving nature of data streams.

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Zambo, Abou'ou Marcelle Nina. "Instabilité modulationnelle et concept de réservoir de photons dans les fibres optiques à très forte non linéarité". Thesis, Dijon, 2011. http://www.theses.fr/2011DIJOS045/document.

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Cette thèse présente des travaux portant sur l'instabilité modulationnelle (IM) dans des fibres optiques dotées à la fois d'une forte non linéarité et d'un fort coefficient d'absorption. Une analyse comparative des performances de plusieurs grandes classes de fibres (de verres silice et non silice) sur leur aptitude à générer des bandes latérales d'IM avec un minimum de puissance de pompe, et sur la plus courte distance possible, est effectuée. Les fibres de verres non silice de type Chalcogénure ou Tellure apparaissent à première vue comme étant les plus performantes, mais un examen attentif révèle que leurs spectres sont altérés par un phénomène de dérive en fréquence des bandes latérales d'IM, qui est provoquée par une forte absorption du laser de pompe. Nous développons alors une méthode qui permet de supprimer la dérive en fréquence des bandes latérales d'IM dans les fibres à fort coefficient d'absorption. Cette méthode, que nous avons baptisé "méthode du réservoir de photons", consiste à créer au sein de la fibre, par un ajustement approprié des paramètres de dispersion d'ordre deux et quatre, un réservoir de photons qui alimente in situ le processus d'IM en lui fournissant continuellement l'équivalent de la quantité de photons détruits par l'absorption matérielle au cours de la propagation. L'efficacité de la méthode du réservoir de photons est démontrée sur des processus d'IM aussi bien en configuration scalaire que vectorielle. Cette démonstration marque un progrès décisif vers des dispositifs de génération de fréquences optiques qui seront extrêmement précis et stables
This thesis considers modulational instability (MI) in optical fibers that have both a strong non-linearity and strong absorption coefficient. We carry out a comparative analysis of the performance of several major classes of silica- and non-silica glass fibers, on their ability to generate MI sidebands with a minimum of pump power, and over the shortest distance possible. Chalcogenide glass fibers appear at first sight as being the most competitive, but a careful examination reveals that their spectra are altered by a phenomenon of frequency drift of the MI sidebands, caused by a strong depletion of the pump. We have then developed a method which allows to suppress frequency drifts in MI processes in fibers having strong absorption parameters. The fundamental idea of this method, that we called "the photon reservoir method", is to create in the fiber, by an appropriate adjustment of the second-order and fourthorder dispersion coefficients, a photon reservoir which supplies (in situ) the MI process by continually providing the equivalent of the amount of photons destroyed by absorption during the propagation. We have demonstrated the effectiveness of the method of photon reservoir on MI processes, in scalarand vector configurations, using glass fibers endowed with extremely high nonlinear parameters. This method constitutes a decisive step forward in the development of highly competitive devices for optical frequency generation

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Hastings, Jonathan James. "Quantifying small-scale geological uncertainty in reservoir models". Thesis, Imperial College London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364781.

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Ketelsen, Søren, Giacomo Kolks, Torben Ole Andersen, Lasse Schmidt e Jürgen Weber. "Bootstrap reservoir concepts for electro-hydraulic compact cylinder drives". Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71233.

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This paper presents a conceptual study aiming to improve the compactness of electro-hydraulic compact drives (ECD ). In most current ECD architectures, gas accumulators are used as volume compensators for the flow imbalance emerging whenever asymmetric single rod cylinders are used. To stay within a required reservoir pressure range typically from two to four bar, a large gas volume is required, compromising system compactness. Combining conventional ECD architectures with a bootstrap reservoir offers a greater degree of freedom in system design, which enables downsizing or avoidance of the gas volume. Another potential benefit by including a bootstrap reservoir is the possibility of elevating the backpressure of the ECD thus enhancing drive stiffness, expanding the application range and market acceptance. Based on an open analysis of the solution space occurring when introducing a bootstrap reservoir, three system architectures are selected for a conceptual study. The results show that the downsizing potential is strongly dependent on the maximum friction force and the area ratio of the bootstrap reservoir pistons, while a linear analysis reveals that for some system architectures the bootstrap reservoir may severely influence the system dynamics. Simulation results confirm the functionality of the proposed system architectures, and show that a potential for downsizing/avoiding the gas volume, as well as increasing the ECD stiffness is present.

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Elsakout, Doaa Mostafa Ali. "Application of multilevel concepts for uncertainty quantification in reservoir simulation". Thesis, Heriot-Watt University, 2016. http://hdl.handle.net/10399/3146.

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Uncertainty quantification is an important task in reservoir simulation and is an active area of research. The main idea of uncertainty quantification is to compute the distribution of a quantity of interest, for example oil rate. That uncertainty, then feeds into the decision making process. A statistically valid way of quantifying the uncertainty is a Markov Chain Monte Carlo (MCMC) method, such as Random Walk Metropolis (RWM). MCMC is a robust technique for estimating the distribution of the quantity of interest. RWM is can be prohibitively expensive, due to the need to run a huge number of realizations, 45% - 70% of these may be rejected and, even for a simple reservoir model it may take 15 minutes for each realization. Hamiltonian Monte Carlo accelerates the convergence for RWM but may lead to a large increase computational cost because it requires the gradient. In this thesis, we present how to use the multilevel concept to accelerate convergence for RWM. The thesis discusses how to apply Multilevel Markov Chain Monte Carlo (MLMCMC) to uncertainty quantification. It proposes two new techniques, one for improving the proxy based on multilevel idea called Multilevel proxy (MLproxy) and the second one for accelerating the convergence of Hamiltonian Monte Carlo is called Multilevel Hamiltonian Monte Carlo (MLHMC). The idea behind the multilevel concept is a simple telescoping sum: which represents the expensive solution (e.g., estimating the distribution for oil rate on finest grid) in terms of a cheap solution (e.g., estimating the distribution for oil rate on coarse grid) and `correction terms', which are the difference between the high resolution solution and a low resolution solution. A small fraction of realizations is then run on the finer grids to compute correction terms. This reduces the computational cost and simulation errors significantly. MLMCMC is a combination between RWM and multilevel concept, it greatly reduces the computational cost compared to the RWM for uncertainty quantification. It makes Monte Carlo estimation a feasible technique for uncertainty quantification in reservoir simulation applications. In this thesis, MLMCMC has been implemented on two reservoir models based on real fields in the central Gulf of Mexico and in North Sea. MLproxy is another way for decreasing the computational cost based on constructing an emulator and then improving it by adding the correction term between the proxy and simulated results. MLHMC is a combination of Multilevel Monte Carlo method with a Hamiltonian Monte Carlo algorithm. It accelerates Hamiltonian Monte Carlo (HMC) and is faster than HMC. In the thesis, it has been implemented on a real field called Teal South to assess the uncertainty.

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Pinisetti, Moe. "Integrated numerical well test modelling in braided fluvial reservoirs". Thesis, Heriot-Watt University, 1999. http://hdl.handle.net/10399/609.

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Wilson, Benton Wade. "Modeling of performance behavior in gas condensate reservoirs using a variable mobility concept". Texas A&M University, 2003. http://hdl.handle.net/1969.1/317.

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The proposed work provides a concept for predicting well performance behavior in a gas condensate reservoir using an empirical model for gas mobility. The proposed model predicts the behavior of the gas permeability (or mobility) function in the reservoir as condensate evolves and the gas permeability is reduced in the near-well region due to the "condensate bank". The proposed model is based on observations of simulated reservoir performance and predicts the behavior of the gas permeability over time and radial distance. This model is given by: The proposed concept has potential applications in the development of a pressure-time-radius solution for gas condensate reservoirs experiencing this type of mobility behavior. We recognize that the proposed concept (i.e., a radially-varying gas permeability) is oversimplified, in particular, it ignores the diffusive effects of the condensate (i.e., the viscosity-compressibility behavior). However, we have effectively validated the proposed model using literature results derived from numerical simulation. This new solution is presented graphically in the form of "type curves." We propose that the "time" form of this solution be used for applications in well test analysis. Previous developments used for the analysis of well test data from gas condensate reservoirs consider the radial composite reservoir model, which utilizes a "step change" in permeability at some radial distance away from the wellbore. Using our proposed solution we can visualize the effect of the varying gas permeability in time and radius (a suite of (dimensionless) radius and time format plots are provided). In short, we can visualize the evolution of the condensate zone as it evolves in time and radial distance. A limitation is the simplified form of the kg profile as a function of radius and time - as well as the dependence/appropriateness of the α-parameter. While we suspect that the α-parameter represents the influence of both fluid and rock properties, we do not examine how such properties can be used to calculate the α-parameter.

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Mraz, Elena [Verfasser], Kurosch [Akademischer Betreuer] Thuro, Inga [Gutachter] Moeck, Thomas [Gutachter] Hamacher e Kurosch [Gutachter] Thuro. "Reservoir characterization to improve exploration concepts of the Upper Jurassic in the southern Bavarian Molasse Basin / Elena Mraz ; Gutachter: Inga Moeck, Thomas Hamacher, Kurosch Thuro ; Betreuer: Kurosch Thuro". München : Universitätsbibliothek der TU München, 2019. http://d-nb.info/1186256680/34.

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Libri sul tema "Reservoir concept"

Kofi, Asante-Duah D., e Zsuffa István, a cura di. Hydrological dimensioning and operation of reservoirs: Practical design concepts and principles. Dordrecht: Kluwer Academic Publishers, 2002.

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Perminov, A. V. Practical work on flow regulation. Publishing house of the Russian state agrarian University UN-TA im. K. A. Timiryazeva, 2021. http://dx.doi.org/10.26897/978-5-9675-1838-6-2021-153.

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The Tutorial structure includes the following elements: the concept and meaning of flow regulation, a reservoir and its place in the water management system, the calculations of seasonal and long-term flow management, calculations of flood regulation, determinations both main dam characteristics and the economics of water reservoir control.

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Lubaś, Jan, a cura di. Optimum concepts of unconventional reservoir development. Instytut Nafty i Gazu - Państwowy Instytut Badawczy, 2018. http://dx.doi.org/10.18668/pn2018.223.

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Lorenz, John C., e Scott P. Cooper. Applied Concepts in Fractured Reservoirs. Wiley & Sons, Incorporated, John, 2020.

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Lorenz, John C., e Scott P. Cooper. Applied Concepts in Fractured Reservoirs. Wiley & Sons, Limited, John, 2020.

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Lorenz, John C., e Scott P. Cooper. Applied Concepts in Fractured Reservoirs. Wiley & Sons, Incorporated, John, 2020.

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Edwards, Mark. The Power of God in Some Early Christian Texts. Oxford University Press, 2017. http://dx.doi.org/10.1093/acprof:oso/9780198767206.003.0010.

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This chapter delineates a typology of the power of God in early Christian sources, including the New Testament, Justin Martyr, and other apologists of the second century, such as Clement of Alexandria, Origen, and Athanasius. It argues that any investigation of the concept of dunamis in early Christian writings must begin with an acknowledgement of the Scriptures, maintaining that late antique Christianity should be considered as a distinct philosophical school, which had its own first principles, interpreted its own texts, and gave its own sense to terms that it used in common with other schools. Thus, a specifically Christian notion of divine power could have been born of reflection on the common ‘reservoir’ of Christian thought, any other influence being strictly secondary.

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In-Fisherman. Critical Concepts: Catfish Location: Finding Catfish in Lakes, Rivers, & Reservoirs (Critical Concepts). In-Fisherman, 2004.

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United States. Bureau of Reclamation. Mid-Pacific Regional Office. e United States. National Park Service., a cura di. Hetch Hetchy: A survey of water & power replacement concepts. Sacramento, Calif: Bureau of Reclamation, Mid-Pacific Region, 1988.

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Nagy, I. V., K. Asante-Duah e I. Zsuffa. Hydrological Dimensioning and Operation of Reservoirs: Practical Design Concepts and Principles. Springer, 2014.

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Capitoli di libri sul tema "Reservoir concept"

Albay, Meriç, e Reyhan Akçaalan. "Factors influencing the phytoplankton steady state assemblages in a drinking-water reservoir (Ömerli reservoir, Istanbul)". In Phytoplankton and Equilibrium Concept: The Ecology of Steady-State Assemblages, 85–95. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-2666-5_8.

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Leitão, M., S. M. Morata, S. Rodriguez e J. P. Vergon. "The Effect of perturbations on phytoplankton assemblages in a deep reservoir (Vouglans, France)". In Phytoplankton and Equilibrium Concept: The Ecology of Steady-State Assemblages, 73–83. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-2666-5_7.

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Hossain, Md Shabbir, Mervin Nair, Lariyah Mohd Sidek e Mohammad Marufuzzaman. "A Pre-release Concept for Reservoir Management and the Effect Analysis on Flood Control". In Water Resources Development and Management, 556–66. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-1971-0_54.

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Naselli-Flores, Luigi, e Rossella Barone. "Steady-state assemblages in a Mediterranean hypertrophic reservoir. The role of Microcystis ecomorphological variability in maintaining an apparent equilibrium". In Phytoplankton and Equilibrium Concept: The Ecology of Steady-State Assemblages, 133–43. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-2666-5_12.

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Hülsmann, Stephan, Karsten Rinke, Lothar Paul e Cristina Diez Santos. "Storage Reservoir Operation and Management". In Handbook of Water Resources Management: Discourses, Concepts and Examples, 777–99. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-60147-8_24.

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Feltrin, Glauco. "Some elementary concepts". In Absorbing Boundaries for the Time-Domain Analysis of Dam-Reservoir-Foundation Systems, 13–40. Basel: Birkhäuser Basel, 1997. http://dx.doi.org/10.1007/978-3-0348-7610-0_2.

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Archer, J. S., e C. G. Wall. "Concepts in Reservoir Modelling and Application to Development Planning". In Petroleum Engineering, 233–56. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-010-9601-0_14.

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Nagy, Imre V., Kofi Asante-Duah e Istvan Zsuffa. "Principles and Concepts in the Hydrologic Design and Operation of Storage Reservoirs". In Hydrological Dimensioning and Operation of Reservoirs, 61–84. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-015-9894-1_4.

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Lake, Larry W., Sanjay Srinivasan e Abraham John. "Statistical Scale-up: Concepts and Application to Reservoir Flow Simulation". In Geostatistics Banff 2004, 681–90. Dordrecht: Springer Netherlands, 2005. http://dx.doi.org/10.1007/978-1-4020-3610-1_69.

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MARTINIUS, ALLARD W., CARSTEN ELFENBEIN e KEVIN J. KEOGH. "Applying accommodation versus sediment supply ratio concepts to stratigraphic analysis and zonation of a fluvial reservoir". In From Depositional Systems to Sedimentary Successions on the Norwegian Continental Margin, 101–25. Chichester, UK: John Wiley & Sons, Ltd, 2014. http://dx.doi.org/10.1002/9781118920435.ch4.

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Atti di convegni sul tema "Reservoir concept"

Rashdi, Khalil Al, e David Spain. "Barik Reservoir Description- An Evolving Concept". In SPE Middle East Unconventional Resources Conference and Exhibition. SPE, 2015. http://dx.doi.org/10.2118/spe-172912-ms.

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Abstract Khazzan field, situated in Block 61 in northern Oman, contains hydrocarbons at several deep levels, including the Barik, Miqrat, Amin and Buah formations. The Barik and Amin reservoirs are being developed in the southern portion of the block to produce 1 bcf/d of gas by end 2017. The development, jointly owned by Oman Oil Company (40%) and BP (60% and operator), will cost over 16 billion US$ and will include a central processing facility and surface facilities for about 300 wells. Most of the wells will be 1000m long horizontal wells, completed using multiple hydraulic fracturing techniques. The two other reservoirs, Miqrat and Buah, contain high H2S levels; these will not be developed at this phase due to high subsurface uncertainties and the cost to process the sour development. This paper presents a case study of an evolving reservoir description of a large, tight gas reservoir, the Barik Formation. It is rare to embark on a major “greenfield” reservoir development of a tight gas reservoir with limited static and almost no dynamic data. The reservoir description is essential to the successful evaluation and management of the inherent subsurface uncertainty at this stage in the field development. Building an associated appraisal plan and being flexible to new understanding is required to make the development a success. The reservoir description is guiding the ongoing appraisal activities in an attempt to reduce the risk and increase the overall project value. This paper presents the evolution of the reservoir description over the last 6 years of BP activity in Block 61 in the Sultanate of Oman. It reviews three stages of reservoir description: Pre-Appraisal, Mid-Appraisal, and Development. The pre-appraisal description was built using the pre-bid data package and published literature to support the commercial access decisions. The Mid Appraisal description provided a health-check for development readiness and appraisal plan revision. Finally, the Development description is presented in a 3D geo-cellular model which is based on the summary of the appraisal activities and supporting field development learnings. The paper discusses these descriptions and the benefits of the changing description, explanation of the advantages of front end loading at the early appraisal stage and how this has led us to our current state

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Cipolla, Craig, e Jon Wallace. "Stimulated Reservoir Volume: A Misapplied Concept?" In SPE Hydraulic Fracturing Technology Conference. Society of Petroleum Engineers, 2014. http://dx.doi.org/10.2118/168596-ms.

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Al Rashdi, Khalil, e David R. Spain. "Barik Reservoir Description - An Evolving Concept". In SPE Middle East Unconventional Resources Conference and Exhibition. Society of Petroleum Engineers, 2015. http://dx.doi.org/10.2118/172912-ms.

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Dzulkifli, Izyan Nadirah, Amy Mawarni M. Yusoff, Abdul Hakim Basri, Izzuddin Jamaludin, M. Rapi M. Som, M. Faizal M. Akram e M. Amri M. Diah. "Improving the Stratigraphic Concept of Channel Complex Reservoir of a Brown Field: A Case Study in Field A". In International Petroleum Technology Conference. IPTC, 2021. http://dx.doi.org/10.2523/iptc-21406-ms.

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Abstract Major reservoirs in Field A namely A-2, A-3U, A-3M, and A-3L, are deposited within a multi stacked channel complex system within Group I in Malay Basin. These reservoirs were previously understood based on existing data to have no or very minimal vertical communication between them and are treated as separate systems. In 2018, three wells were proposed to drain the attic oil in the north region of A-3U reservoir. When drilling these infill wells, it was discovered that the pressure has exceeded initial reservoir pressure although the reservoir has been idle for almost a year prior to the drilling. The results of the multi-rate test of two of the three infill wells that are less than 1 km apart are significantly different from one another. Post drilling, more tests were executed to investigate the connection between the sand. Studies were also done by incorporating the static and dynamic reservoir modeling data. Based on the result of the tests and studies, it was concluded that all of the major sands are connected at some areas. This new finding on the connectivity might be able to explain the additional volume needed to history match some of the reservoirs. Establishing stratigraphy concepts of a reservoir particularly in a channel complex system is an ongoing process, in this case, a brown field of almost 20 years of production. All data including new well data and dynamic data plays a vital role for a better understanding of the reservoir. It is essential to incorporate the updated geological understanding into the static model to have a representative simulation for better history matching and prediction. Moving forward, instead of building a separate grid model for each reservoir, a larger framework consist of intercalated reservoir grids will be built with this new geological understanding for dynamic simulation.

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Mendoza, Maria, Gonzalo Cevallos, Edison Molina, Silvia Piñeiros, Water Torres, Johnny Garrido, Ruben Gutierrez et al. "From Concept to Execution: A Successful Integrated Exploitation Philosophy". In SPE Reservoir Characterisation and Simulation Conference and Exhibition. Society of Petroleum Engineers, 2019. http://dx.doi.org/10.2118/196734-ms.

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G. Barker, R. "North Sea Buzzard Field 4D Concept - The Decision Making Process". In Third EAGE Workshop on Permanent Reservoir Monitoring 2015. Netherlands: EAGE Publications BV, 2015. http://dx.doi.org/10.3997/2214-4609.201411979.

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Belhaj, Hadi Arbi, Hossein Mousavizadegan, Fuxi Ma e M. Rafiqul Islam. "Reservoir Permeability: Innovative Measurement Based on Novel Concept". In SPE Western Regional/AAPG Pacific Section/GSA Cordilleran Section Joint Meeting. Society of Petroleum Engineers, 2006. http://dx.doi.org/10.2118/100427-ms.

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Nikolovski, M., M. Pesalj e M. Tcukanova. "Geomodeling Concept For The Reservoir With High Heterogeneity". In ECMOR XVI - 16th European Conference on the Mathematics of Oil Recovery. Netherlands: EAGE Publications BV, 2018. http://dx.doi.org/10.3997/2214-4609.201802136.

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Ursegov, S., A. Zakharian e V. Serkova. "Geological Modeling Of Reservoir Systems – An Adaptive Concept". In ECMOR XVI - 16th European Conference on the Mathematics of Oil Recovery. Netherlands: EAGE Publications BV, 2018. http://dx.doi.org/10.3997/2214-4609.201802191.

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Zhou, Jie, Subhadip Mandal, Feiyan Chen, Martin Quest e David Hume. "Reservoir Geomechanic Heterogeneity Index (RGHI): Concept, Methodology, and Application". In Unconventional Resources Technology Conference. Tulsa, OK, USA: American Association of Petroleum Geologists, 2018. http://dx.doi.org/10.15530/urtec-2018-2902828.

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Rapporti di organizzazioni sul tema "Reservoir concept"

Ayala, David, Ashley Graves, Colton Lauer, Henrik Strand, Chad Taylor, Kyle Weldon e Ryan Wood. Flooding Events Post Hurricane Harvey: Potential Liability for Dam and Reservoir Operators and Recommendations Moving Forward. A cura di Gabriel Eckstein. Texas A&M University School of Law Program in Natural Resources Systems, settembre 2018. http://dx.doi.org/10.37419/eenrs.floodingpostharvey.

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When Hurricane Harvey hit the Texas coast as a category 4 hurricane on August 25, 2017, it resulted in $125 billion in damage, rivaling only Hurricane Katrina in the amount of damage caused. It also resulted in the deaths of 88 people and destroyed or damaged 135,000 homes. Much of that devastation was the result of flooding. The storm dumped over 27 trillion gallons of rain over Texas in a matter of days. Some parts of Houston received over 50 inches of rainfall. The potential liability that dam and reservoir operators may face for decisions they make during storm and flooding events has now become a major concern for Texas citizens and its elected officials. Law suits have now been instituted against the federal government for its operation of two flood control reservoirs, as well as against the San Jacinto River Authority for its operation of a water supply reservoir. Moreover, the issues and concerns have been placed on the agenda of a number of committees preparing for the 2019 Texas legislative session. This report reviews current dam and reservoir operations in Texas and examines the potential liability that such operators may face for actions and decisions taken in response to storm and flooding events. In Section III, the report reviews dam gate operations and differentiates between water supply reservoirs and flood control reservoirs. It also considers pre-release options and explains why such actions are disfavored and not recommended. In Section IV, the report evaluates liabilities and defenses applicable to dam and reservoir operators. It explains how governmental immunity can limit the exposure of state and federally-run facilities to claims seeking monetary damages. It also discusses how such entities could be subject to claims of inverse condemnation, which generally are not subject to governmental immunity, under Texas law as well as under the Fifth Amendment to the U.S. Constitution. In addition, the Section discusses negligence and nuisance claims and concludes that plaintiffs asserting either or both of these claims will have difficulty presenting successful arguments for flooding-related damage and harm against operators who act reasonably in the face of storm-related precipitation. Finally, Section V offers recommendations that dam and reservoir operators might pursue in order to engage and educate the public and thereby reduce the potential for disputes and litigation. Specifically, the report highlights the need for expanded community outreach efforts to engage with municipalities, private land owners, and the business community in flood-prone neighborhoods both below and above a dam. It also recommends implementation of proactive flood notification procedures as a way of reaching and alerting as many people as possible of potential and imminent flooding events. Finally, the report proposes implementation of a dispute prevention and minimization mechanism and offers recommendations for the design and execution of such a program.

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