Global ETD Search

141	Non au gaz de schiste ! : cadrages et débordements de la controverse sur les hydrocarbures non conventionnels en France et au Québec / Shale gas, no! : framing and spillovers of the unconventional hydrocarbon controversy in France and Quebec Chailleux, Sébastien 01 December 2015 (has links) L’analyse de la controverse sur le gaz de schiste en France et au Québec à un niveauintermédiaire (méso) permet de souligner les processus de construction et contestation sociale etpolitique des différents cadrages soutenus par les réseaux d’acteurs en concurrence. Lesdynamiques d’intéressement à l’intérieur et à l’extérieur de l’action publique illustrent lesmultiples scènes et forums dans lesquels se déploie la controverse. L’analyse de la construction dece problème public et ses diverses redéfinitions démontre le rôle central du cadrage politique descontroverses. Les solutions retenues définissent tout autant qu’elles tentent de réduire le risquerelatif à cette nouvelle industrie gazière (face à un risque cadré comme technologique en France,on observe un cadrage sur l’acceptabilité sociale au Québec). Il s’agit alors d’insisterparticulièrement sur la dimension procédurale de problématisation des enjeux au regard du recoursà la participation publique et à l’expertise scientifique. Les multiples acteurs de cette controversesont interrogés : les participants à la mobilisation sociale mais aussi les acteurs de l’industrie et desstructures politiques et administratives, afin de dresser la cartographie de leur position mais ausside leurs discours depuis les prémices de cette nouvelle activité industrielle d’exploration du gaz deschiste (2008) jusqu’aux derniers rebondissements politiques (2015). Cette recherche s’appuie surun corpus d’entretiens qualitatifs (40) mais aussi d’articles de presse écrite (2 400) ainsi que surl’analyse qualitative et quantitative des divers rapports et commissions de travail sur le gaz deschiste. / The analysis of the shale gas controversy in France and Quebec at an intermediate (meso)level stresses the social and political construction and dispute processes of the various framingssupported by contesting actors’ networks. “Interestment” dynamics both inside and outside publicpolicies show the multiple scenes and forums in which the controversy unfold. The analysis ofhow this public problem is built and its various redefinitions shows the core role of politicalframing of controversies. The solutions define as well as they reduce the risk related to this newindustry (a technological risk in France and a frame on social acceptability in Quebec). It is thenimportant to stress the procedural dimension of problematizing the stakes regarding publicparticipation and scientific expertise. This study questions the various actors of the controversy,those of social mobilization, the industry and the political and administrative structures, to mapboth their position and their discourses since the beginnings of the new industrial activity ofexploring for shale gas (2008) to the latest political developments (2015). This study is based on acorpus of qualitative interviews (40), press articles (2 400) and a qualitative and quantitativeanalysis of the various reports and committees on shale gas. Gaz de schiste Controverse Traduction Problème public Hydrocarbures non conventionnels Fracturation hydraulique Expertise Intéressement Comparaison Risque technologique Acceptabilité sociale Shale gas Controversy Translation Public problem Unconventional hydrocarbons Hydraulic fracturing Expertise Interestment Comparison Technological threat Social acceptability 320
142	A comparative study of income tax legislation for foreign oil and gas companies investing in Africa Struwig, Sybrand Johannes 19 July 2013 (has links) The oil and natural gas industry worldwide has become one of the most important commodities due to its value in use and dependency in our modern lifestyle. Countries with rich oil and natural gas reserves has shown to exploit these resources to the country's economic benefit. South Africa has in the past not been part of the big oil and natural gas producing countries of the world. But recent discoveries of possible shale gas reserves in the Karoo Basin attracted interest by foreign oil and gas companies with the potential that South Africa has as an oil and natural gas producing country. The purpose of this study is to compare the South African income tax law and regulations with that of the Republic of Equatorial Guinea, which arguable can be seen as one of the world's big oil and natural gas producing countries. The study firstly develops an understanding of each of the two countries' oil and natural gas industries and thereafter compares the two countries income tax laws, the income tax system and collection method of the income tax revenues. The study then concludes on the status of the South African income tax regime in comparison to the Republic of Equatorial Guinea's income tax regime. The introduction of the Tenth Schedule to the South African Income Tax Act (58/1962) has brought the income tax laws in South Africa in line with international practice. Consideration should be given to broadening the income tax revenue collection methods in order to broaden the tax base for South Africa. AFRIKAANS : Die olie en natuurlike gas industrie wêreldwyd het een van die mees belangrike kommoditeite geword as gevolg van die waarde en afhanklikheid wat dit het vir ons moderne leefstyl. Lande met ryk olie en natuurlike gas reserwes het bewys dat die gebruik daarvan tot voordeel van 'n land se ekonomiese groei kan lei. Suid-Afrika het in die verlede nie as een van die wêreld se reuse in olie en natuurlike gas produksie getel nie. Maar met die onlangse ontdekking van moontlike skalie gas reserwes in die Karoo Kom het belangstelling van buitelandse olie en gas maatskappye gelok in die potensiaal wat Suid-Afrika het om 'n olie en natuurlike gas produserende land te wees. Die doel van die studie is om 'n vergelyking te tref tussen Suid-Afrika se inkomste belasting wette en regulasies met die van die Republiek van Equatoriaal Guinea, wat gesien kan word as een van die reuse van die wêreld as dit kom by olie en natuurlike gas produserende lande. Die studie skets eerstens 'n agtergrond van die twee lande se olie en natuurlike gas industrieë en daarna vergelyk die studie die twee lande se inkomste belasting wette, die inkomste belasting stelsels en invorderings metodes van die inkomste belasting. Die studie kom dan tot 'n gevolgtrekking oor die status van die Suid-Afrikaanse inkomste belasting omgewing teenoor die Republiek van Equatoriaal Guinea se inkomste belasting omgewing. Die bekendstelling van die Tiende Skedule tot die Inkomste Belasting Wet (58/1962) het die Suid-Afrikaanse inkomste belasting wet in lyn gebring met internasionale inkomste belasinvorderings metodes van die inkomste belasting te verbreed om sodoende die belastingbasis te vergroot.ting wette. Oorweging moet geskenk word aan die invorderings metodes van die inkomste belasting te verbreed om sodoende die belastingbasis te vergroot. / Dissertation (MCom)--University of Pretoria, 2012. / Taxation / unrestricted Income tax Shale gas reserves Suid-afrika Olie en natuurlike gas industrieë Equatoriaal guinea Equatorial guinea Inkomstebelasting Skalie gas reserwes Natuurlike olie en gas Natural oil and gas Foreign oil and gas company UCTD
143	Controverses économiques et environnementales autour des hydrocarbures non conventionnels : les enseignements de la modélisation intégrée / Economic and environmental controversies over unconventional hydrocarbons : lessons from integrated modelling Leblanc, Florian 12 November 2018 (has links) Sous l’angle des controverses économiques et environnementales autour des hydrocarbures non conventionnels, cette thèse contribue au développement des outils de la modélisation intégrée sous deux aspects : leur capacité à représenter la dynamique de long terme des marchés de l’énergie ; la prise en compte des liens entre l’économie et la dynamique des différents gaz à effet de serre.Dans le premier cas, un jeu de simulations avec le modèle Imaclim-R met en évidence les impacts économiques du gaz et pétrole de schiste à travers (i) les liens entre trajectoires de crois-sance et inerties techniques ; (ii) la conditionnalité des gains de compétitivité des États-Unis aux stratégies implicites ou explicites de ce pays en matière de spécialisation internationale et de régime de change. Au détour de ces simulations nous étudions (α) les processus d’ajustement vers l’équilibre de long terme, en regardant les conditions d’obtention et de convergence des équilibres temporaires du modèle ; (β) les limites de tractabilitéd’une maquette stylisée du modèle reproduisant les mécanismes centraux.Dans le deuxième cas est traitée la question du rôle du méthane à court et long terme dans les stratégies climatiques. L’intégration du modèle réduit du système terrestre Oscar2.2 aumodèle Imaclim-R permet d’apprécier le rôle du méthane dans les coûts de l’atténuation et d’évaluer le risque d’émissions fugitives en tête de puits de gaz de schiste. Les simulations montrent que d’une part, l’avantage économique de la disponibilité en gaz de schiste peut être nuancé au regard du coût induit par ces émissions fugitives. D’autre part, les stratégies climatiques ambitieuses visant à limiter les augmentations de température bien en deçà de 2° voir 1.5°C nécessitent un contrôle plus immédiat des émissions de méthane. / From the perspective of economic and environmental controversies over unconventional oil and gas resources, this thesis contributes to the development of integrated modelling tools intwo aspects : their ability to reflect the long-term dynamics of energy markets ; and the consideration of the links between the economy and the dynamics of the various greenhouse gases.In the first case, a set of simulations with the Imaclim-R model highlights the economic impacts of shale gas and light tight oil through (i) the links between growth paths and technicalinertia ; (ii) the conditionality of US competitiveness gains on implicit or explained strategies ; and (iii) the conditionality of US competitiveness gains on this country implicit or explicit strategies in terms of international specialization and exchange rate regime. In the course of these simulations, we study (α) the adjustment processes towards the long-term equilibrium, looking at the conditions of existence and convergence of the model temporary equilibria ; (β) the tractability limits of a stylized model of Imaclim-R reproducing the main mechanisms.In the second case, the question of the role of methane in short and long term climate strategies is addressed. The integration of the Oscar2.2 Earth System model into the Imaclim-Rmodel is used to assess the role of methane in terms of mitigation costs and to assess the risk of emissions leakage at shale gas wellheads. The simulations show that, on the one hand, theeconomic advantage of shale gas availability can be balanced against the costs induced by these emissions leakage. On the other hand, the ambitous climate strategies aiming at limitingtemperature increases well below 2° or 1.5°C require a more instant control of methane. Gaz de Schiste Équilibre Général Calculable Compétitivité Modèles d’Évaluation Intégrée Atténuation du Changement Climatique Émissions Fugitives de Méthane Shale gas Computable General Equilibrium Competitiveness Integrated Assessment Modelling Climate Change Mitigation Methane Leakage Emissions
144	Evaluating Leachability of Residual Solids Generated from Unconventional Shale Gas Production Operations in Marcellus Shale Sharma, Shekar 17 September 2014 (has links) Hydraulic fracturing operations utilized for shale gas production result in the generation of a large volume of flowback and produced water that contain suspended material, salts, hydrocarbons, metals, chemical additives, and naturally-occurring radioactive material. The water is impounded at drilling sites or treated off-site, resulting in significant generation of residual solids. These are either buried on site or are disposed in lined landfills. The objective of this study was to determine the levels of heavy metals and other elements of concern that will leach from these residual solids when placed in typical disposal environments. For this purpose, laboratory leaching experiments were employed wherein representative samples were brought into contact with a liquid to determine the constituents that would be leached by the liquid and potentially released into the environment. The samples used included sludge resulting from the physicochemical treatment of process water (TS), sludge solidified with cement kiln dust (SS), raw solids obtained by gravity separation of process water (RS), and drilling mud (DM). The samples were subjected to both single extraction (i.e. Shake Extraction Test, SET) and multiple extraction (i.e. Immersion Test, IT) leaching tests. For the shake extraction test, samples were mixed with a specific amount of leaching solution without renewal over a short time period. In the immersion test, samples were immersed in a specific amount of leaching solution that was periodically renewed over a longer period of time. For both these tests, analyses were performed on the filtered eluate. The tests were performed as per standards with modifications. Distilled de-ionized water, synthetic acid rain (pH ~ 4.2), weak acetic acid (pH ~ 2.88), and synthetic landfill leachate were used as leaching solutions to mimic specific disposal environments. Alkali metals (Li, K, Na), alkaline earth metals (Ba, Ca, Mg, Sr) and a halide (Br), which are typically associated with Marcellus shale and produced waters, leached at high concentrations from most of the residual solids sample. The SS sample, due to its stabilization with CKD, had a lower extraction efficiency as compared to the unconsolidated TS and RS samples. In EF 2.9 and EF SLL, the leaching took place under acidic conditions, while for EF DDI and EF 4.2, the leaching occurred in alkaline conditions. EF 2.9 and EF SLL were determined to be the most aggressive leaching solutions, causing the maximum solubility of most inorganic elements. Thus, high amounts of most EOCs may leach from these residual solids in MSW landfills disposed under co-disposal conditions. Agitation, pH and composition of the leaching solution were determined to be important variables in evaluating the leaching potential of a sample. The results of this study should help with the design of further research experiments being undertaken to develop environmentally responsible management/disposal strategies for these residual solids and also prove useful for regulatory authorities in their efforts to develop specific guidelines for the disposal of residuals from shale gas production operations. / Master of Science hydraulic fracturing Marcellus shale residual solids hydraulic fracturing sludge produced water treatment by-products drilling mud leaching tests flow around immersion test shake extraction test
145	Evaluating Clay Mineralogy as a Thermal Maturity Indicator for Upper Devonian Black and Grey Shales and Siltstones within the Ohio Appalachian Basin Strong, Zachary M. January 2015 (has links) No description available. Geology Geophysics
146	Pressure Normalization of Production Rates Improves Forecasting Results Lacayo Ortiz, Juan Manuel 16 December 2013 (has links) New decline curve models have been developed to overcome the boundary-dominated flow assumption of the basic Arps’ models, which restricts their application in ultra-low permeability reservoirs exhibiting long-duration transient flow regimes. However, these new decline curve analysis (DCA) methods are still based only on production rate data, relying on the assumption of stable flowing pressure. Since this stabilized state is not reached rapidly in most cases, the applicability of these methods and the reliability of their solutions may be compromised. In addition, production performance predictions cannot be disassociated from the existing operation constraints under which production history was developed. On the other hand, DCA is often carried out without a proper identification of flow regimes. The arbitrary application of DCA models regardless of existing flow regimes may produce unrealistic production forecasts, because these models have been designed assuming specific flow regimes. The main purpose of this study was to evaluate the possible benefits provided by including flowing pressures in production decline analysis. As a result, it have been demonstrated that decline curve analysis based on pressure-normalized rates can be used as a reliable production forecasting technique suited to interpret unconventional wells in specific situations such as unstable operating conditions, limited availability of production data (short production history) and high-pressure, rate-restricted wells. In addition, pressure-normalized DCA techniques proved to have the special ability of dissociating the estimation of future production performance from the existing operation constraints under which production history was developed. On the other hand, it was also observed than more consistent and representative flow regime interpretations may be obtained as diagnostic plots are improved by including MBT, pseudovariables (for gas wells) and pressure-normalized rates. This means that misinterpretations may occur if diagnostic plots are not applied correctly. In general, an improved forecasting ability implies greater accuracy in the production performance forecasts and more reliable reserve estimations. The petroleum industry may become more confident in reserves estimates, which are the basis for the design of development plans, investment decisions, and valuation of companies’ assets. Flow regime identification boundary-dominated flow boundary dominated flow transient flow regime unconventional reservoirs rate transient analysis shale gas shale oil production forecasting reserves estimation hindcasting hindcasts low permeability tight sands high pressure rate controlled unstable flowing conditions.
147	Da revolução do gás não convencional nos EUA tendo como substrato uma interferência governamental persistente no estímulo a atividade econômica e no fomento as inovações tecnológicas afetas ao setor Valle, Arthur 13 January 2014 (has links) Submitted by ARTHUR VALLE (arthurvalle.f@gmail.com) on 2014-02-25T15:54:39Z No. of bitstreams: 1 ARTIGO SHALE FINAL (atual FGV-OS).pdf: 455344 bytes, checksum: 3be4fa41a18545524133c57cfb9e5de6 (MD5) / Rejected by ÁUREA CORRÊA DA FONSECA CORRÊA DA FONSECA (aurea.fonseca@fgv.br), reason: Prezado aluno, Substituir a folha de alterações nº 2 pela folha de aprovação com assinatura dos membros da banca e submeter novamente. ÁUREA SRA on 2014-02-26T13:41:40Z (GMT) / Submitted by ARTHUR VALLE (arthurvalle.f@gmail.com) on 2014-03-08T14:26:34Z No. of bitstreams: 1 ARTIGO SHALE FINAL (ENTREGUE - FGV).pdf: 600365 bytes, checksum: 3a72197ea83d5df9f9e396366e535e1e (MD5) / Approved for entry into archive by ÁUREA CORRÊA DA FONSECA CORRÊA DA FONSECA (aurea.fonseca@fgv.br) on 2014-04-04T17:04:35Z (GMT) No. of bitstreams: 1 ARTIGO SHALE FINAL (ENTREGUE - FGV).pdf: 600365 bytes, checksum: 3a72197ea83d5df9f9e396366e535e1e (MD5) / Approved for entry into archive by Marcia Bacha (marcia.bacha@fgv.br) on 2014-04-09T13:43:33Z (GMT) No. of bitstreams: 1 ARTIGO SHALE FINAL (ENTREGUE - FGV).pdf: 600365 bytes, checksum: 3a72197ea83d5df9f9e396366e535e1e (MD5) / Made available in DSpace on 2014-04-09T14:52:02Z (GMT). No. of bitstreams: 1 ARTIGO SHALE FINAL (ENTREGUE - FGV).pdf: 600365 bytes, checksum: 3a72197ea83d5df9f9e396366e535e1e (MD5) Previous issue date: 2014-01-13 / O presente estudo versa sobre os fatores tecnológicos e ambientais que vêm resultando no crescimento da produção de gás natural não convencional nos EUA. Os objetos de analise principais serão as políticas públicas, assim como a dinâmica entre os atores sociais e o ambiente propício que fora criado para que houvesse o adensamento do fomento e do estímulo às inovações tecnológicas sucedidas no setor. / The present study deals with the technological and environmental factors that have resulted in increased of production of unconventional natural gas in the U.S.. The objects of analysis will be the public policies, as well as the dynamics between social actors and enabling environment which was created to promote and the encourage the successful technological innovations in the industry. Gás de Xisto Gás Não Convencional Fraturamento Hidráulico Perfuração horizontal Revolução do gás Mapeamento microssísmico Inovação Políticas públicas Shale gas Unconventional gas Hydraulic Fracturing Horizontal Drilling Gas Revolution Microssísmic mapping Innovation Public policy Administração de empresas Gás de xisto Fraturamento hidráulico Inovações tecnológicas Políticas públicas
148	Study of organic matter decomposition under geological conditions from replica exchange molecular dynamics simulations / Etude de la décomposition de matière organique dans des conditions géologiques par simulations numériques de replica exchange molecular dynamics Atmani, Léa 15 May 2017 (has links) Pétrole et gaz proviennent de la décomposition de la matière organique dans la croûte terrestre. En s’enfouissant, les résidus organiques se décomposent en un solide poreux et carboné, appelé kérogène et en un fluide composé d’hydrocarbures et de petites molécules telles que de l’eau. Le processus de formation du kérogène n’est pas totalement élucidé et une modélisation aiderait à une meilleure compréhension à la fois de sa structure et de sa composition et serait utile à l’industrie pétrolière.Dans le présent travail, nous adoptons une approche thermodynamique ayant pour but, à l’aide de simulations numériques, de d’étudier la décomposition de précurseurs de kérogène d’un type donné –ici le type III- dans les conditions d’un réservoir géologique. La méthode dite de Replica Exchange Molecular Dynamics (REMD) est appliquée pour étudier la décomposition de cristaux de cellulose et de lignine. Le potentiel d’interaction ReaxFF et le code LAMMPS sont utilisés. La REMD est une façon de surmonter de larges barrières d’énergie libre, en améliorant l’échantillonnage de configurations d’une dynamique moléculaire conventionnelle à température constante, en utilisant des états générés à températures supérieures.En fin de simulation, les systèmes ont atteint un état d’équilibre entre deux phases : une phase riche en carbone, composée d’amas de macromolécules, que nous appelons « solide » et d’une phase riche en oxygène et en hydrogène, composée de petites molécules, que nous dénommons « fluide ». L’évolution des parties solides de nos systèmes coïncide avec celle d’échantillons naturels de kérogènes de type III. / In deep underground, organic residues decompose into a carbonaceous porous solid, called kerogen and a fluid usually composed of hydrocarbons and other small molecules such as water, carbon monoxide. The formation process of the kerogen remains poorly understood. Modeling its geological maturation could widen the understanding of both structure and composition of kerogen, and could be useful to oil and gas industry.In this work we adopt a purely thermodynamic approach in which we aim, through molecular simulations, at determining the thermodynamic equilibrium corresponding to the decomposition of given organic precursors of a specific type of kerogen –namely type III- under reservoir conditions. Starting from cellulose and lignin crystal structures we use replica exchange molecular dynamics (REMD) simulations, using the reactive force field ReaxFF and the open-source code LAMMPS. The REMD method is a way ofovercoming large free energy barriers, by enhancing the configurational sampling of a conventional constant temperature MD using states from higher temperatures.At the end of the simulations, we have reached for both systems, a stage where they can clearly be cast into two phases: a carbon-rich phase made of large molecular clusters that we call here the "solid" phase, and a oxygen and hydrogen rich phase made of small molecules that we call "fluid" phase.The evolution of solid parts for both systems and the natural evolution of a type III kerogen clearly match. Evolution of our systems follows the one of natural samples, as well as the one of a type III kerogen submitted to an experimental confined pyrolysis. Kérogène Remd Simulations Gaz Pétrole Gaz de schistes Matière organique Lammps ReaxFF Cellulose Lignine Van Krevelen Hydrocarbures Simulations Numériques Carbone Potentiel réactif Carbone amorphe Thermodynamique Géologie Roche mère Maturation Dynamique Moléculaire Pyrolyse Kerogen Remd Replica Exchange Molecular Dynamics Gas Shale Gas Oil Organic Matter Lammps ReaxFF Cellulose Lignin Van Krevelen Pyrolysis Hydrocarbons Numerical simulations Carbon Reactive Potential Amorphous Carbon Thermodynamics Petroleum Geology Source rocks Maturation Molecular Dynamics 530
149	Processes for Light Alkane Cracking to Olefins Peter Oladipupo (8669685) 12 October 2021 (has links) <p>The present work is focused on the synthesis of small-scale (modular processes) to produce olefins from light alkane resources in shale gas.</p> <p>Olefins, which are widely used to produce important chemicals and everyday consumer products, can be produced from light alkanes - ethane, propane, butanes etc. Shale gas is comprised of light alkanes in significant proportion; and is available in abundance. Meanwhile, shale gas wells are small sized in nature and are distributed over many different areas or regions. In this regard, using shale gas as raw material for olefin production would require expensive transportation infrastructure to move the gas from the wells or local gas gathering stations to large central processing facilities. This is because existing technologies for natural gas conversions are particularly suited for large-scale processing. One possible way to take advantage of the abundance of shale resource for olefins production is to place small-sized or modular processing plants at the well sites or local gas gathering stations.</p> <p>In this work, new process concepts are synthesized and studied towards developing simple technologies for on-site and modular processing of light alkane resources in shale gas for olefin production. Replacing steam with methane as diluent in conventional thermal cracking processes is proposed to eliminate front-end separation of methane from the shale gas processing scheme. Results from modeling studies showed that this is a promising approach. To eliminate the huge firebox volume associated with thermal cracking furnaces and allow for a compact cracking reactor system, the use of electricity to supply heat to the cracking reactor is considered. Synthesis efforts led to the development of two electrically powered reactor configurations that have improved energy efficiency and reduced carbon footprints over and compare to conventional thermal cracking furnace configurations.</p> <p>The ideas and results in the present work are radical in nature and could lead to a transformation in the utilization of light alkanes, natural gas and shale resources for the commercial production of fuels and chemicals.</p> Chemical Engineering Design Light Alkane Cracking Olefin Production Thermal Cracking Electrical Reactor Shale Gas Processing Natural Gas Processing Alkane Dehydrogenation Methane Ethane Cracking Methane as a Diluent Electrical Dehydrogenation Electrified Cracking Process Process Intensification Modularization Modular Process Small-Scale Chemical Process Light Gas Pyrolysis Alkane Pyrolysis Ethane Pyrolysis Ethane Cracking Ethane Dehydrogenation Ethylene Production

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