Tenacidade ao impacto e resistência a fadiga de aço API 5L X70 modificado ao Nb

O transporte de gás e derivados de petróleo é realizado pelo uso de tubulações, denominadas de oleodutos ou gasodutos, que necessitam de elevados níveis de resistência mecânica e corrosão, aliadas a uma boa tenacidade à fratura e resistência à fadiga. A adição de elementos de liga nesses aços, Ti, V e Nb entre outros, é realizada para o atendimento destes níveis de resistência após o processamento termomecânico das chapas para fabricação destes dutos, utilizando-se a norma API 5L do American Petroleum Institute, API, para a classificação destes aços. A adição de elementos de liga em associação com o processamento termomecânico visa o refino de grão da microestrutura austenítica, o qual é transferido para a estrutura ferrítica resultante. O Brasil é o detentor das maiores reservas mundiais de nióbio, que tem sido apresentado como refinador da microestrutura mais eficiente que outros elementos, como o V e Ti. Neste trabalho dois aços, denominados Normal e Alto Nb foram estudados. A norma API propõe que a soma das concentrações de Nióbio, Vanádio e Titânio devem ser menores que 0,15% no aço. As concentrações no aço contendo mais alto Nb é de 0,107%, contra 0,082% do aço de composição normal, ou seja, ambos atendem o valor especificado pela norma API. Entretanto, os aços são destinados ao uso em dutovias pela PETROBRÁS que impõe limites nos elementos microligantes para os aços aplicados em dutovias. Deste modo estudos foram desenvolvidos para verificar se os parâmetros de resistência à tração, ductilidade, tenacidade ao impacto e resistência à propagação de trinca por fadiga, estariam em acordo com a norma API 5L grau X70 e com os resultados que outros pesquisadores têm encontrado para aços dessa classe. Ainda, como para a formação de uma dutovia os tubos são unidos uns aos outros por processo de soldagem (circunferencial), o estudo de fadiga foi estendido para as regiões da solda e zona termicamente afetada (ZTA). Como conclusão final observa-se que o aço API 5L X70 com Nb modificado, produzido conforme processo desenvolvido pela ArcelorMittal - Tubarão, apresenta os parâmetros de resistência e ductilidade em tração, resistência ao impacto e resistência a propagação de trinca em fadiga (PTF) similar aos aços API 5L X70 com teores de Nb = 0,06 % peso e aqueles da literatura com teores de Nb+Ti+V < 0,15% peso. O metal base, metal de solda e zona termicamente afetada apresentaram curvas da/dN x ΔK similares, com os parâmetros do material C e m, da equação de Paris, respectivamente na faixa de 3,3 - 4,2 e 1.3x10-10 - 5.0x10-10 [(mm/ciclo)/(MPa.m1/2)m].

Gasification and pyrolysis of Posidonia oceanica in the presence of dolomite

In the present work, a very detailed study of the reforming of syngas produced in the decomposition of Posidonia oceanica is done. The effect of the presence of different amounts of dolomite is analyzed. Also pyrolysis is studied, in nitrogen atmosphere, and gasification in the presence of air, oxygen and different amounts of steam. A detailed discussion on formation and destruction of tars is done. Furthermore, the effect of the heating rate in the decomposition and the residence time of the evolved gases are discussed. Syngas with ratio H2/CO from 0.3 to ca. 3 can be obtained from this interesting material. Marine species (microalgae) are usually studied with the aim of cultivating them for gas or oil production, but in this paper we draw attention to the possibility of using a natural resource with a very small impact in the ecosystem.

Gasification and Pyrolysis of Posidonia oceanica in the Presence of Dolomite

Resumen del póster presentado en Symposium on Renewable Energy and Products from Biomass and Waste, CIUDEN (Cubillos de Sil, León, Spain), 12-13 May 2015

X lberoamerican Conference on Phase Equilibria and Fluid Properties for Process Design (EQUIFASE): June 28-July 1, 2015 - Alicante (Spain): Book of Abstracts

The general purpose of the EQUIFASE Conference is to promote the Scientific and Technologic exchange between people from both the academic and the industrial environment in the field of Phase Equilibria and Thermodynamic Properties for the Design of Chemical Processes. Topics: Measurement of Thermodynamic Properties. Phase Equilibria and Chemical Equilibria. Theory and Modelling. Alternative Solvents. Supercritical Fluids. Ionic Liquids. Energy. Gas and oil. Petrochemicals. Environment and sustainability. Biomolecules and Biotechnology. Product and Process Design. Databases and Software. Education.

Geopolitical shifts in the Eastern Mediterranean. Security Policy Brief No. 43, February 2013

Three major geopolitical events are putting the stability of the Eastern Mediterranean at risk. Most of the region is in a deep monetary and economic crisis. The Arab Spring is causing turmoil in the Levant and the Maghreb. Gas and oil discoveries, if not well managed, could further destabilise the region. At the same time, Russia and Turkey are staging a comeback. In the face of these challenges, the EU approaches the Greek sovereign debt crisis nearly exclusively from a financial and economic viewpoint. This brief argues that the EU has to develop a comprehensive strategy for the region, complementing its existing multilateral regional framework with bilateral agreements in order to secure its interests in the Eastern Mediterranean.

Pool it, share it, use it: the European Council on defence. Security Policy Brief No. 44, March 2013

Three major geopolitical events are putting the stability of the Eastern Mediterranean at risk. Most of the region is in a deep monetary and economic crisis. The Arab Spring is causing turmoil in the Levant and the Maghreb. Gas and oil discoveries, if not well managed, could further destabilise the region. At the same time, Russia and Turkey are staging a comeback. In the face of these challenges, the EU approaches the Greek sovereign debt crisis nearly exclusively from a financial and economic viewpoint. This brief argues that the EU has to develop a comprehensive strategy for the region, complementing its existing multilateral regional framework with bilateral agreements in order to secure its interests in the Eastern Mediterranean.

Abkhazia, South Ossetia, Nagorno-Karabakh: unfrozen conflicts between Russia and the West. OSW Special Report, 9 July 2008

The Southern Caucasus is the site of three armed conflicts with separatist backgrounds, which have remained unsolved for years: the conflicts in Georgia's Abkhazia and South Ossetia, and Azerbaijan's conflict over Nagorno-Karabakh (including the areas around Nagorno-Karabakh which were seized by Armenian separatists in the course of the war). Neither Georgia nor Azerbaijan have had any control over the disputed areas since the early 1990s. Both states are simultaneously in conflict with the separatists' informal patrons, respectively Russia and Armenia. After over a decade of relative peace during which the conflicts remained frozen, tension has recently risen considerably: in the case of Abkhazia and South Ossetia, large-scale fighting may break out in the coming months, whereas in the case of Nagorno-Karabakh and the Azeri-Armenian conflict, such a threat may materialise within the next five years. The current formula for politically resolving the conflicts is ineffective and close to exhaustion, and the prospect of any alternative peace plans being developed is rather distant. The conflicts in the Southern Caucasus are of increasing concern to the West, mainly because of the Western actors' constantly growing political and economic involvement in Georgia and Azerbaijan (including support for reforms and development of the gas and oil transmission infrastructures), as well as its less intensive commitments in Armenia. An outbreak of open fighting over the separatist regions would destabilise the Southern Caucasus, largely undoing the results of the actions which the EU, NATO and the USA have taken in the region in recent years. Moreover, the situation in the Southern Caucasus, especially the separatisms themselves, have in fact become an element in the wider geopolitical game between the West and Russia. For Russia, the stakes are maintaining its influence in the region, and for the West, demonstrating its ability to effectively promote democracy and economic modernisation in the countries bordering it.

Turcja - korytarz transzytowy dla surocow energetycznych do UE? Prace OSW 17/2005. = Turkey - an energy transit corridor to the EU? OSW Study 17/2005

1. The priority of Ankara's energy policy is to make Turkey an important transit corridor for energy resources transported to the EU. Turkey wishes to play an active role in the distribution and sale of gas and oil flowing across its territory. 2. Transit and sale of energy resources, and gas in particular, are expected to provide a major source of income for Turkey and a tool by which Ankara will be able to build its position in the region and in Europe. 3. Since Turkey is an EU candidate country, Brussels will probably welcome Turkey's role as a transit corridor as much as Ankara will. 4. The success of Ankara's energy strategy hinges on developments in Turkey's internal energy market. 5. It also depends on a number of external factors including: - Export policies and internal situation in producer countries. Most importantly, it depends on: a. Russia and its energy policy priorities b. Stability in the Middle East. - Policies of consumer countries, including the EU in particular. - Policies of world powers present in the region (USA).

Trudny "Sojusznik" Bialorus w polityce Rosji. Prace OSW 2008. = Difficult "ally." Belarus in Russia's foreign policy. OSW Study 28/2008

Belarus holds a special position in Russian policy due to its geopolitical, military and transit significance. Russia's influence and position in the entire Eastern European region largely depend on how strong Russian influence in Belarus is. The process of Russian-Belarusian integration began in 1994, when Alyaksandr Lukashenka came to power in Minsk. At the time, Russia's policy towards Belarus was based on twomain assumptions. Firstly, the Kremlin supported Lukashenka's authoritarian regime. This allowed Russia to keep Belarus within its orbit of political influence and prevent other states from getting involved, since an undemocratic Belarus could not count on closer contacts with the West. Secondly, Russia heavily subsidised Belarus with cheap energy resources (way below the market price) and allowed the duty-free access of Belarusian goods to its market. Thus Belarus became a kind of 'sponsored authoritarianism' with a specific economic model, owing its existence to Russia's economic and political support. At the same time, Moscow's key objective in its policy towards Belarus was to make Minsk accept the Russian conditions concerning integration, which would in fact lead to Belarus' incorporation by the Russian Federation. However, Belarus managed to maintain its sovereignty, while Alyaksandr Lukashenka bandied the term 'integration' about in order to maintain the preferential model of his state's relations with Russia. Russia's intention to alter the nature of these bilateral relations became evident when Vladimir Putin took power in 2000. However, Moscow faced Minsk's refusal to accept the Russian integration plan (which, among other measures, provided for the takeover of Belarusian economic assets by Russian companies). This forced Russia to use its main tool against Minsk: the supplies of cheap gas and oil that had been sustaining Belarus' archaic economy. The most serious crisis in Russian-Belarusian relations broke out at the beginning of 2007, following Moscow's decision to raise the energy resource prices. This decision marked the beginning of the application of market principles to settlements between Moscow and Minsk. The key question this study is meant to answer concerns the consequences of the aforementioned decision by Russia for future Russian-Belarusian relations. Are they at a turning point? What are Russia's policy objectives? What results can come from the process of moving mutual relations onto an economic footing? What policy will replace Russia's 'sponsoring of Belarusian authoritarianism', which it has been implementing since 1994? Finally, what further measures will Russia undertake towards Belarus? The current study consists of five chapters. The first chapter offers a brief presentation of Belarus' significance and position in Russian policy. The second analyses the development of Russian-Belarusian political relations, first of all the establishment of the Union State, Belarus' position in Russian domestic policy and Russia's influence on Belarusian policy. The third chapter presents bilateral economic relations, primarily energy issues. The fourth chapter describes the state and perspectives of military cooperation between the two states. The fifth chapter presents conclusions, where the author attempts to define the essence of the ongoing re-evaluation in Russian-Belarusian relations and to project their future model.

The Great Game around Turkmenistan. OSW Point of View, August 2008

The rise of a new leader of the state of Turkmenistan – President Gurbanguly Berdymukhammedov, who became ruler of the central Asian state after the 21-year rule of Saparmurad Niyazov, the self-proclaimed Turkmenbashi, who died on December 21, 2006 – has initiated changes in Turkmenistan’s political life. The new president has broken with the previous policy of self-isolation, and has directed the country towards openness to the outside world. Opportunities have thereby arisen for competitors in the ‘Great Game’, to gain political influence in Turkmenistan and access to hitherto unexploited Turkmen deposits of gas and oil. A new stage in the Great Game, which has been played for influence in Central Asia and control of access to its energy resources for many years, can thus be said to have been launched, and Turkmenistan has become the main setting for it. The major actors involved are Russia, the United States, China and the European Union.

Proposed Gulf of Alaska/Cook Inlet lease sale 88 : final environmental impact statement /

Item 603-G

EEC energy policy and the UK:the Birmingham energy model

This paper examines the implications of the EEC common energy policy for the UK energy sector as represented by a long-term programming model. The model suggests that the UK will be a substantial net exporter of energy in 1985 and will therefore make an important contribution towards the EEC's efforts to meet its import dependency target of 50% or less of gross inland consumption. Furthermore, the UK energy sector could operate within the 1985 EEC energy policy constraints with relatively low extra cost up to the year 2020 (the end of the period covered by the model). The main effect of the constraints would be to bring forward the production of synthetic gas and oil from coal.

Dunn County and Watford City, North Dakota: A case study of the fiscal effects of Bakken shale development

The Bakken region of North Dakota and Montana has experienced perhaps the greatest effects of increased oil and gas development in the United States, with major implications for local governments. Though development of the Bakken began in the early 2000s, large-scale drilling and population growth dramatically affected the region from roughly 2008 through today. This case study examines the local government fiscal benefits and challenges experienced by Dunn County and Watford City, which lie near the heart of the producing region. For both local governments, the initial growth phase presented major fiscal challenges due to rapidly expanding service demands and insufficient revenue. In the following years, these challenges eased as demand for services slowed due to declining industry activity and state tax policies redirected more funds to localities. Looking forward, both local governments describe their fiscal health as stronger because of the Bakken boom, though higher debt loads and an economy heavily dependent on the volatile oil and gas industry each pose challenges for future fiscal stability.

Geochemical composition of ODP Site 210-1276 shales

During Ocean Drilling Program Leg 210, a greatly expanded sedimentary sequence of continuous Cretaceous black shales was recovered at Site 1276. This section corresponds to the Hatteras Formation, which has been documented widely in the North Atlantic Ocean. The cored sequence extends from the lowermost Albian, or possibly uppermost Aptian, to the Cenomanian/Turonian boundary and is characterized by numerous gravity-flow deposits and sporadic, finely laminated black shales. The sequence also includes several sedimentary intervals with high total organic carbon (TOC) contents, in several instances of probable marine origin that may record oceanic anoxic events (OAE). These layers might correspond to the Cenomanian-Turonian OAE 2; the mid-Cenomanian event; and OAE 1b, 1c, and 1d in the Albian. In addition, another interval with geochemical characteristics similar to OAE-type layers was recognized in the Albian, although it does not correspond to any of the known OAEs. This study investigates the origin of the organic matter contained within these black shale intervals using TOC and CaCO3 contents, Corg/Ntot ratios, organic carbon and nitrogen isotopes, trace metal composition, and rock-eval analyses. Most of these black shale intervals, especially OAE 2 and 1b, are characterized by low 15N values (<0) commonly observed in mid-Cretaceous black shales, which seem to reflect the presence of an altered nitrogen cycle with rates of nitrogen fixation significantly higher than in the modern ocean.

Sustentabilidade das empresas associadas à REDEPETRO-RN

The present study investigated the management of social, environmental and economic sustainability practices employed by 72 oil companies in Rio Grande do Norte state in Brazil associated to Joint Business Network for Enhancing the Competitive Ability of Suppliers of Goods and Services to the Gas and Oil Industry in Rio Grande do Norte (REDEPETRO-RN). Thus, our investigation aimed to determine the extent to which sustainability practices of companies associated to REDEPETRO-RN are developed through their own efforts or influenced by the Triple Helix interorganizational arrangement (governamental organizations, education and research institutions, and industries). The research instrument used was a questionnaire in order to map and characterize the sustainability practices. The research subjects were business owners and managers. The data collected supported the descriptive, correspondence and correlation analyzes. Were identified a greater emphasis of the companies surveyed in developing sustainability practices and greater economic influence of business organizations in the construction of sustainability status. It was concluded with confirmation of thesis of the REDEPETRO-RN arrangement exhibits the characteristics and functioning of a common Interorganizational Cooperative Arrangement, not those of a triple helix interorganizational arrangement, given that the influences exerted for the development of social, environmental and economical sustainability on the part of teaching and research institutions, and government and business organizations do not interact with one another sufficiently to create a virtuous circle of cooperation among the associated companies. By contrast, the Interorganizational Cooperative Arrangement plays an important role in strengthening the competitiveness of companies affiliated to REDEPETRO-RN, by combining different competencies in an attempt at supporting the adoption of sustainability practices, a role reinforced by the scope of PETROBRAS, which, due to its economic importance, has considerable weight in the managerial decisions of associated companies