Design Optimization of Top-Tensioned Risers for Deepwater HPHT Applications: Part 1

2010 ◽  
Author(s):  
Lixin Xu ◽  
Paul Stanton
Keyword(s):  
High Pressure ◽  
Performance Optimization ◽  
Oil And Gas ◽  
Production Systems ◽  
High Strength ◽  
Environmental Loads ◽  
Steel Pipes ◽  
Design Concepts ◽  
Wide Range ◽  
The Impact

Dry-tree solutions with top-tensioned risers (TTRs) have been successfully used with floating production systems (FPS), such as Spars and TLPs, in a wide range of deepwater applications. Both single-casing and dual-casing top-tensioned risers are field-proven in existing field developments. The top-tensioned risers bring technical advantages and operational cost benefits. However, recent oil and gas developments that have high pressure and high temperature (HPHT) in combination with severe environmental loads push the design limits of conventional steel pipes in deepwater risers. High-strength steel pipes are therefore considered for risers for both technical and economic reasons. This paper discusses the impact of the above requirements on design of top-tensioned risers, and proposes feasible design concepts for top tensioned risers with extremely high pressure requirements. Part I of the topic here addresses strategies of top-tensioned riser sizing and weight management, and design considerations for TTR specialty joints. Part II of this topic will follow for top-tensioned riser tensioning system configuration and tension performance optimization, as well as coupled motion compensation on the host platform. The objective of the study that forms the basis for this paper is to provide top-tensioned riser system configurations that meet the challenges of the extremely high operational pressure and environmental loads in deep and ultra-deep waters.

Design Optimization of Top-Tensioned Risers for Deepwater HPHT Applications: Part II

2011 ◽  
Author(s):  
Lixin Xu
Keyword(s):  
Performance Optimization ◽  
Oil And Gas ◽  
Production Systems ◽  
High Strength ◽  
Environmental Loads ◽  
Steel Pipes ◽  
Deep Waters ◽  
Wide Range ◽  
System Configurations ◽  
The Impact

Dry-tree solutions with top-tensioned risers (TTRs) have been successfully used with floating production systems (FPS), such as Spars and TLPs, in a wide range of deepwater applications. Both single-casing and dual-casing top-tensioned risers are field-proven in existing field developments. The top-tensioned risers can bring technical advantages and operational cost benefits. Moreover, recent oil and gas developments that have high pressure and high temperature (HPHT) in combination with severe environmental loads lead to more design challenges for steel risers in deepwater, pushing the design limits of conventional steel pipes in deepwater risers. High-strength steel pipes are therefore considered for both technical and economic reasons. The objective of the study that forms the basis for this paper is to provide top-tensioned riser system configurations that meet challenges of the extremely high operational pressure and environmental loads in deep and ultra-deep waters. Part I of the paper was published in OMAE 2010 [1], addressing strategies for top-tensioned riser sizing and weight management for HPHT applications in deep and ultra-deep waters, and also design considerations for TTR specialty joints. Part II here present spar top-tensioned risers and their support tensioning systems. The paper illustrates the HPHT riser global configuration on spar and the tensioning system performance optimization, as well as coupled motion compensation with the spar platform. The impact of riser loads on spar global performance is also discussed.

Study the effect of casting temperature on details from thermo-plastic materials

2020 ◽  
pp. 42-45
Author(s):  
J.A. Kerimov ◽  
Keyword(s):  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Mold Temperature ◽  
Quality Parameters ◽  
Oil Field ◽  
Casting Temperature ◽  
Gas Industry ◽  
Field Equipment ◽  
Wide Range ◽  
The Impact

The implementation of plastic details in various constructions enables to reduce the prime cost and labor intensity of machine and device manufacturing, decrease the weight of design and improve their quality and reliability at the same time. The studies were carried out with the aim of labor productivity increase and substitution of colored and black metals with plastic masses. For this purpose, the details with certain characteristics were selected for further implementation of developed technological process in oil-gas industry. The paper investigates the impact of cylinder and compression mold temperature on the quality parameters (shrinkage and hardness) of plastic details in oil-field equipment. The accessible boundaries of quality indicators of the details operated in the equipment of exploration, drilling and exploitation of oil and gas industry are studied in a wide range of mode parameters. The mathematic dependences between quality parameters (shrinkage and hardness) of the details on casting temperature are specified.

A New World Economic order formation

2021 ◽  
pp. 932-950
Author(s):  
Vladislav Vyacheslavovich Emelyanov
Keyword(s):  
Oil And Gas ◽  
World Order ◽  
The United States ◽  
New Order ◽  
The West ◽  
Wide Range ◽  
The World ◽  
The Usa ◽  
World Economic Order ◽  
The Impact

Every few decades, the world order changes due to various geopolitical, economic and other circumstances. For example, as a result of globalization, the world order has undergone significant changes in the last forty years. Globalization has led to the destruction of the postwar world order, as well as to world leadership by the United States and the West. However, in recent decades, as a result of globalization, the U.S. and the West began to cede their leadership to developing countries, so there is now a change in the economic structure of relations in the world system. Today the center of economic growth is in the East, namely in Asia. There are no new superpowers in the world at the moment, but the unipolar world will cease to exist due to the weakening of the U. S. leadership, which will lead to a change in the world order. A new leader, which may replace the U. S., will not have as wide range of advantages as the USA has. Most likely, the essence of the new order will be to unite the largest countries and alliances into blocks, for example, the USA together with the Trans-Pacific Partnership, the EU, etc. The article outlines forecasts of GDP growth rates as well as the global energy outlook; analyzes the LNG market as well as the impact of the pandemic on the global oil and gas market; and lists the characteristics of U. S. geopolitics.

Natural resource governance, accountability and legitimising propensity: insights from Ghana's oil and gas sector

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Emmanuel Asare ◽  
Bruce Burton ◽  
Theresa Dunne
Keyword(s):  
Natural Resource ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Resource Discovery ◽  
Legitimacy Theory ◽  
Structured Interviews ◽  
Content Type ◽  
Resource Governance ◽  
Wide Range ◽  
The Impact

PurposeThis study explores Ghanaian views about accountability discharge by firms and government in the context of the nation's newly discovered oil and gas resources. The research focusses on a range of issues relating to stakeholder interaction, communication flows and the impact of decision-making on Ghanaian lives, as perceived by individuals on the ground.Design/methodology/approachThe paper adapts elements of legitimacy theory to interpret the outcome of a series of semi-structured interviews with members of key accountee and accountor groups including citizens and representatives of the state and private firms in the oil and gas industry in Ghana.FindingsThe results indicate that rather than attempting to effect substantive accountability discharge, Ghana's government and oil and gas firms employ a wide range of legitimation strategies despite the apparently complete absence of the accountee power normally seen as driving the need for social contract repair.Research limitations/implicationsThe findings suggest that accountability discharge in Ghana is cursory at best, with several legitimising strategies in evidence. The representatives from state institutions appear to share some of the concerns, suggesting that the problems are entrenched and will require robust enforcement of a strengthened regulatory approach to effect meaningful change.Originality/valueThis paper contributes to the literature on the discharge of institutional accountability by building on earlier conceptualisations of legitimacy theory to explore perceptions around a recent natural resource discovery. The analysis highlights grave concerns regarding the behaviour of state and corporate actors, one that runs counter to sub-Saharan African tradition.

The ethical basis of intensive livestock production systems

2001 ◽  
Vol 2001 ◽  
pp. 266-266
Author(s):  
G. Gatward
Keyword(s):  
Animal Welfare ◽  
Animal Rights ◽  
Ethical Issues ◽  
Production Systems ◽  
Livestock Production ◽  
Animal Rights Movement ◽  
Ethical Implications ◽  
Wide Range ◽  
The 1960S ◽  
The Impact

Many of the ethical issues regarding the livestock production systems of the late twentieth century have concentrated on the process of intensification. The extent of public disquiet at the welfare and ethical implications of intensification has been reflected in the burgeoning membership of animal welfare and animal rights organisations. The reasons for this increase as well as the impact that it has had on the livestock industry can be traced back to the 1960s, to factors such as the growing urbanisation of the population and especially the emergence of the animal rights movement which focused attention on a wide range of issues including the human exploitation of other animal species. This in turn led to a demarcation between those who supported the animal welfare cause and those who argued for animal rights.

Numerical Prediction of MODUs Drift During Hurricane Katrina

2007 ◽  
Author(s):  
Galin Tahchiev ◽  
Jun Zhang
Keyword(s):  
Hurricane Katrina ◽  
Oil And Gas ◽  
Production Systems ◽  
Steady Motion ◽  
The Body ◽  
Wave Forces ◽  
Simplified Approach ◽  
Wave Drift Damping ◽  
Offshore Oil And Gas ◽  
The Impact

During severe hurricanes, such as Katrina, the mooring system of a number of Mobile Offshore Drilling Units (MODUs) in the Gulf of Mexico failed. Drifting MODUs may potentially damage other critical elements of the offshore oil and gas infrastructure by colliding with floating or fixed production systems and transportation hubs, or by rupturing pipelines owing to their dragging anchors over the seabed. To avoid or mitigate the damage caused by a drifted MODU, it is desirable to understand the mechanics of the drift of a MODU under the impact of severe wind, wave and current and have the capability of predicting the trajectory of the drift. To explore the feasibility and accuracy of predicting the trajectory of a drifting MODU based on real-time or hindcast met-ocean conditions and limited knowledge of the condition of the drifting MODU, this study employed a simplified equation describing only the horizontal (surge, sway and yaw) motions of a MODU under the impact of steady wind, current and wave forces. The simplified hydrodynamic model neglects the first- and second-order oscillatory wave forces, unsteady wind forces (owing to wind gustiness), wave drift damping, and the effects of the body oscillation on the steady wind and current forces. It was assumed that the net effects of the oscillatory forces on the steady motion are insignificant. To verify the accuracy and feasibility of our simplified approach, the predicted drifts of two MODUs were compared with the corresponding measured trajectories recorded by the Global Positioning System (GPS).

The ethical basis of intensive livestock production systems

2002 ◽  
Vol 2002 ◽  
pp. 245-245
Author(s):  
G. Gatward
Keyword(s):  
Animal Welfare ◽  
Animal Rights ◽  
Ethical Issues ◽  
Production Systems ◽  
Livestock Production ◽  
Animal Rights Movement ◽  
Ethical Implications ◽  
Wide Range ◽  
The 1960S ◽  
The Impact

Many of the ethical issues regarding the livestock production systems of the late twentieth century have concentrated on the process of intensification. The extent of public disquiet at the welfare and ethical implications of intensification has been reflected in the burgeoning membership of animal welfare and animal rights organisations. The reasons for this increase as well as the impact that it has had on the livestock industry can be traced back to the 1960s, to factors such as the growing urbanisation of the population and especially the emergence of the animal rights movement which focused attention on a wide range of issues including the human exploitation of other animal species. This in turn led to a demarcation between those who supported the animal welfare cause and those who argued for animal rights.

Pressure capacity of sandwich pipe with cement-based core configuration under deep-water external pressure

2020 ◽  
Vol 22 (4) ◽  
pp. 1292-1326
Author(s):  
Feng Wan ◽  
Feng Guan ◽  
Chuanxi Zhou ◽  
Shaohu Liu ◽  
Ting Yang
Keyword(s):  
Deep Water ◽  
Oil And Gas ◽  
Core Layer ◽  
External Pressure ◽  
Fiber Reinforced ◽  
Shear Strength Test ◽  
Steel Pipes ◽  
Wide Range ◽  
Parametric Studies ◽  
Value Decomposition

Sandwich pipe, consisting of two steel tubes and a polymeric or cement-based material core layer, has been considered as an attractive solution for oil and gas transporting in deep water. In this paper, the characteristic responses and pressure capacity of sandwich pipes having fiber-reinforced cementitious composites core configuration under external hydrostatic pressure were investigated. The interface adhesion behavior between the fiber-reinforced cementitious composite core and the surrounding steel pipes was modeled based on the inter-layer shear strength test experiments conducted on the sandwich pipe specimens. The parametric studies were carried out to evaluate the influence of geometry parameters and steel grade on the buckling response and ultimate pressure capacity. Furthermore, 768 FE models of sandwich pipes covering a wide range of practical design configurations were rapidly constructed and analyzed using FE software package ABAQUS with the help of programming language Python. Finally, a simplified equation for predicting the pressure capacity of sandwich pipes within the scope of this study was proposed using dimensional analysis combined with singular value decomposition methodology.

Mechanical Properties of Vanadium Microalloyed High-Strength ASTM A694 Forgings

2017 ◽  
Author(s):  
K. C. Baker ◽  
R. M. Thompson ◽  
T. C. Gorrell
Keyword(s):  
Chemical Composition ◽  
Oil And Gas ◽  
Charpy Impact ◽  
High Strength ◽  
Oil And Gas Industry ◽  
Heat Treating ◽  
Manganese Steel ◽  
Material Test ◽  
Shear Area ◽  
The Impact

Recent upstream oil and gas industry experience has raised attention to substandard properties with high strength carbon steel forgings manufactured to the requirements of ASTM A694 and MSS-SP-44. As part of an internal investigation into quality of commodity pipeline flanges, three flanges certified as ASTM A694 grade F60 to F70, were purchased off-the-shelf from three different manufacturers for microstructural and mechanical property investigation. All three flanges were supplied with material test certificates indicating acceptable material properties. Tensile and Charpy impact specimens were extracted from various locations and orientations in each flange. All three flanges failed to meet yield strength requirements for the specified grade. The impact energy and shear area values were well below those reported on the material test certificates. The discrepancy between the sacrificial testing results and the material test certificates is attributed to the use of separately forged test blocks for quality testing instead of integral prolongations or a sacrificial production part, which is permitted by ASTM A694 and MSS-SP-44. Further investigation was made into the chemical composition and heat treating practices. The chemical composition can be characterized as high strength, low alloy steel (HSLA) by virtue of 0.05–0.08 wt. pct. vanadium added to a carbon-manganese steel with CE(IIW) ranging from 0.43 to 0.45. Advanced microscopy showed that the morphology of the vanadium precipitates was inadequate as a strengthener and deleterious to Charpy impact properties for the size of the flanges and the heat treatment practices applied.

scholarly journals The Assessment of the Impact of Sanctions on Russia for Oil & Gas Industry and Defence Industry Complex of Russia

2019 ◽  
Vol 12 (3) ◽  
pp. 46-57 ◽  
Author(s):  
S. V. Kazantsev
Keyword(s):  
Oil And Gas ◽  
Negative Impact ◽  
Financial Economic ◽  
Gas Production ◽  
Gas Industry ◽  
Oil And Gas Production ◽  
Foreign Earnings ◽  
Defence Industry ◽  
Wide Range ◽  
The Impact

The article presents the results of the author’s research of the impact of a wide range of restrictions and prohibitions applied to theRussian Federation, used by a number of countries for their geopolitical purposes and as a means of competition. The object of study was the impact of anti-Russian sanctions on the development of Oil & Gas industry and defence industry complex ofRussiain 2014–2016. The purpose of the analysis was to assess the impact of sanctions on the volume of oil and gas production, the dynamics of foreign earnings from the export of oil and gas, and of foreign earnings from the sale abroad of military and civilian products of the Russian defence industry complex (DIC). As the research method, the author used the economic analysis of the time series of statistical data presented in open statistics and literature. The author showed that some countries use the anti-Russian sanctions as a means of political, financial, economic, scientific, and technological struggle with the leadership ofRussiaand Russian economic entities. It is noteworthy that their introduction in 2014 coincided with the readiness of theUSto export gas and oil, which required a niche in the international energy market. The imposed sanctions have affected the volume of oil production inRussia, which was one of the factors of reduction of foreign earnings from the country’s oil and gas exports. However, the Russian defence industry complex has relatively well experienced the negative impact of sanctions and other non-market instruments of competition

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